JP3395982B2 - Water heater combustion control method and apparatus - Google Patents
Water heater combustion control method and apparatusInfo
- Publication number
- JP3395982B2 JP3395982B2 JP33545392A JP33545392A JP3395982B2 JP 3395982 B2 JP3395982 B2 JP 3395982B2 JP 33545392 A JP33545392 A JP 33545392A JP 33545392 A JP33545392 A JP 33545392A JP 3395982 B2 JP3395982 B2 JP 3395982B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- temperature range
- deviation
- constant
- water heater
- 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 - Fee Related
Links
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- Control Of Combustion (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、PID演算による給湯
器の燃焼制御方法およびその装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water heater combustion control method and apparatus thereof by PID calculation.
【0002】[0002]
【従来の技術】図4には一般的な給湯器のシステム構成
が示されている。同図において、燃焼室1内にはバーナ
2が設置され、このバーナ2の下側には給排気を行う燃
焼ファン3が設けられ、バーナ2の上側には熱交換器4
が設けられる。前記バーナ2に通じるガス供給通路5に
は主電磁弁6とガスの供給量を開弁量によって制御する
比例弁8が設けられており、また、熱交換器4の入側に
は給水管10が接続され、この給水管10にはサーミスタ等
の給水温度センサ11と、水の流れと給水水量(出湯量)
を検出する流量センサ13が設けられている。また、熱交
換器4の出側には給湯管14が接続されており、この給湯
管14の出側には水栓15が設けられている。そして、熱交
換器4の出口近傍にはサーミスタ等の出湯湯温を検出す
る出湯温度センサ16が設けられている。2. Description of the Related Art FIG. 4 shows a system configuration of a general water heater. In the figure, a burner 2 is installed in the combustion chamber 1, a combustion fan 3 for supplying and exhausting air is provided below the burner 2, and a heat exchanger 4 is provided above the burner 2.
Is provided. A main solenoid valve 6 and a proportional valve 8 for controlling a gas supply amount by an opening amount are provided in a gas supply passage 5 communicating with the burner 2, and a water supply pipe 10 is provided on an inlet side of the heat exchanger 4. The water supply pipe 10 is connected to the water supply temperature sensor 11 such as a thermistor, the flow of water and the amount of water supplied (amount of hot water discharged).
A flow rate sensor 13 for detecting A hot water supply pipe 14 is connected to the outlet side of the heat exchanger 4, and a water faucet 15 is provided on the outlet side of the hot water supply pipe 14. A hot water temperature sensor 16 for detecting the hot water temperature of a thermistor or the like is provided near the outlet of the heat exchanger 4.
【0003】前記給水温度センサ11と、流量センサ13
と、出湯温度センサ16との各検出信号は制御装置17に加
えられており、制御装置17はこれらの検出信号を受けて
給湯器の燃焼運転を行っている。The water supply temperature sensor 11 and the flow rate sensor 13
The respective detection signals from the hot water outlet temperature sensor 16 are applied to the control device 17, and the control device 17 receives these detection signals and performs the combustion operation of the water heater.
【0004】すなわち、制御装置17は、水栓15が開けら
れて流量センサ13により給水水流が検知されたときに、
燃焼ファン3を回転する。続いて、主電磁弁6を開け、
燃料ガスをバーナ2に供給してイグナイタ電極18を駆動
し、ガスの点火を行う。そして、フレームロッド電極20
から加えられる炎検知信号を受けて着火を確認し、設定
温度と出湯温度との差に対応させて比例弁8の開弁量を
制御し、PID演算を含む比例制御により出湯湯温を設
定温度(この設定温度は、通常、制御装置17のリモコン
によって設定される)に近づけるように燃焼量を制御す
るのである。That is, the control device 17 controls the water supply flow when the water faucet 15 is opened and the flow sensor 13 detects the water supply flow.
The combustion fan 3 is rotated. Then open the main solenoid valve 6,
Fuel gas is supplied to the burner 2 to drive the igniter electrode 18 to ignite the gas. And the frame rod electrode 20
Ignition is confirmed by receiving a flame detection signal added from the controller, the opening amount of the proportional valve 8 is controlled according to the difference between the set temperature and the hot water temperature, and the hot water temperature is set by the proportional control including PID calculation. The combustion amount is controlled so as to approach (the set temperature is usually set by the remote controller of the control device 17).
【0005】最近、給湯器の出湯温度特性の改善が望ま
れ、温度変化のない安定した湯を出湯するために、燃焼
運転の緻密な制御が行われるようになっており、その一
例として、給湯器の出湯温度を検出し、出湯温度が設定
温度の予め与えられた偏差温度範囲に出入りする毎に、
PID演算のPID定数を切り替える方法が提案されて
いる。Recently, it has been desired to improve the hot water discharge temperature characteristic of a water heater, and in order to discharge stable hot water without temperature change, precise control of combustion operation has been carried out. Detecting the hot water temperature of the vessel, every time the hot water temperature goes in and out of the preset deviation temperature range of the set temperature,
A method of switching the PID constant of the PID calculation has been proposed.
【0006】図3はこの提案方法のPID定数切り替え
例を示したもので、給湯器の設定温度が設定されると、
この設定温度に対し、偏差温度範囲が設定温度を中心と
し、その上下両側にかけて設けられる。出湯温度が設定
温度に近付いて偏差温度範囲の下限温度T2 に達する
と、PID演算のPID定数はA1 からA2 に切り替わ
り、A2 のPID定数を用いてPID演算による比例制
御によってバーナ2の燃焼運転が行われる。出湯量の変
動により、出湯温度がさらに上昇し、C2 の点で出湯温
度が偏差温度範囲の上限温度T1 を越えるC2 の点で、
PID定数はA2からA1 に再び切り替わる。このよう
に、出湯温度に応じて、PID定数を切り替えることに
より、燃焼運転の緻密な制御を行おうとするものであ
る。FIG. 3 shows an example of switching the PID constants of this proposed method. When the set temperature of the water heater is set,
With respect to this set temperature, a deviation temperature range is provided centering on the set temperature and extending above and below the set temperature. When the hot water temperature reaches the lower limit temperature T 2 of the deviation temperature range close to a set temperature, PID constants of the PID operation is switched from A 1 to A 2, the burner by a proportional control by PID calculation using the PID constants A 2 2 Combustion operation is performed. Due to the variation of the amount of tapping water, the tapping temperature further rises, and at the point of C 2 , the tapping temperature exceeds the upper limit temperature T 1 of the deviation temperature range at C 2 ,
The PID constant switches from A 2 to A 1 again. In this way, the PID constant is switched according to the outlet heated water temperature to perform precise control of the combustion operation.
【0007】[0007]
【発明が解決しようとする課題】しかしながら、この種
の燃焼制御方法においては、給水流量や給水温度の変動
等に起因して、出湯温度が偏差温度範囲の下限温度T2
又は上限温度T1 の近辺で変動すると、例えば、図3に
示すように、上限温度T1 の近辺で出湯温度が変動し、
出湯温度がC2 ,C3 ,C4 ,C5 等の各点で偏差温度
範囲に出入りすると、その各点でPID定数が頻繁にA
1 とA2 の間で繰り返し切り替わることとなる。このと
き、出湯温度が上限温度T1 よりも低い状態のときはP
ID定数はA2 を用いて制御されるため、出湯温度の変
動に対する比例弁8の駆動電流の操作量は小さいが、出
湯温度が上限温度T1 よりも高くなると、PID定数が
A1に切り替わり、出湯温度の変動に対する比例弁8の
駆動電流の操作量は大きくなる。そのために一時的に給
水流量や給水温度が変動し出湯温度が上限温度T1 を越
えたときには、PID定数がA2 からA1 に切り替わ
り、給水流量や給水温度が元の状態に戻ったとしても出
湯温度が元の温度に戻るまでに時間遅れを生じることか
ら、その間比例弁8を大きな操作量で駆動制御するため
バーナ2へのガス供給量の変化も大きくなり、設定温度
に対する安定性に悪影響を及ぼすという問題があった。However, in this type of combustion control method, due to fluctuations in the feed water flow rate, feed water temperature, etc., the outlet heated water temperature is at the lower limit temperature T 2 of the deviation temperature range.
Alternatively, when the temperature changes in the vicinity of the upper limit temperature T 1 , for example, as shown in FIG. 3, the outlet water temperature changes in the vicinity of the upper limit temperature T 1 ,
When the tapping temperature goes in and out of the deviation temperature range at each point of C 2 , C 3 , C 4 , C 5, etc., the PID constant is frequently A at each point.
It will repeatedly switch between 1 and A 2 . At this time, if the tapping temperature is lower than the upper limit temperature T 1 , P
Since the ID constant is controlled using A 2 , the manipulated variable of the drive current of the proportional valve 8 with respect to the fluctuation of the tapping temperature is small, but when the tapping temperature becomes higher than the upper limit temperature T 1 , the PID constant switches to A 1 . The operation amount of the drive current of the proportional valve 8 with respect to the fluctuation of the tapping temperature becomes large. Therefore, when the water supply flow rate and the water supply temperature temporarily fluctuate and the hot water discharge temperature exceeds the upper limit temperature T 1 , the PID constant switches from A 2 to A 1 , and even if the water supply flow rate and the water supply temperature return to the original state. Since there is a time lag before the outlet heated water temperature returns to the original temperature, the proportional valve 8 is driven and controlled with a large operation amount during that time, so that the change in the gas supply amount to the burner 2 also becomes large and the stability against the set temperature is adversely affected. There was a problem of affecting.
【0008】本発明は上記従来の課題を解決するために
なされたものであり、その目的は、出湯温度が偏差温度
範囲に頻繁に出入りしても、これによって湯温変動が生
じるということがない出湯温度特性のより優れた給湯器
の燃焼制御方法およびその装置を提供することにある。The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is not to cause fluctuations in hot water temperature even if the hot water temperature frequently enters and leaves the deviation temperature range. It is an object of the present invention to provide a combustion control method and apparatus for a water heater, which has a more excellent hot water temperature characteristic.
【0009】[0009]
【課題を解決するための手段】本発明は上記目的を達成
するために、次のように構成されている。すなわち、給
湯器の燃焼制御方法の第1の発明は、給湯器の出湯温度
を検出し、出湯温度が予め与えられている設定温度の偏
差温度範囲に出入りする毎にPID演算による燃焼制御
のPID定数を偏差温度範囲内の方が偏差温度範囲外よ
りも操作量が小さくなる方向に切り替える方式の給湯器
の燃焼制御方法において、出湯温度の上昇時に前記偏差
温度範囲の上側にPID定数の切り替えを行わない切り
替え停止温度幅を設けて、出湯温度の上昇時におけるP
ID定数の切り替えポイントを設定温度に対し上下非対
称に設けたことを特徴として構成されている。また、給
湯器の燃焼制御方法の第2の発明は、給湯器の出湯温度
を検出し、出湯温度が予め与えられている設定温度の偏
差温度範囲に出入りする毎にPID演算による燃焼制御
のPID定数を偏差温度範囲内の方が偏差温度範囲外よ
りも操作量が小さくなる方向に切り替える方式の給湯器
の燃焼制御方法において、出湯温度の下降時に前記偏差
温度範囲の下側にPID定数の切り替えを行わない切り
替え停止温度幅を設けて、出湯温度の下降時におけるP
ID定数の切り替えポイントを設定温度に対し上下非対
称に設けたことを特徴として構成されている。さらに、
給湯器の燃焼制御方法の第3の発明は、給湯器の出湯温
度を検出し、出湯温度が予め与えられている設定温度の
偏差温度範囲に出入りする毎にPID演算による燃焼制
御のPID定数を偏差温度範囲内の方が偏差温度範囲外
よりも操作量が小さくなる方向に切り替える方式の給湯
器の燃焼制御方法において、出湯温度の上昇時に前記偏
差温度範囲の上側にPID定数の切り替えを行わない切
り替え停止温度幅を設けるとともに、出湯温度の下降時
に前記偏差温度範囲の下側にPID定数の切り替えを行
わない切り替え停止温度幅を設けて、出湯温度の上昇時
および下降時におけるPID定数の切り替えポイントを
設定温度に対し上下非対称に設けたことを特徴として構
成されている。さらに、給湯器の燃焼制御装置の第1の
発明は、給湯器の出湯温度を検出し、出湯温度が予め与
えられている設定温度の偏差温度範囲に出入りする毎に
PID演算による燃焼制御のPID定数を偏差温度範囲
内の方が偏差温度範囲外よりも操作量が小さくなる方向
に切り替える方式の給 湯器の燃焼制御装置において、出
湯温度の上昇時に前記偏差温度範囲の上側にPID定数
の切り替えを行わない切り替え停止温度幅を設けて、出
湯温度の上昇時におけるPID定数の切り替えポイント
を設定温度に対し上下非対称に設けたことを特徴として
構成されている。さらに、給湯器の燃焼制御装置の第2
の発明は、給湯器の出湯温度を検出し、出湯温度が予め
与えられている設定温度の偏差温度範囲に出入りする毎
にPID演算による燃焼制御のPID定数を偏差温度範
囲内の方が偏差温度範囲外よりも操作量が小さくなる方
向に切り替える方式の給湯器の燃焼制御装置において、
出湯温度の下降時に前記偏差温度範囲の下側にPID定
数の切り替えを行わない切り替え停止温度幅を設けて、
出湯温度の下降時におけるPID定数の切り替えポイン
トを設定温度に対し上下非対称に設けたことを特徴とし
て構成されている。さらに、給湯器の燃焼制御装置の第
3の発明は、給湯器の出湯温度を検出し、出湯温度が予
め与えられている設定温度の偏差温度範囲に出入りする
毎にPID演算による燃焼制御のPID定数を偏差温度
範囲内の方が偏差温度範囲外よりも操作量が小さくなる
方向に切り替える方式の給湯器の燃焼制御装置におい
て、出湯温度の上昇時に前記偏差温度範囲の上側にPI
D定数の切り替えを行わない切り替え停止温度幅を設け
るとともに、出湯温度の下降時に前記偏差温度範囲の下
側にPID定数の切り替えを行わない切り替え停止温度
幅を設けて、出湯温度の上昇時および下降時におけるP
ID定数の切り替えポイントを設定温度に対し上下非対
称に設けたことを特徴として構成されている。 In order to achieve the above object, the present invention is constructed as follows. That is, salary
A first invention of a hot water heater combustion control method detects a hot water outlet temperature of a hot water heater and sets a PID constant for combustion control by a PID calculation each time the hot water outlet temperature enters and leaves a deviation temperature range of a preset temperature. The deviation temperature range is better than the deviation temperature range.
The combustion control method for water heater system for switching the direction in which remote operation amount is small, by providing a switching stop temperature range that does not perform the switching of PID constants to the upper side of the deviation temperature range at elevated tapping temperature, the tapping temperature P when rising
The ID constant switching point is not paired with the set temperature.
It is characterized by being provided in the name . Also, salary
The second invention of the combustion control method for a water heater is the hot water outlet temperature of the water heater.
Is detected and the hot water temperature is preset to a preset temperature deviation.
Combustion control by PID calculation every time the temperature goes in and out
If the PID constant of is within the deviation temperature range, it is outside the deviation temperature range.
Hot water heater that switches to a direction that reduces the amount of operation
In the combustion control method of No. 1, the deviation is
Cut without switching the PID constant below the temperature range.
By providing a change stop temperature range, P when the tapping temperature falls
The ID constant switching point is not paired with the set temperature.
It is characterized by being provided in the name. further,
A third invention of a combustion control method for a water heater is a hot water outlet temperature of the water heater.
Temperature is detected and the hot water temperature is preset to the preset temperature.
Combustion control by PID calculation every time when entering / leaving deviation temperature range
If the PID constant is within the deviation temperature range, it is outside the deviation temperature range.
Hot water supply system that switches to a direction in which the operation amount becomes smaller than
In the combustion control method for a steam generator,
Off without switching the PID constant above the temperature difference range
A change stop temperature range is provided and when the hot water temperature falls
The PID constant is switched below the deviation temperature range.
When the hot water temperature rises by providing a switching stop temperature range
And the switching point of the PID constant when descending
It is characterized in that it is provided asymmetrically with respect to the set temperature.
Is made. Further, the first of the combustion control device of the water heater
The invention detects the hot water temperature of the hot water supply device and determines the hot water temperature in advance.
Every time you go in and out of the deviation temperature range of the set temperature
Set the PID constant of combustion control by PID calculation to the deviation temperature range.
The operation amount is smaller inside than outside the deviation temperature range
The combustion control device for feeding water instrument system to switch to, out
When the hot water temperature rises, the PID constant is set above the deviation temperature range.
The switching stop temperature range is set so that
Switching point of PID constant when hot water temperature rises
Is characterized by being provided asymmetrically with respect to the set temperature.
It is configured. Furthermore, the second of the combustion control device of the water heater
Of the invention detects the hot water outlet temperature of the water heater,
Every time you enter or leave the deviation temperature range of the given set temperature
The PID constant of combustion control by PID calculation is shown in the deviation temperature range.
One where the manipulated value is smaller inside the enclosure than outside the deviation temperature range
In the combustion control device of the water heater of the type that switches to
When the hot water temperature falls, the PID is set below the deviation temperature range.
By providing a switching stop temperature range that does not switch the number,
Switching point of PID constants when the tap water temperature falls
Is asymmetrical with respect to the set temperature.
Is configured. In addition, the first of the hot water heater combustion control device
In the invention of 3, the hot water temperature of the water heater is detected and the hot water temperature is preset.
In and out of the deviation temperature range of the given set temperature
The PID constant of the combustion control by PID calculation for each deviation temperature
The manipulated variable is smaller within the range than outside the deviation temperature range.
In the combustion control device of the hot-water supply system that changes the direction
Then, when the tapping temperature rises, PI is set above the deviation temperature range.
Provide a switching stop temperature range that does not switch the D constant
And when the tapping temperature falls, below the deviation temperature range
Switching stop temperature without switching the PID constant to the side
The width is set to P when the hot water temperature rises and falls.
The ID constant switching point is not paired with the set temperature.
It is characterized by being provided in the name.
【0010】[0010]
【作用】上記構成の本発明において、給湯器の燃焼運転
時に、例えば、出湯温度が設定温度に次第に近づき、そ
の設定温度の偏差温度範囲に入り込むと、PID演算の
PID定数が切り替わり、この切り替わったPID定数
によりPID演算が行われて給湯燃焼運転が制御され
る。この給湯運転状態で、出湯量の変動等により出湯温
度が変動して偏差温度範囲に対して頻繁に出入りして
も、例えば、出湯温度の上昇時においては偏差温度範囲
の上側に、出湯温度の下降時においては偏差温度範囲の
下側に切り替え停止温度幅が設けられることで、出湯温
度がこの切り替え停止温度幅を越えて変動しない限り、
PID定数は切り替わることがない。これにより、PI
D定数の頻繁な切り替わりに起因する出湯湯温の不安定
化が抑制される。In the present invention having the above-described structure, when the hot water outlet temperature gradually approaches the set temperature and enters the deviation temperature range of the set temperature during the combustion operation of the water heater, the PID constant of the PID calculation is switched and switched. PID calculation is performed by the PID constant to control the hot water supply combustion operation. In this hot-water supply operation state, even in and out frequently against the deviation temperature range tapping temperature is varied by fluctuations in hot water amount, for example, on the upper side of the deviation temperature range during rise of tapping temperature, hot water temperature Of the deviation temperature range
By providing the switching stop temperature range on the lower side, unless the hot water temperature fluctuates beyond this switching stop temperature range,
The PID constant does not switch. This allows PI
Instability of hot water temperature due to frequent switching of the D constant is suppressed.
【0011】[0011]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。なお、本実施例の説明において、前記図4に示す
システム部分と同一の部分には同一符号を付し、その重
複説明は省略する。本実施例の方法を適用する給湯器は
前記図4に示すものと同様なシステム構成となってお
り、本実施例の特徴的なことは、制御装置17のPID演
算によるPID定数の切り替え制御手法を特有な構成と
したものであり、それ以外は従来例と同様である。Embodiments of the present invention will be described below with reference to the drawings. In the description of this embodiment, the same parts as those of the system shown in FIG. 4 are designated by the same reference numerals, and the duplicated description thereof will be omitted. The water heater to which the method of the present embodiment is applied has the same system configuration as that shown in FIG. 4, and the characteristic of the present embodiment is that the PID constant switching control method by the PID calculation of the control device 17 is performed. Is a unique configuration, and other than that is the same as the conventional example.
【0012】図1は本実施例の特徴的なPID演算を用
いた制御部分の構成を示したもので、この制御部分はP
ID定数切り替え部22と、燃焼制御部23とを有してい
る。PID定数切り替え部22には、図2に示すように、
出湯湯温の設定温度に応じて、この設定温度の偏差温度
範囲の上側と下側の温度領域に予め指定されているPI
D定数の切り替え停止温度幅24a,24bが設けられてお
り、この切り替え停止温度幅24aの下側温度領域にはA
1 のPID定数が与えられ、偏差温度範囲にはA2 のP
ID定数が与えられ、さらに切り替え停止温度幅24bの
上側の温度領域にはA1 のPID定数が与えられてい
る。PID定数切り替え部22は出湯温度センサ16から出
湯温度の検出信号を受け、出湯温度が切り替え停止温度
幅24aよりも下のときにはA1 、偏差温度範囲のときに
はA2 、切り替え停止温度幅24bよりも高温のときには
A1 のPID定数をそれぞれ選定し、この選定したPI
D定数を燃焼制御部23に加える。燃焼制御部23はPID
定数切り替え選定部22により切り替え選定されたPID
定数を用いてPID演算により比例弁8の開弁量を制御
し、比例制御によって給湯器の燃焼運転を行う。FIG. 1 shows the configuration of a control portion using the characteristic PID calculation of this embodiment. This control portion is P
It has an ID constant switching unit 22 and a combustion control unit 23. In the PID constant switching unit 22, as shown in FIG.
Depending on the set temperature of the hot water temperature, the PI specified in advance in the upper and lower temperature regions of the deviation temperature range of the set temperature
Switching stop temperature widths 24a and 24b of the D constant are provided, and A is set in the lower temperature region of the switching stop temperature width 24a.
PID constant of 1 is given, and P of A 2 is in the deviation temperature range.
The ID constant is given, and the PID constant of A 1 is given in the temperature region above the switching stop temperature width 24b. The PID constant switching unit 22 receives a detection signal of the tapping temperature from the tapping temperature sensor 16, and when the tapping temperature is lower than the switching stop temperature range 24a, A 1 , when the deviation temperature range is A 2 , and the switching stop temperature range 24b. When the temperature is high, the PID constant of A 1 is selected, and the selected PI
The D constant is added to the combustion control unit 23. Combustion control unit 23 is PID
PID switched and selected by the constant switching selection unit 22
The valve opening amount of the proportional valve 8 is controlled by PID calculation using a constant, and the combustion operation of the water heater is performed by proportional control.
【0013】次に、本実施例におけるPID定数の切り
替え動作について説明する。図2に示すように、出湯温
度が設定温度に徐々に近づき、C1 の点で、出湯温度が
偏差温度範囲に入ると、PID定数はA1 からA2 に切
り替わり、このA2 のPID定数を用いて燃焼制御部23
によりPID演算による比例制御でバーナ2の燃焼駆動
が行われる。このPID定数の切り替え後、出湯湯温が
さらに上昇し、偏差温度範囲を越えて上側の切り替え停
止温度幅24b内に入っても、この切り替え停止温度幅24
b内は、PID定数の切り替えが停止される区間なの
で、C2 ,C3 ,C4 ,C5 に示すように、出湯温度が
偏差温度範囲と上側の切り替え停止温度幅24aの間を繰
り返し出入りしても、出湯温度が上側の切り替え停止温
度幅24bを越えない限りはPID定数は切り替えられ
ず、A2 の状態を維持し、さらに出湯温度が上昇しC5
の点から切り替え停止温度幅24bを越えると、PID定
数はA2 からA1 に切り替えられる。Next, the switching operation of the PID constants in this embodiment will be described. As shown in FIG. 2, the hot water temperature approaches gradually to the set temperature, in terms of C 1, the hot water temperature enters the deviation temperature range, PID constants switches from A 1 to A 2, PID constants of the A 2 Using the combustion control unit 23
Thus, the burner 2 is driven for combustion by proportional control by PID calculation. After the switching of the PID constants, even if the hot water temperature rises further and exceeds the deviation temperature range and enters the upper switching stop temperature width 24b, the switching stop temperature width 24
Since b is a section in which the switching of the PID constant is stopped, as shown in C 2 , C 3 , C 4 , and C 5 , the tapping temperature repeatedly enters and leaves between the deviation temperature range and the upper switching stop temperature range 24a. Even if the tapping temperature does not exceed the upper switching stop temperature range 24b, the PID constant cannot be switched, the state of A 2 is maintained, and the tapping temperature further rises to C 5
From this point, when the switching stop temperature range 24b is exceeded, the PID constant is switched from A 2 to A 1 .
【0014】次に出湯温度が低下してC5′を越えて切
り替え停止温度幅24b内に入ってもPID定数は切り
替えられず、C6の点を越えて切り替え停止温度幅24
bの下限温度よりも降下したときに、A1からA2に切
り替えられることになり、その後C7の点を越えて下側
の切り替え停止温度幅24aの範囲内にあるときは、P
ID定数はA2を維持し、さらにC8の点を越えて切り
替え停止温度幅24a以下になったときにA2からA1
に切り替えられる。Next, the PID constant cannot be switched even if the tapping temperature falls below C 5 ′ and enters the switching stop temperature range 24b, and the switching stop temperature range 24 exceeds the C 6 point.
When the temperature falls below the lower limit temperature of b, the temperature is switched from A 1 to A 2 , and after that, when the temperature exceeds the point of C 7 and is within the range of the lower switching stop temperature width 24a, P
The ID constant is maintained at A 2 , and when the switching stop temperature range 24a or less is exceeded beyond the point of C 8 , A 2 to A 1
Can be switched to.
【0015】このように、本実施例は、設定温度の偏差
温度範囲の上下両側に切り替え停止温度幅24a,24bを
設けたので、給水流量や給水温度の変動等により、出湯
温度が偏差温度範囲の内側と外側に頻繁に出入りして
も、PID定数がその都度頻繁に切り替わるということ
がなくなり、これにより、出湯湯温の変動も抑制される
ので、給湯器の出湯温度特性をより安定化させることが
できる。As described above, in this embodiment, the switching stop temperature widths 24a and 24b are provided above and below the deviation temperature range of the set temperature. The PID constant does not change frequently each time even when the hot water goes in and out of the hot spring, and fluctuations in the hot water temperature of the hot water supply are suppressed as a result, so that the hot water temperature characteristics of the water heater are more stabilized. be able to.
【0016】なお、本発明は上記実施例に限定されるこ
とはなく、様々な実施の態様を採り得る。例えば、上記
実施例では単機能の給湯器を対象にして説明したが、本
発明は追い焚き機能と給湯機能とを備えた複合給湯器に
ついても適用されるものである。The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, although the above embodiment has been described for a single-function water heater, the present invention is also applicable to a combined water heater having a reheating function and a hot water supply function.
【0017】また、上記実施例では、切り替え停止温度
幅24aの下側の出湯温度のときのPID定数と上側の切
り替え停止温度幅24bよりも高い温度のときのPID定
数をともにA1 にしたが、これを互いに異なるPID定
数により設定してもよいことは勿論のことである。Further, in the above embodiment, the PID constant at the tapping temperature on the lower side of the switching stop temperature width 24a and the PID constant at a temperature higher than the switching stop temperature width 24b on the upper side are both A 1. Of course, this may be set by different PID constants.
【0018】[0018]
【発明の効果】本発明は、出湯温度の上昇時における設
定温度の偏差温度範囲の上側にPID定数の切り替えを
行わない切り替え停止温度幅を設けるか、又は、出湯温
度の下降時における設定温度の偏差温度範囲の下側にP
ID定数の切り替えを行わない切り替え停止温度幅を設
けるか、又は、出湯温度の上昇時における設定温度の偏
差温度範囲の上側にPID定数の切り替えを行わない切
り替え停止温度幅を設けるとともに、出湯温度の下降時
における設定温度の偏差温度範囲の下側にPID定数の
切り替えを行わない切り替え停止温度幅を設けたもので
あるから、出湯量等の変動により、出湯温度が偏差温度
範囲の内側と外側を頻繁に出入りしても、切り替え停止
温度幅を越えて出湯温度が変動しない限り、PID定数
が切り替わることがないので、従来例のように、出湯温
度が偏差温度範囲に出入り変動する毎にPID定数が切
り替わって出湯湯温が変動するという問題を防止するこ
とができ、給湯器の出湯湯温のより安定化を達成するこ
とができる。The present invention exhibits, the switching of the PID constant in the upper side of the deviation temperature range set <br/> constant temperature during rise of tapping temperature
Provide a switching stop temperature range that does not occur or the hot water temperature
P on the lower side of the deviation temperature range of the set temperature when the temperature decreases
Set the switching stop temperature range that does not switch the ID constant.
Or the deviation of the set temperature when the hot water temperature rises.
Off without switching the PID constant above the temperature difference range
A change stop temperature range is provided and when the hot water temperature falls
Since the switching stop temperature range in which the PID constant is not switched is provided below the deviation temperature range of the set temperature in , the tapping temperature frequently changes between the inside and outside of the deviation temperature range due to variations in the tapping amount. Even when moving in and out, the PID constant does not change unless the hot water temperature fluctuates beyond the switching stop temperature range. Therefore, as in the conventional example, the PID constant changes every time the hot water temperature moves in and out of the deviation temperature range. It is possible to prevent the problem that the hot water temperature of the hot water supply fluctuates, and it is possible to further stabilize the hot water temperature of the hot water supply device.
【図1】本発明の方法を実行する制御部分の一例を示す
ブロック構成図である。FIG. 1 is a block diagram showing an example of a control unit that executes a method of the present invention.
【図2】本実施例におけるPID演算のPID定数切り
替え動作の説明図である。FIG. 2 is an explanatory diagram of a PID constant switching operation of PID calculation in the present embodiment.
【図3】従来の燃焼制御方法によるPID定数の切り替
え動作の説明図である。FIG. 3 is an explanatory diagram of a PID constant switching operation according to a conventional combustion control method.
【図4】一般的な給湯器のシステム説明図である。FIG. 4 is an explanatory view of a system of a general water heater.
16 出湯温度センサ 17 制御装置 22 PID定数切り替え部 23 燃焼制御部 16 Hot water temperature sensor 17 Controller 22 PID constant switching unit 23 Combustion control unit
フロントページの続き (56)参考文献 特開 昭61−295458(JP,A) 特開 平2−275226(JP,A) 特開 昭57−131920(JP,A) 特開 昭60−71849(JP,A) (58)調査した分野(Int.Cl.7,DB名) F23N 5/14 F24H 1/10 Continuation of front page (56) Reference JP-A-61-295458 (JP, A) JP-A-2-275226 (JP, A) JP-A-57-131920 (JP, A) JP-A-60-71849 (JP , A) (58) Fields surveyed (Int.Cl. 7 , DB name) F23N 5/14 F24H 1/10
Claims (6)
予め与えられている設定温度の偏差温度範囲に出入りす
る毎にPID演算による燃焼制御のPID定数を偏差温
度範囲内の方が偏差温度範囲外よりも操作量が小さくな
る方向に切り替える方式の給湯器の燃焼制御方法におい
て、出湯温度の上昇時に前記偏差温度範囲の上側にPI
D定数の切り替えを行わない切り替え停止温度幅を設け
て、出湯温度の上昇時におけるPID定数の切り替えポ
イントを設定温度に対し上下非対称に設けたことを特徴
とする給湯器の燃焼制御方法。1. A detects the hot water temperature of the water heater, the hot water temperature is a PID constant combustion control by PID calculation deviation temperature every time out of the deviation temperature range of the set temperature given in advance
The manipulated variable is smaller within the temperature range than outside the deviation temperature range.
That the combustion control method for water heater system for switching the direction, PI on the upper side of the deviation temperature range at elevated tapping temperature
By providing a switching stop temperature range in which the D constant is not switched , the PID constant switching po
A combustion control method for a water heater, wherein the inlet is provided asymmetrically with respect to a set temperature .
予め与えられている設定温度の偏差温度範囲に出入りすEnter / exit the deviation temperature range of the preset temperature
る毎にPID演算による燃焼制御のPID定数を偏差温The PID constant of combustion control by PID calculation
度範囲内の方が偏差温度範囲外よりも操作量が小さくなThe manipulated variable is smaller within the temperature range than outside the deviation temperature range.
る方向に切り替える方式の給湯器の燃焼制御方法においIn the combustion control method of the water heater that switches to the direction
て、出湯温度の下降時に前記偏差温度範囲の下側にPIThen, when the temperature of tapping water falls, PI is set below the deviation temperature range.
D定数の切り替えを行わない切り替え停止温度幅を設けProvide a switching stop temperature range that does not switch the D constant
て、出湯温度の下降時におけるPID定数の切り替えポTo change the PID constant when the tap water temperature falls.
イントを設定温度に対し上下非対称に設けたことを特徴The int is vertically asymmetric with respect to the set temperature.
とする給湯器の燃焼制御方法。Combustion control method for water heater.
予め与えられている設定温度の偏差温度範囲に出入りすEnter / exit the deviation temperature range of the preset temperature
る毎にPID演算による燃焼制御のPID定数を偏差温The PID constant of combustion control by PID calculation
度範囲内の方が偏差温度範囲外よりも操作量が小さくなThe manipulated variable is smaller within the temperature range than outside the deviation temperature range.
る方向に切り替える方式の給湯器の燃焼制御方法においIn the combustion control method of the water heater that switches to the direction
て、出湯温度の上昇時に前記偏差温度範囲の上側にPIThen, when the tapping temperature rises, PI is set above the deviation temperature range.
D定数の切り替えを行わない切り替え停止温度幅を設けProvide a switching stop temperature range that does not switch the D constant
るとともに、出湯温度の下降時に前記偏差温度範囲の下And when the tapping temperature falls, below the deviation temperature range
側にPID定数の切り替えを行わない切り替え停止温度Switching stop temperature without switching the PID constant to the side
幅を設けて、出湯温度の上昇時および下降時におけるPThe width is set to P when the hot water temperature rises and falls.
ID定数の切り替えポイントを設定温度に対し上下非対The ID constant switching point is not paired with the set temperature.
称に設けたことを特徴とする給湯器の燃焼制御方法。A method for controlling combustion in a water heater characterized in that it is provided in the name of the water heater.
予め与えられている設定温度の偏差温度範囲に出入りすEnter / exit the deviation temperature range of the preset temperature
る毎にPID演算による燃焼制御のPID定数を偏差温The PID constant of combustion control by PID calculation
度範囲内の方が偏差温度範囲外よりも操作量が小さくなThe manipulated variable is smaller within the temperature range than outside the deviation temperature range.
る方向に切り替える方式の給湯器の燃焼制御装置においIn the combustion control device of the water heater that changes the direction
て、出湯温度の上昇時に前記偏差温度範囲の上側にPIThen, when the tapping temperature rises, PI is set above the deviation temperature range.
D定数の切り替えを行わない切り替え停止温度幅を設けProvide a switching stop temperature range that does not switch the D constant
て、出Out 湯温度の上昇時におけるPID定数の切り替えポSwitch PID constant when hot water temperature rises
イントを設定温度に対し上下非対称に設けたことを特徴The int is vertically asymmetric with respect to the set temperature.
とする給湯器の燃焼制御装置。Combustion control device for water heater.
予め与えられている設定温度の偏差温度範囲に出入りすEnter / exit the deviation temperature range of the preset temperature
る毎にPID演算による燃焼制御のPID定数を偏差温The PID constant of combustion control by PID calculation
度範囲内の方が偏差温度範囲外よりも操作量が小さくなThe manipulated variable is smaller within the temperature range than outside the deviation temperature range.
る方向に切り替える方式の給湯器の燃焼制御装置においIn the combustion control device of the water heater that changes the direction
て、出湯温度の下降時に前記偏差温度範囲の下側にPIThen, when the temperature of tapping water falls, PI is set below the deviation temperature range.
D定数の切り替えを行わない切り替え停止温度幅を設けProvide a switching stop temperature range that does not switch the D constant
て、出湯温度の下降時におけるPID定数の切り替えポTo change the PID constant when the tap water temperature falls.
イントを設定温度に対し上下非対称に設けたことを特徴The int is vertically asymmetric with respect to the set temperature.
とする給湯器の燃焼制御装置。Combustion control device for water heater.
予め与えられている設定温度の偏差温度範囲に出入りすEnter / exit the deviation temperature range of the preset temperature
る毎にPID演算による燃焼制御のPID定数を偏差温The PID constant of combustion control by PID calculation
度範囲内の方が偏差温度範囲外よりも操作量が小さくなThe manipulated variable is smaller within the temperature range than outside the deviation temperature range.
る方向に切り替える方式の給湯器の燃焼制御装置においIn the combustion control device of the water heater that changes the direction
て、出湯温度の上昇時に前記偏差温度範囲の上側にPIThen, when the tapping temperature rises, PI is set above the deviation temperature range.
D定数の切り替えを行わない切り替え停止温度幅を設けProvide a switching stop temperature range that does not switch the D constant
るとともに、出湯温度の下降時に前記偏差温度範囲の下And when the tapping temperature falls, below the deviation temperature range
側にPID定数の切り替えを行わない切り替え停止温度Switching stop temperature without switching the PID constant to the side
幅を設けて、出湯温度の上昇時および下降時におけるPThe width is set to P when the hot water temperature rises and falls.
ID定数の切り替えポイントを設定温度に対し上下非対The ID constant switching point is not paired with the set temperature.
称に設けたことを特徴とする給湯器の燃焼制御装置。Combustion control device for water heater characterized in that it is provided in the name.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33545392A JP3395982B2 (en) | 1992-11-20 | 1992-11-20 | Water heater combustion control method and apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33545392A JP3395982B2 (en) | 1992-11-20 | 1992-11-20 | Water heater combustion control method and apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06159670A JPH06159670A (en) | 1994-06-07 |
JP3395982B2 true JP3395982B2 (en) | 2003-04-14 |
Family
ID=18288731
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Application Number | Title | Priority Date | Filing Date |
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JP33545392A Expired - Fee Related JP3395982B2 (en) | 1992-11-20 | 1992-11-20 | Water heater combustion control method and apparatus |
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Country | Link |
---|---|
JP (1) | JP3395982B2 (en) |
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1992
- 1992-11-20 JP JP33545392A patent/JP3395982B2/en not_active Expired - Fee Related
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