JPH0825431B2 - Vehicle occupant protection device - Google Patents
Vehicle occupant protection deviceInfo
- Publication number
- JPH0825431B2 JPH0825431B2 JP2324788A JP32478890A JPH0825431B2 JP H0825431 B2 JPH0825431 B2 JP H0825431B2 JP 2324788 A JP2324788 A JP 2324788A JP 32478890 A JP32478890 A JP 32478890A JP H0825431 B2 JPH0825431 B2 JP H0825431B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- time
- protection device
- occupant protection
- output
- 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 - Lifetime
Links
Landscapes
- Automotive Seat Belt Assembly (AREA)
- Air Bags (AREA)
Description
この発明は、車両の衝突時に乗員を保護する車両用乗
員保護装置に関するものである。The present invention relates to a vehicle occupant protection device that protects an occupant in the event of a vehicle collision.
従来の車両用乗員保護装置としては、例えば特開昭49
−55031号公報に示すようなものがある。すなわち、こ
の公報のものは、加速度センサからの信号からある一定
以上の信号波形を取り出し、さらにその取り出した信号
波形を積分器および比較器に通し、その積分出力が所定
レベルを越えたときにワンショットよりなる駆動回路を
介して乗員保護装置本体である点火装置を駆動し、エア
バッグを膨張させたり、シートベルトを緊張させたりし
て乗員を保護していた。As a conventional vehicle occupant protection device, for example, Japanese Patent Laid-Open No.
There is one such as shown in Japanese Patent Publication No. 55031. That is, in this publication, a signal waveform of a certain level or more is extracted from the signal from the acceleration sensor, the extracted signal waveform is passed through an integrator and a comparator, and when the integrated output exceeds a predetermined level, The occupant is protected by driving the ignition device, which is the main body of the occupant protection device, via a drive circuit including shots to inflate the airbag and tension the seat belt.
【発明が解決しようとする課題】 しかしながら、このような従来の車両用乗員保護装置
にあっては、加速度センサからの出力信号波形を積分回
路により積分し、その積分波形のレベルから乗員が重大
に状態に至る衝突事故か否かを比較回路で判断してトリ
ガ信号により駆動回路を動作させる構成となっているも
のであって、積分回路が完全積分回路にあっては、加速
度センサの出力信号にオフセットやドリフト等のノイズ
があった場合、そのまま積分されてしまい、積分値に誤
差が生じて適確な時期にトリガ信号が発生しなかった
り、また長時間オフセットやドリフト等のノイズの発生
が続くと、衝突が発生しなくても積分値が所定レベル以
上になってしまい、これらを解決するためには複雑な信
号処理が必要となるという問題点があった。また、積分
回路が不完全積分回路であって、その時定数に対応する
時間を全て使用して積分すると、一次遅れ要素が入って
きて、線形に積分がなされないという問題点があった。 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、完全積分に近似できる範囲内で積分するよ
うにした車両用乗員保護装置を得ることを目的とする。However, in such a conventional vehicle occupant protection device, the output signal waveform from the acceleration sensor is integrated by an integrator circuit, and the occupant becomes serious from the level of the integrated waveform. It is configured to operate the drive circuit by the trigger signal by judging whether or not a collision accident leading to a state occurs, and when the integrating circuit is a perfect integrating circuit, the output signal of the acceleration sensor If there is noise such as offset or drift, it will be integrated as it is, an error will occur in the integrated value and the trigger signal will not be generated at the appropriate time, or noise such as offset or drift will continue to occur for a long time. Therefore, there is a problem that the integrated value becomes a predetermined level or more even if no collision occurs, and complicated signal processing is required to solve these. Further, when the integrating circuit is an incomplete integrating circuit and the integration is performed by using all the time corresponding to the time constant, there is a problem that a linear delay element is introduced and the integration is not performed linearly. The present invention has been made to solve the above problems, and an object of the present invention is to provide a vehicle occupant protection device that integrates within a range that can be approximated to complete integration.
すなわち、この発明に係る車両用乗員保護装置は、車
両の衝突時の加速度信号を検出する加速度センサと、こ
の加速度センサからの衝突検出波形に係わる加速度信号
を、衝突判断の限度である最大目標時間より十分に小さ
な不完全積分の時定数で設定されて、その範囲内で積分
して出力する積分回路と、この積分回路からの積分出力
が所定レベル以上か否かを判定し、所定レベルを越えた
ときトリガ信号を出力する比較回路と、この比較回路か
らのトリガ信号を受けて作動する乗員保護装置本体とを
備えたものであります。この発明はこれらの構成要素か
ら構成される。That is, the vehicle occupant protection system according to the present invention provides an acceleration sensor that detects an acceleration signal at the time of a vehicle collision and an acceleration signal related to a collision detection waveform from the acceleration sensor, which is a maximum target time that is a limit of collision determination. An integrator circuit that is set with a sufficiently smaller time constant for incomplete integration and that integrates and outputs within that range, and whether or not the integrated output from this integrator circuit is above a specified level is determined, and the specified level is exceeded. It is equipped with a comparison circuit that outputs a trigger signal when it is activated, and an occupant protection device that operates by receiving the trigger signal from this comparison circuit. The invention consists of these components.
この発明における車両用乗員保護装置は、車両の衝突
時の加速度波形から乗員が身体の一部をステアリングな
どに打ちつけるまでの時間を正確に予測して確実に乗員
保護装置本体を作動させるようにしたものである。The occupant protection device for a vehicle according to the present invention is configured to accurately predict the time until the occupant hits a part of the body on the steering wheel or the like from the acceleration waveform at the time of the collision of the vehicle, and reliably operates the occupant protection device main body. It is a thing.
以下、この発明を図面に基づいて詳細に説明する。 第２図はこの発明の一実施例を示すブロック図で、第
２図において第１図と同一または均等な成部分には同一
符号を付して重複説明を省略する。 まず構成を説明すると、第１図における積分回路２は
第１不完全積分回路2aと第２不完全積分回路2bとよりな
り、第１不完全積分回路2aは定数T1を有し、車両の衝突
等による加速度の変化を検出する加速度センサ１から出
力されるアナログ信号を積分するものである。また、第
２不完全積分回路2bは第１不完全積分回路2aと同一機能
を有し、第１不完全積分回路2aからの不完全積分出力を
再度不完全積分する。そして、上記第２不完全積分回路
2bの時定数T2は第１不完全積分回路2aの時定数T1と同一
であっても異なっていてもよい。上記第１および第２不
完全積分回路2a,2bは完全積分に近似できる範囲内で積
分して出力するもので、第１及び第２不完全積分回路2
a,2bの夫々の時定数T1,T2は例えば後述の乗員保護装置
本体の最大目標作動時間（衝突が発生してからエアバッ
グが完全に膨張するまでの時間）Ｔの10倍に設定されて
いる。３は加速度センサ１の検出出力に第１係数を付加
する第１減衰器からなる第１係数回路、４は減衰率がＫ
である第２減衰器からなる第２係数回路で、この第２係
数回路４は第１不完全積分回路2aの積分出力に第２係数
を付加する。そして、上記第１係数回路３の減衰率は第
２係数回路４の減衰率Ｋの２乗の1/2である。なお、上
記減衰率Ｋは後述の点火装置８に点火電流が供給されて
からエアバッグの膨張が完了するまでに必要な時間tdに
等しい。５は加算回路で、この加算回路５は上記第２不
完全積分回路2b,第１係数回路３および第２係数回路４
のそれぞれからの出力を加算してその結果を出力するも
のである。比較回路６は加算回路５からの加算出力が所
定レベル以上か否か判定し、所定レベルを越えたときト
リガ信号を出力するものである。駆動回路７は比較回路
６からのトリガ信号を受けて、一定パルス幅の駆動信号
を出力するものである。乗員保護装置本体である点火装
置８は上記駆動回路７からの駆動信号を受けて例えばエ
アバッグを作動するものである。 次に動作について説明する。 車両の走行に伴って車両には種々の加速度が作用す
る。いま、車両が一定速度で走行しているときに例えば
衝突により、車両の前後方向に加速度ａ（ｔ）が発生
し、その加速度ａ（ｔ）が加速度センサ１によって検出
されると、乗員の頭は一定速度で投げ出される一方で、
そのときの加速度ａ（ｔ）は乗員にも作用する。それに
よって、頭は車両に対してある相対速度、すなわちＶ
（ｔ）（＝∫ａ（ｔ）dt）で動き出す。一方、そのとき
の加速度センサ１の出力ａ（ｔ）は第１不完全積分回路
2aで積分され、積分波形の完全積分に近似できる範囲内
での時定数T1で積分して出力する。また、頭は動き出す
ことによって衝突直前の位置を初期位置とした場合、そ
の位置から時間経過に伴ってｘ（ｔ）（＝∫Ｖ（ｔ）d
t）だけ前に変位する。この変位ｘ（ｔ）は第２不完全
積分回路2bによって第１不完全積分回路2aの出力が積分
され、積分波形の直線範囲の積分時定数を積分値として
出力して実時間における乗員の頭の変位量ｘ（ｔ）が算
出される。次に、第１不完全積分回路2aの出力Ｖ（ｔ）
は第２係数回路４によってtdが重み付けされ、Ｖ（ｔ）
×td、すなわち時刻td時間内に変位する量が求められ
る。さらに、加速度センサ１の出力ａ（ｔ）は第１係数
回路３によって1/2t2 dだけ重み付けされ、1/2a（ｔ）×
t2 d、すなわち時刻td時間内に変位する量が求められ
る。これらの出力は加算回路５によって加算され、 ｘ（ｔ）＋Ｖ（ｔ）×td＋1/2a（ｔ）×t2 d が求められる。すなわち、これは現時点ｔからtd時間後
における乗員の頭の位置の予測値ｘ（ｔ＋td）である。
この予測値ｘ（ｔ＋td）は比較回路６に供給され、第２
図において乗員の頭の位置が初期位置０から予測値ｘ
（ｔ＋td）が比較回路６の閾値ｘを越えたとき駆動回路
７により駆動信号を乗員保護装置本体８の点火装置に点
火電流を供給し、エアバッグ等を作動させ、乗員を保護
する。 第４図はこの発明による車両用乗員保護装置を具体化
した一回路図を示し、前記第２図と同一部分に同一符号
を付したもので、９は第１不完全積分回路2aの出力が入
力に対し極性反転されるため、これを再度極性反転して
第２不完全積分回路2bに入力するために設けた極性反転
回路である。 この第４図において、第２係数回路４は入力に対して
１をかけて出力するように設定している。Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 2 is a block diagram showing an embodiment of the present invention. In FIG. 2, the same or equivalent components as in FIG. First, the configuration will be described. The integrator circuit 2 in FIG. 1 is composed of a first incomplete integrator circuit 2a and a second incomplete integrator circuit 2b. The first incomplete integrator circuit 2a has a constant T 1 and It integrates an analog signal output from the acceleration sensor 1 that detects a change in acceleration due to a collision or the like. The second incomplete integration circuit 2b has the same function as the first incomplete integration circuit 2a, and again incompletely integrates the incomplete integration output from the first incomplete integration circuit 2a. And the second incomplete integration circuit
The time constant T 2 of 2b may be the same as or different from the time constant T 1 of the first incomplete integration circuit 2a. The first and second incomplete integration circuits 2a and 2b are integrated and output within a range that can be approximated to complete integration.
The respective time constants T 1 and T 2 of a and 2b are set to, for example, 10 times the maximum target operating time (time from the occurrence of a collision to the time when the airbag is completely inflated) T of the occupant protection device body described later. Has been done. Reference numeral 3 is a first coefficient circuit including a first attenuator for adding a first coefficient to the detection output of the acceleration sensor 1, and 4 is an attenuation factor K.
In the second coefficient circuit including the second attenuator, the second coefficient circuit 4 adds the second coefficient to the integrated output of the first incomplete integration circuit 2a. The attenuation rate of the first coefficient circuit 3 is half the square of the attenuation rate K of the second coefficient circuit 4. The damping rate K is equal to the time t d required after the ignition current is supplied to the ignition device 8 to be described later until the inflation of the airbag is completed. Reference numeral 5 denotes an adder circuit, and the adder circuit 5 includes the second incomplete integration circuit 2b, the first coefficient circuit 3 and the second coefficient circuit 4 described above.
The output from each of the above is added and the result is output. The comparison circuit 6 determines whether the addition output from the addition circuit 5 is equal to or higher than a predetermined level, and outputs a trigger signal when the addition output exceeds the predetermined level. The drive circuit 7 receives the trigger signal from the comparison circuit 6 and outputs a drive signal having a constant pulse width. The ignition device 8, which is the main body of the occupant protection device, receives a drive signal from the drive circuit 7 and operates, for example, an airbag. Next, the operation will be described. Various accelerations act on the vehicle as the vehicle travels. Now, when the vehicle is traveling at a constant speed, an acceleration a (t) is generated in the front-rear direction of the vehicle due to, for example, a collision, and when the acceleration a (t) is detected by the acceleration sensor 1, the head of the occupant is detected. While being thrown at a constant speed,
The acceleration a (t) at that time also acts on the occupant. Thereby, the head has a certain relative speed with respect to the vehicle, that is, V
It starts to move at (t) (= ∫a (t) dt). On the other hand, the output a (t) of the acceleration sensor 1 at that time is the first incomplete integration circuit.
It is integrated in 2a, integrated with the time constant T 1 within the range that can be approximated to the complete integration of the integrated waveform, and output. When the position immediately before the collision is set as the initial position by moving the head, x (t) (= ∫V (t) d
Displaces t) forward. This displacement x (t) is integrated with the output of the first incomplete integrator circuit 2a by the second incomplete integrator circuit 2b, and the integrated time constant in the linear range of the integrated waveform is output as an integrated value to obtain the head of the occupant in real time. The displacement amount x (t) of is calculated. Next, the output V (t) of the first incomplete integration circuit 2a
Is weighted by t d by the second coefficient circuit 4, and V (t)
× t d , that is, the amount of displacement within the time t d is obtained. Further, the output a (t) of the acceleration sensor 1 is weighted by 1 / 2t 2 d by the first coefficient circuit 3, and 1 / 2a (t) ×
t 2 d , that is, the amount of displacement within the time t d is obtained. These outputs are added by the adder circuit 5 to obtain x (t) + V (t) × t d + 1 / 2a (t) × t 2 d . That is, this is the predicted value x (t + t d ) of the position of the occupant's head at time t d after the present time t.
This predicted value x (t + t d ) is supplied to the comparison circuit 6 and the second
In the figure, the position of the occupant's head is the predicted value x from the initial position 0.
When (t + t d ) exceeds the threshold value x of the comparison circuit 6, a drive signal is supplied from the drive circuit 7 to the ignition device of the occupant protection device main body 8 to activate an airbag or the like to protect the occupant. FIG. 4 shows a circuit diagram embodying the vehicle occupant protection system according to the present invention, in which the same parts as those in FIG. 2 are designated by the same reference numerals, and 9 indicates the output of the first incomplete integration circuit 2a. Since the polarity is inverted with respect to the input, the polarity inversion circuit is provided to invert the polarity again and input it to the second incomplete integration circuit 2b. In FIG. 4, the second coefficient circuit 4 is set to multiply the input by 1 and output.
以上説明してきたように、この発明によれば、加速度
センサからの加速度信号を、衝突判断の限度である最大
目標時間より十分に小さな不完全積分の時定数で設定さ
れて、その範囲内で積分して出力する積分回路と、乗員
保護装置本体にトリガ信号が供給されてから作動が完了
するまでの必要な時間に基づいた係数を上記加速度セン
サからの加速度信号及び上記積分回路からの積分出力に
重み付けして出力する係数回路と、上記積分回路からの
積分出力と上記係数回路からの重み付けされた出力とを
加えて乗員位置の予測値を出力する加算回路と、この加
算回路からの乗員位置の予測値が所定レベル以上か否か
を判定し、所定レベルを越えたときトリガ信号を上記乗
員保護装置本体に出力する比較回路とを備えた車両用乗
員保護装置としたため、車両の衝突時の加速度波形が線
形積分されるので、加速度波形が精度よく積分され、乗
員の身体の一部がステアリングなどに打ちつけられるま
での時間を正確に予測し、かつ、複雑な処理をすること
なく、加速度センサからの出力誤差の悪影響を減少し、
確実に乗員保護装置本体を作動できるという効果が得ら
れる。As described above, according to the present invention, the acceleration signal from the acceleration sensor is set with the time constant of incomplete integration that is sufficiently smaller than the maximum target time that is the limit of collision determination, and integrated within that range. And an integrating circuit that outputs the trigger signal to the body of the occupant protection device and a coefficient based on the time required from the completion of the operation to the acceleration signal from the acceleration sensor and the integrated output from the integrating circuit. A coefficient circuit for weighting and outputting, an adding circuit for adding the integrated output from the integrating circuit and the weighted output from the coefficient circuit, and outputting the predicted value of the occupant position, and the occupant position from the adding circuit. The vehicle occupant protection device is provided with a comparison circuit that determines whether the predicted value is equal to or higher than a predetermined level, and outputs a trigger signal to the occupant protection device body when the predetermined value is exceeded. Since the acceleration waveform at the time of a vehicle collision is linearly integrated, the acceleration waveform is accurately integrated to accurately predict the time until a part of the occupant's body is hit on the steering wheel, etc. Reduce the adverse effects of the output error from the acceleration sensor,
The effect that the occupant protection device main body can be reliably operated is obtained.
第１図はこの発明による車両用乗員保護装置を示すクレ
ーム対応図、第２図はこの発明に係る車両用乗員保護装
置の一実施例を示すブロック図、第３図は衝突時の加速
度センサの出力波形を積分したときの積分波形図、第４
図はこの発明の一実施例を具体化した回路図である。 １……加速度センサ、２……積分回路、６……比較回
路、７……駆動回路、８……乗員保護装置本体。 なお、図中、同一符号は同一または相当部分を示す。1 is a block diagram showing a vehicle occupant protection device according to the present invention, FIG. 2 is a block diagram showing an embodiment of a vehicle occupant protection device according to the present invention, and FIG. 3 is an acceleration sensor at the time of collision. Integrated waveform diagram when the output waveform is integrated, 4th
The drawing is a circuit diagram embodying an embodiment of the present invention. 1 ... Acceleration sensor, 2 ... Integration circuit, 6 ... Comparison circuit, 7 ... Drive circuit, 8 ... Occupant protection device body. In the drawings, the same reference numerals indicate the same or corresponding parts.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 斉藤 泰男 埼玉県大宮市日進町２丁目1910番地 関東 精器株式会社内 (72)発明者 大根田 克司 埼玉県大宮市日進町２丁目1910番地 関東 精器株式会社内 (56)参考文献 特開 昭49−55031（ＪＰ，Ａ) 国際公開90／9298（ＷＯ，Ａ) 制御工学ハンドブック編集委員編「制御 工学ハンドブック」昭39．７月29日、株式 会社朝倉書店、Ｐ．122 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Saito 2-1910 Nisshin-cho, Omiya-shi, Saitama Kanto Seiki Co., Ltd. (72) Inventor Katsushi Oneda 2-1910 Nisshin-cho, Omiya-shi, Saitama Kanto Seiki Co., Ltd. (56) References Japanese Patent Laid-Open No. 49-55031 (JP, A) International Publication 90/9298 (WO, A) "Control Engineering Handbook" edited by Editorial Committee for Control Engineering Handbook 39.7 July 29, stock company Asakura Shoten, P. 122
Claims (1)
度センサと、この加速度センサからの加速度信号を、衝
突判断の限度である最大目標時間より十分に小さな不完
全積分の時定数で設定され、その範囲内で積分して出力
する積分回路と、乗員保護装置本体にトリガ信号が供給
されてから作動が完了するまでの必要な時間に基づいた
係数を上記加速度センサからの加速度信号及び上記積分
回路からの積分出力に重み付けして出力する係数回路
と、上記積分回路からの積分出力と上記係数回路からの
重み付けされた出力とを加えて乗員位置の予測値を出力
する加算回路と、この加算回路からの乗員位置の予測値
が所定レベル以上か否かを判定し、所定レベルを越えた
ときトリガ信号を上記乗員保護装置本体に出力する比較
回路とを備えた車両用乗員保護装置。1. An acceleration sensor for detecting an acceleration signal at the time of collision of a vehicle, and an acceleration signal from the acceleration sensor is set with a time constant of incomplete integration sufficiently smaller than a maximum target time which is a limit of collision judgment. , An integrating circuit for integrating and outputting within the range, and a coefficient based on the time required from the time the trigger signal is supplied to the occupant protection device main body until the operation is completed, the acceleration signal from the acceleration sensor and the integration A coefficient circuit for weighting and outputting the integrated output from the circuit, an adding circuit for adding the integrated output from the integrating circuit and the weighted output from the coefficient circuit, and outputting a predicted value of the occupant position, and this addition A vehicle provided with a comparison circuit for judging whether or not the predicted value of the occupant position from the circuit is above a predetermined level and outputting a trigger signal to the main body of the occupant protection device when the predicted value exceeds the predetermined level. Occupant protection device.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2324788A JPH0825431B2 (en) | 1990-11-27 | 1990-11-27 | Vehicle occupant protection device |
| DE4128230A DE4128230C2 (en) | 1990-08-24 | 1991-08-26 | Control system for an airbag installed in a motor vehicle |
| US08/311,741 US5787377A (en) | 1990-08-24 | 1994-09-23 | Air-bag control circuit |
| US09/064,850 US6125313A (en) | 1990-08-24 | 1998-04-23 | Air-bag control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2324788A JPH0825431B2 (en) | 1990-11-27 | 1990-11-27 | Vehicle occupant protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04191144A JPH04191144A (en) | 1992-07-09 |
| JPH0825431B2 true JPH0825431B2 (en) | 1996-03-13 |
Family
ID=18169685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2324788A Expired - Lifetime JPH0825431B2 (en) | 1990-08-24 | 1990-11-27 | Vehicle occupant protection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0825431B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2964796B2 (en) * | 1992-09-28 | 1999-10-18 | 日産自動車株式会社 | Control device for occupant restraint system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2222038C3 (en) * | 1972-05-05 | 1978-07-06 | Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen | Test circuit for the triggering device of a safety device used to protect the occupants of a vehicle during an accident |
| JP2543839B2 (en) * | 1990-01-29 | 1996-10-16 | センサー・テクノロジー株式会社 | Collision sensor |
-
1990
- 1990-11-27 JP JP2324788A patent/JPH0825431B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| 制御工学ハンドブック編集委員編「制御工学ハンドブック」昭３９．７月２９日、株式会社朝倉書店、Ｐ．１２２ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04191144A (en) | 1992-07-09 |
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