JPH0638771Y2 - Airbag control device - Google Patents
Airbag control deviceInfo
- Publication number
- JPH0638771Y2 JPH0638771Y2 JP11217890U JP11217890U JPH0638771Y2 JP H0638771 Y2 JPH0638771 Y2 JP H0638771Y2 JP 11217890 U JP11217890 U JP 11217890U JP 11217890 U JP11217890 U JP 11217890U JP H0638771 Y2 JPH0638771 Y2 JP H0638771Y2
- Authority
- JP
- Japan
- Prior art keywords
- ignition device
- circuit
- voltage
- ignition
- constant
- 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 - Fee Related
Links
Landscapes
- Air Bags (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 この考案は車両の衝突事故時に搭乗者を安全に保護する
エアバックの制御装置に関するものである。[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an airbag control device for safely protecting an occupant in the event of a vehicle collision.
従来のエアバック制御装置としては、例えば第３図に示
すようなものがある。図において、１は車載バッテリ、
２は車載バッテリ１に接続されたイグニッションスイッ
チ、３はコントローラ、４は図示を省略したエアバック
の展開用直流電源で、この展開用直流電源４は車載バッ
テリ１からイグニッションスイッチ２を介してコントロ
ーラ３に供給されるバッテリ電圧を昇高圧用のDC/DCコ
ンバータ５で昇圧して抵抗６を介してエアバック展開用
の大容量のバックアップコンデンサ７に充電するように
構成されている。As a conventional airbag control device, for example, there is one as shown in FIG. In the figure, 1 is an in-vehicle battery,
Reference numeral 2 is an ignition switch connected to the vehicle-mounted battery 1, 3 is a controller, 4 is a DC power source for deploying an airbag (not shown), and the DC power source 4 for deployment is from the vehicle battery 1 via the ignition switch 2 to the controller 3 The DC / DC converter 5 for boosting / increasing voltage boosts the voltage of the battery to be supplied to the backup capacitor 7 for charging the large-capacity backup capacitor 7 for expanding the airbag via the resistor 6.
8a〜8cは逆流防止用ダイオード、９はバックアップコン
デンサ７への電流の突入を防止し、上記バックアップコ
ンデンサ７の劣化を防止するダイオードである。Reference numerals 8a to 8c are diodes for preventing backflow, and 9 is a diode for preventing current from rushing into the backup capacitor 7 and preventing deterioration of the backup capacitor 7.
10はCPUなどからなる診断回路、11は診断回路用電源部
で、車載バッテリ１からバッテリ電圧が供給され、イグ
ニッションスイッチ２のオン時には診断回路10へ所定の
電力を供給し、またイグニッションスイッチ２のオフ時
には診断回路10内のRAMにバックアップ電力を供給する
ものである。12はランプ制御回路で、このランプ制御回
路12はランプ13およびリレー14の常開接点14aを介して
車載バッテリ１の正極に接続されている。10 is a diagnostic circuit including a CPU, 11 is a power source for the diagnostic circuit, which is supplied with the battery voltage from the on-vehicle battery 1, supplies predetermined power to the diagnostic circuit 10 when the ignition switch 2 is turned on, and When it is off, backup power is supplied to the RAM in the diagnostic circuit 10. Reference numeral 12 is a lamp control circuit, and the lamp control circuit 12 is connected to the positive electrode of the vehicle-mounted battery 1 via the lamp 13 and the normally open contact 14a of the relay 14.
15a〜15dはダイオード、16〜18は車体各部に設けられた
衝突検出手段で、この衝突検出手段16〜18はそれぞれ所
定の加速度で入出力間を閉成する加速度スイッチ16a〜1
8aと抵抗16b〜18bとを並列に接続した構成である。15a to 15d are diodes, 16 to 18 are collision detection means provided in each part of the vehicle body, and these collision detection means 16 to 18 are acceleration switches 16a to 1 for closing input and output at predetermined accelerations.
8a and resistors 16b to 18b are connected in parallel.
19はステアリング部などに設けられた点火装置で、この
点火装置19はステアリング部に設けられたエアバックを
展開するための火薬に点火する電極となるものである。Reference numeral 19 denotes an ignition device provided in the steering portion and the like, and the ignition device 19 serves as an electrode for igniting explosives for deploying an airbag provided in the steering portion.
次に動作について説明する。Next, the operation will be described.
イグニッションスイッチ２を閉成すると、車載バッテリ
１からの電圧は診断回路用電源部11に供給されると共
に、DC/DCコンバータ５に供給され、DC/DCコンバータ５
で昇圧されて抵抗６とコンデンサ７とで決まる時定数で
ダイオード8cを介してバックアップコンデンサ７に充電
され、バックアップコンデンサ７の充電電圧を車載バッ
テリ１の電圧よりも常に高くしておく。When the ignition switch 2 is closed, the voltage from the vehicle-mounted battery 1 is supplied to the diagnostic circuit power supply unit 11 and also to the DC / DC converter 5, and the DC / DC converter 5
Is charged in the backup capacitor 7 via the diode 8c with a time constant determined by the resistor 6 and the capacitor 7, and the charging voltage of the backup capacitor 7 is always higher than the voltage of the vehicle battery 1.
診断回路10は抵抗16b〜18bのそれぞれに発生する電圧、
バックアップコンデンサ７の充電電圧などのデータを入
力し、常開の加速度スイッチ16a〜18aのいずれかが短絡
に近い状態になって抵抗16b〜18bの端子間に発生する電
圧が正常時と異なった値となった場合などには、それを
故障と判定して故障の種類に対応する所定のモードでラ
ンプ13を駆動する。The diagnostic circuit 10 is a voltage generated in each of the resistors 16b-18b,
Data such as the charging voltage of the backup capacitor 7 is input, and one of the normally open acceleration switches 16a to 18a is in a state close to a short circuit, and the voltage generated between the terminals of the resistors 16b to 18b is different from the normal value. In the case of, the lamp 13 is determined to be a failure, and the lamp 13 is driven in a predetermined mode corresponding to the type of failure.
上記構成において、車両が衝突して所定以上の負の加速
度が発生し、加速度スイッチ16a〜18aのいずれかがオン
すると、バックアップコンデンサ７に充電された電荷が
流れることになる。すると、点火装置19が発熱し、火薬
に点火してエアバックが展開されることになり搭乗者が
保護されることになる。In the above configuration, when the vehicle collides and negative acceleration more than a predetermined value is generated and any of the acceleration switches 16a to 18a is turned on, the electric charge charged in the backup capacitor 7 flows. Then, the ignition device 19 generates heat, ignites the explosive powder, and the airbag is deployed, so that the occupant is protected.
なお、点火装置19の線間短絡を診断していなかったため
線間短絡が発生し、かつ衝突事故が発生した場合にはエ
アバックシステムが作動せず、エアバックが展開しない
という問題点がある。このため、点火装置19の線間短絡
を診断できるようにする必要がある。There is a problem that the air bag system does not operate and the air bag does not deploy when a line short circuit occurs and a collision accident occurs because the line short circuit of the ignition device 19 has not been diagnosed. Therefore, it is necessary to be able to diagnose the line short circuit of the ignition device 19.
しかしながら、このような従来のエアバック制御装置に
あっては、点火装置19の線間短絡の診断を行うには点火
装置19の抵抗値（インピーダンス）が小さく、また衝突
事故以外では点火装置19が点火しないようにするために
衝突検出手段16〜18の抵抗16b〜18bの値を大きくして電
流値が規制されているために、点火装置19の抵抗値を精
度よく検出する必要がある場合、検出電圧が小さく精度
を上げることはできない。また、点火装置19の線間短絡
の診断は困難で診断を行っても誤診断（不発に対する信
頼性の低下）するという問題点があった。However, in such a conventional airbag control device, the resistance value (impedance) of the ignition device 19 is small in order to diagnose the line short circuit of the ignition device 19, and the ignition device 19 is used except for a collision accident. In order to prevent ignition, since the current value is regulated by increasing the value of the resistance 16b-18b of the collision detection means 16-18, if it is necessary to accurately detect the resistance value of the ignition device 19, The detection voltage is too small to improve accuracy. Further, it is difficult to diagnose a short circuit between the ignition devices 19, and even if the diagnosis is made, there is a problem that a false diagnosis (reliability with respect to non-fire) is made.
この考案はこのような従来の問題点に着目してなされた
もので、点火装置の一端を一定電圧に保ち、かつ点火装
置に定電流を流すことにより線間短絡の診断を行えるよ
うにして不発に対する信頼性を向上させるようにしたエ
アバック制御装置を提供することを目的とする。The present invention has been made in view of such a conventional problem, in which one end of the igniter is kept at a constant voltage and a constant current is passed through the igniter so that a short circuit between lines can be diagnosed. It is an object of the present invention to provide an airbag control device having improved reliability.
この考案に係るエアバック制御装置は、火薬に点火する
ための点火装置の一端を一定電圧に保持する定電圧回路
と、上記点火装置の他端に定電流を流す定電流回路と、
上記点火装置の両端の電位差を検出する差動増幅器と、
この差動増幅器の出力電圧を基準電圧と比較し、上記基
準電圧より上記出力電圧が下回ったき短絡信号を出力す
る比較回路とからなるものである。An airbag control device according to the present invention comprises a constant voltage circuit for holding one end of an ignition device for igniting explosives at a constant voltage, a constant current circuit for supplying a constant current to the other end of the ignition device,
A differential amplifier for detecting a potential difference between both ends of the ignition device,
The output voltage of the differential amplifier is compared with a reference voltage, and a comparator circuit that outputs a short circuit signal when the output voltage is lower than the reference voltage is output.
この考案におけるエアバック制御装置は、火薬に点火す
るための点火装置の一端を一定電圧に保持すると共に、
上記点火装置の他端に定電流を流し、上記点火装置の両
端の電位差を検出してその出力電圧が比較回路の基準電
圧より下回ったときに短絡信号を出力するようにして線
間短絡を診断できるようにしたものである。The airbag control device according to the present invention holds one end of an ignition device for igniting explosive at a constant voltage, and
A constant current is passed to the other end of the ignition device, the potential difference between both ends of the ignition device is detected, and a short circuit signal is diagnosed by outputting a short circuit signal when the output voltage falls below the reference voltage of the comparison circuit. It was made possible.
以下、この考案を図面に基づいて詳細について説明す
る。Hereinafter, the present invention will be described in detail with reference to the drawings.
第１図はこの考案の一実施例を示すブロック図で、第１
図において第３図と同一または均等な構成部分には同一
符号を付して重複説明を省略する。FIG. 1 is a block diagram showing an embodiment of the present invention.
In the figure, the same or equivalent components as in FIG.
まず構成を説明すると、図において、20は点火装置19の
電流が流れ込む上流側に電圧を印加する点火装置電流制
限用回路を内蔵した定電圧回路、21は点火装置19の下流
側に接続された定電流回路、22は点火装置19の両端の電
位差が供給される差動増幅器、23は差動増幅器22の出力
が基準電圧を下回ったとき短絡信号を出力する比較回路
である。First, explaining the configuration, in the figure, 20 is a constant voltage circuit incorporating an ignition device current limiting circuit for applying voltage to the upstream side where the current of the ignition device 19 flows, 21 is connected to the downstream side of the ignition device 19 A constant current circuit, 22 is a differential amplifier to which a potential difference between both ends of the ignition device 19 is supplied, and 23 is a comparison circuit which outputs a short circuit signal when the output of the differential amplifier 22 falls below a reference voltage.
次に動作について説明する。Next, the operation will be described.
車両が衝突して所定以上の負の加速度が発生し、加速度
スイッチ16a〜18aのいずれかがオンすると、バックアッ
プコンデンサ７に充電された電荷が流れることになる。
このため、点火装置19が発熱し、火薬に点火してエアバ
ックが展開されることになり搭乗者が保護されることは
従来と同様であるので、その説明は省略する。When a vehicle collides and negative acceleration more than a predetermined value is generated and any of the acceleration switches 16a to 18a is turned on, the electric charge charged in the backup capacitor 7 flows.
For this reason, the ignition device 19 generates heat, ignites the explosive powder, and the airbag is deployed, so that the occupant is protected, which is the same as in the conventional case, and therefore the description thereof is omitted.
点火装置19の線間短絡の診断動作はまず衝突検出手段16
〜18の故障診断を行う。そして、衝突検出手段16〜18が
正常な場合、第２図に示す診断タイミングにより定電圧
回路20および定電流回路21をT1時間動作（オン）させ、
点火装置19に一定の電流を供給し、点火装置19の両端の
電位差を差動増幅器22により検出し、次いで比較回路23
により基準電圧と比較する。そして、差動増幅器22の出
力電圧が基準電圧より下回ったとき比較回路23は短絡信
号を出力する。すなわち、比較回路23の出力は診断回路
10でT1時間中にＮ回のカウントを取り、Ｎ回全て点火装
置19の線間短絡（NG）を検知した場合N1とし、Nn回NGデ
ータが累積した場合、ランプを点灯させて点火回路の線
間短絡を報知する。The diagnostic operation of the short circuit between the ignition devices 19 is first the collision detection means 16
Perform ~ 18 fault diagnosis. When the collision detection means 16-18 are normal, the constant voltage circuit 20 and the constant current circuit 21 are operated (turned on) for T1 time at the diagnostic timing shown in FIG.
A constant current is supplied to the ignition device 19, the potential difference across the ignition device 19 is detected by the differential amplifier 22, and then the comparison circuit 23
Is compared with the reference voltage. Then, when the output voltage of the differential amplifier 22 falls below the reference voltage, the comparison circuit 23 outputs a short circuit signal. That is, the output of the comparison circuit 23 is the diagnostic circuit.
At 10 times, T times are counted N times and N times are detected when a line short circuit (NG) of the ignition device 19 is detected, and when Nn times NG data is accumulated, the lamp is turned on to turn on the ignition circuit. Signals a short circuit between wires.
以上説明してきたようにこの考案によれば、その構成
を、火薬に点火するための点火装置と、この点火装置に
直列に接続され、点火電流を流す衝突検出手段と、上記
点火装置の一端を一定電圧に保持する定電圧回路と、上
記点火装置の他端に上記衝突検出手段と並列に接続さ
れ、上記点火装置に定電流を流す定電流回路と、上記点
火装置の両端の電位差を検出する差動増幅器とこの差動
増幅器の出力電圧を基準電圧と比較し、上記基準電圧よ
り上記出力電圧が下回ったとき短絡信号を出力する比較
回路とを備えたエアバック制御装置としたため、点火装
置に最大電流を流し、かつ点火装置の一端を一定電圧に
保つことにより線間短絡の診断が行え、不発に対する信
頼性を向上させることができるという効果が得られる。As described above, according to the present invention, an ignition device for igniting explosives, a collision detection means that is connected in series to the ignition device, and causes an ignition current to flow, and one end of the ignition device are provided. A constant voltage circuit that holds a constant voltage, a constant current circuit that is connected in parallel to the collision detection means at the other end of the ignition device, and supplies a constant current to the ignition device, and a potential difference between both ends of the ignition device is detected. Since the airbag control device includes a differential amplifier and a comparison circuit that compares an output voltage of the differential amplifier with a reference voltage and outputs a short circuit signal when the output voltage is lower than the reference voltage, By applying the maximum current and keeping one end of the ignition device at a constant voltage, it is possible to diagnose a line short circuit and improve the reliability against misfire.
第１図はこの考案の一実施例によるエアバック制御装置
を示すブロック図、第２図は第１図の動作を説明するタ
イミングチャート、第３図は従来のエアバック制御装置
の一例を示すブロック図である。 16,17,18……衝突検出手段、19……点火装置、20……定
電圧回路、21……定電流回路、22……差動増幅器、23…
…比較回路。FIG. 1 is a block diagram showing an airbag control device according to an embodiment of the present invention, FIG. 2 is a timing chart for explaining the operation of FIG. 1, and FIG. 3 is a block diagram showing an example of a conventional airbag control device. It is a figure. 16,17,18 ... Collision detection means, 19 ... Ignition device, 20 ... Constant voltage circuit, 21 ... Constant current circuit, 22 ... Differential amplifier, 23 ...
… Comparison circuit.
Claims (1)
この点火装置に直列に接続され、点火電流を流す衝突検
出手段（16,17,18）と、上記点火装置の一端を一定電圧
に保持する定電圧回路（20）と、上記点火装置の他端に
上記衝突検出手段と並列に接続され、上記点火装置に定
電流を流す定電流回路（21）と、上記点火装置の両端の
電位差を検出する差動増幅器（22）と、この差動増幅器
の出力電圧を基準電圧と比較し、上記基準電圧より上記
出力電圧が下回ったとき短絡信号を出力する比較回路
（23）とを備えたエアバック制御装置。1. An ignition device (19) for igniting explosives,
Collision detection means (16, 17, 18) connected in series to the ignition device and flowing an ignition current, a constant voltage circuit (20) for holding one end of the ignition device at a constant voltage, and the other end of the ignition device. A constant current circuit (21) which is connected in parallel with the collision detection means and supplies a constant current to the ignition device, a differential amplifier (22) for detecting a potential difference between both ends of the ignition device, and a differential amplifier (22) An air bag control device comprising: a comparison circuit (23) that compares an output voltage with a reference voltage and outputs a short circuit signal when the output voltage is lower than the reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11217890U JPH0638771Y2 (en) | 1990-10-26 | 1990-10-26 | Airbag control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11217890U JPH0638771Y2 (en) | 1990-10-26 | 1990-10-26 | Airbag control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0469357U JPH0469357U (en) | 1992-06-19 |
| JPH0638771Y2 true JPH0638771Y2 (en) | 1994-10-12 |
Family
ID=31859678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11217890U Expired - Fee Related JPH0638771Y2 (en) | 1990-10-26 | 1990-10-26 | Airbag control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0638771Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8993517B2 (en) | 2001-12-21 | 2015-03-31 | Human Genome Sciences, Inc. | Albumin fusion proteins |
-
1990
- 1990-10-26 JP JP11217890U patent/JPH0638771Y2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8993517B2 (en) | 2001-12-21 | 2015-03-31 | Human Genome Sciences, Inc. | Albumin fusion proteins |
| US9221896B2 (en) | 2001-12-21 | 2015-12-29 | Human Genome Sciences, Inc. | Albumin fusion proteins |
| US9296809B2 (en) | 2001-12-21 | 2016-03-29 | Human Genome Sciences, Inc. | Albumin fusion proteins |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0469357U (en) | 1992-06-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |