JPS59126078A - Temperature control device for glow plug - Google Patents

Temperature control device for glow plug

Info

Publication number
JPS59126078A
JPS59126078A JP137683A JP137683A JPS59126078A JP S59126078 A JPS59126078 A JP S59126078A JP 137683 A JP137683 A JP 137683A JP 137683 A JP137683 A JP 137683A JP S59126078 A JPS59126078 A JP S59126078A
Authority
JP
Japan
Prior art keywords
glow plug
charging
voltage
timer
capacitor
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.)
Granted
Application number
JP137683A
Other languages
Japanese (ja)
Other versions
JPH0235155B2 (en
Inventor
Nobuyuki Naruse
成瀬　信幸
Tsuyoshi Kamiya
剛志 神谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Tokushu Togyo KK
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
Nippon Tokushu Togyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NGK Spark Plug Co Ltd, Nippon Tokushu Togyo KK filed Critical NGK Spark Plug Co Ltd
Priority to JP137683A priority Critical patent/JPS59126078A/en
Publication of JPS59126078A publication Critical patent/JPS59126078A/en
Publication of JPH0235155B2 publication Critical patent/JPH0235155B2/ja
Granted legal-status Critical Current

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)
  • Control Of Temperature (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

PURPOSE:To prevent a heating body from melting and cutting surely and permit the prompt temperature rise thereof by a method wherein a temperature difference between the surface temperature of the glow plug and the temperature of the heating body due to the variation of an electric source voltage as well as the elongation or shortening of a conducting time for the glow plug are permitted to maintain them in proper. CONSTITUTION:The contact 41 of first relay 4 for supplying a large current is inserted into a conducting circuit for the glow plug 3 while the relay 4 is controlled by first timer 6 changing the output time constant thereof in accordance with the input voltage thereof. A current, limited through a current limiting resistor 52, can be supplied to the glow plug 3 through the contact 51 of the second relay 5. The first timer 6 consists of first charging circuit L1, concerning the charging of a capacitor C1 for determining the time constant at all times, the second charging circuit L2, charging the capacitor C1 during a time in which the charging voltage of the capacitor C1 is not satisfying a value determined so as to become a substantially constant ratio with respect to a glow plug impressing voltage Vg, and the third charging circuit L3, charging the capacitor 1 when said voltage Vg is higher than a given value.

Description

【発明の詳細な説明】 本発明は内燃機関に装着されるシースグロープラグの温
度制ｔｉｌ＋装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature control device for a sheathed glow plug installed in an internal combustion engine.

グロープラグへ印加されている電圧を検出してグロープ
ラグへの通電時間を制御する方式のグロープラグの温度
制御装置においては、エンジンの始動に必要なグロープ
ラグのシーズチューブ表面温度と、シーズチューブ内に
収納されている発熱体との温度差が、グロープラグへ印
加される電圧がグロープラグの定格電圧に比べて高くな
るほど大きくなる現象が生じる。すなわちグロープラグ
へ大電流を供給して昇温速度を大きくし、グロープラグ
のシーズチューブ表面をエンジンの始１Ｊに必要な温度
（たとえば９００℃）に急臂渇させるいわゆる急速加熱
型のグロープラグにおいては、電源電圧が高い使用条件
のとき、表面温度と発熱体温度との温度差が著しく大き
くなり、グロープラグへの通電時間を単純に到達表面温
度一定の条件を念頭においてグロープラグへの印加電圧
に対して変化させるだけでは発熱体が過昇温し溶断する
故障が発生しやすい。A glow plug temperature control device that detects the voltage applied to the glow plug and controls the energization time to the glow plug detects the glow plug's sheath tube surface temperature and the internal sheath tube temperature required to start the engine. A phenomenon occurs in which the temperature difference between the glow plug and the heating element housed in the glow plug increases as the voltage applied to the glow plug becomes higher than the rated voltage of the glow plug. In other words, in a so-called rapid heating type glow plug, a large current is supplied to the glow plug to increase the rate of temperature rise, and the surface of the sheath tube of the glow plug is rapidly brought to the temperature required for the first 1 J of the engine (for example, 900 degrees Celsius). When the power supply voltage is high, the temperature difference between the surface temperature and the heating element temperature becomes significantly large. If you simply change the temperature, the temperature of the heating element will rise too much and it will easily melt down.

本発明の目的は、電源電圧の変化ににるグロープラグの
表面温度と発熱体温度との温度差と、グ１」−プラグへ
の通電時間の伸縮とが適止に対応でき、発熱体の溶断が
確実に防止でき、しかも速やかに４温できるグロープラ
グの温度制ｔｆＩＩ装置の提供にある。An object of the present invention is to appropriately cope with the temperature difference between the surface temperature of the glow plug and the temperature of the heating element due to changes in the power supply voltage, and the expansion and contraction of the energization time to the plug. To provide a temperature control tfII device for a glow plug that can reliably prevent melting and can quickly be heated to four temperatures.

本発明は入ツノ電圧に応じて出力時定数が変化づる第１
のタイマと、グロープラグへの通電回路に設けられ前記
第１のタイマの出力で開閉される第１のリレーとを備え
たグロープラグの温度制御装置において、 第１のタイマは時限決定のためのコンデンサへの充電回
路として、常時通電を行う第１の充電回路と、上記コン
デンサの充電々圧がグロープラク印加電圧に対してほぼ
一定比になるように決める愉に満たない間充電が行われ
るようにした第２の充電回路と、ツェナーダイオードを
含みグローブ氏 ラグの印ＩＫＩ電淀が一定値を越えて人きいときに充電
が行われるようにした第３の充電回路とからなることを
構成とする。The present invention is based on the first
A glow plug temperature control device comprising a timer and a first relay that is provided in a current supply circuit to the glow plug and is opened and closed by the output of the first timer, the first timer is for determining a time limit. As a charging circuit for the capacitor, there is a first charging circuit that is constantly energized, and a charging circuit that performs charging for a period of time determined such that the charging voltage of the capacitor is approximately a constant ratio to the voltage applied to the glow plaque. and a third charging circuit that includes a Zener diode and is configured to perform charging when the IKI voltage level marked by Mr. Grove's lug exceeds a certain value. .

つきに本発明を図に示す実施例に基づき説明する。First, the present invention will be explained based on embodiments shown in the drawings.

１はバッテリ、２はキースイッチでありＯＦＦ端子２１
、予熱端子２２、スタータモータ作動端子２３を有する
。３はグ［１−プラグ、４はグロープラグ３への通電回
路に挿入された大電流供給用の第１のリレー、４１はそ
の常開接点、５はグロープラグ３への電流制限用抵抗５
２を介じて制限された電流を供給づる第２のリレー、５
１はその常開接点、６はリレー４を制御するための第１
のタイマ、７はスタータモータへの通電時間中グロープ
ラグ電圧に応じてリレー４を断続的に開閉させるための
パルスを出力するチョッピングタイマ、８は始動時期表
示用タイマ、８１は該タイマにより点灯されるグローラ
ンプ、９はエンジンの自刃運転を検出する完爆検出回路
、１０はリレー５を制御し、ｍ記後のグロープラグ３の
保温およびアフターグローを行うだめの第２のタイマ、
７１は第１のタイマ６とチョッピングタイマ７との出力
を入力とし前記リレー４にオア（ＯＲ）出力を生じるＡ
ア回路である。1 is the battery, 2 is the key switch, and the OFF terminal 21
, a preheating terminal 22, and a starter motor operating terminal 23. 3 is the plug [1-plug, 4 is the first relay for supplying large current inserted in the energizing circuit to the glow plug 3, 41 is its normally open contact, 5 is the resistor 5 for limiting the current to the glow plug 3
a second relay for supplying limited current through 2, 5;
1 is its normally open contact, and 6 is the first one for controlling relay 4.
7 is a chopping timer that outputs a pulse to intermittently open and close the relay 4 according to the glow plug voltage during the time when the starter motor is energized, 8 is a timer for displaying the start time, and 81 is a timer that is lit by the timer. a glow lamp 9; a complete explosion detection circuit 9 for detecting self-operation of the engine; 10 a second timer for controlling the relay 5 and performing afterglow and keeping the glow plug 3 warm after the m-th mark;
71 is an A that receives the outputs of the first timer 6 and chopping timer 7 and generates an OR output to the relay 4;
It is a circuit.

Ｃ１〜Ｃ４コンデンザ、Ｒ１−［り１０は抵抗、Ｄ１〜
Ｄ３はダイオ−１〜、ＺＤｉ〜ＺＤ３はツェナーダイオ
ードを示づ。C1~C4 capacitor, R1-[R10 is resistor, D1~
D3 indicates diodes 1 to 1, and ZDi to ZD3 indicate Zener diodes.

第１のタイマ６は、比較器６０ど、時定数決定のための
］コンデンサ−Ｃ１、定電圧源とコンデンサＣ１とをタ
イＡ−トＤ１、抵抗Ｒ５を介し−（接続しコンデンサ−
０１への充電に常時関与づる第１の充電回路１−１、上
記］ンデン４ノＣＩの充電々圧がグロープラグ印加電圧
ＶＱに対してほぼ一定比になるように決が）る値に満た
ない間充電が行われるようにダイオードＤ２、抵抗Ｒ３
を介してコンテン４ノＣ１を充電する第２の充電回路Ｌ
２、タイオードＤ２と定電圧タイオードＺＤ２　、ＺＤ
３を介することにＪ：リグローブラグ印加電圧Ｖｇが一
定値を越えて大きいときにコンデンサＣ１に充電する第
３の充電回路［３を有し、充電回路Ｌ１からの充電電流
１１、充電回路Ｌ２からの充電電流１２、充電回路Ｌ３
からの充電電流ｉ３にＪ：り充電される。The first timer 6 includes a comparator 60, a capacitor C1 for determining a time constant, a constant voltage source, and a capacitor C1 connected through a tie D1 and a resistor R5.
The first charging circuit 1-1, which is always involved in charging the 01, satisfies a value such that the charging voltage of the above-mentioned 4 CI is approximately a constant ratio to the glow plug applied voltage VQ. diode D2 and resistor R3 so that charging is performed during
A second charging circuit L that charges the content 4 C1 via
2. Diode D2 and constant voltage diode ZD2, ZD
A third charging circuit [3 that charges the capacitor C1 when the applied voltage Vg is larger than a certain value] includes a charging current 11 from the charging circuit L1 and a charging circuit L2. Charging current 12 from charging circuit L3
J: is charged by the charging current i3 from .

このコンデンサＣ１への充電は、グロープラグへの印加
電圧ＶＱが設定値以下のどき、充電回ＶｆｌＬ１と１２
とによりなされ、上記設定値以上では充電回路「３が更
に組合わされ充電回路Ｌ１、Ｌ２、し３の全文か働くよ
うにされるのである。This capacitor C1 is charged when the voltage VQ applied to the glow plug is below the set value, charging times VflL1 and 12.
When the above set value is exceeded, the charging circuit ``3'' is further combined and all of the charging circuits L1, L2, and L3 are activated.

つきに上記第１のタイマの作用を説明覆る。First, the operation of the first timer will be explained.

グロープラグ３の端子への印加電圧Ｖりが低電圧時（た
とえばＶ（１＜１１ポル１〜）には、充電回路＋１　と
［２の充電電流１１と１２のみでコンデン→ｆＣ１を充
電し、電圧Ｖ（＋が高くなるに従い、１で９．７Ｄ２．
２Ｄ３を直列した充電回路Ｌ３による充電電流ｉ３で補
正する。この３つの充電回路は、グロープラグ端子への
印加電圧をＶ（１、Ｃ１の充電電圧をＶＣ１比較器６０
の基準電圧をＶｉ、タイオ−ドＤ２の降服電圧をＶｆ、
ツエダイオード７Ｄ２　、ＺＤ３の降服電圧をＶｚとす
るとつぎのように作用する。When the voltage applied to the terminal of the glow plug 3 is low (for example, V (1<11pol1~), the capacitor → fC1 is charged with only the charging currents 11 and 12 of the charging circuit +1 and [2, As the voltage V(+ increases, it becomes 9.7D2 at 1.
2D3 is corrected with a charging current i3 from a charging circuit L3 connected in series. These three charging circuits set the voltage applied to the glow plug terminal to V(1, and set the charging voltage of C1 to the VC1 comparator 60.
The reference voltage of is Vi, the breakdown voltage of diode D2 is Vf,
Letting the breakdown voltage of the zediodes 7D2 and ZD3 be Vz, the operation will be as follows.

ａ）Ｖｑが高い場合　　（たとえば’ＶＯン１１ボルト
） Ｖｇ　＞Ｖｃ　＋Ｖｆ　十Ｖｚ　　（Ｖｚ　＞Ｖｃ　＋
Ｖｆ　）ｂ）Ｖｇが中程度の場合　　（たとえば１１ボ
ルト＞Ｖｇ＞８ボルト・） Ｖｇ　＋Ｖｆ　＋Ｖｚ≧Ｖ（１＞　（Ｒ３４−Ｒ４）　
／Ｒ３（ＶＣ＋Ｖｆ　） ｃ）Ｖｑが低い場合　　〈たとえば８ボルト〉■！１）
Ｖ（１≦（Ｒ３−＋−Ｒ４）　／Ｒ３（Ｖｃ　十Ｖｆ　
）ａ）、１１）、Ｃ）の各場合における充電電圧特性線
を第２図のグラフにａ、ｂ、ｃて示ｔ、、ｃ１への充電
電圧ＶＣを決定する上記（１）〜（３）式はＶｃが基準
電圧Ｖｉの近傍にあるときの充電特性であり、実際には
、回路Ｌ１が作用Ｊる場合には、Ｖｃ　＝０より充電が
開始されるので、ｖｇ、Ｖｆ　、　Ｖｃ　、　Ｖ　２の
関係より第２図のように充電されていく。よって電源電
圧ｖＱが高い場合には、第２図に示す特性曲線ａの如く
変極点Ｐを有するようにされ当初は充電電流１１．１２
、ｉ３により急速に初期充電し、つぎに１１とｉ３とで
充電されて比較器６０の反転時間すなわち第１のタイマ
６０の通電時間が決められる。なお各曲線ａ　、　ｔ＋
　、　Ｃの変極点Ｓは充電ＩＢＥＶｃ　＝Ｖ２−Ｖｆ　
＝ＶｇＸＲ３／（Ｒ３＋Ｒ４）−Ｖｆの点である。a) When Vq is high (for example 'VO - 11 volts) Vg > Vc + Vf 10 Vz (Vz > Vc +
Vf ) b) When Vg is medium (for example, 11 volts > Vg > 8 volts) Vg +Vf +Vz≧V(1> (R34-R4)
/R3 (VC+Vf) c) When Vq is low (e.g. 8 volts)■! 1)
V(1≦(R3-+-R4) /R3(Vc +Vf
) Charging voltage characteristic lines in each case of a), 11), and C) are shown as a, b, and c in the graph of FIG. ) is the charging characteristic when Vc is near the reference voltage Vi, and in reality, when the circuit L1 acts, charging starts from Vc = 0, so vg, Vf, Vc, Due to the relationship of V2, it is charged as shown in Figure 2. Therefore, when the power supply voltage vQ is high, the characteristic curve a shown in FIG. 2 has an inflection point P, and the charging current is initially 11.12.
, i3, and then charged by 11 and i3 to determine the inversion time of the comparator 60, that is, the energization time of the first timer 60. Note that each curve a, t+
, the inflection point S of C is charging IBEVc = V2 - Vf
=VgXR3/(R3+R4)-Vf.

Ｃ１へのん電カーブは各電圧条件で第２図のようになり
、これら条件設定Ｊ：り第１図の第１のタイマ６の出力
によるグロープラグ３への通電時間は計紳式より求めら
れ第３図に実施例の実験値Ｏ印と計算＋１　（線）とを
図示する。上記変極点Ｐの生成に伴う通電時間−印加ミ
ル特性曲線上の変曲点Ｑの生成位置はツェナーダイオー
ド（ＺＤ２、ＺＤ３）による降服電圧値Ｖｚを適当に選
ぶことでグロープラグ特１１に応じて自由に設定するこ
とができ、上記通電時間−印加電圧特性曲線の変曲点Ｑ
より電圧の小さい側はグロープラグの表面温度をほぼ一
定とする条件を、大きい側は内部発熱　　体の温度をほ
ぼｍｉ線温湿度近い一定温度と覆る条件を満すように決
めることにより有利な通電時間制御を行うことができる
。The energization curve to C1 is as shown in Fig. 2 under each voltage condition, and the energization time to the glow plug 3 according to the output of the first timer 6 in Fig. 1 is calculated using the timing formula. FIG. 3 shows the experimental value O mark and the calculated +1 (line) of the example. The generation position of the inflection point Q on the energization time-applied mill characteristic curve accompanying the generation of the above-mentioned inflection point P can be determined according to the glow plug special 11 by appropriately selecting the breakdown voltage value Vz of the Zener diodes (ZD2, ZD3). The inflection point Q of the above energization time-applied voltage characteristic curve can be set freely.
The smaller voltage side satisfies the condition of keeping the surface temperature of the glow plug almost constant, and the larger voltage side satisfies the condition of keeping the temperature of the internal heating element at a constant temperature close to the mi-line temperature and humidity. Time control can be performed.

以上の如く本発明のグロープラグの温度制御装置は入力
電圧に応じて出力時定数が変化りる第１のタイマと、グ
ロープラグへの通電回路に設＋Ｊられ前記第１のタイマ
の出力でＯＮ、ＯＦＦされる第１のリレーとを備えたグ
［］−プラグの温度制御装置にＪ３いて、 第１のタイマは時限決定のためのコンアン１ノへの充電
回路として、常時通電を行う第１の充電回路と、上記コ
ンデンサの充電々圧がグロープラク印加電圧に対してほ
ぼ一定比になるように決める値に満たない間充電が行わ
れるようにした第２の充電回路と、ツェナーダイオード
を含みグロープラグの印加型々が一定値を越えて大きい
ときに充電が行われるようにした第３の充電回路とから
なるので、電源電圧の変化によりグロープラグへの通電
時間が適正に増減でき、発熱体の溶断が確実に防止して
しかも急速な予熱４渇がてさる。As described above, the glow plug temperature control device of the present invention includes a first timer whose output time constant changes depending on the input voltage, and a glow plug energizing circuit, which is turned ON by the output of the first timer. , and a first relay that is turned OFF, the first timer is used as a charging circuit for the controller 1 to determine the time limit, and the first timer is connected to the first relay that is always energized. a second charging circuit that performs charging while the charging voltage of the capacitor is less than a value determined so that the voltage applied to the glow plaque is approximately a constant ratio to the voltage applied to the glow plaque; Since it consists of a third charging circuit that performs charging when the voltage applied to the plug exceeds a certain value, the energization time to the glow plug can be appropriately increased or decreased depending on changes in the power supply voltage, and the heating element It reliably prevents melting and also allows rapid preheating.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明のグ［１−プラグの温度制御装置を示づ
ブロック図、第２図はコンデンサの充電特性を示づグラ
フ、第３図は第１のタイマによるグロープラグの通電時
間とグロープラグの端子電圧との関係を示すグラフであ
る。 図中　４・・・第１のリレー　６・・・第１のタイマＣ
１・・・第１のタイマの時定数決定のためのコンデンサ
　Ｌｌ・・・第１の充電回路　Ｌ２・・・第２の充電回
路　Ｌ３・・・！′！３の充電回路 第１図 第２図 第３図 手続補正書 昭和５８年２月ｌＺ日 特許庁長官　　　Ｗ！７ １、事件の表示　　昭和５８年特許願第１３７６号２、
発明の名称 グロープラグの）島度制御装置 ３、補正をする者 事件との関係　特許出願人 住　所　名古屋市瑞穂区高辻町１４番１８号氏　名　　
日本特殊陶業株式会社 （４５４）代表者　小川修法 ４、代理人〒４６５電話０５２−７７３−２４４９明細
■）全文おＪ：び図面 ６、補正の内容　　別紙の通り ；／ｌ、− ＼　　４゛；ン　　　　　、　　、ノ。 明細書 １、発明の名称 グロープラグの温度制御装置 ２、特許請求の範囲 １）入力電圧に応じて出力時定数が変化する第１のタイ
マと、グロープラグへの通電回路に設けられ前記第１の
タイマの出力で開閉される第１のリレーとを備えたグロ
ープラグの温度制御装置において、 第１のタイマは時限決定のためのコンデンサへつ充電回
路として、常時通電を行う第１の充電同名と、上記コン
デンサの充電々圧がグロープラグ］Ｊ加電圧に対してほ
ぼ一定比になるように決める値に満たない間充電が行わ
れるようにした第２の充電回路と、ツェナーダイオード
を含みグロープラグの印加電圧が一定値を越えて大きい
ときに充電が行われるようにした第３の充電回路とから
なることを特徴とするグロープラグの温度制御装置。 ３、発明の詳細な説明 本発明は内燃機関に装着されるシーズグロープラグの温
度制御装置に関する。 グロープラグへ印加されている電圧を検出してグロープ
ラグへの通電時間を制御する方式のグロープラグの温度
制御装置においては、エンジンの始動に必要なグロープ
ラグのシーズチューブ表面温度と、シーズチューブ内に
収納されている発熱体との温度差が、グロープラグへ印
加される電圧がグロープラグの定格電圧に比べて高くな
る番よと大きくなる現象が生じる。すなわちグロープラ
グへ大電流を供給して４温速度を大きくし、グロープラ
グのシーズチューブ表面をエンジンの始動に必要な温度
（たとえば９００℃）に急昇渇させるいわゆる急速加熱
型のグロープラグにおいては、電源電圧が高い使用条件
のとき、表面温度と発熱体温度との温度差が著しく大き
くなり、グロープラグへの通電時間を単純に到達表面温
度一定の条件を念頭においてグロープラグへの印加電圧
に対して変化させるだけでは発熱体が過昇温し溶断、す
る故障が発生しやすい。 本発明の目的は、電源電圧の変化によるグロープラグの
表面温度と発熱体温度との温度差と、グロープラグへの
通電時間の伸縮とが適正に対応でき、発熱体の溶断が確
実に防止でき、しかも速やかに昇温できるグロープラグ
の温度制御装置の掟倶にある。 本発明は入力電圧に応じて出力時定数が変化する第１の
タイマと、グロープラグへの通電回路に設けられ前記第
１のタイマの出力で開閉される第１のリレーとを備えた
グロープラグの温度制御装置において、 第１のタイマは時限決定のためのコンデンサへの充電回
路として、常時通電を行う第１の充電回路と、上記コン
デンサの充電々圧がグロープラク印加電圧に対してほぼ
一定比になるように決める値に満たない間充電が行われ
るようにした第２の充電回路と、ツェナーダイオードを
含みグロープラグの印加電圧が一定値を越えて大きいと
きに充電が行われるようにした第３の充電回路とからな
ることを構成とする。 つぎに本発明を図に示す実施例に基づき説明づる。 １はバッテリ、２はキースイッチでありＯＦＦ端子２１
、予熱端子２２、スタータモータ作動端子２３を有する
。３はグロープラグ、４はグロープラグ３への通電回路
に挿入された大電流供給用の第１のリレー、４１はイの
常開接点、５はグロープラグ３への電流制限用抵抗５２
を介して制限された電流を供給する第２のリレー、５１
はその常開接点、６はリレー４を制御するための第１の
タイン、７はスタータモータへの通電時間中グロープラ
グ電圧に応じてリレー４を断続的に開閉させるためのパ
ルスを出力するチョッピングタイマ、８は始動時期表示
用タイマ、８１は該タイマにより点灯されるグローラン
プ、９はエンジンの自刃運転を検出する完爆検出回路、
１０はリレー５を制御し、昇温後のグロープラグ３の保
温およびアフターグローを行うための第２のタイマ、７
１は第１のタイマ６とチョッピングタイマ７との出力を
入力とし前記リレー４にオア（ＯＲ）出力を生じるオア
回路である。 ０１〜Ｃ４コンデンサ、Ｒ１〜ＲＩＯは抵抗、Ｄ１〜Ｄ
３はダイオード、ＺＤ１〜ＺＤ３はツェナータイオード
を示す。 第１のタイマ６は、比較器６０と、時定数決定のための
コンデンサＣ１、定電圧源とコンデンサＣ１とをダイオ
ードＤ１、抵抗Ｒ５を介−して接続しコンデンサＣ１へ
の充電に常時関与づる第１の充電回路Ｌ１、上記コンデ
ンサＣ１の充電々圧がグロープラク印加電圧Ｖ（＋に対
してほぼ一定比になるように決める値に満たない間充電
が行われるようにダイオードＤ２、抵抗Ｒ３を介してコ
ンデンサＣ１を充電する第２の充電回路Ｌ２、ダイオー
ドＤ２と定電圧ダイオードＺＤ２　、ＺＤ３を介するこ
とによりグロープラク印加電圧■ｇが一定値を越えて大
きいときにコンデンサＣ１に充電する第３の充電回路Ｌ
３を有し、充電回路Ｌ１からの充電電流１１、充電回路
Ｌ２からの充電電流１２、充電回路Ｌ３からの充電電流
ｉ３により充電される。 このコンデンサＣ１への充電は、グロープラグへの印加
電圧Ｖｃ＋が設定値以下のとき、充電回路Ｌ１とＬ２と
によりなされ、上記設定値以上では充電回路Ｌ３が更に
組合わされ充電回路Ｌｌ　、Ｌ２、Ｌ３の全てが働くよ
うにされるのである。 つき゛に上記第１のタイマの作用を説明Ｊ−る。 グロープラグ３の端子への印加電圧Ｖ（＋が低電圧時（
たとえばＶ（＋＜１１ボルト）には、充電回路Ｌ１と１
２の充電電流１１と１２のみでコンデンサＣ１を充電し
、電圧Ｖａが高くなるに従い、Ｒ９、ＺＤ２　、ＺＤ３
を直列した充電回路Ｌ３による充電電流ｉ３で補正する
。この３つの充電回路は、グロープラグ端子への印加電
圧をｖｇ、Ｃ１の充電電圧をＶｃ、比較器６００基準電
圧をＶｉ、ダイオードＤ２の降服電圧を■［、ツエダイ
オードＺＤ２、ｚＤ３の降服電圧をＶＺとするとつぎの
ように作用する。 ａ）Ｖａが高い場合　　（たとえばＶ（＋　＞１１ポル
１〜） Ｍ　：＞Ｖｃ　＋Ｖｆ　＋Ｖｚ　　（Ｖｚ　＞Ｖｃ　＋
Ｖｆ　）Ｖｃ　＝　１／ＣＩ　Ｊ（ｉｌ＋ｉ２＋ｉ３）
　ｄｊ・（１）ｂ）Ｖｇが中程度の場合　　（たとえば
１１ボルト＞、　Ｖ　ｇ　＞　ｐ、ボルト） ■ｇ＋Ｖｆ　＋Ｖｚ　≧ｖｇ＞　（Ｒ３＋Ｒ４）／Ｒ３
（Ｖｃ　＋Ｖｆ　） Ｃ）Ｖｇが低い場合　　（たとえば８ボルト〉Ｖｇ）Ｖ
ｑ≦（’Ｒ３＋Ｒ４）／Ｒ３（Ｖｃ　＋Ｖｆ　）Ｖｃ　
＝　１／ＣＩ　Ｊｉｌｄｔ・・・（３）ａ）、ｂ）、Ｃ
）の各場合における充電電圧特性線を第２図のグラフに
８１．６＋、Ｃ２で示す。Ｃ１への充電電圧Ｖｃを決定
する上記（１）〜（３）式はＶＣが基準電圧Ｖｉの通例
にあるときの充電特性であり、実際には、回路Ｌ１が作
用する場合には、Ｖｃ　＝０より充電が開始されるので
、Ｖ（＋、Ｖｆ　、Ｖｃ　、ＶＺの関係より第２図のよ
うに充電されていく。よって電源電圧Ｖｇが高い場合に
は、第２図に示す特性曲線ａの如く変極点Ｐを有するよ
うにされ当初は充電電流１１．１２、ｉ３により魚速に
初期充電し、つぎに１１と１２とで充電されて比較器６
０の反転時間すなわち第１のタイマ６０の通電時間が決
められる。なお各曲線ａ、ｌ）、Ｃの変極点Ｓは充電々
圧Ｖｃ　＝Ｖ２−Ｖｆ　＝ＶｇｘＲ３／（Ｒ３→−Ｒ４
）−Ｖｆの点である。 Ｃ１への充電カーブは各電圧条件で第２図のようになり
、これら条件設定より第１図の第１のタイマ６の出ツノ
によるグロープラグ３への通電時間は針線式より求めら
れ第３図に実施例の実験値Ｏ印と計界値（線）とを図示
する。上記変極点Ｐの生成に伴う通電時間−印加電圧特
性曲線上の変曲点Ｑの生成位置はツェナーダイオード（
ＺＤ２、ＺＤ３　）による降服電圧値Ｖｚを適当に選ぶ
ことでグロープラグ特性に応じ−Ｃ自由に設定すること
ができ、上記通電時間−印加電圧特性曲線の変曲点Ｑよ
り電圧の小さい側はグロープラグの表面温度をほぼ一定
とする条件を、大きい側は内部発熱体の温度をほぼ断線
湿度に近い一定温度とＪる条件を満すように決めること
により有利な通電時間制御を行うことができる。 以上の如く本発明のグロープラグの温度制御装置は入力
電圧に応じて出力時定数が変化４る第１のタイマと、グ
ロープラグへの通電回路に設けられ前記第１のタイマの
出力でＯＮ、ＯＦＦされる第１のリレーとを備えたグロ
ープラグの温度制御装置において、 第１のタイマは萄限決定のためのコンデンサへの充電回
路として、常時通電を行う第１の充電回路と、上記コン
デンサの充電々圧がグロープラク印加電圧に対してほぼ
一定比になるように決める伯に満たない間充電が行われ
るようにした第２の充電回路と、ツェナーダイオードを
含みグローブラグの印加電圧が一定値を越えて大きいと
きに充電が行われるようにした第３の充電回路とからな
るので、電源電圧の変化によりグロープラグへの通電時
間が適正に増減でき、発熱体の溶断が確実に防止してし
かも急速な予熱昇温ができる。 ４、図面の簡単な説明 第１図は本発明のグロープラグの温度制ｉＩｌ装置を示
すブロック図、第２図はコンデンサの充電特性を示Ｊグ
ラフ、第３図は第１のタイマによるグロープラグの通電
時間とグロープラグの端子電圧どの関係を示すグラフで
ある。 図中　４・・・第１のリレー　６・・・第１のタイマＣ
１・・・第１のタイマの時定数決定のためのコンデンサ
　し１・・・第１の充電回路　Ｌ２・・・第２の充電回
路　Ｌ３・・・第３の充電回路 第１図 ４Ｆ１１− 第２図 第３図 グループラグ’４３−へっ叩Ｘｌｌ［ｌ電坦■９Fig. 1 is a block diagram showing the temperature control device for the glow plug of the present invention, Fig. 2 is a graph showing the charging characteristics of the capacitor, and Fig. 3 is the energization time of the glow plug by the first timer. It is a graph showing the relationship with the terminal voltage of the glow plug. In the diagram 4...First relay 6...First timer C
1... Capacitor for determining the time constant of the first timer Ll... First charging circuit L2... Second charging circuit L3...! ′! Charging circuit of 3 Figure 1 Figure 2 Figure 3 Procedural amendment February 1980 lZ Commissioner of the Patent Office W! 7 1. Indication of the incident Patent Application No. 1376 of 1982 2.
Name of the invention: Island control device 3 (for glow plugs), Relationship to the case of the person making the amendment Patent applicant address: 14-18 Takatsuji-cho, Mizuho-ku, Nagoya Name:
NGK SPARK PLUG Co., Ltd. (454) Representative: Shuho Ogawa 4, Agent: 465 Telephone: 052-773-2449 Specifications ■) Full text J: and Drawing 6, Contents of amendments As attached; /l, - ＼ 4゛; N,,,no. Description 1, Title of Invention Glow Plug Temperature Control Device 2, Claims 1) A first timer whose output time constant changes according to input voltage; In a glow plug temperature control device equipped with a first relay that is opened and closed by the output of a timer, the first timer functions as a charging circuit for a capacitor for determining a time limit, and a first charging relay that is always energized. and a second charging circuit that performs charging while the charging voltage of the capacitor is less than a value determined so that it is approximately a constant ratio to the applied voltage of the glow plug, and a glow plug that includes a Zener diode. A temperature control device for a glow plug, comprising a third charging circuit configured to perform charging when the voltage applied to the plug exceeds a certain value. 3. Detailed Description of the Invention The present invention relates to a temperature control device for a sheathed glow plug installed in an internal combustion engine. A glow plug temperature control device that detects the voltage applied to the glow plug and controls the energization time to the glow plug detects the glow plug's sheath tube surface temperature and the internal sheath tube temperature required to start the engine. A phenomenon occurs in which the temperature difference between the glow plug and the heating element housed in the glow plug becomes larger as the voltage applied to the glow plug becomes higher than the rated voltage of the glow plug. In other words, in so-called rapid heating type glow plugs, a large current is supplied to the glow plug to increase the four-temperature speed, and the surface of the glow plug's sheath tube is rapidly raised to the temperature required for starting the engine (for example, 900 degrees Celsius). When the power supply voltage is high, the temperature difference between the surface temperature and the heating element temperature becomes significantly large. On the other hand, if you simply change the temperature, the heating element will overheat and melt, which is likely to cause a malfunction. An object of the present invention is to appropriately cope with the temperature difference between the surface temperature of the glow plug and the temperature of the heating element due to changes in power supply voltage, and the expansion and contraction of the energization time to the glow plug, and to reliably prevent melting of the heating element. Moreover, it is a rule of the glow plug temperature control device that the temperature can be raised quickly. The present invention provides a glow plug that includes a first timer whose output time constant changes depending on the input voltage, and a first relay that is provided in a circuit that supplies electricity to the glow plug and is opened and closed by the output of the first timer. In the temperature control device, the first timer serves as a charging circuit for the capacitor for determining the time limit, and the first charging circuit is always energized, and the charging voltage of the capacitor is at a substantially constant ratio to the voltage applied to the glow plaque. The second charging circuit includes a Zener diode and is configured to perform charging while the voltage applied to the glow plug exceeds a certain value. The configuration consists of three charging circuits. Next, the present invention will be explained based on embodiments shown in the drawings. 1 is the battery, 2 is the key switch, and the OFF terminal 21
, a preheating terminal 22, and a starter motor operating terminal 23. 3 is a glow plug, 4 is a first relay for supplying a large current inserted in the energizing circuit to the glow plug 3, 41 is a normally open contact of A, and 5 is a resistor 52 for limiting the current to the glow plug 3.
a second relay, 51, providing limited current through the
is its normally open contact, 6 is the first tine for controlling the relay 4, and 7 is a chopper that outputs pulses to intermittently open and close the relay 4 according to the glow plug voltage during the time when the starter motor is energized. A timer 8 is a timer for displaying the start time, 81 is a glow lamp that is lit by the timer, 9 is a complete explosion detection circuit that detects self-driving operation of the engine,
10 is a second timer for controlling the relay 5 and performing afterglow and keeping the glow plug 3 warm after the temperature has increased;
Reference numeral 1 denotes an OR circuit which receives the outputs of the first timer 6 and chopping timer 7 and generates an OR output to the relay 4. 01~C4 capacitor, R1~RIO are resistors, D1~D
3 represents a diode, and ZD1 to ZD3 represent Zener diodes. The first timer 6 connects a comparator 60, a capacitor C1 for determining a time constant, a constant voltage source, and the capacitor C1 via a diode D1 and a resistor R5, and is always involved in charging the capacitor C1. The first charging circuit L1 connects the capacitor C1 via a diode D2 and a resistor R3 so that charging is performed while the charging voltage of the capacitor C1 is less than a value determined to be approximately constant with respect to the glow plaque applied voltage V (+). A second charging circuit L2 charges the capacitor C1 through the diode D2 and the constant voltage diodes ZD2 and ZD3, and a third charging circuit charges the capacitor C1 when the glow plaque applied voltage g exceeds a certain value. L
3, and is charged by charging current 11 from charging circuit L1, charging current 12 from charging circuit L2, and charging current i3 from charging circuit L3. The capacitor C1 is charged by the charging circuits L1 and L2 when the voltage Vc+ applied to the glow plug is below the set value, and when it is above the set value, the charging circuit L3 is further combined and the charging circuits Ll, L2, L3 are combined. All of them are made to work. The operation of the first timer will be explained below. Applied voltage V to the terminal of glow plug 3 (when + is low voltage (
For example, for V (+<11 volts), charging circuits L1 and 1
The capacitor C1 is charged only with the charging currents 11 and 12 of 2, and as the voltage Va increases, R9, ZD2, ZD3
is corrected by the charging current i3 from the charging circuit L3 connected in series. These three charging circuits set the voltage applied to the glow plug terminal as vg, the charging voltage of C1 as Vc, the reference voltage of comparator 600 as Vi, the breakdown voltage of diode D2 as When VZ is used, it works as follows. a) When Va is high (for example, V(+ > 11pol 1~) M:>Vc +Vf +Vz (Vz >Vc +
Vf ) Vc = 1/CI J(il+i2+i3)
dj・(1)b) When Vg is moderate (for example, 11 volts>, V g > p, volts) ■g+Vf +Vz ≧vg> (R3+R4)/R3
(Vc +Vf) C) When Vg is low (e.g. 8 volts>Vg) V
q≦('R3+R4)/R3(Vc +Vf)Vc
= 1/CI Jildt... (3) a), b), C
) The charging voltage characteristic line in each case is shown in the graph of FIG. 2 as 81.6+, C2. The above equations (1) to (3) that determine the charging voltage Vc to C1 are the charging characteristics when VC is normally at the reference voltage Vi, and in reality, when the circuit L1 acts, Vc = Since charging starts from 0, the relationship between V(+, Vf, Vc, and VZ) leads to charging as shown in Figure 2. Therefore, when the power supply voltage Vg is high, the characteristic curve a shown in Figure 2 Initially, charging currents 11, 12 and i3 are used to initially charge the fish to the speed of the fish, and then charging currents 11 and 12 are used to charge the comparator 6.
0 reversal time, that is, the energization time of the first timer 60 is determined. Note that the inflection point S of each curve a, l), and C is the charging pressure Vc = V2-Vf = VgxR3/(R3→-R4
)-Vf. The charging curve for C1 is as shown in Fig. 2 under each voltage condition, and from these condition settings, the energization time to the glow plug 3 due to the output of the first timer 6 in Fig. 1 is determined from the needle line formula. The figure shows the experimental value O mark and the limit value (line) of the example. The generation position of the inflection point Q on the energization time-applied voltage characteristic curve accompanying the generation of the above-mentioned inflection point P is the Zener diode (
By appropriately selecting the breakdown voltage value Vz (ZD2, ZD3), -C can be freely set according to the glow plug characteristics. Advantageous energization time control can be performed by determining the condition that the surface temperature of the plug is almost constant and the temperature of the internal heating element on the larger side is a constant temperature close to the disconnection humidity. . As described above, the glow plug temperature control device of the present invention includes a first timer whose output time constant changes according to the input voltage, and a glow plug provided in the energizing circuit, which is turned ON by the output of the first timer. In a glow plug temperature control device that includes a first relay that is turned off, the first timer serves as a charging circuit for the capacitor for determining the limit, and a first charging circuit that constantly energizes the capacitor. A second charging circuit includes a Zener diode, and the voltage applied to the globe lag is a constant value. Since the third charging circuit is configured to perform charging when the glow plug exceeds the current value, the energization time to the glow plug can be appropriately increased or decreased depending on changes in the power supply voltage, and the melting of the heating element can be reliably prevented. Moreover, rapid preheating and temperature rise are possible. 4. Brief description of the drawings Figure 1 is a block diagram showing the temperature control device for glow plugs of the present invention, Figure 2 is a J graph showing the charging characteristics of the capacitor, and Figure 3 is a glow plug using the first timer. 3 is a graph showing the relationship between the energization time and the terminal voltage of the glow plug. In the diagram 4...First relay 6...First timer C
1... Capacitor for determining the time constant of the first timer 1... First charging circuit L2... Second charging circuit L3... Third charging circuit Figure 1 4F11-th Figure 2 Figure 3 Group Lug '43-Hetaku Xll [l Dentan ■9

Claims (1)

【特許請求の範囲】 １）入力電圧に応じて出力時定数が変化づる第１のタイ
マと、グロープラグへの通電回路に設けられ前記第１の
タイマの出力で開閉される第１のリレーとを備えたグロ
ープラグの温度制御装置において、 第１のタイマは時限決定のためのコンテン１ノへの充電
回路として、常峙通電を行う第１の充電回路と、上記コ
ンデンサの充電々旺がグロープラク印加電圧に対してほ
ぼ一定比になるように決める値に満たない間充電が行わ
れるようにした第２の充電回路と、ツェナーダイオード
を含みクロープル ラグの印加電々が一定値を越えて大きいどきに充電が行
われるようにした第３の充電回路とからなることを特徴
とするグロープラグの温度制御Ｉ装置。[Claims] 1) A first timer whose output time constant changes according to the input voltage, and a first relay that is provided in a circuit that supplies electricity to the glow plug and is opened and closed by the output of the first timer. In a glow plug temperature control device equipped with a glow plug, the first timer serves as a charging circuit for the content 1 for determining the time limit, and the first charging circuit performs constant energization, and the charger for the capacitor is connected to the glow plug. A second charging circuit that performs charging while the voltage is below a predetermined value that is approximately a constant ratio to the applied voltage; 1. A temperature control device for a glow plug, comprising: a third charging circuit configured to perform the following steps.
JP137683A 1983-01-07 1983-01-07 Temperature control device for glow plug Granted JPS59126078A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP137683A JPS59126078A (en) 1983-01-07 1983-01-07 Temperature control device for glow plug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP137683A JPS59126078A (en) 1983-01-07 1983-01-07 Temperature control device for glow plug

Publications (2)

Publication Number Publication Date
JPS59126078A true JPS59126078A (en) 1984-07-20
JPH0235155B2 JPH0235155B2 (en) 1990-08-08

Family

ID=11499762

Family Applications (1)

Application Number Title Priority Date Filing Date
JP137683A Granted JPS59126078A (en) 1983-01-07 1983-01-07 Temperature control device for glow plug

Country Status (1)

Country Link
JP (1) JPS59126078A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5459534A (en) * 1977-10-21 1979-05-14 Diesel Kiki Co Ltd Preheat time controller for glow plug
JPS54117836A (en) * 1978-03-03 1979-09-12 Diesel Kiki Co Ltd Glow plug preheating time controller
JPS55112072U (en) * 1979-01-31 1980-08-06

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5459534A (en) * 1977-10-21 1979-05-14 Diesel Kiki Co Ltd Preheat time controller for glow plug
JPS54117836A (en) * 1978-03-03 1979-09-12 Diesel Kiki Co Ltd Glow plug preheating time controller
JPS55112072U (en) * 1979-01-31 1980-08-06

Also Published As

Publication number Publication date
JPH0235155B2 (en) 1990-08-08

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