JPH055518A - Regulating method of drive of gas proportional valve of water heater - Google Patents

Abstract

PURPOSE:To facilitate regulation even when the kind of gas is different, by setting a minimum current as a current of a minimum current addition circuit and by setting a maximum current so that a lowest gas pressure reference point be made to coincide by adjusting a plunger of a proportional valve for each kind of gas and that a gas pressure be made the maximum by adjusting the gradient of an F-i pattern modification circuit. CONSTITUTION:First, setting is made so that combustion is minimum. At this time, data from CPU equal 0 and a voltage of 0V is outputted from an F-i pattern modification circuit A. Meanwhile, a minimum current addition circuit B always outputs a voltage corresponding to an MIN current of 20 mA and the current of 20 mA is given to a gas proportional valve at the time of the minimum combustion. Then the position of a zero point is made to coincide by adjusting a plunger of the proportional valve/for each kind of gas so that a measured pressure on the secondary side of the proportional valve be the lowest gas pressure of an effective proportional gas pressure. Next, setting is made so that the combustion is maximum, and adjustment is made by a resistor VR2 for each kind of gas so that the measured pressure on the secondary side of the proportional valve be the maximum gas pressure of the effective proportional gas pressure.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、ガス給湯機に用いられ
るガス比例弁の駆動を調整するガス比例弁の駆動調整方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas proportional valve drive adjusting method for adjusting the drive of a gas proportional valve used in a gas water heater.

【０００２】[0002]

【従来の技術】従来のガス給湯機のガス比例弁の駆動回
路は図４に示す構成であり、ガス比例弁の調整は次のよ
うにして行なっていた。即ち、（Ｉ）まず、最小燃焼と
なるように設定して比例弁電流のＭＩＮである２０ｍＡ
にＭＩＮ調整回路のＶＲ１で調整し、次に比例弁２次圧
を測定圧になるように比例弁のプランジャーで調整す
る。（ＩＩ）最大燃焼となるように設定し、比例弁２次
圧をＭＡＸ測定圧になるようにＭＡＸカット回路のＶＲ
２で電流制御する。2. Description of the Related Art A conventional gas proportional valve drive circuit for a gas water heater has a configuration shown in FIG. 4, and the gas proportional valve is adjusted as follows. That is, (I) First, the minimum combustion is set to 20 mA which is the MIN of the proportional valve current.
Then, it is adjusted by VR1 of the MIN adjusting circuit, and then the secondary pressure of the proportional valve is adjusted by the plunger of the proportional valve so as to become the measured pressure. (II) Set the maximum combustion so that the secondary pressure of the proportional valve becomes the MAX measured pressure, and the VR of the MAX cut circuit is set.
The current is controlled by 2.

【０００３】しかし乍ら、実際のパターンが原点を通る
直線でないため、上記従来の回路の如く、ＭＩＮ調整回
路のＶＲ１で２０ｍＡに調節しようとすると傾きをより
大きくあるいはより小さくするように働き、その結果標
準パターンとの間にずれが生じる。However, since the actual pattern is not a straight line passing through the origin, when the VR1 of the MIN adjusting circuit is adjusted to 20 mA like the above-mentioned conventional circuit, it works to make the inclination larger or smaller. As a result, there is a deviation from the standard pattern.

【０００４】したがって、図６に示すようにＭＡＸ熱負
荷が要求されないにもかかわらずＭＡＸガス量が供給さ
れたり、逆に図５に示すようにＭＡＸ熱負荷が要求され
ているにもかかわらず、ＭＡＸガス量が供給されないと
いう現象となる。Therefore, as shown in FIG. 6, the MAX gas load is supplied even though the MAX heat load is not required, and conversely, although the MAX heat load is required as shown in FIG. The phenomenon is that the amount of MAX gas is not supplied.

【０００５】その結果、ファンと比例弁、即ち空気量と
ガス量のマッチングがとれず空燃費がくずれる。As a result, the fan and the proportional valve, that is, the air amount and the gas amount cannot be matched, and the air fuel consumption is deteriorated.

【０００６】また、例えば１３ＡのガスでＭＩＮ熱負荷
のとき、比例弁に供給される電流が２０ｍＡとなるよう
にＶＲ１を調節しようとすると、ＬＰＧ，６Ｃガスにお
いては図９に示すようにＬＰガスは１６ｍＡ，６Ｃガス
は２２ｍＡとなり、原点がずれてしまう。[0006] Further, for example, when the VR1 is adjusted so that the current supplied to the proportional valve becomes 20 mA when the MIN heat load is applied to the gas of 13 A, as shown in FIG. Is 16 mA and 6 C gas is 22 mA, and the origin is displaced.

【０００７】[0007]

【発明が解決しようとする問題点】発明が解決しようと
する問題点は、ガス比例弁の有効比例ガス圧の最低ガス
圧に例えば１３Ａのガスを基準とし、他のガス種もこの
基準に０点をあわせられるように比例弁電流とガス圧の
比例曲線の傾き修正及び基準点修正を行なう方法を提供
することである。The problem to be solved by the present invention is that the minimum gas pressure of the effective proportional gas pressure of the gas proportional valve is based on a gas of 13 A, for example, and other gas species are also based on this standard. (EN) A method of correcting the slope of a proportional curve of a proportional valve current and a gas pressure and correcting a reference point so that points can be aligned.

【０００８】[0008]

【問題点を解決するための手段】上記問題点を解決する
ために本発明が講ずる技術的手段は、プランジャーの移
動により弁の開度が制御されるガス比例弁において、ガ
ス比例弁を有効比例ガス圧における最低ガス圧を供給す
るのに要する所定の最低電流相当の電圧を作り出すミニ
マム電流付加回路と、駆動回路中にガス比例弁に与えら
れる電流とガス圧の比例曲線の傾きを修正するＦ−ｉパ
ターン修正回路と、上記ミニマム電流付加回路とＦ−ｉ
パターン修正回路を足し合わせる比例弁印加電圧回路を
備えるとともに、最小電流はミニマム電流付加回路の出
力と定め、最大電流は有効比例ガス圧が最低ガス圧にな
るようにガス種毎に比例弁のプランジャーを調節して最
低ガス圧基準点を一致せしめた後、Ｆ−ｉパターン修正
回路の傾きを上下に調節して最大ガス圧となるようにし
て定めることである。[Means for Solving the Problems] The technical means taken by the present invention to solve the above problems is to use a gas proportional valve in a gas proportional valve whose valve opening is controlled by movement of a plunger. A minimum current addition circuit that creates a voltage equivalent to the predetermined minimum current required to supply the minimum gas pressure in proportional gas pressure, and the slope of the proportional curve of the current and gas pressure given to the gas proportional valve in the drive circuit are corrected. F-i pattern correction circuit, minimum current adding circuit, and F-i
A proportional valve applied voltage circuit that adds together pattern correction circuits is provided, the minimum current is defined as the output of the minimum current addition circuit, and the maximum current is the proportional valve plan for each gas type so that the effective proportional gas pressure becomes the minimum gas pressure. After adjusting the jar to match the minimum gas pressure reference point, the tilt of the F-i pattern correction circuit is adjusted up and down to obtain the maximum gas pressure.

【０００９】[0009]

【作用】而して、本発明の上記手段によれば、Ｆ−ｉパ
ターン修正回路により、付加電流とガス圧の比例曲線の
傾きが作られ、ミニマム電流付加回路によりＭＩＮ電
流、例えば２０ｍＡに相当する電圧が作り出され、最小
電流はミニマム電流付加回路の出力と定め、最大電流は
有効比例ガス圧が最低ガス圧になるようにガス種毎に比
例弁のプランジャーを調節して最低ガス圧基準点を一致
せしめた後、Ｆ−ｉパターン修正回路の傾きを上下に調
節して最大ガス圧となるようにして定めることにより、
どんなガス種でも０点位置が一致するパターンになる。According to the above-mentioned means of the present invention, the slope of the proportional curve of the additional current and the gas pressure is created by the Fi pattern correcting circuit, and the minimum current adding circuit corresponds to the MIN current, for example, 20 mA. The minimum current is defined as the output of the minimum current addition circuit, and the maximum current is adjusted by adjusting the plunger of the proportional valve for each gas type so that the effective proportional gas pressure becomes the minimum gas pressure. After making the points coincide, by adjusting the inclination of the F-i pattern correction circuit up and down so that the maximum gas pressure is obtained,
The pattern is such that the 0-point positions match for any gas type.

【００１０】[0010]

【実施例】以下、本発明の実施例を説明する。ガス比例
弁駆動回路は図１に示すようにＣＰＵ Ｅが演算した必
要熱負荷に応じて出力するクロック信号をアナログ信号
にに変換するＤ／Ａ変換器Ｆ、ガス比例弁Ｄに付加され
る電流とガス圧の比例曲線の傾きを修正するＦ−ｉパタ
ーン修正回路Ａ、ガス比例弁Ｄの有効比例ガス圧におけ
る最低ガス圧を供給するのに要する電流を作り出すミニ
マム電流付加回路Ｂ、上記パターン修正回路Ａとミニマ
ム電流付加回路Ｂを足し合わせる比例弁印加電圧回路
Ｃ、及び電圧／電流変換部Ｇとにより構成されており、
その回路構成は図２に示す通りである。EXAMPLES Examples of the present invention will be described below. As shown in FIG. 1, the gas proportional valve driving circuit is a D / A converter F that converts a clock signal output according to the required heat load calculated by the CPU E into an analog signal, and a current added to the gas proportional valve D. And Fi pattern correction circuit A for correcting the slope of the proportional curve of the gas pressure, minimum current addition circuit B for producing the current required to supply the minimum gas pressure at the effective proportional gas pressure of the gas proportional valve D, and the pattern correction The circuit A and the minimum current adding circuit B are added together to form a proportional valve applied voltage circuit C, and a voltage / current conversion unit G.
The circuit configuration is as shown in FIG.

【００１１】而して、この回路において比例弁の調整
は、次のようにして行なう。即ち、（Ｉ）まず、最小燃
焼となるように設定する。このときＣＰＵ Ｅからはデ
ーター＝０となり、Ｆ−ｉパターン修正回路Ａからは０
Ｖの電圧が出力される。一方ミニマム電流付加回路Ｂで
は常にＭＩＮ電流２０ｍＡ相当の電圧が出ており、最小
燃焼時には結局２０ｍＡの電流がガス比例弁Ｄに与えら
れる。The adjustment of the proportional valve in this circuit is performed as follows. That is, (I) First, the setting is made so that the minimum combustion occurs. At this time, data = 0 from the CPU E and 0 from the F-i pattern correction circuit A.
The voltage of V is output. On the other hand, in the minimum current adding circuit B, a voltage corresponding to the MIN current of 20 mA is always output, and a current of 20 mA is eventually given to the gas proportional valve D at the time of minimum combustion.

【００１２】そこで、この電流で比例弁Ｄの二次側測定
圧がその有効比例ガス圧の最低ガス圧になるようにガス
種毎に比例弁Ｄのプランジャーを調節してＭＩＮ調節を
行ない、０点位置を一致せしめる。Therefore, the MIN adjustment is performed by adjusting the plunger of the proportional valve D for each gas type so that the secondary side measured pressure of the proportional valve D becomes the minimum gas pressure of the effective proportional gas pressure by this current. Match the 0 point position.

【００１３】（ＩＩ）次に最大燃焼となるように設定
し、比例弁Ｄの二次側測定圧が有効比例ガス圧の最大ガ
ス圧となるようにガス種毎にＶＲ２で調節する。(II) Next, the maximum combustion is set, and the secondary side measured pressure of the proportional valve D is adjusted by VR2 for each gas type so as to become the maximum gas pressure of the effective proportional gas pressure.

【００１４】[0014]

【効果】本発明によれば、最小ガス圧調整にガス種に関
係なく同じ電流値、例えば２０ｍＡを最低電流として確
保することができるので、有効比例ガス圧が最低ガス圧
になるようにガス種毎に比例弁のプランジャーを調節し
て最低ガス圧基準点を一致せしめた後、Ｆ−ｉパターン
修正回路の傾きを上下に調節して最大ガス圧となるよう
に最大電流を定めることにより、異なるガス種でも容易
に調整を行なうことができる。According to the present invention, the same current value, for example, 20 mA can be secured as the minimum current for the minimum gas pressure adjustment regardless of the gas type, so that the effective proportional gas pressure becomes the minimum gas pressure. After adjusting the plunger of the proportional valve to match the lowest gas pressure reference point for each, adjust the inclination of the F-i pattern correction circuit up and down to determine the maximum current so that the maximum gas pressure is obtained. Adjustment can be easily performed with different gas types.

【００１５】また、比例弁電流と出力ガス圧パターンが
完全に合致し、ＭＡＸ熱負荷が要求されているにもかか
わらず、ＭＡＸガス圧にならなかったり、ＭＡＸ熱負荷
が要求される前にＭＡＸガス圧になってしまうような現
象は生ぜず、従って、空気量とガス量のマッチングが正
確にできる。Further, although the proportional valve current and the output gas pressure pattern are completely matched and the MAX heat load is required, the MAX gas pressure is not reached, or the MAX heat load is required before the MAX heat load is required. The phenomenon that the gas pressure is generated does not occur, and therefore the air amount and the gas amount can be accurately matched.

【図面の簡単な説明】[Brief description of drawings]

【図１】 本発明方法を実施する一実施例を示すガス比
例弁駆動回路のブロック図、FIG. 1 is a block diagram of a gas proportional valve drive circuit showing an embodiment for carrying out the method of the present invention;

【図２】 回路構成図FIG. 2 Circuit configuration diagram

【図３】 本発明方法を実施する回路による各ガス種の
比例弁電流と出力ガス圧との関係を示すグラフ、FIG. 3 is a graph showing the relationship between the proportional valve current of each gas type and the output gas pressure according to the circuit for carrying out the method of the present invention;

【図４】 従来方法を実施するガス比例弁駆動回路の回
路構成図、FIG. 4 is a circuit configuration diagram of a gas proportional valve drive circuit for implementing a conventional method,

【図５】 従来方法を実施するガス比例弁駆動回路によ
りパターンのずれが生じる理由を説明する説明図、FIG. 5 is an explanatory diagram illustrating the reason why a pattern shift occurs due to a gas proportional valve drive circuit that implements a conventional method;

【図６】 従来方法を実施するガス比例弁駆動回路によ
りパターンのずれが生じる理由を説明する説明図、FIG. 6 is an explanatory diagram for explaining the reason why a pattern shift occurs due to a gas proportional valve drive circuit that implements a conventional method;

【図７】 従来方法を実施するガス比例弁駆動回路にお
いて回路のばらつきに起因するパターンのずれの状態を
示す説明図、FIG. 7 is an explanatory diagram showing a state of pattern deviation due to circuit variation in a gas proportional valve drive circuit that implements a conventional method;

【図８】 従来方法を実施するガス比例弁駆動回路にお
いて回路のばらつきに起因するパターンのずれの状態を
示す説明図、FIG. 8 is an explanatory diagram showing a state of pattern deviation due to circuit variation in a gas proportional valve drive circuit that implements a conventional method.

【図９】 従来方法を実施するガス比例弁駆動回路にお
ける各種ガスの比例弁電流と出力ガスとの関係を示すグ
ラフ、である。FIG. 9 is a graph showing a relationship between a proportional valve current of various gases and an output gas in a gas proportional valve drive circuit that implements a conventional method.

【符号の説明】[Explanation of symbols]

Ａ：Ｆ−ｉパターン修正回路、 Ｂ：ミニマム電流
付加回路、Ｃ：比例弁印加電圧回路、 Ｄ：比
例弁。A: F-i pattern correction circuit, B: Minimum current addition circuit, C: Proportional valve applied voltage circuit, D: Proportional valve.

Claims (1)

【特許請求の範囲】 【請求項１】プランジャーの移動により弁の開度が制御
されるガス比例弁において、ガス比例弁を有効比例ガス
圧における最低ガス圧を供給するのに要する所定の最低
電流相当の電圧を作り出すミニマム電流付加回路と、駆
動回路中にガス比例弁に与えられる電流とガス圧の比例
曲線の傾きを修正するＦ−ｉパターン修正回路と、上記
ミニマム電流付加回路とＦ−ｉパターン修正回路を足し
合わせる比例弁印加電圧回路を備えるとともに、最小電
流はミニマム電流付加回路の出力と定め、最大電流は有
効比例ガス圧が最低ガス圧になるようにガス種毎に比例
弁のプランジャーを調節して最低ガス圧基準点を一致せ
しめた後、Ｆ−ｉパターン修正回路の傾きを上下に調節
して最大ガス圧となるようにして定めることを特徴とす
る給湯機のガス比例弁の駆動調整方法。Claim: What is claimed is: 1. A gas proportional valve in which the opening of the valve is controlled by movement of a plunger. The gas proportional valve has a predetermined minimum required to supply a minimum gas pressure in an effective proportional gas pressure. A minimum current addition circuit for generating a voltage equivalent to the current, an F-i pattern correction circuit for correcting the slope of the proportional curve of the current and the gas pressure given to the gas proportional valve in the drive circuit, the minimum current addition circuit and F- The i-pattern correction circuit is added to the proportional valve applied voltage circuit, the minimum current is defined as the output of the minimum current addition circuit, and the maximum current is determined by the proportional valve for each gas type so that the effective proportional gas pressure becomes the minimum gas pressure. After adjusting the plunger to match the lowest gas pressure reference point, the inclination of the F-i pattern correction circuit is adjusted up and down to obtain the maximum gas pressure. Method for adjusting drive of gas proportional valve of water heater.