JPH0313830Y2 - - Google Patents

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Publication number
JPH0313830Y2
JPH0313830Y2 JP1981160348U JP16034881U JPH0313830Y2 JP H0313830 Y2 JPH0313830 Y2 JP H0313830Y2 JP 1981160348 U JP1981160348 U JP 1981160348U JP 16034881 U JP16034881 U JP 16034881U JP H0313830 Y2 JPH0313830 Y2 JP H0313830Y2
Authority
JP
Japan
Prior art keywords
signal line
signal
sensor
circuit
diagnostic
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
Application number
JP1981160348U
Other languages
Japanese (ja)
Other versions
JPS5866497U (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP16034881U priority Critical patent/JPS5866497U/en
Publication of JPS5866497U publication Critical patent/JPS5866497U/en
Application granted granted Critical
Publication of JPH0313830Y2 publication Critical patent/JPH0313830Y2/ja
Granted legal-status Critical Current

Links

Description

【考案の詳細な説明】 本考案は、センサ部に信号処理部を接続する信
号線の診断回路に関するものである。
[Detailed Description of the Invention] The present invention relates to a diagnostic circuit for a signal line connecting a signal processing section to a sensor section.

近年、電子技術の発達に伴なつて各種装置に電
子制御が利用される傾向にある。この場合、例え
ば自動車の電子制御に於いては、各種センサを用
いて各種物理量の変化を検出し、信号処理部はこ
の検出信号に対応して燃料供給ポンプ等の各種被
制御対象物の制御を行なつている。
In recent years, with the development of electronic technology, there is a tendency for electronic control to be used in various devices. In this case, for example, in electronic control of automobiles, various sensors are used to detect changes in various physical quantities, and the signal processing section controls various controlled objects such as fuel supply pumps in response to these detection signals. is being carried out.

この場合、自動車あるいは産業機器に於いて
は、センサ部と信号処理部が離れて設けられる場
合が多く、両者の間は信号線によつて接続されて
用いられる。しかしながら、自動車あるいは産業
機器に於いては、その使用条件が過酷であるため
に、上記信号線がしばしば断線してしまう問題を
有している。
In this case, in automobiles or industrial equipment, a sensor section and a signal processing section are often provided separately, and the two are connected by a signal line. However, in automobiles and industrial equipment, there is a problem in that the signal lines are often disconnected due to severe usage conditions.

この場合、信号線の断線は致命的な問題となる
場合があるために、常時監視して断線が発生した
ならばフエールセーフ制御に切り換える必要があ
る。
In this case, a disconnection of the signal line can be a fatal problem, so it is necessary to constantly monitor the signal line and switch to fail-safe control if a disconnection occurs.

しかしながら、信号線の断線診断は極めて難か
しく、簡単な回路構成で確実に検出することが出
来ず、センサ部を信号処理部から離して使用する
場合に於ける問題となつている。
However, diagnosing a disconnection in a signal line is extremely difficult and cannot be detected reliably with a simple circuit configuration, which poses a problem when the sensor section is used at a distance from the signal processing section.

従つて、本考案による目的は、簡単な構成であ
りながら信号線の診断を確実に行なうことが出来
る信号線診断回路を提供することである。
Accordingly, an object of the present invention is to provide a signal line diagnostic circuit that can reliably diagnose signal lines while having a simple configuration.

このような目的を達成するために本考案は、電
源とアース間にセンサ素子とインピーダンス素子
を直列接続することによつて所定入力インピーダ
ンスを有するセンサ部を構成するとともに、信号
処理部から信号線を介してセンサ部に一定周期の
診断パルスを供給し、該診断パルスの発生時に於
ける信号処理部側の信号線電圧を検出することに
よつて診断を行なうものである。以下、図面を用
いて本考案による信号線診断回路を詳細に説明す
る。
In order to achieve such an objective, the present invention constructs a sensor section having a predetermined input impedance by connecting a sensor element and an impedance element in series between a power supply and ground, and also connects a signal line from a signal processing section. Diagnosis is performed by supplying diagnostic pulses of a fixed period to the sensor section through the sensor section, and detecting the signal line voltage on the signal processing section side when the diagnostic pulses are generated. Hereinafter, the signal line diagnostic circuit according to the present invention will be explained in detail with reference to the drawings.

第1図は、本考案による信号線診断回路の一実
施例を示す回路図である。同図に於いて1,2は
センサ部と信号処理部であつて、この両者間は信
号線3によつて接続されている。そして、センサ
部1は、電源+VBとアース間に直列接続された
センサ素子4とインピーダンス素子5によつて構
成されており、両者の接続点電位が信号線3を介
して信号処理部2に送られるように構成されてい
る。
FIG. 1 is a circuit diagram showing an embodiment of a signal line diagnostic circuit according to the present invention. In the figure, 1 and 2 are a sensor section and a signal processing section, and a signal line 3 connects these two. The sensor section 1 is composed of a sensor element 4 and an impedance element 5 that are connected in series between the power supply +V B and the ground, and the potential at the connection point of both is connected to the signal processing section 2 via the signal line 3. configured to be sent.

一方、信号処理部2は、一定周期の診断パルス
Aをダイオード6および抵抗7を介して信号線3
に供給する診断パルス発出回路8と、信号線3に
供給された診断パルスAのレベルが予め定められ
た設定値を越えた場合を断線と判別する断線判別
回路9と、信号線3を介して送られて来るセンサ
部1の出力信号を検出するセンサ信号検出回路1
0とによつて構成されている。そして、診断パル
ス発生回路8は、演算増幅器11、コンデンサ1
2、ダイオード13,14および抵抗15〜19
とによつて構成される一般に周知の矩形波発振回
路によつて構成されており、断線判別回路9は抵
抗20を介して供給される信号線電圧がバツフア
アンプ21のスレツシユホールドレベルVthを越
えた期間に於いてのみ出力を発生するように構成
されている。なお、22はダイオード、23は信
号線3の終端抵抗である。
On the other hand, the signal processing unit 2 transmits the diagnostic pulse A of a constant period to the signal line 3 via the diode 6 and the resistor 7.
A diagnostic pulse generation circuit 8 supplies the diagnostic pulse to A sensor signal detection circuit 1 that detects the sent output signal of the sensor section 1
0. The diagnostic pulse generation circuit 8 includes an operational amplifier 11 and a capacitor 1.
2. Diodes 13, 14 and resistors 15 to 19
The disconnection determination circuit 9 detects when the signal line voltage supplied via the resistor 20 exceeds the threshold level Vth of the buffer amplifier 21. It is configured to generate output only during the period. Note that 22 is a diode, and 23 is a terminating resistor of the signal line 3.

このように構成された信号線診断回路に於い
て、電源が投入されると診断パルス発生回路8が
作動し、演算増幅回路11の出力端から第2図a
に示す一定周期の診断パルスAが発生される。そ
して、この診断パルスAは、逆流防止用のダイオ
ード6および抵抗7を介して信号線3の信号処理
部2側の端部に供給される。この場合、診断パル
ス発生回路8から発生される診断パルスは電源電
圧Vccとほぼアース電位間に於いてオン・オフさ
れる信号となるために、信号線3が正常の場合に
はこの信号線3およびインピーダンス素子5を介
してアースに流れることになる。
In the signal line diagnostic circuit configured in this way, when the power is turned on, the diagnostic pulse generation circuit 8 operates, and the output terminal of the operational amplifier circuit 11 as shown in FIG.
A diagnostic pulse A having a constant period shown in FIG. The diagnostic pulse A is then supplied to the end of the signal line 3 on the signal processing unit 2 side via a backflow prevention diode 6 and a resistor 7. In this case, since the diagnostic pulse generated from the diagnostic pulse generation circuit 8 becomes a signal that is turned on and off between the power supply voltage Vcc and approximately ground potential, when the signal line 3 is normal, this signal line 3 and flows to the ground via the impedance element 5.

この結果、信号線3の電位はインピーダンス素
子5のインピーダンスZ、抵抗7,23の抵抗値
によつて決定されて第2図bに期間T1で示すよ
うに低いレベルの診断パルスとなる。そして、こ
の場合に於ける信号線3の電位は、断線判別部9
を構成するバツフアアンプ21のスレツシユホー
ルドレベルVth以下となり、断線判別部9からは
第2図dに示すように断線検出信号Bは送出され
ない。
As a result, the potential of the signal line 3 is determined by the impedance Z of the impedance element 5 and the resistance values of the resistors 7 and 23, resulting in a low level diagnostic pulse as shown in period T1 in FIG. 2b. In this case, the potential of the signal line 3 is determined by the disconnection determination unit 9.
The threshold level of the buffer amplifier 21 constituting the buffer amplifier 21 becomes lower than the threshold level Vth, and the disconnection detection signal B is not sent out from the disconnection determining section 9 as shown in FIG. 2d.

次に、センサ部1のセンサ素子4が物理量を検
出してオンすると、電源+VBがセンサ素子4お
よび信号線3を介して信号処理部2に供給され
る。従つて、信号線3の電位は第2図bに期間
T2で示すように、センサ素子4のオン期間に於
いて連続的にスレツシユホールドレベルVth以上
の電位に保持される。このようにして連続した
“H”レベルの信号が供給されると、センサ信号
検出回路10が作動して供給信号の周波数、電圧
レベル等を弁別し第2図cに示すセンサ信号Cが
発生される。
Next, when the sensor element 4 of the sensor section 1 detects a physical quantity and turns on, power +V B is supplied to the signal processing section 2 via the sensor element 4 and the signal line 3. Therefore, the potential of the signal line 3 is shown in FIG.
As shown by T 2 , during the ON period of the sensor element 4, the potential is continuously held at the threshold level Vth or higher. When a continuous "H" level signal is supplied in this manner, the sensor signal detection circuit 10 operates to discriminate the frequency, voltage level, etc. of the supplied signal, and generate the sensor signal C shown in FIG. 2c. Ru.

次に、何かの原因によつて信号線3のP点が断
線すると、信号線3からインピーダンス素子5が
切り離されてインピーダンスがほぼ無限大とな
る。この結果、信号処理部2側に於ける信号線3
の電位は、第2図bに期間T3で示すように診断
パルス発生回路8から供給される診断パルスAに
よつて電源レベルとアースレベル間をオン・オフ
するパルス信号となる。そして、このパルス信号
は、スレツシユホールドレベルVthを十分に越え
て変化する信号となるために、バツフアアンプ2
1からは第2図dに示すように診断パルスAに同
期した断線検出信号Bが発生される。また、信号
線3の一部分が断線に至らなくとも腐食や接続部
の接続不良などによる信号線のインピーダンスの
変化により診断パルス信号がバツフアアンプ21
のスレツシユホールドレベルVthを越えるように
設定すれば、信号線が完全に断線する前にこれを
知ることができる。またバツフアアンプ21はセ
ンサ素子4のオン期間T2においても診断パルス
Aよりも幅の広いセンサ信号のパルスが送出され
るが、両パルスは周波数が異るため弁別は容易で
あり、断線判別回路9はセンサ信号検出回路10
を兼ね備えることができ、従つてこの場合センサ
信号検出回路10は削除することができる。
Next, when the point P of the signal line 3 is disconnected for some reason, the impedance element 5 is separated from the signal line 3 and the impedance becomes almost infinite. As a result, the signal line 3 on the signal processing section 2 side
The potential becomes a pulse signal that is turned on and off between the power supply level and the ground level by the diagnostic pulse A supplied from the diagnostic pulse generation circuit 8, as shown by period T3 in FIG. 2b. Since this pulse signal becomes a signal that changes sufficiently beyond the threshold level Vth, the buffer amplifier 2
1, a disconnection detection signal B synchronized with the diagnostic pulse A is generated as shown in FIG. 2d. In addition, even if a part of the signal line 3 does not become disconnected, the diagnostic pulse signal may be lost to the buffer amplifier 21 due to a change in the impedance of the signal line due to corrosion or a poor connection.
By setting the signal line so that it exceeds the threshold level Vth, you can detect this before the signal line is completely disconnected. In addition, the buffer amplifier 21 also sends out a sensor signal pulse that is wider than the diagnostic pulse A during the ON period T2 of the sensor element 4 , but since the two pulses have different frequencies, it is easy to distinguish them. is the sensor signal detection circuit 10
Therefore, in this case, the sensor signal detection circuit 10 can be omitted.

なお、上記回路に於いては診断パルス発生回路
8を演算増幅回路によつて構成し、また断線判別
回路9をバツフアアンプによつて構成した場合に
ついてのみ説明したが、本考案はこれに限定され
るものではなく、いかなる回路によつて達成して
も良いことは言うまでもない。
In the above circuit, only the case where the diagnostic pulse generation circuit 8 is configured by an operational amplifier circuit and the disconnection determination circuit 9 is configured by a buffer amplifier has been described, but the present invention is not limited to this. Needless to say, it is not limited to a specific circuit, and may be achieved by any circuit.

以上説明したように、本考案による信号線診断
回路は、センサ部に一定の出力インピーダンスを
持たせるとともに、信号処理部から信号線に一定
周期の診断パルスを供給し、この診断パルスに対
する信号線の電位を判別することによつて信号線
の断線を判別するるものである。よつて、簡単な
構成でありながら信号線の診断を常時確実に行な
うことが出来る優れた効果を有する。
As explained above, the signal line diagnostic circuit according to the present invention provides a sensor section with a constant output impedance, supplies diagnostic pulses with a constant period to the signal line from the signal processing section, and Disconnection of the signal line is determined by determining the potential. Therefore, although it has a simple configuration, it has the excellent effect of being able to constantly and reliably diagnose signal lines.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本考案による信号線診断回路の一実施
例を示す回路図、第2図a〜dは第1図に示す回
路の各部動作波形図である。 1……センサ部、2……信号処理部、3……信
号線、4……センサ素子、5……インピーダンス
素子、6,22……ダイオード、7,20,23
……抵抗、8……診断パルス発生回路、9……断
線判別回路、10……センサ信号検出回路。
FIG. 1 is a circuit diagram showing an embodiment of a signal line diagnostic circuit according to the present invention, and FIGS. 2a to 2d are operation waveform diagrams of various parts of the circuit shown in FIG. 1. 1... Sensor section, 2... Signal processing section, 3... Signal line, 4... Sensor element, 5... Impedance element, 6, 22... Diode, 7, 20, 23
...Resistor, 8...Diagnostic pulse generation circuit, 9...Disconnection determination circuit, 10...Sensor signal detection circuit.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] センサ素子にインピーダンス素子が接続されて
前記センサ素子の不動作時に於ける出力インピー
ダンスが所定値に設定されたセンサ部と、前記セ
ンサ部の出力に接続された信号線と、前記センサ
部の出力信号を前記信号線を介して取り込む信号
処理部とを備え、前記信号処理部は所定周波数の
診断パルスを前記信号線の電位に応じて前記信号
線を介して前記センサ部に供給する診断パルス発
生回路と、前記信号線の電位が設定値を外れたこ
とを検出して信号線の断線を示すべく前記診断パ
ルスを取出す断線判別回路とによつて構成される
信号線診断回路。
a sensor section in which an impedance element is connected to the sensor element and the output impedance of the sensor element is set to a predetermined value when the sensor element is inactive; a signal line connected to the output of the sensor section; and an output signal of the sensor section. a diagnostic pulse generation circuit that supplies a diagnostic pulse of a predetermined frequency to the sensor unit via the signal line in accordance with the potential of the signal line. and a disconnection determination circuit that detects that the potential of the signal line is out of a set value and extracts the diagnostic pulse to indicate a disconnection of the signal line.
JP16034881U 1981-10-29 1981-10-29 Signal line diagnostic circuit Granted JPS5866497U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16034881U JPS5866497U (en) 1981-10-29 1981-10-29 Signal line diagnostic circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16034881U JPS5866497U (en) 1981-10-29 1981-10-29 Signal line diagnostic circuit

Publications (2)

Publication Number Publication Date
JPS5866497U JPS5866497U (en) 1983-05-06
JPH0313830Y2 true JPH0313830Y2 (en) 1991-03-28

Family

ID=29952760

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16034881U Granted JPS5866497U (en) 1981-10-29 1981-10-29 Signal line diagnostic circuit

Country Status (1)

Country Link
JP (1) JPS5866497U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008080135A (en) * 2006-09-28 2008-04-10 Tyco Healthcare Group Lp Cable monitoring apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07952Y2 (en) * 1988-10-19 1995-01-11 川崎重工業株式会社 Disconnection detector
WO2016207962A1 (en) * 2015-06-23 2016-12-29 株式会社エニイワイヤ Disconnection detecting method for three-wire sensor connection

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421865A (en) * 1977-07-20 1979-02-19 Hitachi Denshi Ltd Discriminating method for transmission line breaking and device breaking

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5046186U (en) * 1973-08-22 1975-05-08

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421865A (en) * 1977-07-20 1979-02-19 Hitachi Denshi Ltd Discriminating method for transmission line breaking and device breaking

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008080135A (en) * 2006-09-28 2008-04-10 Tyco Healthcare Group Lp Cable monitoring apparatus

Also Published As

Publication number Publication date
JPS5866497U (en) 1983-05-06

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