JPS59217418A - Combustion controller - Google Patents

Combustion controller

Info

Publication number
JPS59217418A
JPS59217418A JP58092181A JP9218183A JPS59217418A JP S59217418 A JPS59217418 A JP S59217418A JP 58092181 A JP58092181 A JP 58092181A JP 9218183 A JP9218183 A JP 9218183A JP S59217418 A JPS59217418 A JP S59217418A
Authority
JP
Japan
Prior art keywords
ram
region
signal
microcomputer
content
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
Application number
JP58092181A
Other languages
Japanese (ja)
Inventor
Kiyoshi Tamura
田村 淑
Shigeo Hatakeyama
畠山 重雄
Kiyoshi Hioki
日置 清
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Noritz Corp
Original Assignee
Noritz Corp
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 by Noritz Corp filed Critical Noritz Corp
Priority to JP58092181A priority Critical patent/JPS59217418A/en
Publication of JPS59217418A publication Critical patent/JPS59217418A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/24Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00Signal processing; Details thereof
    • F23N2223/08Microprocessor; Microcomputer

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Testing And Monitoring For Control Systems (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

PURPOSE:To improve the safety and reliability of the titled controller against noise by setting ''1'' in the unused region of an RAM at the initial time of supplying a current and to constantly check the content of said region. CONSTITUTION:When a flag is alotted to the RAM region within a microcomputer, and an operating signal from the operating circuit 4 continues for a predetermined period of time, the flag is reversed to ''1'' or ''0''. An input signal from the operating circuit and an output signal from an output terminal 9 are set to ''active LOW''. The content of the unused region of the RAM is set at ''1'' immediately after the resetting, and while in operation, the unused region is constantly checked. When even one position is set at ''0'', the region is returned to the reset state. Accordingly, if noise should infiltrate into the microcomputer, and the content of the RAM is broken, the RAM is reset to the initial state. Hence, it is possible to obtain a combustion controller exceedingly stable and reliable against noise.

Description

【発明の詳細な説明】 本発明はマイクロコンピュータを用いた燃焼制御装置に
関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion control device using a microcomputer.

めコンデンサー、ダイオードを用いて対ノイズ対策を行
っている。ところがマイクロコンピュータを用いて操作
回路からの点消火信号、炎検出回路からの炎検出信号等
を受取り、定められた処理手順を行って負荷を制御する
ようにしたものでは、マイクロコンピュータに接続する
外部回路、即ち操作回路、炎検出回路にコンデンサー、
ダイオードを用いてノイズ対策が行えてもマイクルコン
ピュータ自体のノイズ対策は行えず、それ故ノイズが侵
入してマイクロフンピユータが誤動作する問題があった
Measures against noise are taken using capacitors and diodes. However, in a system that uses a microcomputer to receive the ignition/extinguishing signal from the operating circuit, the flame detection signal from the flame detection circuit, etc., and perform predetermined processing procedures to control the load, the external circuits, i.e. operating circuits, capacitors in the flame detection circuits,
Even if noise countermeasures could be taken using diodes, the microcomputer itself could not be countermeasured against noise, and therefore, there was a problem that noise would enter and cause the microcomputer to malfunction.

本発明はかかる従来例の問題を解決せん七するもので、
以下に本発明の構成を具体的に説明する。
The present invention solves the problems of the prior art, and
The configuration of the present invention will be specifically explained below.

(1)はマイクロコンピュータであり、電源ライン(2
)には5vのスイッチングレギュレータ(3)ヲ設けで
ある。(4)は入力端子(5)に接続した操作回路、(
6)は入力端子(7)に接続した炎検出回路、(8)は
燃料弁、点火器等の負荷H徴用のリレーであり、出力端
子(9)とインバータバッファQq並びにトランジスタ
アレイαυを介して接続しである。
(1) is a microcomputer, and the power line (2
) is equipped with a 5V switching regulator (3). (4) is the operation circuit connected to the input terminal (5), (
6) is a flame detection circuit connected to the input terminal (7), (8) is a relay for commanding loads H such as fuel valves and igniters, and is connected to the output terminal (9) through the inverter buffer Qq and transistor array αυ. It is connected.

操作回路(4)は電源ライン間に接続した運転スイッチ
(ロ)と抵抗的の直列回路と、両者の中点をべ−スに接
続したN P N型トランジスタα匂を有し、該トラン
ジスタσ脣のコレクタを入力、i子(5)と接続してあ
り、又コレクタと電源のアースライン間にダイオードα
つを、前記抵抗a4と並列にコンデンサーqQを夫々接
続しである。炎検出回路(6)は炎検出器αη、炎検出
器σηをゲートに接続した電界効果型トランジスタ(至
)、該トランジスタ0印のドレインを非反転入力端子に
接続したコンパレータ09を有し、又非反転入力端子と
アースライン間にコンデンサー(7)を接続し、コンパ
レーク(19+の出力端子を入力端子(7)と接続しで
ある0マイクロコンピユータ(1) 内ではRAM領域
にフラッグ(以下FGと記す)を割当て、操作回路(4
)からの操作信号が一定時間継続した時にFGを1かO
に反転させるようにしである。尚操作回路(4)からの
入力、出力端子(9)からの出力はアクティブLOWと
してあり、又RAMの未使層領域の内容をリセット直後
lにセットして運転中常時上記領域をチェックし、この
時1ケ所でも0になっている場合にはりセット状態(R
AMを初期化)に戻すようにしである。
The operation circuit (4) has an operation switch (b) connected between the power supply lines, a resistive series circuit, an N P N type transistor α connected to the base at the midpoint of the two, and the transistor σ The input terminal is connected to the input terminal (5), and a diode α is connected between the collector and the ground line of the power supply.
A capacitor qQ is connected in parallel with the resistor a4. The flame detection circuit (6) has a flame detector αη, a field effect transistor (to) whose gate is connected to the flame detector ση, and a comparator 09 whose drain of the transistor marked 0 is connected to a non-inverting input terminal. A capacitor (7) is connected between the non-inverting input terminal and the ground line, and the output terminal of the comparator (19+) is connected to the input terminal (7).In the microcomputer (1), a flag (hereinafter referred to as FG) is placed in the RAM area. ) and operate the operation circuit (4).
) when the operation signal from ) continues for a certain period of time, the FG is set to 1 or O.
It should be reversed. The input from the operation circuit (4) and the output from the output terminal (9) are active LOW, and the contents of the unused layer area of the RAM are set to l immediately after reset, and the above area is constantly checked during operation. At this time, if even one place is 0, the beam is set (R
Initialize AM).

以上の構成に基づく作用を以下第2図に示したフローチ
ャートに基づいて説明する。
The operation based on the above configuration will be explained below based on the flowchart shown in FIG.

電源を投入すればRAM領域の内容が全て初期状態にリ
セットされ、リセット直後にRAMの未使用領域の内容
が1にセットされる。次いてRAI4の上記未使用領域
のチェック(以下RA Ii!チェックと記す。)を行
ない、操作回路(4)からの操作信号を入力し、同時に
出力端子(9)並びに図示1.ないトラブル出力端子等
にこれらに対応して割当てたR A M領域の内容を出
力する。そして後述するトラブル出力の有無をチェック
し、更にFGをチェックしてFGがOの時は処理(B)
に戻り、FGが1の時(運転スイッチaのが閉状態)は
処理(E)に移る。処理(E)ではタイマーカウンター
をセットし、次にファンモータのみ通電しくF)、RA
Iφチェックを行なう(G)。次の処理(均ではFGの
チェックを行ない、この時PGが0の場合ζ即ち運転ス
イッチ04が開成して消火モードの場合には処理(埒以
下のポストバージに移行する。FGが1であればタイマ
ーカウンターが設定値に達する迄処理CF)から処理(
1)までの手順が繰り返され、設定値に達すれば処理(
J)に移行して再度タイマーカウンターがセットされ、
出力端子(9)から低レベルの燃焼開始信号が出力され
、リレー(8)が通電作動して燃料弁、点火器が作動し
て点火動作が行われる。点火炎が形成されると電界効果
型トランジスタσ〜が遮断シ、コンパレータα9がm 
出力レベルニ反転シ、入力端子(7)に炎検出信号が入
力される。処理(L)ではこのように炎検出信号が入力
されると処理(P)に移り処理CP)、(Q)が繰り返
し行われてRAIAチェックとPGチェックを行いなが
ら定常燃焼するのである。処理(L)で炎検出されない
場合にはRAMチェックに)、FGチェック(N)が行
われ、タイマーカウンターが設定値に達する迄は処理(
勺〜処理(N)が繰り返され、設定値に達すれば異常と
して処理(功に移行し、安全動作が行われるのである。
When the power is turned on, the contents of the RAM area are all reset to the initial state, and immediately after the reset, the contents of the unused area of the RAM are set to 1. Next, the above-mentioned unused area of the RAI 4 is checked (hereinafter referred to as RA Ii! check), and the operation signal from the operation circuit (4) is input, and at the same time, the output terminal (9) and the 1. The contents of the RAM area allocated corresponding to these are output to the trouble output terminals etc. that are not available. Then, check whether there is a trouble output as described later, further check the FG, and if the FG is O, process (B)
When FG is 1 (operation switch a is closed), the process returns to step (E). In process (E), set the timer counter, then energize only the fan motor (F), RA
Perform Iφ check (G). The next process (at this time, the FG is checked, and if the PG is 0, that is, the operation switch 04 is opened and the fire extinguishing mode is in effect), the process (transfers to the post barge below).If the FG is 1, For example, processing from processing CF) until the timer counter reaches the set value.
The steps up to 1) are repeated, and when the set value is reached, the process (
Shift to J), the timer counter is set again,
A low-level combustion start signal is output from the output terminal (9), the relay (8) is energized, the fuel valve and the igniter are activated, and ignition is performed. When the ignition flame is formed, the field effect transistor σ~ is shut off, and the comparator α9 is turned off.
When the output level is inverted, a flame detection signal is input to the input terminal (7). In process (L), when the flame detection signal is input in this way, the process moves to process (P), and processes CP) and (Q) are repeatedly performed to perform steady combustion while performing RAIA check and PG check. If flame is not detected in processing (L), RAM check) and FG check (N) are performed, and processing continues until the timer counter reaches the set value.
The process (N) is repeated, and when the set value is reached, the process is determined to be abnormal and a safe operation is performed.

処理(T)以下のポストバージの手順は先ず処理(rJ
でタイマーカウンターをセットし、出力端子(9)から
の信号を遮断してファンモータのみに通電し、タイマー
カウンターが設定値に達すればRAMチェック(旬、ト
ラブル出力のチェック(X)、FGのチェック(力を行
って、FGが0の時は処理CB)に、FGが1の時は処
理(E)に移行する。
Processing (T) The following post-barge procedure first involves processing (rJ
Set the timer counter, cut off the signal from the output terminal (9) and energize only the fan motor, and when the timer counter reaches the set value, check the RAM (temporary, trouble output check (X), FG check) (When FG is 0, the process moves to process CB), and when FG is 1, the process moves to process (E).

処理(R)以下の安全動作は図示しない出力端子からト
ラブル信号を出力して例えばリレー(8)の電源ライン
を遮断せしめると共に出力端子(9)からの燃焼信号を
遮断し、電源を遮断しない限り初期のリセット状態に移
行しないようにしであるところで前述したように操作回
路(4)にはダイオードOQ並びにフンテンサーaOを
、炎検出回路(6)にはコンデンサー(4)を接続しで
あるので仮に両回路(4)、(1))にノイズが侵入し
てもダイオードσ9、コンデンサー0Q1(社)により
侵入ノイズが吸収され、従って外部回路でのノイズによ
る誤動作は防止される。加えて本発明によればRAMの
未使用@域に通電当初1をセットし、Ht時RAMの該
領域の内容をチェックするようにして、仮にマイクロコ
ンピュータ(1)にノイズが侵入してRAMの内容が崩
れた場合には初期状態にリセットされるので、ノイズに
対して極めて安全で信頼性のある燃焼制御装置を提供す
ることが出来るのである。
The safe operation following processing (R) is to output a trouble signal from an output terminal (not shown) to cut off the power line of the relay (8), for example, and to cut off the combustion signal from the output terminal (9), unless the power is cut off. In order to prevent the transition to the initial reset state, as mentioned above, the operating circuit (4) is connected to the diode OQ and the heater aO, and the flame detection circuit (6) is connected to the capacitor (4). Even if noise enters the circuits (4), (1)), the intruding noise is absorbed by the diode σ9 and the capacitor 0Q1 (Inc.), thereby preventing malfunctions due to noise in the external circuit. In addition, according to the present invention, 1 is set in the unused @ area of the RAM at the time of energization, and the contents of this area of the RAM are checked during Ht. If the contents are corrupted, it is reset to the initial state, so it is possible to provide a combustion control device that is extremely safe and reliable against noise.

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

第1図は本発明の一実施例を示す電気回路図、第2図は
同フローチャート図である。 (1)懺・・マイクロコンピュータ (4)・・・操作回路 (6)・・・炎検出回路 特許出願人 株式会社 ノーリツ 代表者 太田敏部
FIG. 1 is an electric circuit diagram showing one embodiment of the present invention, and FIG. 2 is a flow chart thereof. (1) Display...Microcomputer (4)...Operation circuit (6)...Flame detection circuit Patent applicant Noritz Co., Ltd. Representative Toshibe Ota

Claims (1)

【特許請求の範囲】 操作回路、炎検出回路等からマイクロコンヒ。 ユータに信号を入力し、この信号に応じて所定の手順で
燃料弁、点火器等の負荷を制御するようにした燃焼制御
装置において、上記マイクロコンピュータのRAMの未
使用領域に通電当?7111成るいはOをセットして、
通電作動時常時RAMの上記領域をチェックするように
した燃焼制御装置。    ゛
[Claims] A microcontroller from an operation circuit, a flame detection circuit, etc. In a combustion control device that inputs a signal to a computer and controls loads such as a fuel valve and igniter according to a predetermined procedure according to the signal, it is necessary to energize an unused area of the RAM of the microcomputer. Set 7111 or O,
A combustion control device that constantly checks the above-mentioned area of RAM during energization operation.゛
JP58092181A 1983-05-24 1983-05-24 Combustion controller Pending JPS59217418A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58092181A JPS59217418A (en) 1983-05-24 1983-05-24 Combustion controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58092181A JPS59217418A (en) 1983-05-24 1983-05-24 Combustion controller

Publications (1)

Publication Number Publication Date
JPS59217418A true JPS59217418A (en) 1984-12-07

Family

ID=14047262

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58092181A Pending JPS59217418A (en) 1983-05-24 1983-05-24 Combustion controller

Country Status (1)

Country Link
JP (1) JPS59217418A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6170320A (en) * 1984-09-13 1986-04-11 Toshiba Heating Appliances Co Safety device in combustion device
JPH01225820A (en) * 1988-03-07 1989-09-08 Rinnai Corp Combustion control device
JPH01178452U (en) * 1988-05-26 1989-12-20

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5491152A (en) * 1977-12-28 1979-07-19 Sony Corp Storage contents discrimination method of memory unit
JPS5788598A (en) * 1980-11-21 1982-06-02 Yokogawa Hokushin Electric Corp Fault detecting method of storage device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5491152A (en) * 1977-12-28 1979-07-19 Sony Corp Storage contents discrimination method of memory unit
JPS5788598A (en) * 1980-11-21 1982-06-02 Yokogawa Hokushin Electric Corp Fault detecting method of storage device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6170320A (en) * 1984-09-13 1986-04-11 Toshiba Heating Appliances Co Safety device in combustion device
JPH01225820A (en) * 1988-03-07 1989-09-08 Rinnai Corp Combustion control device
JPH0629673B2 (en) * 1988-03-07 1994-04-20 リンナイ株式会社 Combustion control device
JPH01178452U (en) * 1988-05-26 1989-12-20

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