JPH01233136A - Ignition detecting device for air bag system - Google Patents
Ignition detecting device for air bag systemInfo
- Publication number
- JPH01233136A JPH01233136A JP63062128A JP6212888A JPH01233136A JP H01233136 A JPH01233136 A JP H01233136A JP 63062128 A JP63062128 A JP 63062128A JP 6212888 A JP6212888 A JP 6212888A JP H01233136 A JPH01233136 A JP H01233136A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- ignitor
- igniter
- ignition
- resistance
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/017—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including arrangements for providing electric power to safety arrangements or their actuating means, e.g. to pyrotechnic fuses or electro-mechanic valves
- B60R21/0173—Diagnostic or recording means therefor
- B60R21/0176—Diagnostic or recording means therefor for firing circuits using only mechanical switches as collision detecting means, in series with pyrotechnic fuses
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Bags (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、エアバックが展開したことを記憶素子に記
憶できるようにした自動車用エアバックシステムの点火
検出装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ignition detection device for an air bag system for an automobile, which is capable of storing information about the deployment of an air bag in a memory element.
自動車の衝突時に乗員を保護するためのエアバンク装置
の故障検出装置としては、例えば特公昭61−5721
9号公報に開示されており、この公報の場合は常開型衝
突検出スイッチと並列に接続した抵抗を介して起動手段
に流れる微小電流によって起動手段に電圧降下を生じさ
せるとともに、起動手段の両端電圧を入力する差動増幅
回路およびその出力を基準値と比較する比較回路とを設
け、常開型衝突検出スイッチの短絡、開放故障および起
動手段の開放故障を検出するものである。For example, a failure detection device for an air bank device for protecting occupants in the event of a car collision is disclosed in Japanese Patent Publication No. 61-5721.
This is disclosed in Publication No. 9, and in the case of this publication, a voltage drop is caused in the starting means by a minute current flowing to the starting means through a resistor connected in parallel with the normally open collision detection switch, and a voltage drop is caused at both ends of the starting means. A differential amplifier circuit that inputs a voltage and a comparison circuit that compares its output with a reference value are provided to detect short circuits, open failures of the normally open type collision detection switch, and open failures of the starting means.
また、特公昭61−51176号公報には、複数個のス
クイブに直列に抵抗器を接続し、その抵抗層と並列に記
録器を接続して構成したエアバック装置の誤爆記録装置
が開示されている。Further, Japanese Patent Publication No. 61-51176 discloses an accidental explosion recording device for an airbag device, which is constructed by connecting a resistor in series to a plurality of squibs and connecting a recording device in parallel with the resistive layer. There is.
第2図は従来のエアバック点火検出装置の構成を示すブ
ロック図であり、図において、1はバッテリ、2.3お
よび4は自動車の衝突時の加速度を検出して点火器(ス
クイブ)5へ電流を流すための加速度センサ(以下、G
センサという)、6は点火電流が流れたとき、電圧降下
を生ずるシャント抵抗である。FIG. 2 is a block diagram showing the configuration of a conventional airbag ignition detection device. In the figure, 1 is a battery, 2, 3 and 4 detect acceleration at the time of a car collision, and send it to an igniter (squib) 5. Acceleration sensor (hereinafter referred to as G
6 is a shunt resistor that causes a voltage drop when the ignition current flows.
21.31.41はそれぞれGセンサ2.3゜4におい
て、スイッチS2.S3.S、と並列に接続された断線
検出抵抗である。21, 31, and 41 respectively at the G sensor 2.3°4 and the switch S2. S3. This is a disconnection detection resistor connected in parallel with S.
7はシャント抵抗6に生じた電圧と基準電圧源8によっ
て発生された電圧とを比較してエアバックの展開された
ことを検出する電圧比較器、9は電圧比較器7の出力信
号を受&−1でエアバックが展開されたことを記41す
る記憶装置である。7 is a voltage comparator that compares the voltage generated across the shunt resistor 6 with the voltage generated by the reference voltage source 8 to detect that the airbag has been deployed; 9 receives the output signal of the voltage comparator 7; -1 is a storage device that records that the airbag has been deployed.
次に動作について説明する。自動車が衝突した場合、加
速度が生じるが、ある値以上の加速度が生じると、Gセ
ンサ2のスイッチS2が閉じるとともに、Gセンサ3ま
たは4の少なくとも片方がスイッチS3またはS4を閉
じる。Next, the operation will be explained. When a car collides, acceleration occurs, and when the acceleration exceeds a certain value, switch S2 of G sensor 2 closes, and at least one of G sensors 3 or 4 closes switch S3 or S4.
これにより、点火器5ヘハソテリ1から点火に必要な電
流が供給され、エアバックが展開する。As a result, the current necessary for ignition is supplied from the igniter 5 to the igniter 1, and the airbag is deployed.
上記点火電流はシャント抵抗6にも流れるようになって
いるので、シャント抵抗6の両端に電圧を生じる。Since the ignition current also flows through the shunt resistor 6, a voltage is generated across the shunt resistor 6.
この電圧が生じたことを電圧比較器7が検出して、点火
検出信号を発生するが、シャント抵抗6に生じた電圧は
基準電圧発生器8によって発生された基準電圧と比較さ
れるようになっている。The voltage comparator 7 detects the generation of this voltage and generates an ignition detection signal, but the voltage generated across the shunt resistor 6 is compared with a reference voltage generated by a reference voltage generator 8. ing.
この基準電圧は、点火のために必要な最小電流がシャン
ト抵抗6に流れたときのシャント抵抗6の電圧に等しく
なっている。This reference voltage is equal to the voltage across the shunt resistor 6 when the minimum current necessary for ignition flows through the shunt resistor 6.
従来のエアバックシステムの点火検出装置は、以上のよ
うに構成されているので、シャント抵抗6に断線等の故
障が発生した場合、Gセンサ2゜3また4のスイッチS
2とS3またはS4が閉しても、電流が流れなくなる危
険性があった。The ignition detection device of the conventional airbag system is configured as described above, so if a failure such as a disconnection occurs in the shunt resistor 6, the switch S of the G sensor 2, 3 or 4 is activated.
Even if S2 and S3 or S4 were closed, there was a risk that current would no longer flow.
また、シャント抵抗6の値は点火器5の抵抗値が小さい
ので、これよりも、さらに小さくする必要があり、この
ためシャント抵抗6の両端に生じる電圧が低くなってし
まい、電圧比較器7がノイズに弱くなるばかりか、シャ
ント抵抗の断線の危険性もあるという問題点があった。In addition, since the resistance value of the igniter 5 is small, the value of the shunt resistor 6 needs to be made even smaller than this value. Therefore, the voltage generated across the shunt resistor 6 becomes low, and the voltage comparator 7 There was a problem that not only was it susceptible to noise, but there was also a risk of the shunt resistor breaking.
この発明は、上記のような問題点を解消するためになさ
れたもので、点火電流経路内にシャント抵抗の挿入の必
要がなく、エアバックシステムの信卸性を下げることな
く、微少電圧による検出をする必要もなく、ノイズにも
強いエアパンクシステムの点火検出装置を得ることを目
的とする。This invention was made in order to solve the above-mentioned problems, and there is no need to insert a shunt resistor into the ignition current path, and detection using minute voltage is possible without reducing the reliability of the airbag system. The purpose of the present invention is to obtain an ignition detection device for an air puncture system that does not require any noise and is resistant to noise.
この発明に係るエアバックシステムの点火検出装置は、
点火器に点火電流が流れたときに点火器の両端に生ずる
電位差を検出する電圧比較器を設けたものである。The ignition detection device for an airbag system according to the present invention includes:
It is equipped with a voltage comparator that detects the potential difference that occurs across the igniter when ignition current flows through the igniter.
この発明においては、点火器自体を、シャント抵抗とし
て利用し、その両端の電位差を電圧比較器に加えて基準
電圧と比較して点火器に点火電流がながれたことを検出
する。In this invention, the igniter itself is used as a shunt resistor, and the potential difference across the igniter is applied to a voltage comparator and compared with a reference voltage to detect whether ignition current has flowed to the igniter.
以下、この発明の実施例を閣について説明する。 Embodiments of the present invention will be described below.
第1図はその一実施例の構成を示すブロック図であり、
この第1図において、1は例えば自動車用バッテリ、2
,3および4は自動車の衝突時の加速度を検出して点火
器5へ電流を流すためのGセンサ、21.31.41は
上記Gセンサ2,3゜4において、スイッチSz 、S
3 、Ss と並列に接続された断線検出抵抗、6は上
記点火器5と並列に接続された抵抗、7.8は、点火器
5の両端の電圧を基準電圧発生器9で発生された基準電
圧と比較して、エアバックが展開されたことを検出する
電圧比較器、10は電圧比較器7.8の出力の論理積を
とるゲート(論理計算器)、11はゲート10の出力信
号を受けてエアバックが展開されたことを記憶する記憶
装置である。FIG. 1 is a block diagram showing the configuration of one embodiment.
In this FIG. 1, 1 is, for example, an automobile battery, 2 is
, 3 and 4 are G sensors for detecting the acceleration at the time of a collision of the automobile and passing a current to the igniter 5, and 21.31.41 are switches Sz, S in the G sensors 2, 3 and 4.
3, a disconnection detection resistor connected in parallel with Ss; 6, a resistor connected in parallel with the igniter 5; 7.8, the voltage across the igniter 5 as a reference generated by the reference voltage generator 9; A voltage comparator detects that the airbag has been deployed by comparing the voltage. 10 is a gate (logic calculator) that takes the AND of the outputs of the voltage comparators 7 and 8. This is a storage device that stores the information that the airbag was deployed in response to the airbag being deployed.
次に、動作について説明する。自動車が衝突すると、加
速度が生じ、Gセンサ2,3.4のスイノチS2 、S
3 、S4が閉じ、点火器5に電流が流れ、その両端に
電位差を生しる。Next, the operation will be explained. When a car collides, acceleration occurs and G sensors 2, 3.4 Suinochi S2, S
3, S4 is closed, current flows through the igniter 5, and a potential difference is generated across it.
このとき、アの位置の電圧はバッテリ1の電圧にほぼ等
しくなり、イの位置の電圧はアース電位(○■)にほぼ
等しくなる。At this time, the voltage at the position A becomes approximately equal to the voltage of the battery 1, and the voltage at the position A becomes approximately equal to the ground potential (○■).
したがって、電圧比較器7によって、イの電圧が、基準
電圧発生器9で発生する一定電圧■1よりも低くなった
ことを検出し、電圧比較器8によって、アの電圧が基準
電圧発生器9で発生ずる一定電圧■2よりも高くなった
ことを検出すれば、(V2 Vl)が点火器5の両端
に生じた電位差である。Therefore, the voltage comparator 7 detects that the voltage A has become lower than the constant voltage ■1 generated by the reference voltage generator 9, and the voltage comparator 8 detects that the voltage A has become lower than the constant voltage ■1 generated by the reference voltage generator 9. If it is detected that the voltage has become higher than the constant voltage (2) generated at , (V2 Vl) is the potential difference generated across the igniter 5.
点火器5の抵抗値ばあらかしめ、わかっているので、流
れた電流i。は、点火器5の抵抗値をR8とすれば、i
o −(V 2 V +)/ Ro となる。Since the resistance value of the igniter 5 is known, the current flowing is i. If the resistance value of the igniter 5 is R8, then i
o −(V 2 V +)/Ro.
エアバック展開のために必要な最小電流値i。Minimum current value i required for airbag deployment.
(min)と、点火器5の抵抗値R8から一定電圧v2
とV、を求め、この一定電圧V、、V2を、基準電圧発
生器9により発生し、電圧比較器7,8に人力する。(min) and a constant voltage v2 from the resistance value R8 of the igniter 5
The constant voltages V, , V2 are generated by the reference voltage generator 9 and input to the voltage comparators 7 and 8 manually.
電圧比較器7は、イの電圧が一定電圧■1よりも低くな
ると、論理「1」の信号を発生し、電圧比較器8はアの
電圧が■2よりも高くなると論理「1」の信号を発生す
るようにすれば、電圧比較器7と8の出力が両方とも論
理「1」であるときのみ、点火器5に電流が流れたこと
を示す。ゲート10は電圧比較器7と8の出力が両方と
も論理「1」であるときに、論理「1」を出力する。す
なわちANDゲートである。The voltage comparator 7 generates a logic "1" signal when the voltage of A becomes lower than the constant voltage ■1, and the voltage comparator 8 generates a logic "1" signal when the voltage of A becomes higher than the constant voltage ■2. , it is indicated that current has flowed through the igniter 5 only when the outputs of the voltage comparators 7 and 8 are both logic "1". Gate 10 outputs a logic "1" when the outputs of voltage comparators 7 and 8 are both logic "1". That is, it is an AND gate.
ところで、よく知られているように、エアパックシステ
ムで使用されるGセンサには、スイッチS2 、S3
、S4 と並列に、断線検出抵抗21゜31.41が挿
入されている。このため、点火器5には常に微少電流が
流れているが、断線検出抵抗21,31.41の値は、
点火器5の抵抗値よりもはるかに大きいので、このとき
のアの電圧は一定電圧V2よりも十分低く、イの電圧は
、一定電圧V、よりも十分高く電圧比較器7と8の出力
が論理「1」になることはない。By the way, as is well known, the G sensor used in the air pack system includes switches S2 and S3.
, S4, a disconnection detection resistor 21°31.41 is inserted. Therefore, although a small current always flows through the igniter 5, the values of the disconnection detection resistors 21 and 31.41 are as follows.
Since it is much larger than the resistance value of the igniter 5, the voltage A at this time is sufficiently lower than the constant voltage V2, and the voltage B is sufficiently higher than the constant voltage V, so that the outputs of the voltage comparators 7 and 8 are It will never be logical ``1''.
しかるに、点火器5が断線したとき、または、その抵抗
値が断線検出抵抗21.31.41に比して十分大きく
なったときには、アの電圧が一定電圧V2よりも高く、
イの電圧が一定電圧■1よりも低くなってしまい、エア
バックが展開していないのに点火検出信号をゲート10
が発生してしまうことになる。However, when the igniter 5 is disconnected or its resistance value becomes sufficiently larger than the disconnection detection resistor 21, 31, 41, the voltage A is higher than the constant voltage V2,
Voltage A becomes lower than constant voltage ■1, and the ignition detection signal is sent to gate 10 even though the airbag is not deployed.
will occur.
これを防止するために、点火器5と並列に抵抗6を接続
しておく。すなわち、点火器5が断線したとき、あるい
はその抵抗値が大きくなったときにも、点火器5と抵抗
6の合成抵抗値は断線検出抵抗21,31.41に比し
て、大きくなりすぎないように、抵抗6の抵抗値を設定
しておけば、電圧比較器7と8の出力が誤って論理「1
」となることはない。To prevent this, a resistor 6 is connected in parallel with the igniter 5. That is, even when the igniter 5 is disconnected or its resistance value increases, the combined resistance value of the igniter 5 and the resistor 6 will not become too large compared to the disconnection detection resistors 21, 31, 41. If the resistance value of resistor 6 is set as shown in FIG.
” will never occur.
以」二のように、この発明によれば、点火器に並列に抵
抗を接続し、この点火器の両端に生した電圧を電圧比較
器で一定電圧と比較して点火電流が流れたことを検出す
るように構成したので、点火電流経路内にシャント抵抗
を挿入するなどしてエアバックシステムの信頼性を下げ
ることなく、また、微少電圧による検出をする必要もな
いので、ノイズにも強くすることができるという優れた
効果がある。As described in Part 2, according to the present invention, a resistor is connected in parallel to the igniter, and the voltage generated across the igniter is compared with a constant voltage using a voltage comparator to determine whether the ignition current has flowed. Since it is configured to detect this, there is no need to lower the reliability of the airbag system by inserting a shunt resistor into the ignition current path, and there is no need to detect using minute voltages, making it resistant to noise. It has the excellent effect of being able to
第1図はこの発明の一実施例によるエアバックシステム
の点火検出装置のブロック図、第2図□は、従来のエア
バックシステムの点火検出装置の回路図である。
1・・・バッテリ、2,3.4・・・Gセンサ、5は点
火器、6・・・抵抗、7.8・・・電圧比較器、9・・
・基準電圧発生器、10・・・ゲート、11は記憶装置
。
なお、図中同一符号は同一、または相当部分を示す。FIG. 1 is a block diagram of an ignition detection device for an air bag system according to an embodiment of the present invention, and FIG. 2 □ is a circuit diagram of a conventional ignition detection device for an air bag system. 1...Battery, 2,3.4...G sensor, 5 is igniter, 6...Resistor, 7.8...Voltage comparator, 9...
・Reference voltage generator, 10...gate, 11 is a memory device. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
第1の加速度センサおよび並列に接続された第2,第3
の加速度センサと、上記第1の加速度センサと上記並列
に接続された第2,第3の加速度センサとの間に挿入さ
れ上記第1の加速度センサと上記第2または第3の加速
度センサのうちの少なくとも一方が上記自動車の衝突を
検出したとき電流が流れてエアバックを展開するための
点火器と、この点火器の両端の電圧をそれぞれ異なる所
定の一定の基準電圧とを比較して上記点火器が点火した
ことを検知する第1,第2の電圧比較器と、この第1,
第2の電圧比較器の出力の論理計算をする論理回路と、
この論理回路の出力を記憶する記憶装置と、上記点火器
と並列に接続され上記点火器が断線または異常な抵抗値
を示したときに上記第1,第2の電圧比較器が誤って電
位差を検出することを防止するための抵抗とを備えたエ
アバック・システムの点火検出装置。A first acceleration sensor that detects acceleration by closing a switch when a car crashes, and second and third acceleration sensors connected in parallel.
of the first acceleration sensor and the second or third acceleration sensor inserted between the first acceleration sensor and the second and third acceleration sensors connected in parallel. When at least one of the above detects a collision of the automobile, a current flows through an igniter to deploy the airbag, and the voltage across the igniter is compared with a predetermined constant reference voltage that is different from each other, and the above-mentioned ignition is started. first and second voltage comparators for detecting that the device has ignited;
a logic circuit that performs logical calculations on the output of the second voltage comparator;
A storage device that stores the output of this logic circuit is connected in parallel with the igniter, and when the igniter is disconnected or exhibits an abnormal resistance value, the first and second voltage comparators erroneously detect a potential difference. An ignition detection device for an airbag system having a resistance for preventing detection.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63062128A JPH01233136A (en) | 1988-03-15 | 1988-03-15 | Ignition detecting device for air bag system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63062128A JPH01233136A (en) | 1988-03-15 | 1988-03-15 | Ignition detecting device for air bag system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01233136A true JPH01233136A (en) | 1989-09-18 |
Family
ID=13191125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63062128A Pending JPH01233136A (en) | 1988-03-15 | 1988-03-15 | Ignition detecting device for air bag system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01233136A (en) |
-
1988
- 1988-03-15 JP JP63062128A patent/JPH01233136A/en active Pending
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