JPH0139014B2 - - Google Patents
Info
- Publication number
- JPH0139014B2 JPH0139014B2 JP57072119A JP7211982A JPH0139014B2 JP H0139014 B2 JPH0139014 B2 JP H0139014B2 JP 57072119 A JP57072119 A JP 57072119A JP 7211982 A JP7211982 A JP 7211982A JP H0139014 B2 JPH0139014 B2 JP H0139014B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- solenoid valve
- signal
- microcomputer
- power cutoff
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 16
- 239000000446 fuel Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 7
- 230000005856 abnormality Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 206010017740 Gas poisoning Diseases 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B9/00—Safety arrangements
- G05B9/02—Safety arrangements electric
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Safety Devices In Control Systems (AREA)
- Magnetically Actuated Valves (AREA)
- Regulation And Control Of Combustion (AREA)
Description
【発明の詳細な説明】
本発明は、ガス、石油等の燃料を供給し燃焼を
制御する電磁弁の制御装置に関し、特に電磁弁を
制御する電磁弁制御回路の安全対策に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a solenoid valve that supplies fuel such as gas or oil and controls combustion, and particularly to safety measures for a solenoid valve control circuit that controls the solenoid valve.
従来、ガス燃焼機器に用いられている燃焼制御
用電磁弁は、電源にリレー又は、トランジスタな
どの開閉素子と直列接続した構成で、前記開閉素
子のオン、オフによつて制御を行なつていた。こ
の様な方法では、前記開閉素子にシヨート故障が
発生すれば、生ガスの流出によつてガス中毒、爆
発事故などが発生する危険があつた。前述の様な
事故防止のため、前記開閉素子であるトランジス
タなどをパルス駆動し、トランジスタのベース駆
動入力信号とコレクタ信号とを比較して異常の有
無を判定する手段と、異常発生時に前記電磁弁へ
の電源供給を遮断して電磁弁をオフする電源遮断
手段とを備えていた。しかしながら電源遮断回路
のスイツチング素子にシヨート故障が発生しても
電磁弁をオフすることができないという安全上の
課題があつた。 Conventionally, combustion control solenoid valves used in gas combustion equipment have a configuration in which a switching element such as a relay or a transistor is connected in series to a power source, and control is performed by turning the switching element on and off. . In such a method, if a shot failure occurs in the switching element, there is a risk of gas poisoning, explosion, etc. due to leakage of raw gas. In order to prevent the above-mentioned accidents, there is a means for pulse-driving the transistor, which is the opening/closing element, and comparing the base drive input signal and the collector signal of the transistor to determine the presence or absence of an abnormality. and a power cutoff means for cutting off the power supply to the solenoid valve and turning off the solenoid valve. However, there was a safety problem in that even if a shot failure occurred in the switching element of the power cutoff circuit, the solenoid valve could not be turned off.
本発明は、上記課題を解消するもので、電源遮
断回路の動作状態を電磁弁駆動用トランジスタの
コレクタ出力信号を用いて状態監視することによ
り未然に事故を防止するものである。以下本発明
の一実施例を図面を用いて説明する。 The present invention solves the above problems and prevents accidents by monitoring the operating state of the power cutoff circuit using the collector output signal of the electromagnetic valve driving transistor. An embodiment of the present invention will be described below with reference to the drawings.
第１図に本発明の一実施例の回路図を示す。第
１図において、１は以下に記す制御回路用の直流
電源、２は電磁弁などの負荷用電源である。３は
マイクロコンピユータを主体に構成した制御回路
（以下マイコンと称す。）で３ａ〜３ｄはマイコン
の入出力端子を示す。４は電源遮断回路でバンド
パス・フイルタ機能を有するＦ／Ｖ変換器５と、
トランジスタ６に付勢されるリレー７などのスイ
ツチング素子（７ａはリレー７の接点）とから構
成される。８は電磁弁駆動回路で、マイコン３の
出力端子３ｂの信号で駆動されるトランジスタ１
０によつて電磁弁９を駆動する。１１は前記電磁
弁駆動回路８を構成するトランジスタ１０のコレ
クタ電圧を検出する検出回路で抵抗器１２と１３
及び過大電圧抑制用ツエナーダイオード１４とか
らなる。１５はインバータで、前記ツエナーダイ
オード１４の端子電圧信号を反転してマイコン３
の入力端子３ｄへ入力する。１６は比較器で電磁
弁駆動回路８の駆動信号３ｄとインバータ１５の
出力信号とを排他的論理和ゲート１７で判定し、
マイコン３の入力端子３ｃへ入力する。１８は運
転スイツチである。第２図は第１図に示す制御回
路の各部の出力タイミング図である。図中
“０”、“１”は各出力のオン・オフを示し
“１”がオン状態、“０”がオフ状態を示してい
る。又横軸のｔは経過時間を示す。第２図を用い
て第１図の動作を説明する。時間t0で電源１及び
２を制御回路に印加したとすれば、マイコン３は
初めに検出回路１１の出力電圧をインバータ１５
を介して出力される検出信号１５を入力端子３ｄ
に入力して電源遮断回路４のリレー接点７ａの状
態をチエツクする。リレー接点７ａがオープン状
態であれば検出信号１５は“１”となり、マイコ
ン３が検出信号１５“１”を検出した時間をt1と
すれば、以降Ｆ時間毎に反転するパルス信号を端
子３ａより出力しＦ／Ｖ変換器５へ入力する。パ
ルス信号を第２図３ａに、Ｆ／Ｖ変換器５の出力
を第２図５に示す。Ｆ／Ｖ変換器５の出力は徐々
に上昇して、時間t2でトランジスタ６をオンす
る。故にリレー７がオンされ接点７ａは導通す
る。検出信号１５は、リレー接点７ａの導通によ
つて“０”になる。マイコン３は検出信号１５＝
“０”を検出後、初めて本来の制御目的である燃
焼制御を実行する。時間t3で運転スイツチ１８が
オンされたとすれば、時間Ｆ毎に反転するパルス
信号３ｂを、トランジスタ１０のベースへ印加し
て電磁弁９をオンさせる。運転スイツチ信号、パ
ルス信号、電磁弁の状態を第２図１８，３ｂ，９
に示す。以降マイコン３は電源遮断回路オン用パ
ルス信号３ａ、電磁弁駆動用パルス信号３ｂをマ
イコン３の出力端子３ａ，３ｂから出力しつつ、
電磁弁駆動用パルス信号３ｂと検出信号１５を比
較器１６で比較した比較信号１７を入力端子３ｃ
から入力し、正常・異常判定を行なう。電磁弁駆
動回路８に故障がなければ、比較出力１７の排他
的論理和は“０”であり、マイコン３は電磁弁の
制御を継続する。時間t4でトランジスタ１０がシ
ヨート故障したとすれば、以降の電磁弁駆動用パ
ルス信号３ｂが“０”の時に前記電磁弁駆動信号
３ｂと検出信号１５の間に信号の不一致が生じ、
比較器１６の出力信号１７の排他的論理和は
“１”をマイコン３の入力端子３ｃへ入力する。
マイコン３は比較器１７の出力信号＝“１”があ
らかじめ定めてある時間t6以上連続すれば異常と
判定し、前記判定時間t7以降、全ての出力をオフ
して停止する。電磁弁９は電源遮断回路４のリレ
ー接点７ａがオープンする時間t8でオフされる。 FIG. 1 shows a circuit diagram of an embodiment of the present invention. In FIG. 1, 1 is a DC power source for a control circuit described below, and 2 is a power source for loads such as electromagnetic valves. 3 is a control circuit mainly composed of a microcomputer (hereinafter referred to as a microcomputer), and 3a to 3d indicate input/output terminals of the microcomputer. 4 is a power cutoff circuit, and an F/V converter 5 having a bandpass filter function;
It is composed of a switching element such as a relay 7 (7a is a contact of the relay 7) that is energized by a transistor 6. 8 is a solenoid valve drive circuit, which includes a transistor 1 driven by a signal from the output terminal 3b of the microcomputer 3.
0 drives the solenoid valve 9. Reference numeral 11 denotes a detection circuit for detecting the collector voltage of the transistor 10 constituting the electromagnetic valve drive circuit 8, and includes resistors 12 and 13.
and a Zener diode 14 for suppressing excessive voltage. 15 is an inverter which inverts the terminal voltage signal of the Zener diode 14 and sends it to the microcomputer 3.
input to the input terminal 3d. 16 is a comparator that determines the drive signal 3d of the electromagnetic valve drive circuit 8 and the output signal of the inverter 15 using an exclusive OR gate 17;
Input to input terminal 3c of microcomputer 3. 18 is a driving switch. FIG. 2 is an output timing diagram of each part of the control circuit shown in FIG. 1. In the figure, "0" and "1" indicate on/off of each output, "1" indicates an on state, and "0" indicates an off state. Further, t on the horizontal axis indicates elapsed time. The operation shown in FIG. 1 will be explained using FIG. 2. If power supplies 1 and 2 are applied to the control circuit at time t 0 , the microcomputer 3 first converts the output voltage of the detection circuit 11 to the inverter 15.
The detection signal 15 outputted via the input terminal 3d
input to check the state of relay contact 7a of power cutoff circuit 4. If the relay contact 7a is in an open state, the detection signal 15 becomes "1", and if the time when the microcomputer 3 detects the detection signal 15 "1" is t1 , a pulse signal that is inverted every F time thereafter is sent to the terminal 3a. The signal is outputted from the F/V converter 5 and inputted to the F/V converter 5. The pulse signal is shown in FIG. 2, 3a, and the output of the F/V converter 5 is shown in FIG. 2, 5. The output of F/V converter 5 gradually rises to turn on transistor 6 at time t2 . Therefore, relay 7 is turned on and contact 7a becomes conductive. The detection signal 15 becomes "0" due to the conduction of the relay contact 7a. Microcomputer 3 has detection signal 15=
After detecting "0", combustion control, which is the original control purpose, is executed for the first time. If the operating switch 18 is turned on at time t3 , a pulse signal 3b that is inverted every time F is applied to the base of the transistor 10 to turn on the solenoid valve 9. The operating switch signal, pulse signal, and solenoid valve status are shown in Figure 2, 18, 3b, and 9.
Shown below. Thereafter, the microcomputer 3 outputs a pulse signal 3a for turning on the power cutoff circuit and a pulse signal 3b for driving the solenoid valve from the output terminals 3a and 3b of the microcomputer 3.
A comparison signal 17 obtained by comparing the electromagnetic valve driving pulse signal 3b and the detection signal 15 with the comparator 16 is input to the input terminal 3c.
, and determine whether it is normal or abnormal. If there is no failure in the electromagnetic valve drive circuit 8, the exclusive OR of the comparison output 17 is "0", and the microcomputer 3 continues to control the electromagnetic valve. If the transistor 10 suffers a short failure at time t4 , a signal mismatch occurs between the electromagnetic valve drive signal 3b and the detection signal 15 when the electromagnetic valve drive pulse signal 3b is "0" thereafter.
The exclusive OR of the output signal 17 of the comparator 16 inputs "1" to the input terminal 3c of the microcomputer 3.
The microcomputer 3 determines that there is an abnormality if the output signal of the comparator 17 continues to be "1" for a predetermined time t 6 or more, and after the determination time t 7 all outputs are turned off and stopped. The solenoid valve 9 is turned off at time t8 when the relay contact 7a of the power cutoff circuit 4 opens.
次に第３図を用いて電源遮断回路の故障による
制御回路の動作を説明する。制御回路への電源
１，２を印加した時間t0で電源遮断回路４のオン
用パルス信号３ａを停止しているにもかかわらず
電源遮断回路４のトランジスタ６がシヨート故障
して、リレー７がオン又は接点７ａが溶着してい
た場合、検出回路１１は負荷電源２を抵抗器１
２，１３で分割した電位となり、インバータ１５
の出力は“０”となる。従つてマイコン３は異常
と判定して入力端子３ｄの入力信号が“１”にな
るまで全ての出力信号をオフにして待機する。す
なわち、時間t1を経過してもマイコン３の入力端
子３ｄが“１”にならなければ、以降のシーケン
スに移行せず停止状態を保持することになる。入
力信号３ｄが“１”の時は第２図で示した動作と
なる。この様に電源遮断回路の構成部品の故障に
対して安全性を確保している。 Next, the operation of the control circuit due to a failure in the power cutoff circuit will be explained using FIG. At time t 0 when power supplies 1 and 2 were applied to the control circuit, the transistor 6 of the power cutoff circuit 4 had a short failure even though the ON pulse signal 3a of the power cutoff circuit 4 had been stopped, and the relay 7 If it is on or the contact 7a is welded, the detection circuit 11 connects the load power supply 2 to the resistor 1.
The potential is divided by 2 and 13, and the inverter 15
The output of is "0". Therefore, the microcomputer 3 determines that there is an abnormality and turns off all output signals and waits until the input signal at the input terminal 3d becomes "1". That is, if the input terminal 3d of the microcomputer 3 does not become "1" even after time t1 has elapsed, the stopped state is maintained without proceeding to the subsequent sequence. When the input signal 3d is "1", the operation is as shown in FIG. In this way, safety is ensured against failure of the components of the power cutoff circuit.
次に第１図に記した制御回路であるマイコン３
を実現する処理プログラムを第４図のフローチヤ
ートで説明する。マイコンに電源が印加される
と、「スタート」よりプログラムの実行を開始す
る。初めに本来の燃焼制御に必要な処理を「初期
設定」で行なう。以後３ｄ入力端子から検出信号
を入力し、電源遮断回路をチエツクする。異常が
有り「３ｄ≠１」ならば「３ｄ＝１」まで待機す
る。３ｄ＝１で電源遮断回路を動作するパルス信
号を成生する「タイマＦの設定・起動」を行い、
以後Ｆタイマオーバーフロー毎に「Ｆタイマの再
設定」とパルス信号の反転出力を行う。この期間
はＴタイマがオーバーフローをするか、３ｄ＝０
になるまで行なう。３ｄ＝０で前記処理を終了し
た場合は正常動作であり、本来の燃焼制御を実行
する「ループ」へ移行する。Ｔタイマのオーバー
フローで終了した場合は電源遮断回路に異常があ
つたとして全出力をオフして停止する。「ループ」
ではＦタイマのオーバーフロー毎に「Ｆタイマの
再設定」後、「主プログラム」を実行する。主プ
ログラムは運転スイツチの入力、電磁弁の制御を
含む種々の燃焼制御を実行する。主プログラム終
了からＦタイマオーバーフローまでの残時間で電
磁弁の検出信号のチエツクを行なう。つまり比較
信号を入力端子３ｃより入力し「３ｃ＝０」であ
れば「ループ」へもどり、「３ｃ≠０」ならば
「カウンタをインクリメント」する。「カウンタの
インクリメント」の結果オーバーフローが発生す
れば全出力をオフして停止し、そうでなければル
ープへもどる。なお第２図で示した時間t6は、第
４図のフローチヤートではカウンタで表わしてい
る。 Next, microcomputer 3, which is the control circuit shown in Figure 1,
A processing program for realizing this will be explained with reference to the flowchart shown in FIG. When power is applied to the microcontroller, execution of the program begins by clicking "Start". First, perform the processing necessary for the original combustion control using the "initial settings". After that, input the detection signal from the 3d input terminal and check the power cutoff circuit. If there is an abnormality and "3d≠1", wait until "3d=1". At 3d=1, set and start timer F, which generates a pulse signal that operates the power cutoff circuit.
Thereafter, each time the F timer overflows, "F timer reset" and inverted output of the pulse signal are performed. During this period, the T timer will overflow or 3d=0
Do this until If the process ends with 3d=0, the operation is normal and the process moves to a "loop" in which the original combustion control is executed. If the process ends due to an overflow of the T timer, it is assumed that there is an abnormality in the power cutoff circuit and all outputs are turned off and the process is stopped. "loop"
Then, every time the F timer overflows, the "main program" is executed after "resetting the F timer". The main program executes various combustion controls including operation switch input and solenoid valve control. The solenoid valve detection signal is checked during the remaining time from the end of the main program until the F timer overflows. That is, a comparison signal is input from the input terminal 3c, and if "3c=0", the process returns to "loop", and if "3c≠0", "counter is incremented". If an overflow occurs as a result of "counter increment", all outputs are turned off and the process is stopped; otherwise, the process returns to the loop. Note that the time t6 shown in FIG. 2 is represented by a counter in the flow chart of FIG.
なお、実施例を制御回路であるマイコン３への
電源入切に同期させた例で説明したが、制御回路
を常時通電し、運転スイツチなどに同期させて、
実行するようプログラムを変更すれば同等の機能
を容易に実現できる。 Although the embodiment has been explained using an example in which power is turned on and off to the microcomputer 3, which is a control circuit, the control circuit is constantly energized and synchronized with an operation switch, etc.
Equivalent functionality can be easily achieved by modifying the program to execute it.
この様に本発明によれば、共通の検出信号を利
用して電源印加時に電源遮断回路の回路故障チエ
ツクを、以降電磁弁駆動回路の回路故障チエツク
を行なうことにより、たがいに他方の故障をカバ
ーし、生ガス流出によるガス中毒・爆発等を防止
する高信頼性の電磁弁制御装置を実現させてい
る。 As described above, according to the present invention, a common detection signal is used to check for a circuit failure in the power cutoff circuit when power is applied, and thereafter to check for a circuit failure in the solenoid valve drive circuit, thereby covering up failures in the other circuit. We have created a highly reliable solenoid valve control device that prevents gas poisoning and explosions caused by raw gas leakage.
また電磁弁をパルス駆動することによつて、消
費電力を低減させる効果がある。 Further, by pulse-driving the solenoid valve, there is an effect of reducing power consumption.
第１図は本発明の一実施例の電磁弁の制御装置
を示す回路図、第２図、第３図は第１図の各部の
動作出力タイミング図、第４図は第１図中の制御
回路を実現するフローチヤート図である。
１，２……電源、３……制御回路、４……電源
遮断回路、７……リレー（スイツチング素子）、
８……電磁弁駆動回路、９……電磁弁、１０……
トランジスタ、１１……検出回路、１６……比較
器。
Fig. 1 is a circuit diagram showing a control device for a solenoid valve according to an embodiment of the present invention, Figs. 2 and 3 are operation output timing diagrams of each part in Fig. 1, and Fig. 4 is a control device in Fig. 1. FIG. 3 is a flowchart for realizing the circuit. 1, 2...Power supply, 3...Control circuit, 4...Power cutoff circuit, 7...Relay (switching element),
8... Solenoid valve drive circuit, 9... Solenoid valve, 10...
Transistor, 11...detection circuit, 16...comparator.
Claims (1)
トランジスタの間に接続した電磁弁駆動回路と、
前記電磁弁駆動回路へ供給する直流電源を制御す
るスイツチング素子を設けた電源遮断回路と、前
記電磁弁駆動回路のトランジスタのコレクタ電圧
を検出する検出回路と、前記電源遮断回路の遮断
時に前記検出回路の信号で電源遮断回路のスイツ
チング素子の短絡故障を検出する制御回路とを備
えた電磁弁の制御装置。1. A solenoid valve drive circuit in which a solenoid valve for controlling the supply of fuel, etc. is connected between a DC power source and a transistor;
a power cutoff circuit provided with a switching element that controls a DC power supply to the solenoid valve drive circuit; a detection circuit that detects a collector voltage of a transistor of the solenoid valve drive circuit; and a detection circuit that operates when the power cutoff circuit is cut off. A control device for a solenoid valve, comprising: a control circuit that detects a short-circuit failure of a switching element in a power cutoff circuit using a signal of
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7211982A JPS58190621A (en) | 1982-04-28 | 1982-04-28 | Controller for solenoid valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7211982A JPS58190621A (en) | 1982-04-28 | 1982-04-28 | Controller for solenoid valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58190621A JPS58190621A (en) | 1983-11-07 |
| JPH0139014B2 true JPH0139014B2 (en) | 1989-08-17 |
Family
ID=13480138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7211982A Granted JPS58190621A (en) | 1982-04-28 | 1982-04-28 | Controller for solenoid valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58190621A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2616930B1 (en) * | 1987-06-22 | 1995-06-30 | Renault | SAFETY CONTROL DEVICE OF AN ACTUATOR OF THE SOLENOID SWING SOLENOID TYPE |
| JPH0242101U (en) * | 1988-09-09 | 1990-03-23 | ||
| DE50006421D1 (en) * | 2000-10-06 | 2004-06-17 | Honeywell Bv | control circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51104642A (en) * | 1975-03-12 | 1976-09-16 | Mitsubishi Electric Corp | NENSHOBAANASEIGYO SOCHI |
-
1982
- 1982-04-28 JP JP7211982A patent/JPS58190621A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51104642A (en) * | 1975-03-12 | 1976-09-16 | Mitsubishi Electric Corp | NENSHOBAANASEIGYO SOCHI |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58190621A (en) | 1983-11-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8829710B2 (en) | Starter driving semiconductor switch apparatus | |
| US6297569B1 (en) | Power switching system | |
| US4628885A (en) | Control system | |
| GB1585540A (en) | Solenoid control apparatus | |
| JPH0610432B2 (en) | Fuel cutoff device for engine type vehicle | |
| JPH0139014B2 (en) | ||
| US4384845A (en) | Fail safe digital fuel ignition system | |
| JPS58190620A (en) | Control device for solenoid valve | |
| TWI792783B (en) | Teaching equipment for electromechanical systems | |
| JPS60238616A (en) | Monitoring circuit for combustion device | |
| JP2789009B2 (en) | Gas appliance safety valve control circuit | |
| JPS6235917A (en) | On-vehicle electronic controller | |
| JPS6329699A (en) | Control apparatus of gas clothing dryer | |
| JPH02193532A (en) | Control of charger | |
| JPH0534024Y2 (en) | ||
| JPH0125896Y2 (en) | ||
| JPH0142772Y2 (en) | ||
| JPH0272402A (en) | Wrong output preventing method for digital controller | |
| JPS59217418A (en) | Combustion controller | |
| JPH039901Y2 (en) | ||
| KR200171909Y1 (en) | Safety contact breaker of digital combustion safety controller | |
| JPS60109677A (en) | Solenoid valve driving device | |
| JPS62209630A (en) | Power supply controller | |
| JPH0417783Y2 (en) | ||
| JPH0318838Y2 (en) |