JPS58168813A - Proportional combustion controlling device - Google Patents
Proportional combustion controlling deviceInfo
- Publication number
- JPS58168813A JPS58168813A JP57049089A JP4908982A JPS58168813A JP S58168813 A JPS58168813 A JP S58168813A JP 57049089 A JP57049089 A JP 57049089A JP 4908982 A JP4908982 A JP 4908982A JP S58168813 A JPS58168813 A JP S58168813A
- Authority
- JP
- Japan
- Prior art keywords
- control valve
- circuit
- fuel control
- combustion
- resistor
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/22—Timing network
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Control Of Combustion (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は主として給湯機器に使用される比例燃焼制御装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a proportional combustion control device mainly used in water heating equipment.
従来のこの稲比例燃焼制御装置は第１図に示すように、
負荷変動検知素子１と、この負荷変動検知素子１からの
信号値と予め設定された設定値とを比較し演算する比較
演算回路２と、この回路２からの信号を入力する燃焼フ
ァン駆動回路３と、この駆動回路３からの信号により駆
動される燃焼ファン４と、この燃焼ファン４からの空気
量を検出するセンｖ５と、このセンｔ５からの信号を入
力する燃料制御弁駆動回路６と、この駆動回路６からの
信号により駆動される燃料制御弁７と、この弁７が送ら
れる燃料とファン４から送られる空気とを混合して燃焼
させる燃焼器８とからなり、前記比較演算回路２、燃焼
ファン駆動回路３および燃料制御弁駆動回路６によシ制
御回路人が形成されている。This conventional rice proportional combustion control device, as shown in Figure 1,
A load change detection element 1, a comparison calculation circuit 2 that compares and calculates a signal value from this load change detection element 1 and a preset setting value, and a combustion fan drive circuit 3 that inputs the signal from this circuit 2. , a combustion fan 4 driven by a signal from this drive circuit 3, a sensor v5 that detects the amount of air from this combustion fan 4, a fuel control valve drive circuit 6 that inputs a signal from this sensor t5, It consists of a fuel control valve 7 driven by a signal from this drive circuit 6, and a combustor 8 that mixes and burns the fuel sent by this valve 7 and the air sent from the fan 4. , the combustion fan drive circuit 3 and the fuel control valve drive circuit 6 form a control circuit.
上記のような構成からなる比例燃焼制御装置では、空燃
比を一定に保つために、負荷変動検知素子１で検知した
負荷信号により燃焼ファン４を介して空気量を制御する
と共に、空気量センサ５で検知した信号によシ、燃料制
御弁７からの燃料量を制御していた。このように空気量
センサ５により空気の実流量を測定しているため、前記
空燃比は一定に保持されるが、その空気量センサ５は高
価であるから、装置全体のコストは高価になる恐れがあ
る。In the proportional combustion control device configured as described above, in order to keep the air-fuel ratio constant, the amount of air is controlled via the combustion fan 4 based on the load signal detected by the load change detection element 1, and the amount of air is controlled by the air amount sensor 5. The amount of fuel from the fuel control valve 7 was controlled based on the signal detected by the fuel control valve 7. Since the actual flow rate of air is measured by the air amount sensor 5 in this way, the air-fuel ratio is kept constant, but since the air amount sensor 5 is expensive, the cost of the entire device may be high. There is.
そこで上記欠点を解消するため、前記空気量センサ５を
省略した第２図に示すような比例燃焼制御装置が考えら
れる。同図のうち第１図に示す符号と同一のものは同一
部分を示すものとする。このような装置では、負荷変動
検知素子ｌで検知した負荷変動信号により、燃焼ファン
４と燃料制御弁７の双方の制御を行う。もちろん定常の
燃焼時および緩慢な負荷変動時には問題はないが、急激
な負荷変動があった場合には、燃焼ファン４の入力変化
に対する応答遅れ時間および燃料制御弁７の応答遅れ時
間が一般的に異なるため、空燃比が過渡的に変動するば
かりでなく、不完全燃焼と振動燃焼を誘起し、極端な場
合には失火する欠点がある。Therefore, in order to eliminate the above-mentioned drawbacks, a proportional combustion control device as shown in FIG. 2, in which the air amount sensor 5 is omitted, can be considered. In this figure, the same reference numerals as those shown in FIG. 1 indicate the same parts. In such a device, both the combustion fan 4 and the fuel control valve 7 are controlled based on the load fluctuation signal detected by the load fluctuation detection element 1. Of course, there is no problem during steady combustion or slow load fluctuations, but when there is a sudden load fluctuation, the response delay time to the input change of the combustion fan 4 and the response delay time of the fuel control valve 7 generally increase. This difference not only causes the air-fuel ratio to fluctuate transiently, but also induces incomplete combustion and oscillating combustion, which has the disadvantage of causing misfire in extreme cases.
本発明は上記欠点を解消することを目的とするもので、
空気量センサを用いない従来の比例燃焼制御装置におい
て、燃焼ファンに対して一般的に短い応答時間を持つ燃
料制御弁の制御信号系路に時間遅れを発生する簡単な遅
延回路を付加したこ １とを特徴とするものである。The present invention aims to eliminate the above-mentioned drawbacks.
In a conventional proportional combustion control device that does not use an air amount sensor, a simple delay circuit that generates a time delay is added to the control signal path of the fuel control valve, which generally has a short response time for the combustion fan.1 It is characterized by the following.
以下本発明の実施例を図面について説明する。Embodiments of the present invention will be described below with reference to the drawings.
第３図および第４図に示す符号のうち第２図に示す符号
と同一のものは同一部分を示すものとする。Among the symbols shown in FIGS. 3 and 4, the same symbols as those shown in FIG. 2 indicate the same parts.
第３図において、９は負荷変動検知信号１からの信号値
および予め設定された設定値を比較し演算する比較演算
回路２と燃料制御弁駆動回路６とを連絡する信号系路、
１０はその信号系路９に設けられた遅延回路で、この遅
延回路１０は抵抗１０と、この抵抗１０の反比較演算回
路側に接続されたコンデンサ１２とにより構成されてい
る。In FIG. 3, reference numeral 9 denotes a signal line connecting the fuel control valve drive circuit 6 and the comparison calculation circuit 2 that compares and calculates the signal value from the load fluctuation detection signal 1 and a preset setting value;
Reference numeral 10 denotes a delay circuit provided in the signal path 9, and this delay circuit 10 is composed of a resistor 10 and a capacitor 12 connected to the anti-comparison arithmetic circuit side of the resistor 10.
その他の構成は第２図に示す従来例と同一であるから説
明を省略する。The rest of the configuration is the same as the conventional example shown in FIG. 2, so the explanation will be omitted.
次に上記のような構成からなる本実施例の作用について
説明する。Next, the operation of this embodiment configured as described above will be explained.
負荷変動検知素子１により検知された負荷変動信号は、
比較演算回路２に入力されて予め設定された設定値と比
較演算される。この比較演算回路２からの信号は燃焼フ
ァン駆動回路３および遅延回路１０を経て燃料制御弁駆
動回路６にそれぞれ入力され、その両駆動回路３，６を
介して燃焼ファン４および燃料制御弁６がそれぞれ駆動
される。The load fluctuation signal detected by the load fluctuation detection element 1 is
The signal is input to the comparison calculation circuit 2 and is compared with a preset value. The signal from the comparison calculation circuit 2 is input to the fuel control valve drive circuit 6 via the combustion fan drive circuit 3 and the delay circuit 10, and the combustion fan 4 and the fuel control valve 6 are operated via both drive circuits 3 and 6. Each is driven.
この燃焼７７ン４および燃料制御弁６によシ負荷に応じ
た空気量および燃料流皺がそれぞれ燃焼器８へ供給され
る。The combustion chamber 4 and the fuel control valve 6 supply the combustor 8 with an amount of air and a flow of fuel depending on the load.
この場合、比較演算回路２からの信号は直接に燃焼ファ
ン駆動回路３に入力されると共に、遅延回路ｌＯを介し
て燃料制御弁駆動回路６に入力され、その両駆動回路３
．６によシ燃焼ファン４および燃料制御弁７がそれぞれ
駆動される。このように燃料制御弁７側では、比較演算
回路２の出力信号は遅延回路１０の抵抗１１の抵抗値お
よびコンデンサ１２の容量により定まる時定数の分だけ
遅れを付加された後に、燃料制御弁駆動回路６に入力さ
れ、この駆動回路６からの出力により燃料制御弁７が駆
動される。In this case, the signal from the comparison calculation circuit 2 is input directly to the combustion fan drive circuit 3, and is also input to the fuel control valve drive circuit 6 via the delay circuit IO, and both drive circuits 3
．． 6, the combustion fan 4 and the fuel control valve 7 are respectively driven. In this way, on the fuel control valve 7 side, the output signal of the comparison calculation circuit 2 is delayed by a time constant determined by the resistance value of the resistor 11 of the delay circuit 10 and the capacitance of the capacitor 12, and then is used to drive the fuel control valve. The output from the drive circuit 6 drives the fuel control valve 7.
前記遅延回路１０の時定数を、燃焼ファン４の入力変化
に対する応答遅れ時間と、燃料制御弁７の応答遅れ時間
との差に等し゛いように設定すれば、負荷変動時におい
ても燃焼ファン４の応答遅れ時間および燃料制御弁７の
応答遅れ時間は等制約に等しくなるため、過渡的な空燃
比の変動はもちろん、不完全燃焼および振動燃焼なども
生じないようにすることができる。If the time constant of the delay circuit 10 is set to be equal to the difference between the response delay time of the combustion fan 4 to an input change and the response delay time of the fuel control valve 7, the combustion fan 4 can be operated even when the load fluctuates. Since the response delay time and the response delay time of the fuel control valve 7 are equal to the same constraint, not only transient air-fuel ratio fluctuations but also incomplete combustion and oscillating combustion can be prevented from occurring.
燃焼ファン４の入力変化に対する応答遅れ時間が、入力
増加時と入力減少時で異なる場合には、第４図に示すよ
うに抵抗１１と、この抵抗１１と並列に設置され、かつ
直列に接続されたダイオード１３および別個の抵抗１４
と、前記抵抗１１゜１４に接続されたコンデンサ１２か
らなる遅延回路１０Ａを使用すればよい。If the response delay time to a change in the input of the combustion fan 4 is different when the input increases and when the input decreases, a resistor 11 is installed in parallel with this resistor 11 and connected in series, as shown in FIG. diode 13 and separate resistor 14
Then, a delay circuit 10A consisting of a capacitor 12 connected to the resistor 11.degree. 14 may be used.
上記遅延回路１０Ａを使用すれば、電流が右方向へ流れ
るときには抵抗１１だけを流れるが、逆に磁流が左方向
へ流れるときには抵抗１１．１４の双方に流れるため、
遅延回路１０Ａの時定数がそれぞれについて異なる。し
たがってそれぞれ時定数を燃焼ファン４および燃料制御
弁７の応答遅れ時間の差に等しく設定すれば、入力の増
加時と減少時の応答遅れ時間の差が異なる場合でも、空
燃比を常にはシ一定に保つことができる。If the delay circuit 10A is used, when the current flows to the right, it flows only through the resistor 11, but when the magnetic current flows to the left, it flows through both the resistors 11 and 14.
The time constants of the delay circuits 10A are different for each. Therefore, if the time constants are set equal to the difference in response delay time of the combustion fan 4 and fuel control valve 7, the air-fuel ratio will always be kept constant even if the difference in response delay time when the input increases and decreases. can be kept.
以上説明したように本発明によれば、燃料制御伸側の信
号系路に極めて簡単な遅延回路を付加することにより、
従来の高価な空気量センサを省略し、定常時はもとより
過渡的な負荷変動時にも、空燃比をはＶ一定に保つこと
ができるので、不完全燃焼および振動燃焼の発生を防止
することができる。As explained above, according to the present invention, by adding an extremely simple delay circuit to the signal path on the fuel control expansion side,
The conventional expensive air flow sensor can be omitted and the air-fuel ratio can be maintained at a constant V not only during normal conditions but also during transient load fluctuations, thereby preventing incomplete combustion and oscillating combustion. .
第１図および第２図は従来の比例燃焼制御装置を示すブ
ロック図、第３図および第４図は本発明の比例燃焼制御
装置の実施例を示すブロック図である。
ｌ・・・負荷変動検知素子、２・・・比較演算回路、３
・・・燃焼ファン駆動回路、４・・・燃焼ファン、６・
・・燃料制御弁駆動回路、７・・・燃料制御弁、８・・
・燃焼器、９・・・信号回路、１０．ＩＯＡ・・・遅延
回路、１１゜１４・・・抵抗、１２・・・コンデンサ、
１３・・・ダイオード。
χ １ （２）
￥Ｅｚ 図
４３ 図
第 ４ 口
１
Ｌ ＪFIGS. 1 and 2 are block diagrams showing a conventional proportional combustion control device, and FIGS. 3 and 4 are block diagrams showing an embodiment of the proportional combustion control device of the present invention. l...Load fluctuation detection element, 2...Comparison calculation circuit, 3
... Combustion fan drive circuit, 4... Combustion fan, 6.
...Fuel control valve drive circuit, 7...Fuel control valve, 8...
- Combustor, 9... Signal circuit, 10. IOA...Delay circuit, 11°14...Resistor, 12...Capacitor,
13...Diode. χ 1 (2) ¥Ez Figure 43 Figure 4 Port 1 L J
Claims (1)
する比較演算回路と、この回路に並列に接続された燃焼
ファン駆動回路および燃料制御弁駆動回路と、この両駆
動回路を介してそれぞれ駆動される燃焼ファンおよび燃
料制御弁と、この燃焼ファンおよび燃料制御弁に接続す
る燃焼器とからなる比例燃焼制御装置において、前記比
較演算回路と燃料制御弁駆動回路とを連絡する信号系路
に信号遅延回路を設けたことを特徴とする比例燃焼制御
装置。 ２、上記遅延回路は信号系路に設けた抵抗と、この抵抗
の反比較演算回路側に接続したコンデンサとからなるこ
とを特徴とする特許請求の範囲第１項記載の比例燃焼制
御装置。 ３、上記遅延回路は信号系路に設けた抵抗と、この抵抗
に並列に、かつ直列に接続されたダイオードおよび別個
の抵抗と、前記両抵抗の反比較演算回路側に接続したコ
ンデンサとからなることを特徴とする特許請求の範囲第
１項記載の比例燃焼制御装置。[Claims] 1. A comparison calculation circuit that compares and calculates the output from the load fluctuation detection element and a set value, a combustion fan drive circuit and a fuel control valve drive circuit connected in parallel to this circuit, and both of these circuits. In a proportional combustion control device comprising a combustion fan and a fuel control valve each driven via a drive circuit, and a combustor connected to the combustion fan and fuel control valve, the comparison calculation circuit and the fuel control valve drive circuit are provided. A proportional combustion control device characterized in that a signal delay circuit is provided in a communicating signal path. 2. The proportional combustion control device according to claim 1, wherein the delay circuit comprises a resistor provided in the signal path and a capacitor connected to the anti-comparison calculation circuit side of the resistor. 3. The delay circuit described above consists of a resistor provided in the signal path, a diode and a separate resistor connected in parallel and in series with this resistor, and a capacitor connected to the anti-comparison calculation circuit side of both of the resistors. A proportional combustion control device according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57049089A JPS58168813A (en) | 1982-03-29 | 1982-03-29 | Proportional combustion controlling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57049089A JPS58168813A (en) | 1982-03-29 | 1982-03-29 | Proportional combustion controlling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58168813A true JPS58168813A (en) | 1983-10-05 |
Family
ID=12821365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57049089A Pending JPS58168813A (en) | 1982-03-29 | 1982-03-29 | Proportional combustion controlling device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58168813A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2599473A1 (en) * | 1986-05-27 | 1987-12-04 | Rinnai Kk | BURNER APPARATUS |
-
1982
- 1982-03-29 JP JP57049089A patent/JPS58168813A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2599473A1 (en) * | 1986-05-27 | 1987-12-04 | Rinnai Kk | BURNER APPARATUS |
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