JPH0789123B2 - Sensor system for safety devices - Google Patents
Sensor system for safety devicesInfo
- Publication number
- JPH0789123B2 JPH0789123B2 JP62111768A JP11176887A JPH0789123B2 JP H0789123 B2 JPH0789123 B2 JP H0789123B2 JP 62111768 A JP62111768 A JP 62111768A JP 11176887 A JP11176887 A JP 11176887A JP H0789123 B2 JPH0789123 B2 JP H0789123B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- acceleration
- comparator
- time
- safety 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 - Fee Related
Links
Landscapes
- Air Bags (AREA)
Description
【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、車輌の衝突時に乗員を保護するための安全装
置、例えばエアバッグやベルトリテンショナなどを作動
させるためのセンサシステムに関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for protecting an occupant in the event of a vehicle collision, for example, a sensor system for actuating an airbag, a belt tensioner or the like.
〈従来の技術〉 従来より、上述の安全装置が車輌の衝突時に確実に作動
し得るように、様々なセンサシステムが提案されてい
る。この種のセンサシステムは、車輌が衝突時に受ける
衝撃を加速度で検出し、その衝撃が一定以上になると安
全装置を作動させる方法が、一般的である。<Prior Art> Conventionally, various sensor systems have been proposed so that the above-described safety device can reliably operate in the event of a vehicle collision. In this type of sensor system, it is general to detect a shock received by a vehicle at the time of collision by acceleration, and to activate a safety device when the shock exceeds a certain level.
例えば米国特許公報第3,911,391号及び第4,164,263号両
明細書には一定値を超える加速度を時間で積分し、その
積分値に基づいて判断して安全装置の作動をオンオフす
る方法が開示されている。しかし、積分計算を行うため
に積分回路などの複雑な電子回路を必要とするので、シ
ステム全体が複雑となり、かつ製造コストが高騰するな
どの不都合がある。For example, U.S. Pat. Nos. 3,911,391 and 4,164,263 both disclose methods of integrating acceleration exceeding a certain value with time, and determining whether or not to operate the safety device based on the integrated value. However, since a complicated electronic circuit such as an integrating circuit is required to perform the integral calculation, there are disadvantages that the entire system becomes complicated and the manufacturing cost rises.
〈発明が解決しようとする問題点〉 そこで、本発明の目的は、比較的簡単な構成からなり、
作動の応答性が高く、かつ誤動作が少ない安全装置のた
めのセンサシステムを提供することにある。<Problems to be Solved by the Invention> Therefore, an object of the present invention is to have a relatively simple configuration,
It is an object of the present invention to provide a sensor system for a safety device that has high responsiveness of operation and has few malfunctions.
〈問題点を解決するための手段〉 上述の目的、本発明によれば、車輌の衝突時に安全装置
を作動させるためのセンサシステムであって、前記車輌
の加速度を検出する加速度センサと、前記加速度センサ
から出力される加速度信号を所定の閾値と比較して閾値
を超えた時はオン信号を、閾値を超えない時はオフ信号
を、それぞれ出力する比較器と、前記比較器から出力さ
れるオン信号の継続時間を計測する計時手段と、所定時
間内での前記継続時間の累積値が所定の値を超えると前
記安全装置を作動させる作動手段とを備えていることを
特徴とする安全装置のためのセンサシステムを提供する
ことにより達成される。<Means for Solving Problems> According to the above-mentioned object and the present invention, there is provided a sensor system for activating a safety device at the time of collision of a vehicle, the acceleration sensor detecting an acceleration of the vehicle, and the acceleration sensor. The acceleration signal output from the sensor is compared with a predetermined threshold value, an ON signal is output when the acceleration signal exceeds the threshold value, an OFF signal is output when the acceleration signal does not exceed the threshold value, and an ON signal output from the comparator. A safety device comprising: a time measuring unit that measures a duration of a signal; and an actuating unit that activates the safety device when a cumulative value of the duration within a predetermined time exceeds a predetermined value. This is achieved by providing a sensor system for.
〈作用〉 このようにすれば、車輌の衝突時には、弾性変形や塑性
変形が複雑に絡み合って車体変形が進行するために、衝
突時の加速度の変化パターンが短時間に上昇・下降を繰
り返す複雑なものとなるが、加速度が所定値を超えた状
態の継続時間のある時間内での累積値が所定値を超えた
ことを判断基準とすることにより、積分計算を行うため
の複雑な電子回路を必要とすることなく、比較的簡単な
構成で、衝突を正確に判別することができる。<Operation> In this way, at the time of a vehicle collision, elastic deformation and plastic deformation are intricately entangled with each other to progress the vehicle body deformation. However, by using the judgment criteria that the cumulative value within a certain period of time when the acceleration exceeds the predetermined value exceeds the predetermined value, a complicated electronic circuit for performing integral calculation can be implemented. A collision can be accurately discriminated with a relatively simple configuration without the need.
〈実施例〉 以下、本発明の好適実施例を添付の図面について詳しく
発明する。<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
加速度センサ１は、例えば歪みゲージ、圧電ゲージなど
を用いた周知のセンサ手段であって、車輌にかかる加速
度を電気信号に置き換えて出力する。加速度センサ１か
ら出力された加速度信号は、差動増幅機２によって適当
に増幅され、ローパスフィルタ３を通して、例えば50〜
100ヘルツ以上の高周波成分を除去した後に第１比較器
４へ送られる。The acceleration sensor 1 is a well-known sensor means using, for example, a strain gauge, a piezoelectric gauge, or the like, and outputs the acceleration applied to the vehicle by replacing it with an electric signal. The acceleration signal output from the acceleration sensor 1 is appropriately amplified by the differential amplifier 2 and passed through the low pass filter 3 to, for example, 50 to
After removing the high frequency component of 100 hertz or more, it is sent to the first comparator 4.
第１比較器４は、ローパスフィルタ３を通して入力され
る加速度信号Ｇを予め設定された閾値G0と比較する。閾
値G0は６〜10gの比較的高い値の範囲内で適当な値を決
定する。第１比較器４は、第２図に示されるような比較
結果に従い、第３図に示されるように加速度Ｇが閾値G0
を超えるとオン信号を、G0以下になるとオフ信号をタイ
マ５に出力する。タイマ５は、第１比較器４から出力さ
れるオン信号の持続時間を計測して第２比較器６へ出力
する。The first comparator 4 compares the acceleration signal G input through the low pass filter 3 with a preset threshold value G 0 . The threshold value G 0 determines an appropriate value within a relatively high value range of 6 to 10 g. According to the comparison result as shown in FIG. 2, the first comparator 4 sets the acceleration G to the threshold value G 0 as shown in FIG.
When it exceeds, the ON signal is output to the timer 5, and when it becomes G 0 or less, the OFF signal is output to the timer 5. The timer 5 measures the duration of the ON signal output from the first comparator 4 and outputs it to the second comparator 6.
第２比較器６は、第４図に示されるように、タイマ５か
ら出力されるオン信号の持続時間を累算し、その累積時
間Ｔ（単位:ms＝1/1000秒）を予め設定された閾値T0と
比較する。閾値T0は、例えば10msまたは15msとするのが
良い。第２比較器６は、累積時間Ｔが閾値T0を超えると
下流側のトリガ装置７にオン信号を出力する。トリガ装
置７は、比較器６からオン信号を入力すると、機械的ま
たは電気的手段を用いて図示されない安全装置を作動さ
せるようになっている。As shown in FIG. 4, the second comparator 6 accumulates the duration of the ON signal output from the timer 5 and presets the accumulated time T (unit: ms = 1/1000 seconds). Compared with the threshold T 0 . The threshold T 0 is preferably 10 ms or 15 ms, for example. The second comparator 6 outputs an ON signal to the trigger device 7 on the downstream side when the cumulative time T exceeds the threshold value T 0 . When the trigger device 7 receives an ON signal from the comparator 6, the trigger device 7 activates a safety device (not shown) using mechanical or electrical means.
上述の実施例では、第２比較器６は第１比較器４からの
出力がオン信号からオフ信号に変化すると、次にオン信
号に変化するまでの間、元の累積時間Ｔを維持するよう
になっているが、別の実施例では、加速度Ｇが閾値G0以
下に下がるが、その時間を一定の割合で、第４図に破線
で示されるように累積時間Ｔから減算するように設定す
ることもできる。これにより、車輌にかかる加速度がよ
り正確に把握されることになる。この減算率（Ｔの減少
分/tの増分）は、例えば0.5〜2ms/ms程度とするのが良
い。In the above-described embodiment, when the output from the first comparator 4 changes from the ON signal to the OFF signal, the second comparator 6 maintains the original accumulated time T until the next change to the ON signal. However, in another embodiment, the acceleration G falls below the threshold value G 0 , but the time is set to be subtracted from the cumulative time T at a constant rate as shown by the broken line in FIG. You can also do it. As a result, the acceleration applied to the vehicle can be grasped more accurately. This subtraction rate (reduction of T / increment of t) is preferably about 0.5 to 2 ms / ms, for example.
また、累積時間Ｔの累算は、長時間に亘って継続して行
われるものではなく、一定時間経過するとリセットされ
るようになっている。従って、先に受けた衝撃が後の衝
撃に影響を与えることはない。これは、例えば加速度Ｇ
が一定時間以上閾値G0以下である場合、即ち第１比較器
４からのオフ信号が一定時間以上継続した場合には第２
比較器６に於て累積時間Ｔが消去されるようにすれば良
い。Further, the accumulation of the cumulative time T is not continuously performed for a long time, but is reset after a certain time has elapsed. Therefore, the first impact does not affect the later impact. This is, for example, the acceleration G
Is above the threshold G 0 for a certain period of time or more, that is, when the OFF signal from the first comparator 4 continues for a certain period of time or more, the second
The accumulated time T may be erased in the comparator 6.
尚、本発明の技術的範囲は、上述の実施例に限定される
ものではなく、様々な変更・変形を加えて実施できるこ
とは当業者にとって明らかである。It will be apparent to those skilled in the art that the technical scope of the present invention is not limited to the above-described embodiments, and can be implemented with various changes and modifications.
〈発明の効果〉 上述のように、本発明によれば、一定値以上の加速度が
車輌に作用する時間を累積し、その累積時間に基づいて
衝突を判別することにより、複雑な電子回路を必要とす
ることなく比較的簡単な構成とすることができ、かつ作
動応答性が高められるという利点が得られる。また、閾
値G0を比較的高く設定できるので、誤動作を防止するこ
とができる。<Effects of the Invention> As described above, according to the present invention, a complicated electronic circuit is required by accumulating the time when the acceleration of a certain value or more acts on the vehicle and determining the collision based on the accumulated time. It is possible to obtain a merit that a relatively simple structure can be obtained without the need for the above, and the operation response can be improved. Moreover, since the threshold value G 0 can be set to be relatively high, it is possible to prevent malfunction.
第１図は、本発明による実施例を示すブロック図であ
る。 第２図乃至第４図は、それぞれ加速度信号、オンオフ信
号及び累積時間の経時変化を示す線図である。 １……加速度センサ、２……差動増幅機 ３……ローパスフィルタ、４……第１比較器 ５……タイマ、６……第２比較器 ７……トリガ装置FIG. 1 is a block diagram showing an embodiment according to the present invention. 2 to 4 are diagrams showing changes with time of the acceleration signal, the on / off signal, and the accumulated time, respectively. 1 ... Acceleration sensor, 2 ... Differential amplifier, 3 ... Low-pass filter, 4 ... First comparator, 5 ... Timer, 6 ... Second comparator, 7 ... Trigger device
Claims (1)
のセンサシステムであって、 車輌の加速度を検出する加速度センサと、 前記加速度センサから出力される加速度信号を所定の閾
値と比較して閾値を超えた時はオン信号を、閾値を超え
ない時はオフ信号を、それぞれ出力する比較器と、 前記比較器から出力されるオン信号の継続時間を計測す
る計時手段と、 所定時間内での前記継続時間の累積値が所定の値を超え
ると前記安全装置を作動させる作動手段とを備えている
ことを特徴とする安全装置のためのセンサシステム。1. A sensor system for actuating a safety device in the event of a collision of a vehicle, comprising: an acceleration sensor for detecting acceleration of the vehicle; and a threshold value obtained by comparing an acceleration signal output from the acceleration sensor with a predetermined threshold value. When it exceeds the ON signal, an ON signal when it does not exceed the threshold value, respectively, a comparator that outputs an OFF signal, and a clocking unit that measures the duration of the ON signal output from the comparator, within a predetermined time. A sensor system for a safety device, comprising: an actuation unit that activates the safety device when a cumulative value of the duration exceeds a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62111768A JPH0789123B2 (en) | 1987-05-08 | 1987-05-08 | Sensor system for safety devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62111768A JPH0789123B2 (en) | 1987-05-08 | 1987-05-08 | Sensor system for safety devices |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63275959A JPS63275959A (en) | 1988-11-14 |
| JPH0789123B2 true JPH0789123B2 (en) | 1995-09-27 |
Family
ID=14569683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62111768A Expired - Fee Related JPH0789123B2 (en) | 1987-05-08 | 1987-05-08 | Sensor system for safety devices |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0789123B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5787377A (en) * | 1990-08-24 | 1998-07-28 | Kanto Seiki Co. Ltd. | Air-bag control circuit |
| US6125313A (en) * | 1990-08-24 | 2000-09-26 | Kanto Seiki Co., Ltd. | Air-bag control circuit |
| JPH0637160B2 (en) * | 1990-09-27 | 1994-05-18 | 株式会社カンセイ | Vehicle occupant protection device |
| JP4864242B2 (en) | 2001-07-31 | 2012-02-01 | 三菱電機株式会社 | Vehicle collision determination device |
| JP4638527B2 (en) * | 2008-07-01 | 2011-02-23 | オートリブ株式会社 | Seat belt wearing detector |
| JP2011168276A (en) * | 2011-05-06 | 2011-09-01 | Mitsubishi Electric Corp | Collision determining apparatus for vehicle |
| US11034318B2 (en) * | 2019-06-04 | 2021-06-15 | B/E Aerospace, Inc. | Safety system initiator with electronically adjustable fire time |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61132821A (en) * | 1984-12-03 | 1986-06-20 | Arupain Kk | Motion sensor |
| JPS6141030B2 (en) * | 1978-09-28 | 1986-09-12 | Sumitomo Electric Industries |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6141030U (en) * | 1984-08-21 | 1986-03-15 | 三菱自動車工業株式会社 | four wheel drive vehicle |
-
1987
- 1987-05-08 JP JP62111768A patent/JPH0789123B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6141030B2 (en) * | 1978-09-28 | 1986-09-12 | Sumitomo Electric Industries | |
| JPS61132821A (en) * | 1984-12-03 | 1986-06-20 | Arupain Kk | Motion sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63275959A (en) | 1988-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5610575A (en) | Method and system for detecting vehicle roll-over | |
| JP2543839B2 (en) | Collision sensor | |
| US5037129A (en) | Safety device for vehicle occupants | |
| US5068793A (en) | Apparatus for triggering passenger protection systems | |
| US5546307A (en) | Method and apparatus for discriminating vehicle crash conditions | |
| KR0180775B1 (en) | Method and apparatus for controlling an airbag restraint system | |
| EP0511556B1 (en) | Crash sensor | |
| JP2879977B2 (en) | Collision sensor | |
| EP0344788A3 (en) | Apparatus for recording the operating condition of a vehicle safty device | |
| US5309138A (en) | Vehicle collision detecting method employing an acceleration sensor | |
| JPH03208749A (en) | Activation device for passenger restricting device which activates car passenger restricting device in response to vehicle jerk and device activation method | |
| JPH05178163A (en) | Changable air bag ignition circuit | |
| JPH06298037A (en) | Occupant restraint device, method of operating said device and crash sensor | |
| JPH07251701A (en) | Method and device for controlling actuatable protective device | |
| JPH10507832A (en) | Envelope detector useful for collision detection | |
| JPH0789123B2 (en) | Sensor system for safety devices | |
| JPH0711533B2 (en) | Vehicle collision detection device | |
| JP3388793B2 (en) | Trip device for car safety equipment | |
| EP0782514B1 (en) | Method for damping crash-discrimination measures | |
| US5101115A (en) | Evaluation process and evaluation device for sensor output signals | |
| JP3119001B2 (en) | Acceleration measuring method and acceleration measuring device | |
| JPH0560777A (en) | Collision detecting method | |
| JP3965513B2 (en) | Collision determination device for airbag system | |
| JPH049141A (en) | Doze preventer for vehicle | |
| JPH0637160B2 (en) | Vehicle occupant protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |