JPH03192401A - Cpu backup device for automobile controller - Google Patents
Cpu backup device for automobile controllerInfo
- Publication number
- JPH03192401A JPH03192401A JP1319024A JP31902489A JPH03192401A JP H03192401 A JPH03192401 A JP H03192401A JP 1319024 A JP1319024 A JP 1319024A JP 31902489 A JP31902489 A JP 31902489A JP H03192401 A JPH03192401 A JP H03192401A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- cpu
- power supply
- switching
- supply voltage
- 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.)
- Granted
Links
- 230000005856 abnormality Effects 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims description 11
- 230000000593 degrading effect Effects 0.000 abstract 1
- 230000007257 malfunction Effects 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 239000013256 coordination polymer Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Safety Devices In Control Systems (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、自動車用制御装置のＣＰＵバックアップ装置
に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a CPU backup device for an automobile control device.
〈従来の技術〉
近年では、自動車用エンジン等をマイクロコンピュータ
によって制御して、燃費、出力、排気特性及び運転性を
確保する必要最小限の制御を実行できるようにしたフェ
ールセーフを採用する必要がある。<Conventional technology> In recent years, it has become necessary to adopt fail-safe systems that control automobile engines using microcomputers to perform the minimum necessary control to ensure fuel efficiency, output, exhaust characteristics, and drivability. be.
このため、従来では、第２図に示すように、ＣＰＵＩと
、該ＣＰＵＩのバックアップ用制御回路（リンツブホー
ム）２と、１亥ＣＰＵＩとバックアップ用制御回路２と
を切り換える切換回路３と、ＣＰＵＩを監視して該ＣＰ
Ｕ１に異常が発生した時にリセット信号を供給する図示
しない監視回路と、ＣＰＵＩから供給されるリセット信
号をカウントし、これが所定数より多くなった時にＣＰ
ＵＩからバックアップ用制御回路２に切り換える切換信
号を前記切換回路３に出力する切換手段としての異常判
定回路４及びラッチ回路５を備えるようにしている。For this reason, conventionally, as shown in FIG. to monitor the corresponding CP
A monitoring circuit (not shown) that supplies a reset signal when an abnormality occurs in U1 and a reset signal supplied from the CPUI count the number of reset signals supplied from the CPU, and when the number exceeds a predetermined number, the CPU
An abnormality determination circuit 4 and a latch circuit 5 are provided as switching means for outputting a switching signal for switching from the UI to the backup control circuit 2 to the switching circuit 3.
即ち、所定時間内に発生したリセット信号の回数が所定
数以上となると、ＣＰＵＩの異常と見做してバックアッ
プ用制御回路２に切り換える切換信号が発生する。この
切換信号は一旦発生すると電源ＯＮ中は持続するように
なっている。つまり、−旦、バックアップ用制御回路２
に切り換えられると、電源ＯＮ中は切り換えられたまま
となる。That is, when the number of reset signals generated within a predetermined time exceeds a predetermined number, it is assumed that the CPU is abnormal and a switching signal is generated to switch to the backup control circuit 2. Once this switching signal is generated, it is maintained while the power is turned on. In other words, -d, backup control circuit 2
Once switched to , it remains switched while the power is turned on.
そして、バックアップ用制御回路２に切り換えられた後
は、該バックアップ用制御回路２に入力されるアイドル
スイッチやエンジン回転信号（ＲＥＦ、ＰＯ３）等に基
づいて、燃料噴射装置、点火時期制御装置及び燃料供給
装置等を簡易的に制御する。After switching to the backup control circuit 2, the fuel injection device, ignition timing control device and fuel Easily control supply devices, etc.
〈発明が解決しようとする課題〉
しかしながら、このような従来の構成では、バッテリの
劣化時の始動時等で電源電圧Ｖｃｃが低下した場合、Ｃ
ＰＵＩが一時的に異常を来した場合の対策は施されてい
ない。<Problems to be Solved by the Invention> However, in such a conventional configuration, when the power supply voltage Vcc decreases at the time of starting when the battery is deteriorated, the C
No countermeasures have been taken in the event that the PUI temporarily malfunctions.
このため、バッテリの劣化時の始動時等で電源量・圧Ｖ
ｃｃが低下して、−時的にＣＰＵＩが異常を来した際に
、バックアップ用制御回路２への切り換えを可能として
始動を可能とする構成を採用することが考えられるが、
これでは、その後、電源電圧Ｖｃｃが正常復帰しても、
バックアップ用制御回路２に切り換わったままとなって
しまい、その後の制御に支障を来す。For this reason, when starting up when the battery is deteriorated, the amount of power and voltage V
It is conceivable to adopt a configuration that enables switching to the backup control circuit 2 and starting when the cc decreases and the CPUI malfunctions from time to time.
In this case, even if the power supply voltage Vcc returns to normal after that,
The control circuit remains switched to the backup control circuit 2, causing trouble in subsequent control.
そこで、本発明は以上のような従来の問題点に鑑み、バ
ッテリの劣化時の始動時等で電源電圧が低下して、−時
的にＣＰＵが異常を来した際に、バックアップ用制御回
路への切り換えを可能とし、しかも、電源電圧が正常復
帰した場合には、ＣＰＵに切換復帰させる構成にして、
始動性の向上並びにその後の制御性の向上を図ることを
目的とする。Therefore, in view of the above-mentioned conventional problems, the present invention has been devised so that when the power supply voltage drops during startup when the battery deteriorates and the CPU occasionally malfunctions, the backup control circuit is In addition, when the power supply voltage returns to normal, the CPU is configured to switch back to normal.
The purpose is to improve startability and subsequent controllability.
〈課題を解決するための手段〉
このため、本発明の自動車用制御装置のＣＰＵバックア
ップ装置は、ＣＰ Ｕと、該ＣＰＵのバックアップ用制
御回路と、該ｃｐｕとバックアップ用制御回路とを切り
換える切換回路と、ＣＰＵを監視して該ＣＰＵに異常が
発生した時にリセット信号を供給する監視回路と、該Ｃ
ＰＵに供給されるリセット信号が所定数より多くなった
時にＣＰＵからバックアップ用制御回路に切り換える切
換信号を前記切換回路に出力する切換手段と、を備えて
なる自動車用制御装置のＣＰＵバックアップ装置におい
て、ＣＰＵへの電源電圧と基準電圧とを比較し、電源電
圧が基準電圧よりも低下した時にラッチ回路をラッチす
る信号を出力し、かつ電源電圧が基準電圧よりも上昇し
た時にラッチ回路をラッチ解除する信号を出力する電源
電圧監視回路を設け、前記ラッチ回路からの信号と前記
切換手段からの切換信号とをＯＲ回路を介して前記切換
回路に入力させるようにした。<Means for Solving the Problems> For this reason, the CPU backup device of the automotive control device of the present invention includes a CPU, a backup control circuit for the CPU, and a switching circuit for switching between the CPU and the backup control circuit. a monitoring circuit that monitors the CPU and supplies a reset signal when an abnormality occurs in the CPU;
A CPU backup device for an automobile control device, comprising: switching means for outputting a switching signal for switching from the CPU to the backup control circuit to the switching circuit when the number of reset signals supplied to the PU exceeds a predetermined number; Compares the power supply voltage to the CPU with the reference voltage, outputs a signal to latch the latch circuit when the power supply voltage falls below the reference voltage, and unlatches the latch circuit when the power supply voltage rises above the reference voltage. A power supply voltage monitoring circuit for outputting a signal is provided, and the signal from the latch circuit and the switching signal from the switching means are input to the switching circuit via an OR circuit.
く作用〉
かかる構成において、バッテリの劣化時の始動時等で電
源電圧が低下した場合にバックアップ用制御回路に切り
換わり、その後電源電圧が正常復帰後にバックアップ用
制御回路に切り換えられた状態が解除される。In this configuration, when the power supply voltage drops during startup when the battery deteriorates, the control circuit is switched to the backup control circuit, and after the power supply voltage returns to normal, the state of switching to the backup control circuit is released. Ru.
従って、バッテリの劣化時の始動時等で電源電圧が低下
して、−時的にＣＰＵが異常を来した際に、バックアッ
プ用制御回路への切り換えが可能となり、しかも、電源
電圧が正常復帰した場合には、ＣＰＵに切換復帰可能と
なるので、始動性の向上並びにその後の制御性に支障を
来すことがない。Therefore, when the power supply voltage drops during startup when the battery deteriorates, and the CPU occasionally malfunctions, it is possible to switch to the backup control circuit, and the power supply voltage returns to normal. In this case, it is possible to switch back to the CPU, so there is no problem with improving startability and subsequent controllability.
〈実施例〉 以下、本発明の実施例を図面に基づいて説明する。<Example> Embodiments of the present invention will be described below based on the drawings.
尚、第１図において、第２図と同一要素のものには同一
符号を付して説明を簡単にする。In FIG. 1, the same elements as those in FIG. 2 are given the same reference numerals to simplify the explanation.
図において、ＣＰＵ１と、バックアップ用制御回路（リ
ンプホーム）２と、切換回路３と、監視回路（図示せず
）と、異常判定回路４と、う・ソチ回路５を備えた構成
は従来と同様である。In the figure, the configuration including a CPU 1, a backup control circuit (limp home) 2, a switching circuit 3, a monitoring circuit (not shown), an abnormality determination circuit 4, and a false/sochi circuit 5 is the same as the conventional one. It is.
そして、従来の構成との相違点は次のようである。The differences from the conventional configuration are as follows.
即ち、ＣＰＵＩへの電源電圧Ｖｃｃと基準電圧とを比較
し、電源電圧Ｖｃｃが基準電圧（所定スライスレベル）
よりも低下した時にラッチ回路７をラッチする信号を出
力し、かつ電源電圧Ｖｃｃが基準電圧よりも上昇した時
にラッチ回路７をラッチ解除する信号を出力する電源電
圧監視回路６が設けられている。そして、前記ラッチ回
路７からの信号と前記異常判定回路４とラッチ回路５か
らなる切換手段からの切換信号とがＯＲ回路８を介して
前記切換回路３に人力されるように構成される。That is, the power supply voltage Vcc to the CPUI is compared with the reference voltage, and the power supply voltage Vcc is the reference voltage (predetermined slice level).
A power supply voltage monitoring circuit 6 is provided which outputs a signal to latch the latch circuit 7 when the power supply voltage Vcc becomes lower than the reference voltage, and outputs a signal to unlatch the latch circuit 7 when the power supply voltage Vcc rises above the reference voltage. The signal from the latch circuit 7 and the switching signal from the switching means made up of the abnormality determination circuit 4 and the latch circuit 5 are manually input to the switching circuit 3 via the OR circuit 8.
次に、かかる構成の作用について説明する。Next, the operation of this configuration will be explained.
所定時間内に発生したリセット信号の回数（例えば２回
／ １ ｓ ｅ ｃ ）が所定数以上となると、異常判
定回路４がＣＰＵＩの異常と見做してバックアップ用制
御口回路２に切り換える切換信号をラッチ回路５に出力
し、該切換信号は該ラッチ回路５からＯＲ回路８を介し
て切換回路３に出力される。When the number of reset signals generated within a predetermined time (for example, 2 times/1 sec) exceeds a predetermined number, the abnormality determination circuit 4 considers that the CPU is abnormal and switches to the backup control port circuit 2. is output to the latch circuit 5, and the switching signal is output from the latch circuit 5 to the switching circuit 3 via the OR circuit 8.
従って、バックアップ用制御回路２に切り換えられ、そ
の後は、該バックアップ用制御回路２に入力されるアイ
ドルスイッチやエンジン回転信号（ＲＥＦ、ＰＯ３）等
に基づいて、燃料噴射装置、点火時期制御装置及び燃料
供給装置等を簡易的に制御する。Therefore, the control circuit 2 is switched to the backup control circuit 2, and thereafter, the fuel injection device, ignition timing control device and fuel Easily control supply devices, etc.
以上の作用は従来と略同様である。The above operation is substantially the same as the conventional one.
そして、バッテリの劣化時の始動時等で電源電圧Ｖｃｃ
が低下して、−時的にＣＰＵＩが異常を来した際には、
次のように制御される。Then, at the time of starting when the battery is deteriorated, the power supply voltage Vcc
When the CPUI becomes abnormal and the CPUI becomes abnormal from time to time,
It is controlled as follows.
即ち、電源電圧監視回路６によってＣＰＵへの電源電圧
Ｖｃｃと基準電圧とが比較され、電源電・圧Ｖｃｃが基
準電圧よりも低下するので、ラッチ回路７をラッチする
信号が出力される。That is, the power supply voltage monitoring circuit 6 compares the power supply voltage Vcc to the CPU with the reference voltage, and since the power supply voltage/voltage Vcc becomes lower than the reference voltage, a signal for latching the latch circuit 7 is output.
従って、ラッチ回路７からの切換信号がＯＲ回路８を介
して前記切換回路３に出力され、バックアップ用制御回
路２に切り換えられる。Therefore, the switching signal from the latch circuit 7 is outputted to the switching circuit 3 via the OR circuit 8, and is switched to the backup control circuit 2.
次に、電源電圧Ｖｃｃが正常宜帰すると、電源電圧監視
回路６によってＣＰＵＩへの電源電圧Ｖｃｃと基準電圧
とが比較され、電源電圧Ｖｃｃが基準電圧よりも上昇す
るので、ラッチ回路６がラッチ解除される。Next, when the power supply voltage Vcc returns to normal, the power supply voltage monitoring circuit 6 compares the power supply voltage Vcc to the CPUI with the reference voltage, and as the power supply voltage Vcc rises higher than the reference voltage, the latch circuit 6 releases the latch. be done.
従って、前記ラッチ回路６からの切換信号が解除され、
再びＣＰＵＩが切換復帰される。Therefore, the switching signal from the latch circuit 6 is released,
The CPUI is switched back again.
以上の構成によれば、バッテリの劣化時の始動時等で電
源電圧Ｖｃｃが低下して、−時的にＣＰＵ１が異常を来
した際には、バックアップ用制御回路２への切り換えが
可能となることで、始動性の向上を図れ、その後、電源
電圧Ｖｃｃが正常復帰した場合には、バックアップ用制
御回路２の切換が解除されるので、その後の制御に支障
を来すこともない。According to the above configuration, when the power supply voltage Vcc decreases during startup when the battery deteriorates, and the CPU 1 occasionally malfunctions, it is possible to switch to the backup control circuit 2. This improves the startability, and when the power supply voltage Vcc returns to normal after that, switching of the backup control circuit 2 is canceled, so that subsequent control will not be hindered.
〈発明の効果〉
以上説明したように、本発明の自動車用制御装置のＣＰ
Ｕバックアップ装置によれば、バッテリの劣化時の始動
時等で電源電圧が低下して、−時的にＣＰＵが異常を来
した際に、バックアップ用制御回路への切り換えを可能
とし、しかも、電源電圧が正常復帰した場合には、ＣＰ
Ｕに切換復帰させる構成にしたから、始動性の向上並び
にその後の制御性の向上を図ることができる有用外大な
るものである。<Effects of the Invention> As explained above, the CP of the automobile control device of the present invention
According to the U backup device, when the power supply voltage drops during startup when the battery deteriorates and the CPU temporarily malfunctions, it is possible to switch to the backup control circuit, and the power supply When the voltage returns to normal, the CP
Since it is configured to switch back to U, it is extremely useful as it can improve starting performance and subsequent controllability.
第１図は本発明の一実施例を示す構成図、第２図は従来
例の構成図である。
ｌ・・・ＣＰＵ ２・・・バックアップ用制御回路
３・・・切換回路 ４・・・異常判定回路 ５・・
・ラッチ回路 ６・・・電源電圧監視回路 ７・・
・ラッチ回路 ８・・・ＯＲ回路FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example. l...CPU 2...Backup control circuit 3...Switching circuit 4...Abnormality determination circuit 5...
・Latch circuit 6...Power supply voltage monitoring circuit 7...
・Latch circuit 8...OR circuit
Claims (1)
ＰＵとバックアップ用制御回路とを切り換える切換回路
と、ＣＰＵを監視して該ＣＰＵに異常が発生した時にリ
セット信号を供給する監視回路と、該ＣＰＵに供給され
るリセット信号が所定数より多くなった時にＣＰＵから
バックアップ用制御回路に切り換える切換信号を前記切
換回路に出力する切換手段と、を備えてなる自動車用制
御装置のＣＰＵバックアップ装置において、ＣＰＵへの
電源電圧と基準電圧とを比較し、電源電圧が基準電圧よ
りも低下した時にラッチ回路をラッチする信号を出力し
、かつ電源電圧が基準電圧よりも上昇した時にラッチ回
路をラッチ解除する信号を出力する電源電圧監視回路を
設け、前記ラッチ回路からの信号と前記切換手段からの
切換信号とをＯＲ回路を介して前記切換回路に入力させ
るようにしたことを特徴とする自動車用制御装置のＣＰ
Ｕバックアップ装置。a CPU, a backup control circuit for the CPU, and a control circuit for backing up the CPU;
A switching circuit that switches between the PU and a backup control circuit, a monitoring circuit that monitors the CPU and supplies a reset signal when an abnormality occurs in the CPU, and a monitoring circuit that monitors the CPU and supplies a reset signal when the number of reset signals supplied to the CPU exceeds a predetermined number. In a CPU backup device for an automobile control device, the CPU backup device for an automobile control device includes switching means for outputting a switching signal to the switching circuit to switch from the CPU to the backup control circuit when the CPU is switched to the backup control circuit. A power supply voltage monitoring circuit is provided, which outputs a signal to latch the latch circuit when the voltage drops below the reference voltage, and outputs a signal to unlatch the latch circuit when the power supply voltage rises above the reference voltage, and the latch circuit and a switching signal from the switching means are input to the switching circuit via an OR circuit.
U backup device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1319024A JP2873843B2 (en) | 1989-12-11 | 1989-12-11 | CPU backup device for automotive control unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1319024A JP2873843B2 (en) | 1989-12-11 | 1989-12-11 | CPU backup device for automotive control unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03192401A true JPH03192401A (en) | 1991-08-22 |
| JP2873843B2 JP2873843B2 (en) | 1999-03-24 |
Family
ID=18105657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1319024A Expired - Fee Related JP2873843B2 (en) | 1989-12-11 | 1989-12-11 | CPU backup device for automotive control unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2873843B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996028769A1 (en) * | 1995-03-11 | 1996-09-19 | Leuze Electronic Gmbh + Co. | Safety switch arrangement |
-
1989
- 1989-12-11 JP JP1319024A patent/JP2873843B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996028769A1 (en) * | 1995-03-11 | 1996-09-19 | Leuze Electronic Gmbh + Co. | Safety switch arrangement |
| US5777834A (en) * | 1995-03-11 | 1998-07-07 | Leuze Electronic Gmbh+Co. | Safety switch arrangement |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2873843B2 (en) | 1999-03-24 |
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