JPH01269641A - Trouble diagnosing and recording device for air bag device - Google Patents
Trouble diagnosing and recording device for air bag deviceInfo
- Publication number
- JPH01269641A JPH01269641A JP63097861A JP9786188A JPH01269641A JP H01269641 A JPH01269641 A JP H01269641A JP 63097861 A JP63097861 A JP 63097861A JP 9786188 A JP9786188 A JP 9786188A JP H01269641 A JPH01269641 A JP H01269641A
- Authority
- JP
- Japan
- Prior art keywords
- nvram
- data
- squib
- failure
- air bag
- 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
- 238000003745 diagnosis Methods 0.000 claims abstract description 16
- 230000015654 memory Effects 0.000 claims abstract description 12
- 239000004065 semiconductor Substances 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 description 10
- 230000004913 activation Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000011550 data transformation method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Debugging And Monitoring (AREA)
- Test And Diagnosis Of Digital Computers (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、エアバッグ装置の故障診断データを半導体
不揮発性メモリに多重記録して比較し、半導体不運発性
メモリ自体の故障を検出できるようにして信頼性を向上
できるようにした車両用のエアバッグ装置の故障診断記
録装置に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention is capable of detecting a failure of the semiconductor nonvolatile memory itself by multiplexing and comparing failure diagnosis data of an airbag device in a semiconductor nonvolatile memory. The present invention relates to a failure diagnosis recording device for a vehicle airbag device, which is capable of improving reliability.
第6図は例えば実開昭62−32926号公報に示され
た従来のエアバッグ装置の記録装置を示すブロック図で
あり、図において1bは車両の衝突加速度に応答する加
速度センサ(以下、Gセンサとい’l)、lcはGセン
サlbにより起動されるスクイブであり、このGセンサ
1aとスクイブ1cとによりエアバッグ装置1が構成さ
れている。FIG. 6 is a block diagram showing a recording device of a conventional airbag device disclosed in, for example, Japanese Utility Model Application Publication No. 62-32926. 1), lc is a squib activated by the G sensor 1b, and the airbag device 1 is constituted by the G sensor 1a and the squib 1c.
21はエアバッグ装?lflが異常状態にあることを判
定する判定手段、3は判定手段21の判定に応動して前
記異常状態を警報する警報器、22はスクイブICの起
動を検出する起動検出手段、23は起動検出手段22の
起動検出に応動して前記警報があったことを記録する記
録手段である。Is 21 equipped with an airbag? Determination means for determining that the lfl is in an abnormal state; 3 an alarm for warning of the abnormal state in response to the determination by the determination means 21; 22, activation detection means for detecting activation of the squib IC; and 23, activation detection. This is a recording means for recording that the alarm has been issued in response to detection of activation of the means 22.
ところで、エアバッグ装置において、従来がら議論され
ていることの一つは、車両衝突時にエアバッグ不展開な
どの不作動が発生した場合の原因究明方法の必要性であ
る。By the way, one of the issues that has been discussed in the past regarding airbag devices is the necessity of a method for investigating the cause when a non-operation such as non-deployment of an airbag occurs during a vehicle collision.
第6図の従来例では、エアバッグ装置lの展開前、ある
いは不展開前の警報の有無を記録し、前記原因究明に役
立てることを目的としている。In the conventional example shown in FIG. 6, the presence or absence of a warning before the airbag device 1 is deployed or not deployed is recorded, and the purpose is to use this information to investigate the cause.
この第6図において、判定手段21は常時エアバッグ装
置1の故障を判定し、故障があった場合に警報器3に警
報を出す一方、起動検出手段22がスクイブlcの起動
すなわち通電点火を検出すると同時に、前記警報の有無
を記録手段23に記録する。In FIG. 6, the determining means 21 constantly determines the failure of the airbag device 1 and issues an alarm to the alarm 3 when there is a failure, while the activation detecting means 22 detects the activation of the squib LC, that is, the ignition of current. At the same time, the presence or absence of the warning is recorded in the recording means 23.
従来のエアバッグ装置の記録装置は以上のように構成さ
れているので、前記記録手段23自体の故障に対して検
出する手段および対策がなく、エアバッグ装置の記録装
置としての重要性に対する信転性が確保されないという
問題点があった。Since the recording device of the conventional airbag device is configured as described above, there is no means or countermeasure for detecting a failure of the recording means 23 itself, and there is no confidence in the importance of the recording device of the airbag device as a recording device. There was a problem that gender was not guaranteed.
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、エアバッグ装置の故障診断データを記録する
記録装置自体の故障を診断し運転者に知らせることので
きるエアバッグ装置の故障診断記録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 it provides a failure diagnosis for an airbag device that can diagnose a failure of the recording device itself that records failure diagnosis data of the airbag device and notify the driver. The purpose is to obtain a recording device.
この発明に係るエアバッグ装置の故障診断記録装置は、
エアバッグ装置の複数個所を診断して故障を判定し、か
つ診断データを出方する処理部と、この処理部から出力
される複数個所の診断データを多重記憶しその多重記憶
内容を処理部に出力する半導体不揮発性メモリ (以下
、NVRAMという)とを設けたものである。A failure diagnosis recording device for an airbag device according to the present invention includes:
A processing unit that diagnoses multiple locations of the airbag device to determine failure and outputs diagnostic data; and a processing unit that multiplexes the diagnostic data output from the processing unit and stores the multiplexed storage contents in the processing unit. It is equipped with a semiconductor non-volatile memory (hereinafter referred to as NVRAM) for output.
この発明においては、処理部はエアバッグ装置の複数個
所の診断を行ってエアバッグ装置の故障診断データを何
個所にもNVRAMに多重記録し、このNVRAMで多
重記録された診断データを処理部で比較してNVRAM
のビットiり故障を検出する。In this invention, the processing section diagnoses multiple locations of the airbag device, multiplexes the failure diagnosis data of the airbag device at multiple locations in the NVRAM, and stores the diagnostic data multiplexed in the NVRAM in the processing section. NVRAM in comparison
Detects a bit failure.
以下、この発明の一実施例を図に基づき説明する。第1
図はその全体の構成を示すブロック図であり、図におい
て、Ibl、Ib2はGセンサ、lcはスクイブ、1a
はスクイブ1cが点火するのに十分な電流を流せる電源
である。Hereinafter, one embodiment of the present invention will be described based on the drawings. 1st
The figure is a block diagram showing the overall configuration. In the figure, Ibl and Ib2 are G sensors, lc is a squib, and 1a
is a power source that can flow enough current to ignite the squib 1c.
1はこれらの電源1a、Gセンサlbl 、 1b2
。1 is these power supply 1a, G sensor lbl, 1b2
.
スクイブlcより構成されるエアバッグ装zである。This is an airbag system consisting of a squib LC.
2aはエアバッグ装置1の故障を検出する故障検出部、
2bはスクイブ1cに点火電流が流れたことを検出する
スクイブ通電検出部、2cは故障検出部2a、スクイブ
通電検出部2bの出力を受けて処理をするマイクロコン
ピュータ(以下マイコンと略す)、2は故障検出部2a
、スクイブ通電検出部2b、マイコン2cで構成される
処理部である。2a is a failure detection unit that detects a failure of the airbag device 1;
2b is a squib energization detection unit that detects that ignition current has flowed to the squib 1c; 2c is a microcomputer (hereinafter abbreviated as microcomputer) that receives and processes the outputs of the failure detection unit 2a and the squib energization detection unit 2b; Failure detection section 2a
, a squib energization detection section 2b, and a microcomputer 2c.
3はマイコン2cによって制御される警報器、4はマイ
コン2cから書き込み、読み出しされるNVRAMであ
る。3 is an alarm device controlled by the microcomputer 2c, and 4 is an NVRAM to which data is written and read from the microcomputer 2c.
次に動作について説明する。マイコン2cは常時故障検
出部2aの出力を見て故障と判定すれば、警報器3に警
報を出すと同時にNVRAM4に故障診断データを書き
込む。Next, the operation will be explained. If the microcomputer 2c constantly checks the output of the failure detection section 2a and determines that there is a failure, it issues an alarm to the alarm device 3 and writes failure diagnosis data to the NVRAM 4 at the same time.
さらに、スクイブ通電検出部2bが点火電流通電を検出
した時点でマイコン2cはNVRAM4にスクイブ通電
のデータを書き込んだ後、NVRAM4への書き込みを
禁止する。Further, when the squib energization detection section 2b detects ignition current energization, the microcomputer 2c writes the squib energization data to the NVRAM4, and then prohibits writing to the NVRAM4.
このようにすることにより、スクイブ通電、すなわち車
両の衝突以前のエアバッグ装置の状態を、エアバッグの
展開、不展開にかかわらず記録する。By doing so, the squib energization, that is, the state of the airbag device before the vehicle collision is recorded regardless of whether the airbag is deployed or not.
次に具体的にNVRAM4への書き込み方法などについ
て説明する。第2図は、マイコン2cとNVRAM4の
データのやりとりを示す概念図であり、5は例えばフラ
グ■〜■がエアバッグ装置lの各種故障の有無に対応し
た8ビツトのマイコンメモリ、6はブロックA、B、C
の二つの部分からなるNVRAMの一部、6a、6b、
6cはマイコンメモリ5の内容をブロックA、B、Cに
書き込んだNVRAM6の一部である。Next, a method of writing to the NVRAM 4 will be specifically explained. FIG. 2 is a conceptual diagram showing the exchange of data between the microcomputer 2c and the NVRAM 4. For example, 5 is an 8-bit microcomputer memory whose flags ■ to ■ correspond to the presence or absence of various failures in the airbag device l, and 6 is a block A. ,B,C
A part of NVRAM consisting of two parts, 6a, 6b,
6c is a part of the NVRAM 6 in which the contents of the microcomputer memory 5 are written into blocks A, B, and C.
第2図におけるNVRAM6への書き込み、゛読み出し
を第3図〜第5図のフローチャートで説明する。第3図
は書き込みサブルーチンで、大刀引数は書き込みデータ
とブロック種別であり、まずステップS1でA、B、C
のどのブロックに書き込むかにより分岐し、ステップ8
2〜s4においてローテートビット数RにブロックAの
場合はo1ブロックBの場合は1、ブロックCの場合は
2を代入し、ステップS5で書き込みデータをRビット
だけ右にローテートし、ステップS6でNVRAM6へ
の書き込み動作WRITEを行う。Writing to and reading from the NVRAM 6 in FIG. 2 will be explained with reference to flowcharts in FIGS. 3 to 5. Figure 3 shows the write subroutine, where the main arguments are write data and block type.First, in step S1, A, B, C
Branches depending on which block to write to, and goes to step 8.
In steps 2 to s4, assign o1 for block A, 1 for block B, and 2 for block C to the rotation bit number R in steps 2 to s4.In step S5, the write data is rotated to the right by R bits.In step S6, the write data is rotated to the right by R bits. Performs a write operation WRITE to.
第4図は読み出しサブルーチンで、入力引数はブロック
種別、出力引数は読み出しデータとなり、ステップSl
l〜S14は前記第3図のステップ5t−34と同様で
、ステップ315で読み出し動作READを行い、ステ
ップ316で読み出しデータをRビットだけ左にローテ
ートする。Figure 4 shows the read subroutine, where the input argument is the block type, the output argument is the read data, and step Sl
Steps 1 to S14 are similar to step 5t-34 in FIG. 3, in which a read operation READ is performed in step 315, and the read data is rotated to the left by R bits in step 316.
このようにすることにより、第2図のNVRAM 6
において、ブロックB、CのデータはブロックAのデー
タを各々1ビツトおよび2ビツト右にローテートしたも
のになっている。By doing this, the NVRAM 6 in FIG.
In this case, the data in blocks B and C are obtained by rotating the data in block A to the right by 1 bit and 2 bits, respectively.
NVRAMの故障検出方法としては2通りあり、第5図
(alのステップ317で一つのデータを書き込んだ際
、すぐにステップ318でそのデータを読み出し、ステ
ップS19で書き込みデータと比較し、不一致の場合、
ステップS20でエラーフラグを立てて故障検出する方
法と、第5図(blのステップ321でブロックA、B
、Cの同種類データを読み出し、ステップS22でこれ
らのデータを相互比較し、不一致の場合ステップS23
でエラーフラグを立てて故障検出する方法とがある。There are two ways to detect failures in NVRAM, as shown in Figure 5 (al), when one piece of data is written in step 317, that data is immediately read out in step 318, and compared with the written data in step S19. ,
A method for detecting a failure by setting an error flag in step S20, and a method for detecting a failure by setting an error flag in step S20, and
, C, and compare these data with each other in step S22. If they do not match, the process proceeds to step S23.
There is a method of detecting a failure by setting an error flag.
以上のように、この実施例によれば、NVRAMに診断
データを書き込む際に第5図(alで示した方法でNV
RAMの故障を検出し、NVRAMへの書き込みが長時
間ない場合でも、第5図山)に示した方法でNVRAM
の故障検出ができる。As described above, according to this embodiment, when writing diagnostic data to NVRAM, the NVRAM is
Even if a RAM failure is detected and there has been no writing to NVRAM for a long time, use the method shown in Figure 5 to update NVRAM.
can detect failures.
また、一般に半導体メモリはビットライン、ワードライ
ンでマトリクス状に構成されているが、第2図のごと(
NVRAMの記録データを構成することにより、ビット
ラインに関してはブロック毎にローテートしてピントを
ずらせていること、ワードラインに関しては同じデータ
を3ブロツクに書いていることで、第5図(blの方法
によりNVRAMのビットライン、ワードライン両方の
故障検出をできる効果がある。Additionally, semiconductor memories are generally configured in a matrix with bit lines and word lines, as shown in Figure 2 (
By configuring the recorded data of the NVRAM, the bit line is rotated and the focus is shifted for each block, and the word line is written with the same data in three blocks. This has the effect of being able to detect failures in both the bit line and word line of the NVRAM.
また、以上の方法によれば、パリティビットなどの特別
なビットを設けることもなく、簡単な方法でメモリのビ
ット誤りを検出できるという効果もある。Furthermore, the above method has the advantage that bit errors in memory can be detected in a simple manner without providing special bits such as parity bits.
さらに、以上のようにNVRAMの故障を検出すると、
第1図においてマイコン2Cは警報器3に警報を出すこ
とにより故障診断記録装置の異常として運転者に知らせ
ることができる。Furthermore, when an NVRAM failure is detected as described above,
In FIG. 1, the microcomputer 2C can notify the driver of an abnormality in the failure diagnosis recording device by issuing an alarm to the alarm device 3.
一方、NVRAM4の故障が発生した場合でも、前記の
ように同一データを何か所にも記録しておけば、多数決
をとることにより、故障診断状態を推定できるという効
果もある。On the other hand, even if a failure occurs in the NVRAM 4, if the same data is recorded in several places as described above, there is an effect that the failure diagnosis state can be estimated by taking a majority vote.
なお、以上の実施例では、NVRAMの3ブロツクに同
一データを変形して記録したが、ブロック数はこれより
多くても問題なく、むしろ多数決の効果は大きくなる。In the above embodiment, the same data was recorded in three blocks of the NVRAM in a modified form, but there is no problem even if the number of blocks is larger than this, and the effect of majority voting becomes greater.
また、データの変形方法として前記のθ〜2ビットロー
テートする方法において、ローテートのビット数は適当
に換えても前記と同様の効果が得られる。Furthermore, in the method of rotating data by 2 bits as described above as a data transformation method, the same effect as described above can be obtained even if the number of rotated bits is changed appropriately.
さらに、前記実施例ではNVRAMに記録する診断デー
タとして8ビツトのフラグを例にあげたが、データのビ
ット数は8ビツト以外でもよく、フラグ以外に数値デー
タも故障診断記録データとすることはあり得る。Furthermore, in the above embodiment, an 8-bit flag was used as an example of the diagnostic data recorded in the NVRAM, but the number of bits of data may be other than 8 bits, and numerical data other than flags may also be used as failure diagnosis record data. obtain.
以上のように、この発明によれば、エアバッグ装置の故
障診断データをNVRAMに多重記録して処理部で比較
し、NVRAM自体の故障を検出するように構成したの
で、エアバッグ装置の故障診断記録装置にNVRAMを
用いた場合、このNVRAM自体の故障を常時監視でき
、信顛性の高い診断データを記録できるという効果があ
る。As described above, according to the present invention, the failure diagnosis data of the airbag device is multiple recorded in the NVRAM and compared in the processing section to detect a failure of the NVRAM itself. When an NVRAM is used as a recording device, the NVRAM itself can be constantly monitored for failures, and highly reliable diagnostic data can be recorded.
第1図はこの発明の一実施例によるエアバッグ装置の故
障診断記録装置の全体構成図、第2図は同上実施例にお
けるマイコンとNVRAMのデータの授受を示す概念図
、第3図は同上実施例におけるNVRAMの書き込みサ
ブルーチンのフローチャート、第4図は同上実施例にお
けるNVRAM4の読み出しサブルーチンのフローチャ
ート、第5図(a)、第5図(1))はそれぞれ同上実
施例におけるNVRAMの故障検出方法を示すフローチ
ャート、第6図は従来のエアバッグ装置の記録装置を示
す全体構成図である。
l・・・エアバッグ装置、2・・・処理部、3・・・警
報器、4・・・半導体不揮発性メモリ。
なお、図中、同一符号は同一、または相当部分を示す。
代理人 大 岩 増 雄
第2図
VRAM
第5図
(0) (b)第6図
!Fig. 1 is an overall configuration diagram of a failure diagnosis recording device for an airbag device according to an embodiment of the present invention, Fig. 2 is a conceptual diagram showing data exchange between a microcomputer and NVRAM in the embodiment of the above, and Fig. 3 is an implementation of the same. FIG. 4 is a flowchart of the NVRAM 4 read subroutine in the above embodiment, and FIGS. 5(a) and 5(1)) respectively show the NVRAM failure detection method in the above embodiment. The flowchart shown in FIG. 6 is an overall configuration diagram showing a conventional recording device for an airbag device. 1...Airbag device, 2...Processing unit, 3...Alarm device, 4...Semiconductor nonvolatile memory. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa Figure 2 VRAM Figure 5 (0) (b) Figure 6!
Claims (1)
理部と、この処理部から出力される診断データを多重記
録するとともにこの多重記録した診断データを上記処理
部で比較されてビット誤り故障が検出される半導体不揮
発性メモリと、上記処理部で制御され上記エアバッグ装
置および上記半導体不揮発性メモリの故障時に警報する
警報器とを備えたエアバッグ装置の故障診断記録装置。A processing unit that diagnoses multiple locations of the airbag device to determine failure, multiple recording of diagnostic data output from this processing unit, and comparing the multiple recorded diagnostic data in the processing unit to detect a bit error failure. A failure diagnosis recording device for an airbag device, comprising: a semiconductor nonvolatile memory; and an alarm that is controlled by the processing section and issues an alarm when the airbag device and the semiconductor nonvolatile memory fail.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63097861A JPH01269641A (en) | 1988-04-19 | 1988-04-19 | Trouble diagnosing and recording device for air bag device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63097861A JPH01269641A (en) | 1988-04-19 | 1988-04-19 | Trouble diagnosing and recording device for air bag device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01269641A true JPH01269641A (en) | 1989-10-27 |
Family
ID=14203534
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63097861A Pending JPH01269641A (en) | 1988-04-19 | 1988-04-19 | Trouble diagnosing and recording device for air bag device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01269641A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4209140A1 (en) * | 1991-03-20 | 1992-09-24 | Hitachi Ltd | Impact determination unit for gas cushion systems with detector unit - which detects acceleration caused by motor vehicle and transmits electric signals corresp. to this acceleration and discrimination unit |
US5897599A (en) * | 1991-05-29 | 1999-04-27 | Airbag Systems Company, Ltd. | Control system for a vehicle safety device with EEPROM memory for storing gain |
-
1988
- 1988-04-19 JP JP63097861A patent/JPH01269641A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4209140A1 (en) * | 1991-03-20 | 1992-09-24 | Hitachi Ltd | Impact determination unit for gas cushion systems with detector unit - which detects acceleration caused by motor vehicle and transmits electric signals corresp. to this acceleration and discrimination unit |
US5387819A (en) * | 1991-03-20 | 1995-02-07 | Hitachi, Ltd. | Crash detection apparatus of air bag system |
DE4209140C2 (en) * | 1991-03-20 | 1996-06-20 | Hitachi Ltd | Impact detection device for gas cushion systems |
US5897599A (en) * | 1991-05-29 | 1999-04-27 | Airbag Systems Company, Ltd. | Control system for a vehicle safety device with EEPROM memory for storing gain |
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