JPH0710657B2 - Vehicle occupant protection device - Google Patents
Vehicle occupant protection deviceInfo
- Publication number
- JPH0710657B2 JPH0710657B2 JP2264650A JP26465090A JPH0710657B2 JP H0710657 B2 JPH0710657 B2 JP H0710657B2 JP 2264650 A JP2264650 A JP 2264650A JP 26465090 A JP26465090 A JP 26465090A JP H0710657 B2 JPH0710657 B2 JP H0710657B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- threshold
- occupant protection
- protection device
- 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
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- Air Bags (AREA)
Description
この発明は車両の塔乗者を衝突事故から安全に保護する
車両用乗員保護装置に関する。The present invention relates to a vehicle occupant protection device for safely protecting a vehicle occupant from a collision accident.
【従来の技術】 従来の車両用乗員保護装置としては、例えば第２図に示
すようなものがある。図において、１は衝突検出信号を
出力する加速度センサ、２は加速度センサ１からの信号
を積分する積分回路、３は積分回路２の出力信号が供給
される閾値回路で、この閾値回路３は積分回路２の出力
信号が所定レベルの閾値を越えたときにパルスを送出す
る。４は単安定素子41とオア素子42とで構成される最小
応動時間設定手段で、この最小応動時間設定手段４は供
給される閾値回路３の出力信号は一方では単安定素子41
に供給され、他方ではオア素子42の一方の入力端子に供
給される。また、単安定素子41の出力信号はオア素子42
の他方の入力端子に供給され、その出力信号は例えばエ
アバッグ装置の点火装置である乗員保護装置本体（図示
せず）に供給される。 次に動作について説明する。 加速度センサ１が衝突を検出することにより加速度信号
が積分回路２に供給されて加速度信号を積分する。積分
回路２の出力信号は閾値回路３に供給され、この閾値回
路３は積分回路２の出力信号所定レベルの閾値を越える
と、出力パルスを送出する。しかして、閾値回路３より
の出力パルスによって単安定素子41はトリガされるの
で、閾値回路３の出力パルスが短い場合でも単安定素子
41の出力信号が乗員保護装置本体を駆動させることがで
きる。2. Description of the Related Art A conventional vehicle occupant protection device is, for example, one shown in FIG. In the figure, 1 is an acceleration sensor that outputs a collision detection signal, 2 is an integrating circuit that integrates the signal from the acceleration sensor 1, and 3 is a threshold circuit to which the output signal of the integrating circuit 2 is supplied. A pulse is emitted when the output signal of the circuit 2 exceeds a threshold value of a predetermined level. Reference numeral 4 is a minimum response time setting means composed of a monostable element 41 and an OR element 42. The minimum response time setting means 4 is supplied with the output signal of the threshold circuit 3 on the one hand.
, And the other is supplied to one input terminal of the OR element 42. The output signal of the monostable element 41 is the OR element 42.
Is supplied to the other input terminal of, and its output signal is supplied to, for example, an occupant protection device main body (not shown) which is an ignition device of an airbag device. Next, the operation will be described. When the acceleration sensor 1 detects a collision, the acceleration signal is supplied to the integrating circuit 2 to integrate the acceleration signal. The output signal of the integrating circuit 2 is supplied to the threshold circuit 3, and the threshold circuit 3 outputs an output pulse when the output signal of the integrating circuit 2 exceeds a threshold value of a predetermined level. Then, since the monostable element 41 is triggered by the output pulse from the threshold circuit 3, even if the output pulse of the threshold circuit 3 is short, the monostable element 41 is
The output signal of 41 can drive the body of the occupant protection device.
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、閾値回路３のトリガ信号は単安定素子41とオ
ア素子42とからなる最小応動時間設定手段４を介して乗
員保護装置本体に供給される構成であるため、悪路走行
時などに加速度センサ１が検出する瞬時に消失してしま
う単発的な加速度信号により閾値回路３よりトリガ信号
が発生すると、単安定素子41が動作して乗員保護装置本
体が誤動作してしまう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、加速度センサが検出した極めて短い単発的な
加速度信号により閾値回路がトリガ信号を出力しても乗
員保護装置本体を誤動作させない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 trigger signal of the threshold circuit 3 is supplied to the occupant protection device main body through the minimum response time setting means 4 including the monostable element 41 and the OR element 42. Therefore, when a trigger signal is generated from the threshold circuit 3 by a single acceleration signal that is instantly detected by the acceleration sensor 1 when traveling on a rough road, the monostable element 41 operates and the occupant operates. There is a problem that the protective device body malfunctions. The present invention has been made to solve the above problems, and prevents the occupant protection device from malfunctioning even if the threshold circuit outputs a trigger signal due to an extremely short single-shot acceleration signal detected by the acceleration sensor. It is an object of the present invention to obtain a vehicle occupant protection device.
この発明に係る車両用乗員保護装置は、加速度センサか
らの衝突検出波形に係る加速度信号を積分する積分回路
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
する閾値回路と、この閾値回路からのトリガ信号を所定
時間保持し、その時間内は乗員保護装置本体を駆動する
信号を出力する単安定マルチバイブレータと上記閾値回
路の閾値を閾値回路の出力の微分値に応じて変化させる
微分回路とからなるものである。The vehicle occupant protection system according to the present invention determines whether a predetermined level or more is determined by an integration circuit that integrates the acceleration signal related to the collision detection waveform from the acceleration sensor, and the integrated output from the integration circuit. A threshold circuit that outputs a trigger signal when it exceeds, and a monostable multivibrator that holds the trigger signal from this threshold circuit for a predetermined time and outputs a signal that drives the occupant protection device main body and the threshold value of the above threshold circuit And a differentiating circuit that changes according to the differential value of the output of the threshold circuit.
この発明における車両用乗員保護装置は、閾値回路の閾
値を閾値回路の出力の微分値に応じて変化させるように
したので、瞬時に消失してしまう単発的な加速度信号で
は単安定マルチバイブレータを立ち上げることはでき
ず、所定時間継続する加速度信号により単安定マルチバ
イブレータを動作させるようにして動作の確実性を確保
したものである。Since the vehicle occupant protection device according to the present invention changes the threshold value of the threshold circuit according to the differential value of the output of the threshold circuit, the monostable multivibrator is activated in the case of a sporadic acceleration signal that disappears instantaneously. The monostable multivibrator is operated by an acceleration signal that cannot be raised for a predetermined period of time to ensure the reliability of the operation.
以下、この発明を図面に基づいて詳細に説明する。 第１図はこの発明の一実施例を示すブロック図で、第１
図において第２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。 まず構成を説明すると、図において、５は閾値回路３か
らの出力信号を所定時間遅延させる積分素子からなる遅
延回路、６は遅延回路５を受け、一定パルス幅のパルス
を出力し、出力パルスの発生時間内に乗員保護装置本体
（図示せず）に通電する信号を出力する単安定マルチバ
イブレータ、７は単安定マルチバイブレータ６の出力信
号を増幅する増幅器、８は閾値回路３からの出力を微分
する微分回路で、この微分回路８はその微分値により閾
値回路３の閾値を変化する。 次に動作について説明する。 加速度センサ１の出力信号は積分回路２に供給され、微
分回路８の出力信号は閾値回路３に供給される。ここ
で、閾値回路３に供給された信号が所定レベルの閾値を
越えると、出力信号を出力し、その出力信号は所定時間
遅延回路５で遅延させられた後、単安定マルチバイブレ
ータ６に入力される。また、その出力信号は微分回路８
に入力される。そして、この微分回路８において閾値回
路３の出力を微分し、その微分値に応じて閾値回路３の
閾値を変化させる。 いま、加速度センサ１により検出される加速度信号が例
えば、悪路走行中に生じる瞬時に消失してしまうような
単発的な所定レベルを越えた信号であると、この信号は
閾値回路３の閾値を越えることにより閾値回路３はトリ
ガ信号を出力するようになる。このトリガ信号は微分回
路８により微分され、その微分値に応じて閾値回路３の
閾値を変化させる。上述のような場合のトリガ信号は遅
延回路５を介して単安定マルチバイブレータ６に供給さ
れるので、閾値回路３では新たな閾値に基づいて上記加
速度センサ１のレベルが判定され、レベルが小さくなっ
たときには閾値回路３よりのトリガ信号が消失している
ために単安定マルチバイブレータ６は動作せず、よって
乗員保護装置本体が誤動作することがなくなる。 また、閾値回路３のトリガ信号が車両の衝突に基づいて
発生する所定の時間継続するような信号であると、閾値
回路３よりのトリガ信号は微分回路８により微分され、
閾値回路３の閾値を変化させる。そして、新たな閾値に
より加速度信号のレベルが判定され、閾値回路３よりの
トリガ信号は単安定マルチバイブレータ６を立ち上げる
のに充分な時間継続して供給されることにより所定巾の
出力パルスが増幅器７に入力されて電力増幅される。そ
して、増幅器７よりの出力信号により乗員保護装置本体
が確実に動作して乗員を安全に保護することになる。Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.
In the figure, the same or equivalent components as in FIG. First, the configuration will be described. In the figure, 5 is a delay circuit composed of an integrating element for delaying an output signal from the threshold circuit 3 for a predetermined time, 6 is a delay circuit 5, outputs a pulse having a constant pulse width, and outputs the output pulse. A monostable multivibrator that outputs a signal for energizing an occupant protection device main body (not shown) within the generation time, an amplifier 7 that amplifies the output signal of the monostable multivibrator 6, and a derivative 8 of the output from the threshold circuit 3. The differentiating circuit 8 changes the threshold value of the threshold value circuit 3 according to the differential value. Next, the operation will be described. The output signal of the acceleration sensor 1 is supplied to the integrating circuit 2, and the output signal of the differentiating circuit 8 is supplied to the threshold circuit 3. Here, when the signal supplied to the threshold circuit 3 exceeds a threshold value of a predetermined level, an output signal is output, and the output signal is delayed by the delay circuit 5 for a predetermined time and then input to the monostable multivibrator 6. It Also, the output signal is the differentiation circuit 8
Entered in. Then, the output of the threshold circuit 3 is differentiated in the differentiating circuit 8 and the threshold value of the threshold circuit 3 is changed according to the differentiated value. Now, if the acceleration signal detected by the acceleration sensor 1 is, for example, a signal that exceeds a predetermined level that is sporadically disappeared during traveling on a rough road, this signal may exceed the threshold value of the threshold circuit 3. When it exceeds the threshold value, the threshold circuit 3 comes to output a trigger signal. This trigger signal is differentiated by the differentiating circuit 8 and the threshold value of the threshold circuit 3 is changed according to the differentiated value. Since the trigger signal in the above case is supplied to the monostable multivibrator 6 via the delay circuit 5, the threshold circuit 3 determines the level of the acceleration sensor 1 based on the new threshold value, and the level becomes small. In this case, the monostable multivibrator 6 does not operate because the trigger signal from the threshold circuit 3 has disappeared, and thus the occupant protection device main body does not malfunction. Further, when the trigger signal of the threshold circuit 3 is a signal which is generated based on the collision of the vehicle and continues for a predetermined time, the trigger signal from the threshold circuit 3 is differentiated by the differentiating circuit 8,
The threshold of the threshold circuit 3 is changed. Then, the level of the acceleration signal is determined by the new threshold value, and the trigger signal from the threshold value circuit 3 is continuously supplied for a sufficient time to start up the monostable multivibrator 6, whereby an output pulse of a predetermined width is amplified. It is input to 7 and the power is amplified. Then, the occupant protection device body operates reliably by the output signal from the amplifier 7 to protect the occupant safely.
以上説明してきたようにこの発明によれば、その構成を
加速度センサからの衝突検出波形に係る加速度信号を積
分する積分回路と、この積分回路からの微分出力が所定
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閾値回路と、この閾値回路からのト
リガ信号を所定時間保持し、その時間内は乗員保護装置
本体を駆動する信号を出力する単安定マルチバイブレー
タと、上記閾値回路の閾値を閾値回路の出力の微分値に
応じて変化させる微分回路とを備えた車両用乗員保護装
置としたため、加速度センサが検出した瞬時に消失して
しまうような極めて短い単発的な加速度信号による乗員
保護装置本体を誤動作させないという効果が得られる。As described above, according to the present invention, it is determined whether or not the configuration has an integrating circuit that integrates the acceleration signal related to the collision detection waveform from the acceleration sensor and the differential output from the integrating circuit is equal to or higher than a predetermined level. , A threshold circuit that outputs a trigger signal when a predetermined level is exceeded, and a monostable multivibrator that holds the trigger signal from this threshold circuit for a predetermined time and outputs a signal that drives the passenger protection device body within that time, Since the vehicle occupant protection device is provided with the differentiating circuit that changes the threshold value of the threshold circuit according to the differential value of the output of the threshold circuit, it is extremely short and one-shot that disappears at the moment when the acceleration sensor detects it. The effect that the occupant protection device main body does not malfunction due to the acceleration signal is obtained.
第１図はこの発明の一実施例による車両用乗員保護装置
を示すブロック図、第２図は従来の車両用乗員保護装置
の一例を示すブロック図である。 ２……微分回路、３……閾値回路、５……単安定マルチ
バイブレータ、７……微分回路。FIG. 1 is a block diagram showing a vehicle occupant protection system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional vehicle occupant protection system. 2 ... Differentiation circuit, 3 ... Threshold circuit, 5 ... Monostable multivibrator, 7 ... Differentiation circuit.
Claims (1)
係る加速度信号を積分する積分回路（２）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閾値回路
（３）と、この閾値回路からのトリガ信号を所定時間保
持し、その時間内は乗員保護装置本体を駆動する信号を
出力する単安定マルチバイブレータ（５）と、上記閾値
回路の閾値を閾値回路の出力の微分値に応じて変化させ
る微分回路（７）とを備えた車両用乗員保護装置。1. An integrating circuit (2) for integrating an acceleration signal related to a collision detection waveform from an acceleration sensor (1), and determining whether or not an integrated output from the integrating circuit is at a predetermined level or more,
A threshold circuit (3) that outputs a trigger signal when the level exceeds a predetermined level, and a monostable multivibrator that holds the trigger signal from the threshold circuit for a predetermined time and outputs a signal for driving the body of the occupant protection device during the time. A vehicle occupant protection device comprising: (5); and a differentiation circuit (7) that changes the threshold value of the threshold circuit according to the differential value of the output of the threshold circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2264650A JPH0710657B2 (en) | 1990-10-02 | 1990-10-02 | Vehicle occupant protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2264650A JPH0710657B2 (en) | 1990-10-02 | 1990-10-02 | Vehicle occupant protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04143147A JPH04143147A (en) | 1992-05-18 |
| JPH0710657B2 true JPH0710657B2 (en) | 1995-02-08 |
Family
ID=17406303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2264650A Expired - Lifetime JPH0710657B2 (en) | 1990-10-02 | 1990-10-02 | Vehicle occupant protection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0710657B2 (en) |
-
1990
- 1990-10-02 JP JP2264650A patent/JPH0710657B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04143147A (en) | 1992-05-18 |
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