JPS5919859B2 - Valve disconnection detection device - Google Patents
Valve disconnection detection deviceInfo
- Publication number
- JPS5919859B2 JPS5919859B2 JP53145072A JP14507278A JPS5919859B2 JP S5919859 B2 JPS5919859 B2 JP S5919859B2 JP 53145072 A JP53145072 A JP 53145072A JP 14507278 A JP14507278 A JP 14507278A JP S5919859 B2 JPS5919859 B2 JP S5919859B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- valve
- bulb
- turned
- change
- 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
Description
【発明の詳細な説明】
本発明は例えば自動車等におけるバルブ断線検出装置に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve disconnection detection device for use in, for example, automobiles.
従来自動車において複数個のバルブが１個のスイッチに
よりー度に点灯されるような場合、該バルブの断線検出
は点灯回路を流れる電流量の変化によつて検出する方策
をとるのが普通である。Conventionally, when multiple bulbs are turned on at once by a single switch in a car, it is common practice to detect disconnection of the bulb by detecting changes in the amount of current flowing through the lighting circuit. be.
このような従来方策では、回路を流れる電流は大電流で
あるから検出部が高価にならざるを得ない欠点を有して
いる。本発明は上記の従来の欠点に鑑み、極めて安価で
且つ電圧降下の懸念もないバルブ断線検出装置５ を提
供するものである。Such conventional measures have the disadvantage that the detection section must be expensive because the current flowing through the circuit is large. In view of the above-mentioned conventional drawbacks, the present invention provides a valve disconnection detection device 5 that is extremely inexpensive and free from voltage drop concerns.
一般にバルブにおいてはフイラメントカ功口熱された状
態では抵抗が増大し、冷たくなると抵抗が減少する。Generally, in a valve, the resistance increases when the filament is heated, and decreases when the filament gets cold.
例えば自動車に用いられている２３Ｗ電球を例１０にと
ると、電圧が印加されていないときは１Ω以下のほゞ導
通状態にあり、電圧印加によりフィラメントが温められ
ると抵抗は７Ω以上になる。For example, in Example 10, a 23W light bulb used in automobiles is in a nearly conductive state of 1Ω or less when no voltage is applied, and when the filament is warmed by voltage application, the resistance increases to 7Ω or more.
再び電圧を遮断するとフィラメントが冷えるまでの微小
時間の間に７Ωから１Ωまで抵抗値が変化す１５る特性
を有している。本発明は上記のようなバルブ消灯直後の
フィラメント抵抗変化特性に着目し、これを利用してバ
ルブ断線チェックを行なうものである。When the voltage is cut off again, the resistance value changes from 7Ω to 1Ω during the minute time it takes for the filament to cool down. The present invention focuses on the filament resistance change characteristic immediately after the bulb is turned off, and utilizes this to check for bulb breakage.
第１図は本発明の一実施例を示す回路図で、１２０は電
源、２はバルブ点灯用スイッチで、該スイッチ２をオン
とすることにより複数のバルブ３は点灯する。FIG. 1 is a circuit diagram showing an embodiment of the present invention, in which 120 is a power source, 2 is a bulb lighting switch, and when the switch 2 is turned on, a plurality of bulbs 3 are lit.
４は本発明にかかるバルブ断線検出回路で、定電圧電源
５、設定電圧発生部６、バルブ３への定２５電圧印加部
１、タイミング信号発生部８、比較器９及び保持回路１
０等よりなる。4 is a valve disconnection detection circuit according to the present invention, which includes a constant voltage power supply 5, a set voltage generation section 6, a constant 25 voltage application section 1 to the valve 3, a timing signal generation section 8, a comparator 9, and a holding circuit 1.
Consists of 0 magnitude.
以下その作動を説明すると、バルブ点灯用スイッチ２が
オンでバルブ３が点灯すると、設定電圧発生部６のスイ
ッチ６１がオンとなり、コンデン３０ サ６２に定電圧
電源５より電圧が印加され充電する。The operation will be explained below. When the bulb lighting switch 2 is turned on and the bulb 3 is lit, the switch 61 of the set voltage generating section 6 is turned on, and a voltage is applied to the capacitor 30 from the constant voltage power supply 5 to charge it.
スイッチ２をオフとしバルブ３を消灯するとスイッチ６
１もオフとなり、同時にタイミング信号発生部８よりス
イッチ６３及び１２を所定時間第３５ ンとさせる信号
が発せられ、コンデンサ６２より定抵抗６４を通つてア
ースされる放電回路が形成され且つ定電圧電源５より定
抵抗Ｔｉを介してバルブ３に微小電圧を印加する回路が
形成される。When switch 2 is turned off and bulb 3 is turned off, switch 6
1 is also turned off, and at the same time, a signal is issued from the timing signal generator 8 to turn on the switches 63 and 12 for a predetermined period of time, and a discharge circuit is formed in which the capacitor 62 is grounded through the constant resistor 64, and the constant voltage power source is connected. 5 forms a circuit that applies a minute voltage to the bulb 3 via the constant resistance Ti.
コンデンサ６２の充放電特性は第２図に示す通りである
が、一方スイツチ２がオフとなりスイツチ７２がオンと
なつたときのバルブ３の端子電圧は消灯直後フイラメン
トがまだ熱く抵抗値が大きい状態では高く、その後フイ
ラメントが冷え抵抗値が小となるに従つて定抵抗ｒ１と
バルブ抵抗で分圧され、だんだん低下し、第３図実線示
のような電圧特性を示す。そこで第２図示のコンデンサ
６２の放電時のある時間ｔ内の放電電圧特性を、第３図
のバルブ３正常時（断線なし）のバルブ消灯直後の電圧
降下特性の一部に近似するよう設定しておき、該時間ｔ
内におけるコンデンサ６２の放電電圧特性信号ｆとバル
ブの端子電圧特性信号ｇを比較器９にて比較する。The charging and discharging characteristics of the capacitor 62 are as shown in Fig. 2.On the other hand, when the switch 2 is off and the switch 72 is on, the terminal voltage of the bulb 3 is as follows, immediately after the light is turned off, when the filament is still hot and has a large resistance value. After that, as the filament cools and the resistance value decreases, the voltage is divided by the constant resistance r1 and the valve resistance, and gradually decreases, showing the voltage characteristics as shown by the solid line in FIG. Therefore, the discharge voltage characteristic during a certain time t during discharge of the capacitor 62 shown in Figure 2 is set to approximate a part of the voltage drop characteristic immediately after the bulb is turned off when the bulb 3 is normal (no disconnection) in Figure 3. and the corresponding time t
A comparator 9 compares the discharge voltage characteristic signal f of the capacitor 62 and the terminal voltage characteristic signal g of the bulb.
もし複数のバルブ３のうち１個でも断線していると、フ
イラメントの合成抵抗値が増加するので、消灯直後の端
子電圧は第３図の点線示のようにバルブ正常時にくらべ
全体的に増大し、ｔ時間内における電圧降下特性は設定
されたコンデンサの放電電圧特性と近似しなくなる。If even one of the multiple bulbs 3 is broken, the combined resistance of the filament will increase, so the terminal voltage immediately after the light goes out will increase overall compared to when the bulbs are normal, as shown by the dotted line in Figure 3. , the voltage drop characteristic within time t no longer approximates the set discharge voltage characteristic of the capacitor.
このように両者の電圧特性が近似しない場合はバルブ３
が断線していると判断し比較器９よりバルブ断線信号が
発せられ、保持回路１０を介して断線表示が行なわれる
。In this way, if the voltage characteristics of the two are not similar, the valve 3
It is determined that the valve is disconnected, the comparator 9 issues a valve disconnection signal, and the holding circuit 10 displays a disconnection indication.
第１図のタイミング信号発生部８のタイミング信号タイ
ムチヤートは第４図に示す通りであり、タイミング信号
発生部８における比較時間ｔを設定するパルスを得るた
めの回路例は第５図に示す通りである。The timing signal time chart of the timing signal generator 8 in FIG. 1 is as shown in FIG. 4, and the circuit example for obtaining the pulse for setting the comparison time t in the timing signal generator 8 is as shown in FIG. It is.
即ちバルブ点灯用スイツチ２の信号ａをコンデンサＣと
抵抗Ｒよりなる微分回路により微分してａ″のようなパ
ルスを得て、トランジスタＴｒにて設定時間ｔの巾をも
つパルス信号Ｃ，ｄ，ｅをスイツチ６３，７２及び比較
器９に発する。That is, the signal a of the bulb lighting switch 2 is differentiated by a differentiating circuit consisting of a capacitor C and a resistor R to obtain a pulse a'', and a pulse signal C, d, having a width of a set time t is generated by a transistor Tr. e is sent to the switches 63, 72 and the comparator 9.
尚第１図実施例においては設定電圧発生部６の設定電圧
としてコンデンサの放電電圧を用いる例を示しており、
該放電電圧の一部をバルブ３の消灯直後の億抗変化によ
るバルブ端子電圧降下特性と近似させるよう構成した例
を示しているが、設定電圧発生部６としては消灯後のバ
ルブ端子電圧降下時の少なくともある１点の電圧例えば
第３図において消灯後ｔ時間後の電圧１に近似する電圧
を消灯よりｔ時間後に発生し得る装置であれば本発明の
断線チエツク機能は果し得ることは明らかであり、上記
のような目的を満足し得る任意の構成を採用することが
できる。The embodiment shown in FIG. 1 shows an example in which the discharge voltage of the capacitor is used as the set voltage of the set voltage generator 6.
An example is shown in which a part of the discharge voltage is configured to approximate the bulb terminal voltage drop characteristic due to a resistance change immediately after the bulb 3 is turned off. It is clear that the wire breakage check function of the present invention can be achieved as long as the device is capable of generating a voltage at least at one point, for example, voltage 1 at t hours after lights out in FIG. Any configuration that can satisfy the above objectives can be adopted.
又バルブ端子電圧の降下特性は場合によつて幾分差があ
るので、設定電圧特性との比較はある所定の近似範囲内
にあれば断線なし、それ以外は断線と判断し得るよう構
成すべきである。Also, since the drop characteristics of the valve terminal voltage vary somewhat depending on the case, it should be configured so that when comparing it with the set voltage characteristics, it can be determined that there is no disconnection if it is within a certain approximation range, and that it can be determined that there is a disconnection otherwise. It is.
定電圧電源５の電圧は車載電源１の篭圧にくらべはるか
に低い電圧（例えば３ボルト程度）とするＯ以上のよう
に本発明によればバルブ消灯直後フイラメントが高温で
抵抗値が冷態時に比し非常に大であり、微少時間内にフ
イラメントの温度低下に伴ない抵抗値が大きく変化する
ことに着目し、バルブ消灯直後の抵抗値が大なる範囲で
の抵抗値変化を検出してバルブの断線チエツクを行なう
ようにしたもので、これにより該断線チエツクを極めて
低い電圧にて、各抵抗値のばらつき或は環境温度による
抵抗変化等に影響されることなく正確に行なうことがで
き、又微小電流であるのでマイコン処理が可能であり的
確なる断線検出を安価で小型なる装置で行なうことがで
きる点、実用的に極めて大なる価値をもたらし得るもの
である。The voltage of the constant voltage power supply 5 is much lower than the cage pressure of the on-board power supply 1 (for example, about 3 volts). According to the present invention, immediately after the bulb is turned off, the filament is at a high temperature and the resistance value is low when it is cold. We focused on the fact that the resistance value changes greatly as the temperature of the filament decreases within a very short period of time, and detected the change in resistance value in the range where the resistance value is large immediately after the bulb was turned off. This enables the wire breakage check to be performed accurately at extremely low voltage without being affected by variations in each resistance value or resistance changes due to environmental temperature, and Since it is a minute current, it can be processed by a microcomputer, and accurate disconnection detection can be performed with an inexpensive and small device, which can bring extremely great practical value.
第１図は本発明の一実施例を示すプロツク回路図、第２
図は第１図の設定電圧発生部におけるコンデンサの充放
電特性図、第３図は第１図のバルブ端子電圧特性図、第
４図は第１回のタイミング信号発生部におけるタイミン
グ信号のタイムチヤート、第５図イ，口はタイミング信
号発生部の具体的回路例図及び各部の波形図である。
１・・・・・・車載電源、２・・・・・・バルブ点灯用
スイツチ、３・・・・・・バルブ、４・・・・・・バル
ブ断線検出回路、５・・・・・・定電圧電源、６・・・
・・・設定電圧発生部、ｒ・・・・・・バルブへの定電
圧印加部、８・・・・・・タイミング信号発生部、９・
・・・・・比較器、１０・・・・・・保持回路、６２・
・・・・・コンデンサ。FIG. 1 is a block circuit diagram showing one embodiment of the present invention, and FIG.
The figure is a charging/discharging characteristic diagram of the capacitor in the setting voltage generation part of Figure 1, Figure 3 is a valve terminal voltage characteristic diagram of Figure 1, and Figure 4 is a time chart of the timing signal in the first timing signal generation part. , FIG. 5A shows a specific circuit example of the timing signal generating section and waveform diagrams of each section. 1... Vehicle power supply, 2... Bulb lighting switch, 3... Bulb, 4... Bulb disconnection detection circuit, 5...... Constant voltage power supply, 6...
...Setting voltage generation section, r... Constant voltage application section to the valve, 8... Timing signal generation section, 9.
... Comparator, 10 ... Holding circuit, 62.
...Capacitor.
Claims (1)
る定電圧印加部を設けて、消灯直後のフィラメントの温
度低下に基づく抵抗値変化を該バルブの端子電圧の変化
で検出し、このバルブ端子電圧の変化の一部に近似する
電圧を発生する設定電圧発生部を設け、上記バルブの端
子電圧の変化の一部と設定電圧発生部の電圧とを比較し
て両者が所定の近似関係にないときバルブが断線してい
ると判断してバルブ断線信号を発する比較器と該バルブ
断線信号を保持する保持回路を設けたことを特徴とする
バルブ断線検出装置。 ２ 設定電圧発生部として、バルブ端子電圧の変化に近
似する放電特性を有するコンデンサを用いたことを特徴
とする特許請求の範囲第１項記載のバルブ断線検出装置
。[Scope of Claims] 1. A constant voltage application unit is provided that applies a minute voltage to the bulb for a predetermined period of time immediately after the bulb is turned off, and a change in resistance value due to a decrease in the temperature of the filament immediately after the bulb is turned off is detected by a change in the terminal voltage of the bulb. , a set voltage generator is provided that generates a voltage that approximates a part of the change in the valve terminal voltage, and a part of the change in the valve terminal voltage is compared with the voltage of the set voltage generator to determine that both are at a predetermined level. A valve disconnection detection device comprising a comparator that determines that the valve is disconnected when there is no approximate relationship and issues a valve disconnection signal, and a holding circuit that holds the valve disconnection signal. 2. The valve disconnection detection device according to claim 1, wherein a capacitor having discharge characteristics that approximates changes in valve terminal voltage is used as the set voltage generating section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53145072A JPS5919859B2 (en) | 1978-11-24 | 1978-11-24 | Valve disconnection detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53145072A JPS5919859B2 (en) | 1978-11-24 | 1978-11-24 | Valve disconnection detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5572433A JPS5572433A (en) | 1980-05-31 |
| JPS5919859B2 true JPS5919859B2 (en) | 1984-05-09 |
Family
ID=15376721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP53145072A Expired JPS5919859B2 (en) | 1978-11-24 | 1978-11-24 | Valve disconnection detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5919859B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0340987Y2 (en) * | 1985-02-28 | 1991-08-28 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5134218U (en) * | 1974-09-06 | 1976-03-13 |
-
1978
- 1978-11-24 JP JP53145072A patent/JPS5919859B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5134218U (en) * | 1974-09-06 | 1976-03-13 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0340987Y2 (en) * | 1985-02-28 | 1991-08-28 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5572433A (en) | 1980-05-31 |
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