JP4310743B2 - Air bag ignition device - Google Patents

Air bag ignition device Download PDF

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JP4310743B2
JP4310743B2 JP2004128534A JP2004128534A JP4310743B2 JP 4310743 B2 JP4310743 B2 JP 4310743B2 JP 2004128534 A JP2004128534 A JP 2004128534A JP 2004128534 A JP2004128534 A JP 2004128534A JP 4310743 B2 JP4310743 B2 JP 4310743B2
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circuit
airbag
fuse
ignition device
ignition
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JP2005306292A (en
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孝美 杉山
章宏 新
勇 隠家
實 竪本
尚浩 岸本
康之 後藤
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Mitsubishi Motors Corp
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本発明は、乗用車、バス、トラック等に搭載されるエアバッグ装置に適用され、点火駆動回路からの電流をエアバッグ点火回路を通してエアバッグ点火装置に通電し該エアバッグを点火せしめるように構成するとともに、抵抗とヒューズとを備えた無能化回路を前記点火駆動回路に対してエアバッグ点火装置と並列に接続してなるエアバッグの点火装置に関する。   The present invention is applied to an airbag device mounted on a passenger car, a bus, a truck, and the like, and is configured so that a current from an ignition drive circuit is passed through the airbag ignition circuit to the airbag ignition device to ignite the airbag. In addition, the present invention relates to an airbag ignition device in which a disabling circuit including a resistor and a fuse is connected in parallel to the airbag ignition device with respect to the ignition drive circuit.

車両用エアバッグ装置においては、該エアバッグの点火装置の故障の有無を診断する際等において、エアバッグの無能化回路を前記点火駆動回路に対してエアバッグ点火装置と並列に接続している。
図３は、例えば特許文献１（特開平８−２１６８２５号公報）に開示されている無能化回路を備えたエアバッグの点火装置の構成を示す回路図である。 In a vehicle airbag device, an airbag disabling circuit is connected to the ignition drive circuit in parallel with the airbag ignition device when diagnosing the presence or absence of a failure of the airbag ignition device. .
FIG. 3 is a circuit diagram showing a configuration of an ignition device for an airbag provided with an inefficiency circuit disclosed in, for example, Patent Document 1 (Japanese Patent Laid-Open No. 8-216825).

図３において、３はエアバッグ点火装置、６は該点火装置の抵抗（抵抗値Ｒｓ）である。１は前記エアバッグ点火装置３にエアバッグの駆動電流即ちエアバッグ点火装置３の点火電流を通電する点火駆動回路で、該点火駆動回路１と前記エアバッグ点火装置３との間にエアバッグ点火回路７を形成している。
２０は無能化回路で、前記点火駆動回路１に対して前記エアバッグ点火装置３と並列に接続されており、抵抗１３（抵抗値Ｒｄ）とヒューズ４（抵抗値Ｒｆ）とが直列に接続された構成となっている。 In FIG. 3, 3 is an airbag ignition device, and 6 is a resistance (resistance value Rs) of the ignition device. An ignition drive circuit 1 energizes the airbag ignition device 3 with an airbag drive current, that is, an ignition current of the airbag ignition device 3. Between the ignition drive circuit 1 and the airbag ignition device 3, airbag ignition is performed. A circuit 7 is formed.
Reference numeral 20 denotes an inefficiency circuit, which is connected in parallel to the airbag ignition device 3 with respect to the ignition drive circuit 1, and a resistor 13 (resistance value Rd) and a fuse 4 (resistance value Rf) are connected in series. It becomes the composition.

５は該無能化回路２０と前記エアバッグ点火回路７との接断を行う切換スイッチで、エアバッグ点火装置３を作動可能な状態にするときには、該切換スイッチ５の接点Ａをエアバッグ点火回路７側の接点Ｂに接続して前記点火駆動回路１とエアバッグ点火回路７とを接続するとともに無能化回路２０を遮断する。また、エアバッグ点火装置３を不作動とするときには、該切換スイッチ５の接点Ａを無能化回路２０側の接点Ｃに接続して前記点火駆動回路１と無能化回路２０とを接続するとともにエアバッグ点火回路７を遮断する。
つまり、かかる作動時において、エアバッグを点火させる駆動電流は無能化回路２０側に流れる。このとき、駆動電流はヒューズ４を溶断する。このため、該ヒューズ４の溶断を確認することにより、切換スイッチ５がエアバッグ点火装置３を不作動していたことを検出することができる。
前記エアバッグ点火装置３と無能化回路２０とは、前記点火駆動回路１に接続したときに両者を流れる電流値が同一になるように、該エアバッグ点火装置３の抵抗６（抵抗値Ｒｓ）並びに無能化回路２０の抵抗（抵抗値Ｒｄ）及びヒューズ４（抵抗値Ｒｆ）の抵抗値を設定している。 Reference numeral 5 denotes a change-over switch for connecting and disconnecting the disabling circuit 20 and the airbag ignition circuit 7. When the airbag ignition device 3 is made operable, the contact A of the change-over switch 5 is connected to the airbag ignition circuit. The ignition drive circuit 1 and the airbag ignition circuit 7 are connected to the contact B on the 7 side, and the disabling circuit 20 is shut off. Further, when the airbag ignition device 3 is deactivated, the contact A of the changeover switch 5 is connected to the contact C on the disabling circuit 20 side to connect the ignition driving circuit 1 and the disabling circuit 20 and the air. The bag ignition circuit 7 is shut off.
That is, at the time of such operation, the drive current for igniting the airbag flows to the disabling circuit 20 side. At this time, the drive current blows the fuse 4. For this reason, it is possible to detect that the change-over switch 5 has deactivated the airbag ignition device 3 by confirming that the fuse 4 has melted.
When the airbag ignition device 3 and the disabling circuit 20 are connected to the ignition drive circuit 1, the resistance 6 (resistance value Rs) of the airbag ignition device 3 is set so that the current value flowing through the airbag ignition device 3 becomes the same. In addition, the resistance value of the disable circuit 20 (resistance value Rd) and the resistance value of the fuse 4 (resistance value Rf) are set.

特開平８−２１６８２５号公報JP-A-8-216825

図３に示された特許文献１に開示されているような従来技術にあっては、前記無能化回路２０が、抵抗１３（抵抗値Ｒｄ）とヒューズ４（抵抗値Ｒｆ）とが直列に接続された構成となっているため、無能化回路２０に通電された全電流が前記ヒューズ４を流れることとなり、該ヒューズ４に耐静電特性が良好でないものを選定した場合には静電気の通電によってヒューズの溶断が発生し易くなる。   In the prior art disclosed in Patent Document 1 shown in FIG. 3, the disabling circuit 20 includes a resistor 13 (resistance value Rd) and a fuse 4 (resistance value Rf) connected in series. Therefore, the entire current supplied to the incapacitating circuit 20 flows through the fuse 4, and if the fuse 4 having a poor electrostatic resistance characteristic is selected, it is Fuse blows easily.

また、かかる従来技術にあっては、前記のように、無能化回路２０を抵抗１３とヒューズ４とが直列に接続された構成としたうえで、故障診断時等において、前記点火駆動回路１に接続したときにエアバッグ点火装置３と無能化回路２０両者を流れる電流値が同一になるように該エアバッグ点火装置３の抵抗６（抵抗値Ｒｓ）並びに無能化回路２０の抵抗１３（抵抗値Ｒｄ）及びヒューズ４（抵抗値Ｒｆ）の抵抗値を設定する必要がある。
さらに、エアバッグを点火させるだけの駆動電流が流された際には、該ヒューズ４も前記電流値で溶断する溶断特性を有するものを選定せざるを得ず、ヒューズの部品選定が制約される。 Further, in the prior art, as described above, the disabling circuit 20 is configured in such a manner that the resistor 13 and the fuse 4 are connected in series. The resistance 6 (resistance value Rs) of the airbag ignition device 3 and the resistance 13 (resistance value) of the disablement circuit 20 so that the current values flowing through both the airbag ignition device 3 and the disabling circuit 20 become the same when connected. Rd) and the resistance value of the fuse 4 (resistance value Rf) need to be set.
Further, when a driving current sufficient to ignite the airbag is supplied, the fuse 4 must be selected to have a fusing characteristic that blows at the current value, and the selection of fuse components is restricted. .

従って、本発明はかかる従来技術の課題に鑑み、無能化回路の接続時に静電気の通電によるヒューズの溶断の発生を回避して無能化回路の耐久性、信頼性を向上するとともに、ヒューズの選定の制約を無くして該ヒューズの部品選定を容易化したエアバッグの点火装置を提供することを目的とする。   Therefore, in view of the problems of the prior art, the present invention avoids the occurrence of fusing of the fuse due to the energization of static electricity when the disabled circuit is connected, and improves the durability and reliability of the disabled circuit, and the selection of the fuse. An object of the present invention is to provide an airbag ignition device that eliminates the restrictions and facilitates the selection of the fuse components.

本発明はかかる目的を達成するもので、点火駆動回路からの電流をエアバッグ点火回路を通してエアバッグの点火装置に流して該エアバッグを点火せしめるように構成するとともに、抵抗とヒューズとを備えた無能化回路を前記点火駆動回路に対してエアバッグ点火装置と並列に接続して、切換スイッチにて前記エアバッグの点火装置と前記無能化回路との作動を切換可能に構成してなるエアバッグの点火装置において、前記無能化回路は前記エアバッグ点火回路に対して並列に抵抗を２個直列に備えて、そのうちの１つの抵抗が前記ヒューズに対して並列に接続された並列回路を構成するとともに、他の１つの抵抗が前記並列回路に対して直列に接続されてなり、前記２個の抵抗値と前記ヒューズの抵抗値との合計が前記エアバッグ点火装置の抵抗値と同一になるように設定されることを特徴とする。
The present invention achieves such an object, and is configured to cause a current from an ignition drive circuit to flow through an airbag ignition circuit to an ignition device of the airbag to ignite the airbag, and includes a resistor and a fuse. An airbag in which a disabling circuit is connected to the ignition driving circuit in parallel with an airbag ignition device, and an operation of the ignition device of the airbag and the disabling circuit can be switched by a changeover switch. In the ignition device, the disabling circuit includes two resistors in series with the airbag ignition circuit in parallel, and one resistor of them is connected in parallel with the fuse. In addition, another resistor is connected in series to the parallel circuit, and the sum of the two resistance values and the resistance value of the fuse is the airbag ignition device. Characterized in that it is set to be equal to the resistance value of.

かかる発明によれば、点火駆動回路に対してエアバッグ点火装置と並列に接続してなる無能化回路を、ヒューズと前記抵抗とを並列に接続して構成し、好ましくは前記抵抗を２個備えて１つの抵抗を前記ヒューズに対して並列に接続した並列回路とし他の１つの抵抗を前記並列回路に対して直列に接続して構成したので、無能化回路の接続時に静電気がヒューズ及び該ヒューズと並列に設けられた抵抗に分流して流れることとなり、該ヒューズに流れる静電気の電流量が減少し、該静電気の通電によるヒューズの溶断の発生を回避できる。
また、かかる発明によれば、前記ヒューズと該ヒューズに対して並列に接続した抵抗からなる並列回路の該抵抗の抵抗値、好ましくは２つの抵抗のうちの１つの抵抗の抵抗値と前記並列回路に対して直列に接続された他の１つの抵抗の抵抗値とを調整すれば、ヒューズの部品選定に制約が無くなり、該ヒューズの部品選定が容易になる。 According to this invention, the disabling circuit formed by connecting the ignition driving circuit in parallel with the airbag ignition device is configured by connecting the fuse and the resistor in parallel, and preferably includes two resistors. Since one resistor is connected in parallel to the fuse and the other resistor is connected in series to the parallel circuit, static electricity is generated when the disabling circuit is connected. Therefore, the amount of static current flowing through the fuse is reduced, and the occurrence of fuse melting due to the electrification can be avoided.
Further, according to this invention, the resistance value of the parallel circuit comprising the fuse and a resistor connected in parallel to the fuse, preferably the resistance value of one of the two resistors and the parallel circuit If the resistance value of the other one resistor connected in series is adjusted, there is no restriction on the fuse part selection, and the fuse part selection becomes easy.

本発明によれば、無能化回路の接続時に静電気がヒューズ及び該ヒューズと並列に設けられた抵抗（第１の抵抗）に分流して流れることとなり、該ヒューズに流れる静電気の電流量が減少し、該静電気の通電によるヒューズの溶断の発生を回避でき、エアバッグ点火装置の耐久性、信頼性が向上する。
また、ヒューズに対して並列に接続した抵抗の抵抗値、好ましくは該抵抗の抵抗値と前記並列回路に対して直列に接続された抵抗の抵抗値とを調整すれば、ヒューズの部品選定に制約が無くなり、該ヒューズの部品選定が容易になる。 According to the present invention, when the disabling circuit is connected, static electricity is shunted and flows to the fuse and the resistor (first resistor) provided in parallel with the fuse, and the amount of static electricity flowing to the fuse is reduced. Therefore, it is possible to avoid the occurrence of fusing of the fuse due to the energization of static electricity, and the durability and reliability of the airbag ignition device are improved.
In addition, if the resistance value of the resistor connected in parallel to the fuse, preferably the resistance value of the resistor and the resistance value of the resistor connected in series to the parallel circuit are adjusted, the selection of the fuse components is restricted. This makes it easy to select parts for the fuse.

以下、本発明を図に示した実施例を用いて詳細に説明する。但し、この実施例に記載されている構成部品の寸法、材質、形状、その相対配置などは特に特定的な記載がない限り、この発明の範囲をそれのみに限定する趣旨ではなく、単なる説明例にすぎない。
図１は本発明の第１実施例に係る車両用エアバッグの点火装置の回路構成図、図２は本発明の第２実施例を示す図１対応図である。 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.
FIG. 1 is a circuit configuration diagram of an ignition device for a vehicle airbag according to a first embodiment of the present invention, and FIG. 2 is a diagram corresponding to FIG. 1 illustrating a second embodiment of the present invention.

本発明の第１実施例を示す図１において、３はエアバッグ点火装置、６は該点火装置３の抵抗（抵抗値Ｒｓ）である。１は前記エアバッグ点火装置３にエアバッグの駆動電流即ちエアバッグ点火装置３の点火電流を通電する点火駆動回路である。該点火駆動回路１と前記エアバッグ点火装置３との間にエアバッグ点火回路７を形成しており、該点火駆動回路１に設けられた電流制御装置によって前記エアバッグ点火装置３の通電量及び後述する無能化回路２０への通電量を制御している。   In FIG. 1 showing the first embodiment of the present invention, 3 is an airbag ignition device, and 6 is a resistance (resistance value Rs) of the ignition device 3. An ignition drive circuit 1 energizes the airbag ignition device 3 with an airbag drive current, that is, an ignition current of the airbag ignition device 3. An airbag ignition circuit 7 is formed between the ignition drive circuit 1 and the airbag ignition device 3, and a current control device provided in the ignition drive circuit 1 controls the amount of energization of the airbag ignition device 3. The energization amount to the disabling circuit 20 described later is controlled.

２は無能化回路２０を備えた無能化装置である。該無能化回路２０は、前記点火駆動回路１に対して前記エアバッグ点火装置３と並列に接続されている。また前記無能化回路２０は、２つの抵抗つまり第１の抵抗１０（抵抗値Ｒｈ）及び第２の抵抗１２（抵抗値Ｒｌ）を直列に接続し、前記第１の抵抗１０に対してエアバッグ点火装置３の故障診断等のテスト用抵抗としてのヒューズ４（抵抗値Ｒｆ）を並列に接続して構成されている。
５は前記無能化回路２０と前記エアバッグ点火回路７との接断を、後述する動作により行う切換スイッチである。 Reference numeral 2 denotes a disabling device including the disabling circuit 20. The disabling circuit 20 is connected to the ignition driving circuit 1 in parallel with the airbag ignition device 3. The disabling circuit 20 connects two resistors, that is, a first resistor 10 (resistance value Rh) and a second resistor 12 (resistance value Rl) in series, and the airbag is connected to the first resistor 10. A fuse 4 (resistance value Rf) is connected in parallel as a resistance for testing such as failure diagnosis of the ignition device 3.
Reference numeral 5 denotes a change-over switch that performs connection / disconnection between the disabling circuit 20 and the airbag ignition circuit 7 by an operation described later.

前記エアバッグ点火装置３と無能化回路２０とは、前記点火駆動回路１に接続したときに両者を流れる電流値が同一になるように、該エアバッグ点火装置３の抵抗６（抵抗値Ｒｓ）と前記無能化回路２０の第１の抵抗１０（抵抗値Ｒｈ）及び第２の抵抗１２（抵抗値Ｒｌ）及びヒューズ４（抵抗値Ｒｆ）の抵抗値を設定している。
即ち、かかる実施例においては、前記エアバッグ点火装置３の抵抗６（抵抗値Ｒｓ）と、前記無能化回路２０の第１の抵抗１０（抵抗値Ｒｈ）、第２の抵抗１２（抵抗値Ｒｌ）及びヒューズ４（抵抗値Ｒｆ）との関係を、次の式のように設定している。
Ｒｓ＝（Ｒｈ・Ｒｆ／（Ｒｈ＋Ｒｆ））＋Ｒｌ （１） When the airbag ignition device 3 and the disabling circuit 20 are connected to the ignition drive circuit 1, the resistance 6 (resistance value Rs) of the airbag ignition device 3 is set so that the current value flowing through the airbag ignition device 3 becomes the same. The resistance values of the first resistor 10 (resistance value Rh), the second resistor 12 (resistance value Rl), and the fuse 4 (resistance value Rf) of the disabling circuit 20 are set.
In other words, in this embodiment, the resistor 6 (resistance value Rs) of the airbag ignition device 3, the first resistor 10 (resistance value Rh), and the second resistor 12 (resistance value Rl) of the disabling circuit 20 are used. ) And fuse 4 (resistance value Rf) are set as in the following equation.
Rs = (Rh · Rf / (Rh + Rf)) + Rl (1)

かかる構成を備えたエアバッグの点火装置において、通常のエアバッグ作動状態つまりエアバッグ点火装置３を作動可能な状態にするときには、図１のように、前記切換スイッチ５の接点Ａをエアバッグ点火回路７側の接点Ｂに接続して前記点火駆動回路１とエアバッグ点火回路７とを接続するとともに無能化回路２０を遮断する。これにより、前記点火駆動回路１の電流制御装置によって通電量を制御されたエアバッグの駆動電流つまりエアバッグ点火装置３の点火電流がエアバッグ点火回路７を通してエアバッグ点火装置３に通電され、該エアバッグが作動可能な状態となる。   In the airbag ignition device having such a configuration, when the normal airbag operation state, that is, the airbag ignition device 3 is in an operable state, the contact A of the changeover switch 5 is connected to the airbag ignition as shown in FIG. The ignition driving circuit 1 and the airbag ignition circuit 7 are connected to the contact B on the circuit 7 side, and the disabling circuit 20 is shut off. As a result, the airbag drive current whose amount of current is controlled by the current control device of the ignition drive circuit 1, that is, the ignition current of the airbag ignition device 3, is supplied to the airbag ignition device 3 through the airbag ignition circuit 7. The airbag is ready for operation.

また、前記エアバッグ点火装置３の故障診断時等においてエアバッグ点火装置３を不作動とするときには、該切換スイッチ５の接点Ａを無能化回路２０側の接点Ｃに接続して前記点火駆動回路１と無能化回路２０とを接続するとともにエアバッグ点火回路７を遮断する。これにより、前記点火駆動回路１によって前記無能化回路２０に前記エアバッグ点火装置３の点火電流と同一値の電流が通電されるとともに、前記エアバッグ点火装置３への通電が遮断される。   Further, when the airbag ignition device 3 is inactivated at the time of failure diagnosis of the airbag ignition device 3, the contact A of the changeover switch 5 is connected to the contact C on the disabling circuit 20 side so that the ignition drive circuit 1 and the disabling circuit 20 are connected, and the airbag ignition circuit 7 is shut off. As a result, the ignition drive circuit 1 energizes the disabling circuit 20 with a current having the same value as the ignition current of the airbag ignition device 3 and interrupts the energization of the airbag ignition device 3.

図２に示す第２実施例においては、前記無能化回路２０を、第２の抵抗１２（抵抗値Ｒｌ）と前記ヒューズ４（抵抗値Ｒｆ）とを並列に接続した並列回路１１を構成するとともに、前記並列回路１１に直列に第１の抵抗１０（抵抗値Ｒｈ）を接続している。かかる第２実施例の作用も前記第１実施例と同様である。また図２の第２実施例において、その他の要素は前記第１実施例と同一であり、これと同一の要素は同一の符号で示す。   In the second embodiment shown in FIG. 2, the disabling circuit 20 includes a parallel circuit 11 in which a second resistor 12 (resistance value Rl) and the fuse 4 (resistance value Rf) are connected in parallel. The first resistor 10 (resistance value Rh) is connected in series to the parallel circuit 11. The operation of the second embodiment is the same as that of the first embodiment. In the second embodiment of FIG. 2, the other elements are the same as those of the first embodiment, and the same elements are denoted by the same reference numerals.

以上のように、かかる第１、第２実施例によれば、点火駆動回路１に対してエアバッグ点火装置３と並列に接続してなる無能化回路２０を、ヒューズ４と抵抗１０（あるいは抵抗１２）とを並列に接続して構成し、好ましくは前記抵抗を２個備えて第１の抵抗１０（あるいは第２の抵抗１２）を前記ヒューズ４に対して並列に接続した並列回路とし、第２の抵抗１２（あるいは第１の抵抗１０）を前記並列回路に対して直列に接続して構成したので、該無能化回路２０の接続時に静電気がヒューズ４及び該ヒューズ４と並列に設けられた第１の抵抗１０（あるいは第２の抵抗１２）に分流して流れることとなり、該ヒューズ４に流れる静電気の電流量が減少し、該静電気の通電によるヒューズの溶断の発生を回避できる。   As described above, according to the first and second embodiments, the disabling circuit 20 connected in parallel with the airbag ignition device 3 with respect to the ignition drive circuit 1 includes the fuse 4 and the resistor 10 (or the resistor 10). 12) are connected in parallel, and preferably a parallel circuit including the two resistors and connecting the first resistor 10 (or the second resistor 12) in parallel to the fuse 4, Since the two resistors 12 (or the first resistor 10) are connected in series to the parallel circuit, static electricity is provided in parallel with the fuse 4 and the fuse 4 when the disable circuit 20 is connected. The first resistor 10 (or the second resistor 12) is shunted and flows, so that the amount of static current flowing through the fuse 4 is reduced, and the occurrence of fusing of the fuse due to the electrification of the static electricity can be avoided.

また、かかる第１、第２実施例によれば、前記ヒューズ４と該ヒューズ４に対して並列に接続した第１の抵抗１０（あるいは第２の抵抗１２）からなる並列回路の該第１の抵抗１０（あるいは第２の抵抗１２）の抵抗値、好ましくは前記第１の抵抗１０の抵抗値Ｒｈ（あるいは第２の抵抗１２の抵抗値Ｒｌ）と前記並列回路に対して直列に接続された第２の抵抗の抵抗値Ｒｌ（あるいは第１の抵抗１０の抵抗値Ｒｈ）とを調整すれば、ヒューズ４の部品選定に制約が無くなり、該ヒューズ４の部品選定が容易になる。   Further, according to the first and second embodiments, the first of the parallel circuit including the fuse 4 and the first resistor 10 (or the second resistor 12) connected in parallel to the fuse 4 is used. The resistance value of the resistor 10 (or the second resistor 12), preferably the resistance value Rh of the first resistor 10 (or the resistance value Rl of the second resistor 12) and the parallel circuit are connected in series. If the resistance value Rl of the second resistor (or the resistance value Rh of the first resistor 10) is adjusted, there is no restriction on the component selection of the fuse 4, and the component selection of the fuse 4 is facilitated.

本発明によれば、無能化回路の接続時に静電気の通電によるヒューズの溶断の発生を回避することができて該無能化回路の耐久性、信頼性が向上するとともに、ヒューズの選定の制約が無くなって該ヒューズの部品選定が容易化できるエアバッグ装置を提供できる。   According to the present invention, it is possible to avoid the occurrence of fusing of the fuse due to the energization of static electricity when the disabling circuit is connected, thereby improving the durability and reliability of the disabling circuit and eliminating the restrictions on selecting the fuse. Thus, an airbag device capable of facilitating selection of the fuse parts can be provided.

本発明の第１実施例に係る車両用エアバッグの点火装置の回路構成図である。It is a circuit block diagram of the ignition device of the vehicle airbag which concerns on 1st Example of this invention. 本発明の第２実施例を示す図１対応図であるFIG. 3 is a view corresponding to FIG. 1 showing a second embodiment of the present invention. 従来技術を示す図１対応図である。It is a figure corresponding to FIG. 1 which shows a prior art.

符号の説明Explanation of symbols

１ 点火駆動回路
２ 無能化装置
３ エアバッグ点火装置
５ 切換スイッチ
６ 抵抗
１０ 抵抗（第１の抵抗）
１２ 抵抗（第２の抵抗）
２０ 無能化回路 DESCRIPTION OF SYMBOLS 1 Ignition drive circuit 2 Disabling device 3 Airbag ignition device 5 Changeover switch 6 Resistance 10 Resistance (1st resistance)
12 Resistance (second resistance)
20 Disabling circuit

Claims (1)

点火駆動回路からの電流をエアバッグ点火回路を通してエアバッグの点火装置に流して該エアバッグを点火せしめるように構成するとともに、抵抗とヒューズとを備えた無能化回路を前記点火駆動回路に対してエアバッグ点火装置と並列に接続して、切換スイッチにて前記エアバッグの点火装置と前記無能化回路との作動を切換可能に構成してなるエアバッグの点火装置において、
前記無能化回路は前記エアバッグ点火回路に対して並列に抵抗を２個直列に備えて、そのうちの１つの抵抗が前記ヒューズに対して並列に接続された並列回路を構成するとともに、他の１つの抵抗が前記並列回路に対して直列に接続されてなり、前記２個の抵抗値と前記ヒューズの抵抗値との合計が前記エアバッグ点火装置の抵抗値と同一になるように設定されることを特徴とするエアバッグの点火装置。 A current from the ignition drive circuit is made to flow through the airbag ignition circuit to the ignition device of the airbag to ignite the airbag, and a disabling circuit including a resistor and a fuse is provided for the ignition drive circuit. In the airbag ignition device that is connected in parallel with the airbag ignition device and configured to be able to switch the operation of the airbag ignition device and the disabling circuit with a changeover switch ,
The disabling circuit comprises two resistors in series with the airbag ignition circuit in parallel, one of which constitutes a parallel circuit connected in parallel with the fuse, and the other one Two resistors are connected in series to the parallel circuit, and the sum of the two resistance values and the resistance value of the fuse is set to be the same as the resistance value of the airbag ignition device. An ignition device for an airbag characterized by the above.
JP2004128534A 2004-04-23 2004-04-23 Air bag ignition device Expired - Fee Related JP4310743B2 (en)

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