JP3794118B2 - Air conditioning control device - Google Patents

Air conditioning control device Download PDF

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JP3794118B2
JP3794118B2 JP22994997A JP22994997A JP3794118B2 JP 3794118 B2 JP3794118 B2 JP 3794118B2 JP 22994997 A JP22994997 A JP 22994997A JP 22994997 A JP22994997 A JP 22994997A JP 3794118 B2 JP3794118 B2 JP 3794118B2
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valve
valve opening
target value
drive signal
approximately
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JPH1163630A (en
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芳郎 高須賀
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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  • Air Conditioning Control Device (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a controller for air conditioning wherein the effect on a temperature regulating operation by an operation of calibration is reduced. SOLUTION: CPU 11 outputs a drive signal for opening or closing a chilled water valve 7 or a hot water valve 8 to a chilled water valve driving part 22a or a hot water valve driving part 22b from a digital output part 10 and makes the chilled water driving part 22a or the hot water driving part 22b open or close the chilled water valve 7 or the hot water valve 8 respectively. Herein the CPU 11 executes an operation of calibration for making the present valve travel (logical value of valve travel) of each valve 7 or 8 obtained by computation be in accord with the actual valve travel thereof only when a target value of the valve travel of each valve 7 or 8 obtained by computation is 0 or 100%.

Description

【０００１】
【発明の属する技術分野】
本発明は、冷水又は温水と空気との間で熱交換を行う熱交換手段に冷水又は温水を供給する冷水弁又は温水弁の弁開度を調節して空気の温度を制御する空気調和制御装置に関するものである。
【０００２】
【従来の技術】
従来より、連続した比例制御信号を受信して、この比例制御信号を自動的に弁開度に変換し、弁開度に応じて回転角度を調整しながら弁を駆動するモータユニットを用いて、弁の弁開度を制御する空気調和制御装置があった。
また、オン時に弁を開く方向に弁駆動用モータが回転する弁開接点と、オン時に弁を閉じる方向に弁駆動用モータが回転する弁閉接点とを設け、開方向接点又は閉方向接点のいずれかの接点を閉じる信号を出力するか、又は、どちらにも出力しないという所謂３位置制御を行う場合、弁駆動用モータに回転角度に比例して抵抗値が変化する抵抗器を設け、制御装置がこの抵抗器の抵抗値を読み取って、弁開度に変換し、現状の弁開度をフィードバックしながら、弁を操作するものもあった。
【０００３】
ここで、弁開度の制御にあまり高い精度が要求されていない場合、弁駆動用モータが弁を全閉状態から全開状態まで（全開状態から全閉状態まで）駆動するのに要する時間（所謂、弁トラベルタイム）を予め設定しておき、弁開接点及び弁閉接点のオン時間をそれぞれ合計して、この合計時間と弁トラベルタイムとから現在の弁開度（弁開度論理値）を演算で求め、弁開度を制御する方法もあった。この時、弁開度論理値と実際の弁開度との誤差が拡大するのを防止するために、弁閉接点を一定時間閉じて弁を全閉状態にし、弁開度論理値と実際の弁開度とを共に０％として一致させる全閉キャリブレーションを定期的に行うか、又は、弁開接点を一定時間閉じて弁を全開状態にし、弁開度論値値と実際の弁開度とを共に１００％として一致させる全開キャリブレーションを定期的に行い、弁開度論理値を補正していた。
【０００４】
この空気調和制御装置の概略構成図を図１０に示す。７は冷水と空気との間で熱交換を行う熱交換手段（図示せず）に冷水を供給する冷水弁、９は温度検出器６の検出信号を制御対象（空気）の温度に変換する温度検出手段、１１は中央演算処理部たるＣＰＵ、１２は制御目標温度や制御演算用パラメータを記憶するデータメモリ、２１ａはオン時に冷水弁７を開く方向に弁駆動用モータ７ａが回転する弁開接点、１０ａはＣＰＵ１１から入力される信号に応じて弁開接点２１ａをオンする駆動信号を発生する弁開接点出力手段、２１ｂはオン時に冷水弁７を閉じる方向に弁駆動用モータ７ａが回転する弁閉接点、１０ｂはＣＰＵ１１から入力される信号に応じて弁閉接点２１ｂをオンする駆動信号を発生する弁閉接点出力手段である。尚、図１０中の２０は弁駆動用モータ７ａの電源であり、弁駆動用モータ７ａと、電源２０と、弁開接点２１ａと、弁閉接点２１ｂとから冷水弁駆動部２２ａが構成される。
【０００５】
ＣＰＵ１１は、温度検出手段９から入力された空気の温度と、データメモリ１２に予め格納された制御目標温度及び制御演算用パラメータとに基づいて、制御演算（一般的には、デジタルＰＩＤ演算）を実行し、冷水弁７の弁開度目標値を決定する。この時、ＣＰＵ１１は弁開接点２１ａ及び弁閉接点２１ｂのオン時間を合計し、この合計時間を弁トラベルタイムで除して、演算により弁開度論理値を求める。そして、ＣＰＵ１１は、弁開度論理値と弁開度目標値との差から弁開接点２１ａ又は弁閉接点２１ｂをオンする駆動時間を求め、この駆動時間の間だけ弁開接点出力手段１０ａ又は弁閉接点出力手段１０ｂから駆動信号を発生させ、弁開接点２１ａ又は弁閉接点２１ｂをオンして、弁駆動用モータ７ａを駆動し冷水弁７の弁開度を調節する。
【０００６】
この空気調和制御装置は冷水弁７の弁開度を検出する手段を備えていないので、温度調整動作開始時は冷水弁７の弁開度が不明である。そこで、温度調整動作開始時に弁トラベルタイムよりも長い時間、ＣＰＵ１１は例えば弁閉接点出力手段１０ｂから駆動信号を出力させて、弁閉接点２１ｂをオンする。この時、弁駆動用モータ７ａは弁トラベルタイムよりも長い時間冷水弁７を閉じる方向に駆動されるので、温度調整動作開始時に冷水弁７の弁開度がどのような状態であっても、冷水弁７の弁開度を０％にセットすることができる。而して、ＣＰＵ１１は弁開度論理値と実際の弁開度を共に０％に一致させた状態から、温度調整動作を開始することができる。
【０００７】
ところで、ＣＰＵ１１は、演算で得られた弁開度目標値を０〜１００％の範囲内に制限するリミット処理を行った後、この弁開度目標値と弁開度論理値に応じて、弁駆動用モータ７を駆動するための駆動信号を弁開接点出力手段１０ａ又は弁閉接点出力手段１０ｂから出力させる。ここで、弁トラベルタイムを例えば６０秒とし、弁開度目標値を５０％、弁開度論理値を０％とすると、ＣＰＵ１１は、冷水弁７を５０％開くのに要する時間（３０秒）だけ弁開接点駆動手段１０ａから駆動信号を出力すればよい。
【０００８】
ところで、ＣＰＵ１１の演算サイクルは、通常、弁トラベルタイムに比べて短いため、弁開接点２１ａのオン時間を演算サイクル毎に積算し、その結果を弁トラベルタイムで除算することによって、弁開度目標値の変化として認識し、逐次演算によって得られる弁開度目標値と常時比較することによって、弁開接点２１ａ又は弁閉接点２１ｂの駆動時間を更新する。また、演算で得られた弁開度目標値が弁開度論理値を下回っている場合、ＣＰＵ１１は、弁閉接点出力手段１０ｂから弁閉接点２１ｂに駆動信号を出力させて弁閉接点２１ｂをオンし、冷水弁７を閉じる方向に弁駆動用モータ７ａを回転させて、冷水弁７の弁開度を小さくするが、弁閉接点２１ｂのオン時間は、弁開接点２１ａのオン時間とは逆の値、すなわち負の値として積算し、弁開度論理値を演算する。
【０００９】
ここで、弁トラベルタイムをＴｖ（秒）、ＣＰＵ１１の演算サイクルをＴｃ（秒）、弁開接点出力手段１０ａが弁開接点２１ａをオンする駆動信号を出力した回数をＮｏ（回）、弁閉接点出力手段１０ｂが弁閉接点２１ｂをオンする駆動信号を出力した回数をＮｃ（回）とすると、弁開度論理値Ｖｏ（％）は式（１）によって求められる。但し、０≦Ｖｏ≦１００とする。
【００１０】
Ｖｏ＝１００×Ｔｃ×（Ｎｏ−Ｎｃ〕／Ｔｖ ……（１）
このように、ＣＰＵ１１は、弁開接点２１ａ又は弁閉接点２１ｂをそれぞれオンした時間の合計時間と弁トラベルタイムＴｖとから、冷水弁７の弁開度論理値Ｖｏを求めているが、弁トラベルタイムＴｖ自体があまり正確な値ではないので、弁駆動用モータ７ａが回転、停止を繰り返して、冷水弁７の開閉動作を行う間に、実際の弁開度と、弁開度論理値との間に誤差が発生していた。
【００１１】
しかし、この空気調和制御装置では、ＣＰＵ１１が制御目標温度と温度検出手段９の検出した現状温度との差に基づいて弁開度目標値を演算しているので、弁開度論理値と実際の弁開度との間に誤差が発生したとしても、この誤差による影響が現状温度に現れ、その結果、誤差による影響が弁開度目標値に反映されるので、弁開度論理値の誤差は実質的にはキャンセルされる。
【００１２】
ところで、ＣＰＵ１１の演算で得られた弁開度目標値の範囲は０〜１００％であり、弁開度論理値の範囲も０〜１００％である。図１１（ａ）に示すように、弁開度論理値ＶＯが実際の弁開度ＶＢよりも大きい側にずれた場合、弁開度目標値が例えば１００％になると、ＣＰＵ１１は弁開接点出力手段１０ａから弁開接点２１ａに駆動信号を出力させて弁開接点２１ａをオンし、冷水弁７を開く方向に弁駆動用モータ７ａを回転させる。弁駆動用モータ７ａの回転に応じて冷水弁７が開くにつれて弁開度論理値ＶＯが除々に増加し、弁開度論理値ＶＯが１００％となった時点で、弁開接点駆動手段１０ａが駆動信号の出力を停止し、弁開接点２１ａがオフして、弁駆動用モータ７ａが停止する。ここで、弁開度論理値ＶＯは実際の弁開度ＶＢよりも大きい側にずれているので、実際の弁開度ＶＢが１００％より小さいにもかかわらず、ＣＰＵ１１は駆動信号の出力を停止し、冷水弁７を１００％開くことができなかった。この時、温度検出手段９の検出した現状温度が制御目標温度からずれて、冷水弁７の弁開度をさらに大きくする必要があったとしても、弁開度論理値が１００％になっているために、実際の弁開度が１００％より小さいにもかかわらず、ＣＰＵ１１は冷水弁７をそれ以上開くことができず、現状温度を制御目標温度に追従させることができないという問題があった。
【００１３】
これとは逆に、図１１（ｂ）に示すように、弁開度論理値ＶＯが実際の弁開度ＶＢより小さい側にずれた場合にも同様の不具合が発生する。すなわち、弁開度目標値が例えば０％になると、ＣＰＵ１１は弁閉接点出力手段１０ｂから弁閉接点２１ｂに駆動信号を出力させて弁閉接点２１ｂをオンし、冷水弁７を閉じる方向に弁駆動用モータ７ａを回転させる。ここで、弁駆動用モータ７ａの回転に応じて冷水弁７が閉じるにつれて、弁開度論理値ＶＯが除々に低下し、弁開度論理値ＶＯが０％となった時点で、弁閉接点駆動手段１０ｂは駆動信号の出力を停止し、弁閉接点２１ｂがオフして、弁駆動用モータ７ａが停止する。ここで、弁開度論理値ＶＯは実際の弁開度ＶＢよりも小さい側にずれているために、実際の弁開度ＶＢが０％より大きいにもかかわらず、ＣＰＵ１１は冷水弁７をそれ以上閉じることができず、上述と同様に、現状温度を制御目標温度に追従させることができないという問題があった。
【００１４】
このような不具合を防止するために、ＣＰＵ１１は、弁開度目標値と無関係に、冷水弁７を閉じるための駆動信号を、弁閉接点駆動手段１０ｂから弁閉接点２１ｂへ定期的に出力させ、弁開度論理値ＶＯが０％になっても、さらに一定時間駆動信号を出力しつづけることによって、冷水弁７を全閉状態として、実際の弁開度ＶＢと弁開度論理値ＶＯとを共に０％とする補正（所謂、弁全閉キャリブレーション）を行い、その後、ＣＰＵ１１は通常の温度調整動作に復帰し、弁開度目標値に応じて冷水弁７の弁開度を調整していた。同様にＣＰＵ１１は、弁開度目標値と無関係に、冷水弁７を開くための駆動信号を、弁開接点駆動手段１０ａから弁開接点２１ａへ定期的に出力させ、弁開度論理値ＶＯが１００％になっても、さらに一定時間駆動信号を出力しつづけることによって、冷水弁７を全開状態として、実際の弁開度ＶＢと弁開度論理値ＶＯとを共に１００％とする補正（所謂、弁全開キャリブレーション）を行うことによっても、実際の弁開度と弁開度論理値とを一致させることができた。
【００１５】
【発明が解決しようとする課題】
上述した前者の空気調和制御装置では、自ら回転角度を調整しながら弁を駆動するモータユニットを用いたり、モータの回転角度に比例して抵抗値が変化する抵抗器を弁駆動用モータに設けているので、装置のコストが高くなるという問題があった。
【００１６】
また、後者の空気調和制御装置では、ＣＰＵ１１の制御状態と無関係に、定期的に弁全閉キャリブレーション又は弁全開キャリブレーションを行っているので、キャリブレーションを行う間、弁６が全閉状態又は全開状態となり、温度調節のための能力が全く不足したり、逆に過大になったりするため、制御対象の温度が制御目標温度から大きくずれてしまうという問題があった。
【００１７】
本発明は、上記問題点に鑑みて為されたものであり、その目的とするところは、コストアップとなることなく、弁開度論理値と実際の弁開度との誤差を小さくし、且つ、温度調整動作に与える影響を小さくした空気調和制御装置を提供することにある。
【００１８】
【課題を解決するための手段】
上記目的を達成するために、請求項１の発明では、冷水又は温水と空気との間で熱交換を行う熱交換手段に、冷水又は温水を供給する弁の弁開度を調節して、空気の温度を制御する空気調和制御装置であって、弁を開閉する弁駆動用モータを駆動するための駆動信号を発生する駆動信号発生手段と、空気の温度を検出する温度検出手段と、弁駆動用モータが弁を全開状態から全閉状態まで駆動するのに要する弁トラベルタイムや制御目標温度や制御演算に必要なパラメータを記憶するデータメモリと、駆動信号発生手段が駆動信号を発生した時間の合計と弁トラベルタイムとから現在の弁開度を演算し、温度検出手段の検出した温度及び制御目標温度から弁の弁開度目標値を演算するとともに、演算で求めた現在の弁開度と弁開度目標値との差及び弁トラベルタイムから駆動信号を発生する駆動時間を演算し、前記駆動時間だけ駆動信号発生手段から駆動信号を発生させる中央演算処理部とを備え、弁開度目標値が略０％又は略１００％になった場合、中央演算処理部は、前記駆動時間に予め設定された一定時間を加算した時間だけ駆動信号発生手段から駆動信号を発生させて、実際の弁開度を略０％又は略１００％とするとともに、演算で求めた現在の弁開度を略０％又は略１００％に設定して、実際の弁開度と演算で求めた弁開度とを一致させるキャリブレーション動作を行うことを特徴とする。したがって、弁開度目標値ＶＣが０％又は１００％になった時だけ、キャリブレーション動作が行われるので、キャリブレーション動作による温度調整動作への影響を小さくすることができる。
【００１９】
請求項２の発明では、請求項１の発明において、弁開度目標値が略０％となって中央演算処理部がキャリブレーション動作を行う間に、弁開度目標値が略０％から変化した場合、中央演算処理部は演算で求めた弁開度を略０％に設定して、通常の温度調整動作に復帰するとともに、弁開度目標値が略１００％となって中央演算処理部がキャリブレーション動作を行う間に、弁開度目標値が略１００％から変化した場合、中央演算処理部は演算で求めた弁開度を略１００％に設定して、通常の温度調整動作に復帰しているので、キャリブレーション動作中に、弁開度の変化によって制御対象の温度に影響が及び、弁開度目標値が変化すると、即座にキャリブレーション動作を終了しているので、キャリブレーション動作による温度調整動作への影響をさらに小さくすることができる。
【００２０】
請求項３の発明では、冷水又は温水と空気との間で熱交換を行う熱交換手段に、冷水又は温水を供給する弁の弁開度を調節して、空気の温度を制御する空気調和制御装置であって、弁を開閉する弁駆動用モータを駆動するための駆動信号を発生する駆動信号発生手段と、空気の温度を検出する温度検出手段と、弁駆動用モータが弁を全開状態から全閉状態まで駆動するのに要する弁トラベルタイムや制御目標温度や制御演算に必要なパラメータを記憶するデータメモリと、駆動信号発生手段が駆動信号を発生した時間の合計と弁トラベルタイムとから現在の弁開度を演算し、温度検出手段の検出した温度及び制御目標温度から弁の弁開度目標値を演算するとともに、演算で求めた現在の弁開度と弁開度目標値との差及び弁トラベルタイムから駆動信号を発生する駆動時間を演算し、前記駆動時間だけ駆動信号発生手段から駆動信号を発生させる中央演算処理部とを備え、中央演算処理部が弁開度目標値の下限値を０％よりも小さい値に設定するとともに、弁開度目標値の上限値を１００％よりも大きい値に設定し、弁開度目標値が下限値に等しくなった場合、中央演算処理部は弁を閉じる方向の駆動信号を駆動信号発生手段から発生させ、弁開度目標値が上限値に等しくなった場合、中央演算処理部は弁を開く方向の駆動信号を駆動信号発生手段から発生させて、実際の弁開度と演算で求めた弁開度とを一致させるキャリブレーション動作を行うことを特徴とする。したがって、弁開度目標値の範囲を下限値又は上限値に拡張することにより、弁開度論理値と実際の弁開度との誤差が拡張された範囲内に収まっている間は、弁のキャリブレーション動作は行われないので、キャリブレーション動作による温度調整動作への影響を小さくすることができる。また、弁開度論理値と実際の弁開度との誤差が拡張された範囲以上に拡大した場合は、弁のキャリブレーション動作が行われるので、誤差を補正して制御精度を向上させることができる。
【００２１】
請求項４の発明では、請求項３の発明において、弁開度目標値が略１００％を越える場合、中央演算処理部は弁を開く方向の駆動信号のみを駆動信号発生手段から発生させ、弁開度目標値が略０％を下回っている場合、中央演算処理部は弁を閉じる方向の駆動信号のみを駆動信号発生手段から発生させているので、弁開度論理値と実際の弁開度との誤差が拡張された範囲内に収まっていても、弁開度目標値が一旦拡張された範囲内に入り、その後０〜１００％の範囲内に戻れば、その過程で弁開度論理値の誤差を補正することができる。
【００２２】
請求項５の発明では、請求項１乃至４の発明において、温度調整動作開始時に、中央演算処理部は弁を全閉又は全開させる駆動信号を駆動信号発生手段から発生させ、演算で求めた弁開度を略０％又は略１００％に設定するキャリブレーション動作を行っているので、弁開度論理値と実際の弁開度とを一致させた状態で温度調整動作を開始することができる。
【００２３】
請求項６の発明では、請求項１乃至５の発明において、温度調整動作終了時に、中央演算処理部は弁を全閉又は全開させる駆動信号を駆動信号発生手段から発生させ、演算で求めた弁開度を略０％又は略１００％に設定するキャリブレーション動作を行っているので、次回温度調整動作開始時にキャリブレーション動作を行う必要がなく、即座に温度調整動作を開始できる。
【００２４】
【発明の実施の形態】
本願発明の実施の形態を図面を参照して説明する。
（実施形態１）
本実施形態の空気調和制御装置を用いるシステムの概略構成図を図１に示す。
１は、外気を取り入れる外気取り入れ口であり、外部（ＯＡ）から空気取り入れ口１を介して取り込まれた外気は、外気ダンパー１４を介して空調機Ｂに取り込まれる。
【００２５】
空調機Ｂは、外気ダンパー１４を介して取り込まれた外気と冷水又は温水との間で夫々熱交換を行い外気を冷却又は加熱する熱交換手段たる冷水コイル２、温水コイル３と、冷水コイル２又は温水コイル３により冷却又は加熱された外気を加圧して吹き出し口５から室内（ＳＡ）に供給する送風機４から構成される。
１３は、送風機４を駆動するための送風機動力盤であり、送風機動力盤１３には、送風機４を起動又は停止させる制御信号が後述する空気調和制御装置ＤＤＣから入力される入力接点１３ａと、送風機４の運転状態を示す信号を空気調和制御装置ＤＤＣに出力するための出力接点１３ｂとが設けられている。ここに、送風機４が停止している場合、外気ダンパー１４は、空気調和制御装置ＤＤＣから入力された制御信号に応じて、空気取り入れ口１から空調機Ｂへの通風経路１５を遮断し、室内に不要な外気が侵入するのを防止している。また、６は、送風機４の送風口と吹き出し口５との間の送風路に設けられた温度検出器であり、送風機４の出口温度を検出し、検出信号を空気調和制御装置ＤＤＣに出力している。尚、本実施形態では温度検出器６が送風機４の出口温度を検出しているが、室内の温度を検出するようにしても良い。
【００２６】
１６は、冷水コイル２に冷水を循環させる冷水配管であり、冷水配管１６には冷水コイル２に供給する冷水の量を調節するための冷水弁７が設けられている。また、１７は、温水コイル３に温水を循環させる温水配管であり、温水配管１７には温水コイル３に供給する温水の量を調節するための温水弁８が設けられている。冷水弁７及び温水弁８には、それぞれ、各弁を開閉するための冷水弁駆動部２２ａ、温水弁駆動部２２ｂが設けられている。各弁駆動部２２ａ，２２ｂは、従来例で説明した図１０に示す冷水弁駆動部２２と同様の構成を有しているので、その説明は省略する。
【００２７】
空気調和制御装置ＤＤＣは、制御目標温度や制御演算用のパラメータが格納されたデータメモリ１２と、温度検出器６から入力された検出信号を空調機Ｂの出口温度に変換する温度検出手段たるＡ／Ｄ入力部（ＡＩ）９と、データメモリ１２に格納された制御目標温度及び制御演算用のパラメータや、Ａ／Ｄ入力部９から入力される空調機Ｂの出口温度に基づいて弁開度目標値を演算する中央演算処理部たるＣＰＵ１１と、送風機動力盤１３や外気ダンパー１４に制御信号を出力するとともに、ＣＰＵ１１の演算で得られた各弁７，８の現在の弁開度（以下、弁開度論理値という）と弁開度目標値との差に応じて、各弁駆動用モータ７ａ，８ａを駆動する駆動信号を各弁駆動部２２ａ，２２ｂに出力する駆動信号発生手段たるデジタル出力部（ＤＯ）１０と、送風機制御盤１３から送風機４の運転状態を示す信号が入力されるデジタル入力部（ＤＩ）１９とを備えている。
【００２８】
この空気調和制御装置ＤＤＣの動作を、冷水弁７を例とし、図２に示すフローチャートを参照して説明する。尚、温水弁８についての動作は、冷水弁７についての動作と同様であるので、その説明を省略する。
温度調整動作開始時、空気調和制御装置ＤＤＣはデータメモリ１２から弁トラベルタイムや制御演算に必要なパラメータを読み込む（ステップＳ1 ）。
【００２９】
ところで、この空気調和制御装置ＤＤＣは冷水弁７の現在の弁開度を検出する手段を備えていないので、温度調整動作開始時に冷水弁７の実際の弁開度と弁開度論理値とを一致させる必要がある。そこで、ステップＳ2 において、ＣＰＵ１１は、冷水弁駆動部２２ａが冷水弁７を全開から全閉まで駆動するのに要する時間（弁トラベルタイム）だけ、冷水弁７を閉じる方向に冷水弁駆動部２２ａを動作させるための駆動信号をデジタル出力部１０から冷水弁駆動部２２ａに出力させる。そして、温度調整動作開始時から弁トラベルタイムが経過し、冷水弁７が全閉状態となった時点で、ＣＰＵ１１は冷水弁７の弁開度論理値を０％に設定し、弁開度論理値と実際の弁開度とを共に０％に一致させる（以下、この動作を弁全閉キャリブレーションという）。弁全閉キャリブレーションが終了すると、ＣＰＵ１１は、ステップＳ3 で温度調整動作を開始し、ステップＳ4 で温度調整動作開始時からの経過時間を計時する経過タイマーを起動させ、ステップＳ5 で温度調整動作を継続する場合はステップＳ6 に移行する。
【００３０】
次に、ＣＰＵ１１は、ステップＳ6 でＡ／Ｄ入力部９から現在の送風機４の出口温度を読み込み、ステップＳ7 でデジタルＰＩＤ演算により弁開度目標値ＶＣを演算し、ステップＳ8 で弁開度論理値ＶＯを演算する。この時、ＣＰＵ１１では、弁開度目標値ＶＣの上限値を１００％、下限値を０％に制限するリミット処理を行っている。また、ＣＰＵ１１は、冷水弁７を開く方向に駆動した時間の合計値から、冷水弁７を閉じる方向に駆動した時間の合計値を差し引きし、弁トラベルタイムに対する割合（％）を求めて、冷水弁７の弁開度論理値ＶＯを求めている。
【００３１】
そして、弁開度目標値ＶＣが０＜ＶＣ＜１００（％）の範囲内であれば（ステップＳ9 ）、ＣＰＵ１１はステップＳ10で弁開度目標値ＶＣと弁開度論理値ＶＯとを比較し、両者が一致していれば、ステップＳ16でデジタル出力部１０から冷水弁駆動部２２ａへの駆動信号の出力を停止し、ステップＳ17へ移行する。一方、ステップＳ10で両者が異なっていれば、ステップＳ11で弁開度目標値ＶＣと弁開度論理値ＶＯとの差から冷水弁駆動部２２ａに駆動信号を出力する駆動時間を演算する。ここで、弁トラベルタイムを１００で除した値が、冷水弁７の弁開度を１％だけ開閉するために、デジタル出力部１０から冷水弁駆動部２２ａに駆動信号を出力する単位駆動時間となるので、ＣＰＵ１１は、弁開度目標値ＶＣと弁開度論理値ＶＯとの差に単位駆動時間をかけて冷水弁駆動部２２ａの駆動時間を演算する。
【００３２】
次に、ＣＰＵ１１は、ステップＳ12で弁開度目標値ＶＣと弁開度論理値ＶＯとの大小を比較し、弁開度目標値ＶＣが弁開度論理値ＶＯよりも大きければ、ステップＳ13で冷水弁７を開く方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａに駆動時間だけ出力させ、弁開度目標値ＶＣが弁開度論理値ＶＯよりも小さければ、ステップＳ14で冷水弁７を閉じる方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａに駆動時間だけ出力させる。そして、ステップＳ15で経過タイマーの経過時間をチェックしてステップＳ5 に戻り、上述の動作を繰り返し実行する。
【００３３】
一方、ステップＳ9 で弁開度目標値ＶＣが１００％になった場合、ステップＳ18で、ＣＰＵ１１は、現在の弁開度論理値ＶＯと弁開度目標値ＶＣ（即ち、１００％）との差から求められる冷水弁駆動部２２ａの駆動時間に、予め設定された一定時間（弁トラベルタイムの約３０％）を加算した時間だけ、冷水弁７を開く方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａへ出力させて冷水弁７を全開にし、実際の弁開度ＶＢを確実に１００％とする。そして、ＣＰＵ１１は弁開度論理値ＶＯを１００％とし、弁開度論理値ＶＯと実際の論理値ＶＢとを共に１００％に一致させる（弁全開キャリブレーション）。その後、ステップＳ17でＣＰＵ１１は経過タイマーをクリアして、ステップＳ5 に戻り、上述の処理を繰り返す。
【００３４】
また、ステップＳ9 で弁開度目標値ＶＣが０％になった場合、ステップＳ19で、ＣＰＵ１１は、現在の弁開度論理値ＶＯと弁開度目標値ＶＣ（即ち、０％）との差から求められる冷水弁駆動部２２ａの駆動時間に、予め設定された一定時間（弁トラベルタイムの約３０％）を加算した時間だけ、冷水弁７を閉じる方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａに出力させて冷水弁７を全閉にし、実際の弁開度ＶＢを確実に０％とする。そして、ＣＰＵ１１は弁開度論理値ＶＯを０％とし、弁開度論理値ＶＯと実際の論理値ＶＢとを共に０％に一致させる（弁全閉キャリブレーション）。その後、ステップＳ20でＣＰＵ１１は経過タイマーをクリアして、ステップＳ5 に戻り、上述の処理を繰り返す。
【００３５】
ところで、ＣＰＵ１１の演算で得られた弁開度目標値ＶＣが、０＜ＶＣ＜１００（％）の範囲内にある場合、ＣＰＵ１１はキャリブレーション動作を行わないので、冷水弁７の実際の弁開度ＶＢと弁開度論理値ＶＯとの間に誤差が発生する。しかしながら、この誤差の影響は制御対象の温度と制御目標温度との間の偏差となって表れるため、ＣＰＵ１１の演算によって、偏差を少なくする方向に弁開度目標値ＶＣが修正されるため、制御精度に関して若干問題はあるものの、温度調整動作自体が不良となることはない。
【００３６】
ここで、図３（ａ）に示すように、弁開度論理値ＶＯが実際の弁開度ＶＢに比べて大きい側にずれている場合、弁開度目標値ＶＣが１００％になると、ＣＰＵ１１は上述のように弁全開キャリブレーションを行うが、ＣＰＵ１１は、弁開度論理値ＶＯを現在値から１００％にするまでの時間〔図３（ａ）中の区間Ｔ1 〕に予め設定された一定時間〔図３（ａ）中の区間Ｔ2 〕を加算した時間だけ、冷水弁７を開く方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａに出力させ、冷水弁駆動部２２ａを用いて冷水弁７を開く方向に駆動しているので、冷水弁７の実際の弁開度ＶＢを確実に１００％とすることができ、弁開度論理値ＶＯと実際の弁開度ＶＢとを共に１００％に一致させることができる。
【００３７】
同様にして、図３（ｂ）に示すように、弁開度論理値ＶＯが実際の弁開度ＶＢに比べて小さい側にずれている場合に、弁開度目標値ＶＣが０％になると、ＣＰＵ１１は上述のように弁全閉キャリブレーションを行うが、ＣＰＵ１１は、弁開度論理値ＶＯを現在値から０％にするまでの時間〔図３（ｂ）中の区間Ｔ3 〕に予め設定された時間〔図３（ｂ）中の区間Ｔ4 〕を加算した時間だけ、デジタル出力部１０から冷水弁駆動部２２ａに冷水弁７を閉じる方向の駆動信号を出力させ、冷水弁駆動部２２ａを用いて冷水弁７を閉じる方向に駆動しているので、冷水弁７の実際の弁開度ＶＢを確実に０％とすることができ、弁開度論理値ＶＯと実際の弁開度ＶＢとを共に０％に一致させることができる。
【００３８】
また、ＣＰＵ１１はステップＳ5 で温度調整動作を終了すると、ステップＳ2 で弁全閉キャリブレーション動作を行う。この時、ＣＰＵ１１は弁開度論理値ＶＯを０％にするまでの時間に一定時間（弁トラベルタイムの約３０％）を加算した時間だけ、デジタル出力部１０から冷水弁駆動部２２ａに冷水弁７を閉じる方向の駆動信号を出力させ、冷水弁駆動部２２ａを用いて冷水弁７を閉じる方向に駆動しているので、冷水弁７の実際の弁開度ＶＢを確実に０％とすることができ、弁開度論理値ＶＯと実際の弁開度ＶＢとを共に０％に一致させることができる。したがって、次回、ＣＰＵ１１が温度調整動作を行う際は、弁開度論理値ＶＯと実際の弁開度ＶＢとが共に０％になっているので、キャリブレーション動作を行うことなく、即座に温度調整動作を行うことができる。
【００３９】
このように、本実施形態では、弁開度目標値ＶＣが０％又は１００％になった場合のみ、ＣＰＵ１１がキャリブレーション動作を行っているので、制御状態とは無関係に一定期間毎にキャリブレーション動作を行う場合に比べて、大きな温度変化が発生することがない。
また、冷水弁駆動部２２ａや温水弁駆動部２２ｂに、自ら回転角度を調整しながら弁を駆動するモータユニットを用いたり、モータの回転角度に比例して抵抗値が変化する抵抗器を弁駆動用モータに設けたりしていないので、装置全体のコストアップとなることがない。
【００４０】
（実施形態２）
実施形態１では、弁開度目標値ＶＣが０％又は１００％になった場合のみ、ＣＰＵ１１がキャリブレーション動作を行っているので、制御状態とは無関係に一定期間毎にキャリブレーション動作を行う場合に比べて、キャリブレーション動作時による温度調整動作への影響を小さくすることができる。
【００４１】
しかしながら、弁開度目標値ＶＣが０＜ＶＣ＜１００（％）の範囲でＣＰＵ１１が長時間にわたって温度調整動作を行うと、弁開度論理値ＶＯと実際の弁開度ＶＢとの誤差が大きくなる。したがって、弁開度目標値ＶＣが０％或いは１００％となった時の弁開度論理値ＶＯと実際の弁開度ＶＢとの誤差が大きくなり、キャリブレーション動作によって弁開度が大きく変化するため、制御対象の温度が大きく変化する虞がある。
【００４２】
例えば、冷水弁７の実際の弁開度ＶＢが７０％、弁開度論理値ＶＯが９８％の時に、弁開度目標値ＶＣが１００％になったとすると、温度調整動作上は弁開度を９８％から１００％まで（実際の弁開度ＶＢを７０％から７２％まで）２％だけ大きくすれば、冷水弁７の弁開度を所望の値に調整して、制御対象の温度を一定に制御することができるはずであるが、弁開度目標値ＶＣが１００％になった場合、ＣＰＵ１１が弁全開キャリブレーションを行い、冷水弁駆動部２２ａをさらに一定時間駆動させて、冷水弁７を全開状態とするので、実際の弁開度ＶＢが７０％から１００％まで変化する。
【００４３】
したがって、この時点における所望の弁開度７２％に対して冷水弁７の弁開度が２８％も大きくなるため、制御対象の温度が大きく変化する。そのため、キャリブレーション動作終了後、ＣＰＵ１１が通常の温度調整動作に復帰すると、ＣＰＵ１１は冷水弁駆動部２２ａを用いて温度の偏差を無くす方向に冷水弁７を駆動して、温度の偏差を修正する。このように、キャリブレーション動作を実行したために、通常の温度調整動作時に比べて、温度の制御精度が悪化するため、特に空調器Ｂの出口温度を制御するというように、応答時間の短い制御系では偏差が容認できない範囲まで拡大することが予想される。
【００４４】
そこで、本実施形態では、ＣＰＵ１１がキャリブレーション動作を行っている間でも、逐次演算によって得られる弁開度目標値ＶＣが０％又は１００％でなくなった場合に、ＣＰＵ１１が即座に弁開度論理値ＶＯを０％又は１００％に設定し、キャリブレーション動作を終了して通常の温度調整動作に復帰する。したがって、上述の例では実際の弁開度ＶＢが大きくなり所望の弁開度７２％を上回ると、制御対象の現状温度が制御目標温度をゆきすぎてしまい、弁開度理論値ＶＣが１００％よりも小さくなるため、その時点でＣＰＵ１１は即座に弁開度論理値ＶＯを１００％とし、キャリブレーション動作を終了して、通常の温度制御動作に復帰するため、キャリブレーション動作の温度変化に与える影響を小さくすることができる。
【００４５】
この空気調和制御装置ＤＤＣの動作を、冷水弁７を例とし、図４のフローチャートを参照して説明する。尚、空気調和制御装置ＤＤＣの構成は、実施形態１と同様であるので、その説明は省略する。また、ステップＳ1 〜Ｓ9 、ステップＳ10〜Ｓ17までの動作は実施形態１と同様であるので、その説明は省略する。
ステップＳ9 で弁開度目標値ＶＣが１００％になると、ＣＰＵ１１は、ステップＳ22でキュリブレーションフラグがオンか否かを判断する。ステップＳ22でキャリブレーションフラグがオンであれば、ＣＰＵ１１はステップＳ5 に戻って上述の処理を繰り返し、弁開度目標値ＶＣを演算して、弁開度目標値ＶＣが０＜ＶＣ＜１００％の範囲内か否かを判断する。ステップＳ22でキャリブレーションフラグがオフであれば、ＣＰＵ１１は、ステップＳ23でキャリブレーションタイマーをチェックし、ステップＳ24でデジタル出力部１０から冷水弁駆動部２２ａに冷水弁７を開く方向の駆動信号を出力させ、冷水弁駆動部２２ａを用いて冷水弁７を開く方向に駆動し、ステップＳ25でキャリブレーションタイマーの設定時間が経過したか否かを判断する。ステップＳ25でキャリブレーションタイマーの設定時間が経過していなければ、ＣＰＵ１１は、ステップＳ5 に戻って上述の処理を繰り返し、弁開度目標値ＶＣを演算して、弁開度目標値ＶＣが０＜ＶＣ＜１００％の範囲内か否かを判断する。ステップＳ25でキャリブレーションタイマーの設定時間が経過していれば、ＣＰＵ１１は、ステップＳ26でキャリブレーションフラグをオンにし、ステップＳ27でデジタル出力部１０から冷水弁駆動部２２ａへの駆動信号の出力を停止し、ステップＳ28でキャリブレーションタイマーをクリアーし、ステップＳ5 に戻る。
【００４６】
したがって、弁全開キャリブレーション動作中に、弁開度目標値ＶＣが１００％のままであれば、ＣＰＵ１１は、キャリブレーションタイマーの経過時間だけ、デジタル出力部１０から冷水弁駆動部２２ａに冷水弁７を開く方向の駆動信号を出力させ、冷水弁７を開く方向に駆動する。一方、弁全開キャリブレーション動作中に、逐次演算によって得られる弁開度目標値ＶＣが０＜ＶＣ＜１００％の範囲内に入ると（ステップＳ9 ）、ＣＰＵ１１は、ステップＳ21でキャリブレーションフラグをオフし、弁開度論理値ＶＯを１００％に設定して、ステップＳ10に移行し、通常の温度制御動作に復帰する。
【００４７】
一方、ステップＳ9 で弁開度目標値ＶＣが０％になると、ＣＰＵ１１は、ステップＳ29でキュリブレーションフラグがオンか否かを判断する。ステップＳ29でキャリブレーションフラグがオンであれば、ＣＰＵ１１はステップＳ5 に戻って上述の処理を繰り返し、弁開度目標値ＶＣを演算して、弁開度目標値ＶＣが０＜ＶＣ＜１００％の範囲内か否かを判断する。ステップＳ29でキャリブレーションフラグがオフであれば、ＣＰＵ１１は、ステップＳ30でキャリブレーションタイマーをチェックし、ステップＳ31でデジタル出力部１０から冷水弁駆動部２２ａに冷水弁７を閉じる方向の駆動信号を出力し、冷水弁駆動部２２ａを用いて冷水弁７を閉じる方向に駆動し、ステップＳ32でキャリブレーションタイマーの設定時間が経過したか否かを判断する。ステップＳ32でキャリブレーションタイマーの設定時間が経過していなければ、ＣＰＵ１１はステップＳ5 に戻って上述の処理を繰り返し、弁開度目標値ＶＣを演算して、弁開度目標値ＶＣが０＜ＶＣ＜１００％の範囲内か否かを判断する。ステップＳ32でキャリブレーションタイマーの設定時間が経過していれば、ＣＰＵ１１は、ステップＳ33でキャリブレーションフラグをオンにし、ステップＳ34でデジタル出力部１０から冷水弁駆動部２２ａへの駆動信号の出力を停止し、ステップＳ35でキャリブレーションタイマーをクリアーし、ステップＳ5 に戻る。
【００４８】
したがって、弁全閉キャリブレーション動作中に、弁開度目標値ＶＣが０％のままであれば、ＣＰＵ１１は、キャリブレーションタイマーの経過時間だけ、デジタル出力部１０から冷水弁駆動部２２ａに冷水弁７を閉じる方向の駆動信号を出力させ、冷水弁７を閉じる方向に駆動する。一方、弁全閉キャリブレーション動作中に、逐次演算によって得られる弁開度目標値ＶＣが０＜ＶＣ＜１００％の範囲内に入ると（ステップＳ9 ）、ＣＰＵ１１は、ステップＳ21でキャリブレーションフラグをオフし、弁開度論理値ＶＯを０％に設定して、ステップＳ10に移行し、通常の温度制御動作に復帰する。
【００４９】
（実施形態３）
本実施形態では、実施形態１の空気調和制御装置において、弁開度目標値ＶＣの下限値を０％よりも小さい値（−Ｘ％）に設定するとともに、弁開度目標値ＶＣの上限値を１００％よりも大きい値（１００＋Ｙ）（％）に設定している。例えば、本実施形態ではＸ＝Ｙ＝２０％として、弁開度目標値ＶＣ及び弁開度論理値ＶＯの範囲を夫々（−２０％）から１２０％にまで拡張し、ＣＰＵ１１がデジタルＰＩＤ演算を行っている。
【００５０】
この空気調和制御装置の動作を、冷水弁７を例として、図５のフローチャートを参照して説明する。尚、空気調和制御装置の構成は実施形態１と同様であるので、その説明を省略する。また、空気調和制御装置の基本的な動作は、図２のフローチャートに示す動作と同様であるので、同一の処理には、同一の符号を付して、その説明を省略し、異なる部分のみ説明を行う。
【００５１】
ＣＰＵ１１は、ステップＳ6 〜Ｓ8 で弁開度目標値ＶＣを演算し、ステップＳ9'で弁開度目標値ＶＣが（−Ｘ）＜ＶＣ＜（１００＋Ｙ）の範囲内にあるか否かを判断する。図６（ａ）（ｂ）に示すように、弁開度目標値ＶＣが（−Ｘ）＜ＶＣ＜（１００＋Ｙ）の範囲内にある場合は、ＣＰＵ１１は実施形態１で説明したステップＳ11〜Ｓ15の演算を行い、ステップＳ5 に戻って上述の処理を繰り返す。
【００５２】
一方、図７（ａ）に示すように、ステップＳ9'で弁開度目標値ＶＣが上限値（１００＋Ｙ）と等しくなった場合、ＣＰＵ１１は、ステップＳ18’で冷水弁７を開く方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａへ出力し、冷水弁駆動部２２ａを用いて冷水弁７を開く方向に駆動させ、キャリブレーション動作を行う〔図７（ａ）の区間Ｔ5 〕。
【００５３】
また、図７（ｂ）に示すように、ステップＳ9'で弁開度目標値ＶＣが下限値（−Ｘ）と等しくなった場合、ＣＰＵ１１は、ステップＳ19’で冷水弁７を閉じる方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａへ出力し、冷水弁駆動部２２ａを用いて冷水弁７を開じる方向に駆動させ、キャリブレーション動作を行う〔図７（ｂ）の区間Ｔ6 〕。
【００５４】
ところで、実際の弁開度ＶＢの範囲は０〜１００％であるので、弁開度目標値ＶＣが１００％を越える範囲では、弁開度論理値ＶＯと実際の弁開度ＶＢとの間に必然的に誤差が発生する。同様に、弁開度目標値ＶＣが０％を下回る範囲では、弁開度論理値ＶＯと実際の弁開度ＶＢとの間に必然的に誤差が発生する。しかしながら、弁開度目標値ＶＣを０〜１００％の範囲に制限したとしても、弁開度論理値ＶＯと実際の弁開度ＶＢとの間にある程度の誤差が発生すると予想されるので、弁開度目標値ＶＣの範囲を拡張したことによって発生する誤差は予め容認して、冷水弁７の開閉操作を行う。また、弁開度目標値ＶＣの範囲の拡張分以上の誤差が発生した場合は、その時点で誤差が弁開度目標値ＶＣの拡張範囲内に収まるように補正される。
【００５５】
このように、予想される弁開度論理値ＶＯと実際の弁開度ＶＢとの誤差の分だけ、弁開度目標値ＶＣと弁開度論理値ＶＯの範囲を０〜１００％より拡張しておけば、弁開度論理値ＶＯと実際の弁開度ＶＢとの誤差が拡張範囲内に収まっている間は、キャリブレーション動作が行われないので、キャリブレーション動作のために制御対象の温度が急激に変化するのを防ぐことができる。また、誤差の補正分が小さくなるので、制御対象の温度に与える影響を抑えることもできる。
【００５６】
（実施形態４）
実施形態３の空気調和制御装置では、弁開度目標値ＶＣが上限値又は下限値となった場合のみ、ＣＰＵ１１がキャリブレーション動作を行っているが、ＣＰＵ１１は、弁開度論理値ＶＯと実際の弁開度ＶＢとの誤差の内、弁開度目標値ＶＣの拡張分（−Ｘ％，Ｙ％）を越える部分のみ補正しているので、拡張分の誤差が残ってしまう。
【００５７】
例えば、弁開度目標値ＶＣ及び弁開度論理値ＶＯの範囲が（−２０）〜１２０％に拡張された場合に、ＣＰＵ１１の演算によって得られた弁開度目標値ＶＣが９８％となり、弁開度論理値ＶＯが９８％となったとする。この時、実際の弁開度ＶＢが８８％であり、弁開度論理値ＶＯと実際の弁開度ＶＢとの間に１０％の誤差があるとする。ここで、次の演算サイクルで得られた弁開度目標値ＶＣが２０％増加して１１８％になったとすると、ＣＰＵ１１は、弁トラベルタイムに基づいて、弁を２０％分開くのに要する時間だけ、弁を開く方向に駆動する駆動信号をデジタル出力部１０から弁駆動部へ出力するが、弁駆動部がこの駆動信号に応じて弁を駆動した後、弁開度目標値ＶＣと弁開度論理値ＶＯは共に１１８％、実際の弁開度ＶＢは１００％となる。その後、弁開度目標値ＶＣが１００％になると、ＣＰＵ１１は、弁を１８％分閉じるのに要する時間だけ、弁を閉じる方向の駆動信号をデジタル出力部１０から弁駆動部に出力させるので、実際の弁開度ＶＢが８２％となり、弁開度論理値ＶＯと実際の弁開度ＶＢとの誤差が１８％に拡大してしまう。
【００５８】
そこで、本実施形態では、実施形態３の空気調和制御装置において、弁開度目標値ＶＣが０％よりも小さく且つ下限値（−Ｘ％）よりも大きい場合は、弁を閉じる方向の駆動信号のみを出力し、弁開度目標値ＶＣが１００％よりも大きく且つ上限値（１００＋Ｙ）％よりも小さい場合は、弁を開く方向の駆動信号のみを出力しており、弁開度目標値ＶＣが０〜１００％の範囲では、通常の温度調整動作を行っている。したがって、図９（ａ）に示すように、弁開度目標値ＶＣが１１８％から１００％に変化しても、ＣＰＵ１１は弁を閉じる方向の駆動信号をデジタル出力部１０から弁駆動部に出力させないため、実際の弁開度ＶＢは１００％のままとなり、実際の弁開度ＶＢ、弁開度目標値ＶＣ、弁開度論理値ＶＯが共に１００％となって、実質的にキャリブレーション動作が行われる。同様に、図９（ｂ）に示すように、弁開度目標値ＶＣが０％よりも小さい値から０％に変化しても、ＣＰＵ１１は弁を開く方向の駆動信号をデジタル出力部１０から弁駆動部に出力させないため、実際の弁開度ＶＢは０％のままとなり、実際の弁開度ＶＢ、弁開度目標値ＶＣ、弁開度論理値ＶＯが共に０％となって、実質的にキャリブレーション動作が行われる。
【００５９】
この空気調和制御装置の動作を、冷水弁７を例として、図８のフローチャートを参照して説明する。尚、空気調和制御装置の構成は実施形態１と同様であるので、その説明を省略する。また、空気調和制御装置の基本的な動作は、図５のフローチャートに示す動作と同様であるので、同一の処理には、同一の符号を付して、その説明を省略し、異なる部分のみ説明を行う。
【００６０】
ＣＰＵ１１の演算によって得られた弁開度目標値ＶＣが（下限値）＜ＶＣ＜（上限値）の範囲内にある場合、ＣＰＵ１１はステップＳ10，Ｓ11の演算を行った後、ステップＳ12で弁開度目標値ＶＣと弁開度論理値ＶＯとの大小関係を比較する。弁開度目標値ＶＣが弁開度論理値ＶＯよりも大きい場合、ＣＰＵ１１は、ステップＳ36で弁開度目標値ＶＣが０％よりも小さいか否かを判断する。その結果、弁開度目標値ＶＣが０％以上の場合、ＣＰＵ１１は、ステップＳ37で冷水弁７を開く方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａへ出力し、冷水弁駆動部２２ａを用いて冷水弁７を開く方向に駆動し、ステップＳ15で経過タイマーをチェックして、ステップＳ5 に戻る。一方、弁開度目標値ＶＣが０％よりも小さい場合、ＣＰＵ１１は、ステップＳ40でデジタル出力部１０から冷水弁駆動部２２ａへの駆動信号の出力を停止し、ステップＳ15で経過タイマーをチェックして、ステップＳ5 に戻る。
【００６１】
また、ステップＳ12で弁開度目標値ＶＣと弁開度論理値ＶＯとの大小関係を比較した結果、弁開度目標値ＶＣが弁開度論理値ＶＯ以下の場合、ＣＰＵ１１は、ステッステップＳ38で弁開度目標値ＶＣが１００％よりも大きいか否かを判断する。その結果、弁開度目標値ＶＣが１００％以下の場合、ＣＰＵ１１は、ステップＳ39で冷水弁７を閉じる方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａへ出力し、冷水弁駆動部２２ａを用いて冷水弁７を閉じる方向に駆動し、ステップＳ15で経過タイマーをチェックして、ステップＳ5 に戻る。一方、弁開度目標値ＶＣが１００％よりも大きい場合、ＣＰＵ１１は、ステップＳ40でデジタル出力部１０から冷水弁駆動部２２ａへの駆動信号の出力を停止し、ステップＳ15で経過タイマーをチェックして、ステップＳ5 に戻る。
【００６２】
このように、弁開度目標値ＶＣが１００％を越えている場合、弁開度目標値ＶＣが弁開度論理値ＶＯより小さくなっても、ＣＰＵ１１は冷水弁７を閉じる方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａに出力させない。同様に、弁開度目標値ＶＣが０％を下回っている場合、弁開度目標値ＶＣが弁開度論理値より大きくなっていても、ＣＰＵ１１は冷水弁７を開く方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａに出力させないので、弁開度目標値ＶＣと弁開度論理値ＶＯとの間に誤差が発生したとしても、弁開度目標値ＶＣが０≦ＶＣ≦１００（％）の範囲内に戻る時点で、両者の誤差を自動的に補正することができる。したがって、補正動作時に弁開度が急激に変化することがなく、制御対象の温度に悪影響を与えることがなく、且つ、弁開度論理値ＶＯと実際の弁開度ＶＢとの誤差を小さくすることができる。また、実施形態３と同様、弁開度目標値ＶＣが下限値（−Ｘ）％となった場合は、冷水弁７を閉じる方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａに出力し、弁開度目標値ＶＣが上限値（１００＋Ｙ）％となった場合は、冷水弁７を開く方向の駆動信号をデジタル出力部１０から冷水弁駆動部２２ａに出力することによって、キャリブレーション動作を行っている。
【００６３】
【発明の効果】
上述のように、請求項１の発明は、冷水又は温水と空気との間で熱交換を行う熱交換手段に、冷水又は温水を供給する弁の弁開度を調節して、空気の温度を制御する空気調和制御装置であって、弁を開閉する弁駆動用モータを駆動するための駆動信号を発生する駆動信号発生手段と、空気の温度を検出する温度検出手段と、弁駆動用モータが弁を全開状態から全閉状態まで駆動するのに要する弁トラベルタイムや制御目標温度や制御演算に必要なパラメータを記憶するデータメモリと、駆動信号発生手段が駆動信号を発生した時間の合計と弁トラベルタイムとから現在の弁開度を演算し、温度検出手段の検出した温度及び制御目標温度から弁の弁開度目標値を演算するとともに、演算で求めた現在の弁開度と弁開度目標値との差及び弁トラベルタイムから駆動信号を発生する駆動時間を演算し、前記駆動時間だけ駆動信号発生手段から駆動信号を発生させる中央演算処理部とを備え、弁開度目標値が略０％又は略１００％になった場合、中央演算処理部は、前記駆動時間に予め設定された一定時間を加算した時間だけ駆動信号発生手段から駆動信号を発生させて、実際の弁開度を略０％又は略１００％とするとともに、演算で求めた現在の弁開度を略０％又は略１００％に設定して、実際の弁開度と演算で求めた弁開度とを一致させるキャリブレーション動作を行うことを特徴とする。したがって、弁開度目標値ＶＣが０％又は１００％になった時だけ、キャリブレーション動作が行われるので、弁開度論理値と実際の弁開度との誤差を小さくするとともに、キャリブレーション動作による温度調整動作への影響を小さくできるという効果がある。また、弁駆動用モータに、自ら回転角度を調整しながら弁を駆動するモータユニットを用いたり、モータの回転角度に比例して抵抗値が変化する抵抗器を弁駆動用モータに設ける必要がないので、装置全体のコストアップを招くことがない。
【００６４】
請求項２の発明は、弁開度目標値が略０％となって中央演算処理部がキャリブレーション動作を行う間に、弁開度目標値が略０％から変化した場合、中央演算処理部は演算で求めた弁開度を略０％に設定して、通常の温度調整動作に復帰するとともに、弁開度目標値が略１００％となって中央演算処理部がキャリブレーション動作を行う間に、弁開度目標値が略１００％から変化した場合、中央演算処理部は演算で求めた弁開度を略１００％に設定して、通常の温度調整動作に復帰しているので、キャリブレーション動作中に、弁開度の変化によって制御対象の温度に影響が及び、弁開度目標値が変化すると、即座にキャリブレーション動作を終了しているので、キャリブレーション動作による温度調整動作への影響をさらに小さくできるという効果がある。
【００６５】
請求項３の発明は、冷水又は温水と空気との間で熱交換を行う熱交換手段に、冷水又は温水を供給する弁の弁開度を調節して、空気の温度を制御する空気調和制御装置であって、弁を開閉する弁駆動用モータを駆動するための駆動信号を発生する駆動信号発生手段と、空気の温度を検出する温度検出手段と、弁駆動用モータが弁を全開状態から全閉状態まで駆動するのに要する弁トラベルタイムや制御目標温度や制御演算に必要なパラメータを記憶するデータメモリと、駆動信号発生手段が駆動信号を発生した時間の合計と弁トラベルタイムとから現在の弁開度を演算し、温度検出手段の検出した温度及び制御目標温度から弁の弁開度目標値を演算するとともに、演算で求めた現在の弁開度と弁開度目標値との差及び弁トラベルタイムから駆動信号を発生する駆動時間を演算し、前記駆動時間だけ駆動信号発生手段から駆動信号を発生させる中央演算処理部とを備え、中央演算処理部が弁開度目標値の下限値を０％よりも小さい値に設定するとともに、弁開度目標値の上限値を１００％よりも大きい値に設定し、弁開度目標値が下限値に等しくなった場合、中央演算処理部は弁を閉じる方向の駆動信号を駆動信号発生手段から発生させ、弁開度目標値が上限値に等しくなった場合、中央演算処理部は弁を開く方向の駆動信号を駆動信号発生手段から発生させて、実際の弁開度と演算で求めた弁開度とを一致させるキャリブレーション動作を行うことを特徴とする。したがって、弁開度目標値の範囲を下限値又は上限値に拡張することにより、弁開度論理値と実際の弁開度との誤差が拡張された範囲内に収まっている間は、弁のキャリブレーション動作は行われないので、キャリブレーション動作による温度調整動作への影響を小さくすることができる。また、弁開度論理値と実際の弁開度との誤差が拡張された範囲以上に拡大した場合は、弁のキャリブレーション動作が行われるので、誤差を小さくして制御精度を向上できるという効果がある。また、弁駆動用モータに、自ら回転角度を調整しながら弁を駆動するモータユニットを用いたり、モータの回転角度に比例して抵抗値が変化する抵抗器を弁駆動用モータに設ける必要がないので、装置全体のコストアップを招くことがない。
【００６６】
請求項４の発明は、弁開度目標値が略１００％を越える場合、中央演算処理部は弁を開く方向の駆動信号のみを駆動信号発生手段から発生させ、弁開度目標値が略０％を下回っている場合、中央演算処理部は弁を閉じる方向の駆動信号のみを駆動信号発生手段から発生させているので、弁開度論理値と実際の弁開度との誤差が拡張された範囲内に収まっていても、弁開度目標値が一旦拡張された範囲内に入り、その後０〜１００％の範囲内に戻れば、その過程で弁開度論理値の誤差を補正でき、温度調整動作に影響を与えることなく、キャリブレーションを行えるという効果がある。
【００６７】
請求項５の発明は、温度調整動作開始時に、中央演算処理部は弁を全閉又は全開させる駆動信号を駆動信号発生手段から発生させ、演算で求めた弁開度を略０％又は略１００％に設定するキャリブレーション動作を行っているので、弁開度論理値と実際の弁開度とを一致させた状態で温度調整動作を開始できるという効果がある。
【００６８】
請求項６の発明は、温度調整動作終了時に、中央演算処理部は弁を全閉又は全開させる駆動信号を駆動信号発生手段から発生させ、演算で求めた弁開度を略０％又は略１００％に設定するキャリブレーション動作を行っているので、次回温度調整動作開始時にキャリブレーション動作を行う必要がなく、即座に温度調整動作を開始できるという効果がある。
【図面の簡単な説明】
【図１】実施形態１の空気調和制御装置を用いるシステムの概略構成図である。
【図２】同上の動作を説明するフローチャートである。
【図３】（ａ）（ｂ）は同上のキャリブレーション動作を説明する図である。
【図４】実施形態２の空気調和制御装置の動作を説明するフローチャートである。
【図５】実施形態３の空気調和制御装置の動作を説明するフローチャートである。
【図６】（ａ）（ｂ）は同上のキャリブレーション動作を説明する図である。
【図７】（ａ）（ｂ）は同上の別のキャリブレーション動作を説明する図である。
【図８】実施形態４の空気調和制御装置の動作を説明するフローチャートである。
【図９】（ａ）（ｂ）は同上のキャリブレーション動作を説明する図である。
【図１０】従来の空気調和制御装置を用いるシステムの概略構成図である。
【図１１】（ａ）（ｂ）は同上のキャリブレーション動作を説明する図である。
【符号の説明】
７ 冷水弁
８ 温水弁
１０ デジタル出力部
１１ ＣＰＵ
２２ａ 冷水弁駆動部
２２ａ 温水弁駆動部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air-conditioning control device that controls the temperature of air by adjusting the valve opening degree of a cold water valve or a hot water valve that supplies cold water or hot water to heat exchange means that performs heat exchange between cold water or hot water and air. It is about.
[0002]
[Prior art]
Conventionally, using a motor unit that receives a continuous proportional control signal, automatically converts this proportional control signal into a valve opening, and drives the valve while adjusting the rotation angle according to the valve opening, There was an air conditioning control device that controls the valve opening degree of the valve.
In addition, a valve opening contact that rotates the valve driving motor in the direction to open the valve when turned on and a valve closing contact that rotates the valve driving motor in the direction that closes the valve when turned on are provided. When performing a so-called three-position control that outputs a signal for closing any contact or neither, a control is provided with a resistor whose resistance changes in proportion to the rotation angle in the valve drive motor. Some devices read the resistance value of this resistor, convert it into a valve opening, and operate the valve while feeding back the current valve opening.
[0003]
Here, when control of the valve opening degree is not required to have high accuracy, the time required for the valve driving motor to drive the valve from the fully closed state to the fully open state (from the fully open state to the fully closed state) (so-called “so-called”) , Valve travel time) is set in advance, the valve open contact and valve close contact ON times are totaled, and the current valve opening (valve opening logical value) is calculated from this total time and the valve travel time. There was also a method of controlling the valve opening by calculating. At this time, in order to prevent the error between the valve opening logical value and the actual valve opening from expanding, the valve closing contact is closed for a certain period of time to fully close the valve, and the valve opening logical value and the actual Regularly perform full-closed calibration that matches the valve opening as 0%, or close the valve-open contact for a certain period of time to fully open the valve, and open the valve opening theoretical value and actual valve opening. The full opening calibration is periodically performed so that the values coincide with each other as 100%, and the valve opening logic value is corrected.
[0004]
FIG. 10 shows a schematic configuration diagram of the air conditioning control apparatus. 7 is a cold water valve that supplies cold water to heat exchange means (not shown) that exchanges heat between cold water and air, and 9 is a temperature that converts the detection signal of the temperature detector 6 into the temperature of the control object (air). Detection means, 11 is a central processing unit CPU, 12 is a data memory for storing a control target temperature and control calculation parameters, 21a is a valve opening contact for rotating the valve drive motor 7a in the direction to open the cold water valve 7 when turned on 10a is a valve opening contact output means for generating a driving signal for turning on the valve opening contact 21a in response to a signal input from the CPU 11, and 21b is a valve for rotating the valve driving motor 7a in a direction to close the cold water valve 7 when turned on. Closed contacts 10b are valve closed contact output means for generating a drive signal for turning on the valve closed contact 21b in response to a signal input from the CPU 11. In FIG. 10, reference numeral 20 denotes a power source for the valve driving motor 7a. The valve driving motor 7a, the power source 20, the valve opening contact 21a, and the valve closing contact 21b constitute a chilled water valve driving portion 22a. .
[0005]
The CPU 11 performs a control calculation (generally, a digital PID calculation) based on the air temperature input from the temperature detection means 9 and the control target temperature and control calculation parameters stored in advance in the data memory 12. This is executed, and the valve opening target value of the cold water valve 7 is determined. At this time, the CPU 11 sums the ON times of the valve opening contact 21a and the valve closing contact 21b, divides this total time by the valve travel time, and obtains the valve opening logical value by calculation. Then, the CPU 11 obtains the driving time for turning on the valve opening contact 21a or the valve closing contact 21b from the difference between the valve opening logical value and the valve opening target value, and only during this driving time, the valve opening contact output means 10a or A drive signal is generated from the valve closing contact output means 10b, the valve opening contact 21a or the valve closing contact 21b is turned on, the valve driving motor 7a is driven, and the valve opening degree of the cold water valve 7 is adjusted.
[0006]
Since this air conditioning control device does not include means for detecting the valve opening degree of the cold water valve 7, the valve opening degree of the cold water valve 7 is unknown at the start of the temperature adjustment operation. Therefore, for a time longer than the valve travel time at the start of the temperature adjustment operation, the CPU 11 outputs a drive signal from, for example, the valve closing contact output means 10b to turn on the valve closing contact 21b. At this time, since the valve driving motor 7a is driven in the direction to close the cold water valve 7 for a time longer than the valve travel time, the valve opening degree of the cold water valve 7 is in any state at the start of the temperature adjustment operation. The valve opening degree of the cold water valve 7 can be set to 0%. Thus, the CPU 11 can start the temperature adjustment operation from a state in which both the valve opening logical value and the actual valve opening coincide with 0%.
[0007]
By the way, the CPU 11 performs a limit process for limiting the valve opening target value obtained by the calculation within a range of 0 to 100%, and then, according to the valve opening target value and the valve opening logical value, A drive signal for driving the drive motor 7 is output from the valve opening contact output means 10a or the valve closing contact output means 10b. Here, assuming that the valve travel time is 60 seconds, the valve opening target value is 50%, and the valve opening logic value is 0%, the CPU 11 takes time (30 seconds) to open the cold water valve 7 by 50%. It is only necessary to output a drive signal from the valve opening contact driving means 10a.
[0008]
By the way, since the calculation cycle of the CPU 11 is usually shorter than the valve travel time, the on time of the valve opening contact 21a is integrated for each calculation cycle, and the result is divided by the valve travel time to obtain the valve opening target. The drive time of the valve opening contact 21a or the valve closing contact 21b is updated by recognizing it as a change in value and constantly comparing it with the target valve opening obtained by sequential calculation. When the valve opening target value obtained by the calculation is lower than the valve opening logical value, the CPU 11 outputs a drive signal from the valve closing contact output means 10b to the valve closing contact 21b to set the valve closing contact 21b. The valve opening motor 7a is rotated in the direction to close the cold water valve 7 to reduce the valve opening of the cold water valve 7, but the on time of the valve closing contact 21b is the on time of the valve opening contact 21a. The valve opening logic value is calculated by integrating as an opposite value, that is, a negative value.
[0009]
Here, the valve travel time is Tv (seconds), the calculation cycle of the CPU 11 is Tc (seconds), the number of times that the valve opening contact output means 10a outputs a drive signal for turning on the valve opening contact 21a is No (times), and the valve is closed. Assuming that the number of times that the contact output means 10b outputs a drive signal for turning on the valve closing contact 21b is Nc (times), the valve opening logical value Vo (%) is obtained by the equation (1). However, 0 ≦ Vo ≦ 100.
[0010]
Vo = 100 × Tc × (No−Nc) / Tv (1)
As described above, the CPU 11 obtains the valve opening logical value Vo of the cold water valve 7 from the total time when the valve opening contact 21a or the valve closing contact 21b is turned on and the valve travel time Tv. Since the time Tv itself is not a very accurate value, while the valve drive motor 7a repeatedly rotates and stops and the chilled water valve 7 is opened and closed, the actual valve opening and the valve opening logical value There was an error in between.
[0011]
However, in this air conditioning control apparatus, since the CPU 11 calculates the valve opening target value based on the difference between the control target temperature and the current temperature detected by the temperature detecting means 9, the valve opening logical value and the actual value are calculated. Even if an error occurs with the valve opening, the effect of this error appears in the current temperature, and as a result, the effect of the error is reflected in the valve opening target value. Virtually cancelled.
[0012]
By the way, the range of the valve opening target value obtained by the calculation of the CPU 11 is 0 to 100%, and the range of the valve opening logical value is also 0 to 100%. As shown in FIG. 11A, when the valve opening logical value VO is shifted to a larger side than the actual valve opening VB, the CPU 11 outputs the valve opening contact output when the valve opening target value becomes 100%, for example. The drive signal is output from the means 10a to the valve opening contact 21a to turn on the valve opening contact 21a, and the valve driving motor 7a is rotated in the direction to open the cold water valve 7. The valve opening logic value VO gradually increases as the chilled water valve 7 opens according to the rotation of the valve driving motor 7a, and when the valve opening logic value VO reaches 100%, the valve opening contact driving means 10a The output of the driving signal is stopped, the valve opening contact 21a is turned off, and the valve driving motor 7a is stopped. Here, since the valve opening logical value VO is shifted to a larger side than the actual valve opening VB, the CPU 11 stops outputting the drive signal even though the actual valve opening VB is smaller than 100%. However, the cold water valve 7 could not be opened 100%. At this time, even if the current temperature detected by the temperature detecting means 9 deviates from the control target temperature and the valve opening of the chilled water valve 7 needs to be further increased, the valve opening logic value is 100%. Therefore, although the actual valve opening is smaller than 100%, the CPU 11 cannot open the cold water valve 7 any more, and there is a problem that the current temperature cannot follow the control target temperature.
[0013]
On the contrary, as shown in FIG. 11B, the same problem occurs when the valve opening logical value VO is shifted to a side smaller than the actual valve opening VB. That is, when the valve opening target value becomes, for example, 0%, the CPU 11 outputs a drive signal from the valve closing contact output means 10b to the valve closing contact 21b, turns on the valve closing contact 21b, and closes the chilled water valve 7. The drive motor 7a is rotated. Here, as the chilled water valve 7 is closed according to the rotation of the valve driving motor 7a, the valve opening logical value VO gradually decreases, and the valve opening logical value VO becomes 0%. The driving means 10b stops outputting the driving signal, the valve closing contact 21b is turned off, and the valve driving motor 7a is stopped. Here, since the valve opening logical value VO is shifted to a side smaller than the actual valve opening VB, the CPU 11 sets the chilled water valve 7 in spite of the fact that the actual valve opening VB is larger than 0%. As described above, there is a problem that the current temperature cannot be made to follow the control target temperature.
[0014]
In order to prevent such a problem, the CPU 11 periodically outputs a drive signal for closing the cold water valve 7 from the valve closing contact driving means 10b to the valve closing contact 21b irrespective of the valve opening target value. Even if the valve opening logical value VO becomes 0%, the continuation of the drive signal for a certain period of time causes the chilled water valve 7 to be fully closed, so that the actual valve opening VB and the valve opening logical value VO Both of them are corrected to 0% (so-called valve fully closed calibration), and then the CPU 11 returns to the normal temperature adjustment operation and adjusts the valve opening of the chilled water valve 7 according to the valve opening target value. It was. Similarly, the CPU 11 periodically outputs a drive signal for opening the chilled water valve 7 from the valve opening contact driving means 10a to the valve opening contact 21a regardless of the valve opening target value, and the valve opening logic value VO is Even when it reaches 100%, by continuing to output the drive signal for a certain time, the chilled water valve 7 is fully opened, and the actual valve opening VB and the valve opening logical value VO are both 100% (so-called correction) Also, the actual valve opening degree and the valve opening logic value could be matched by performing the valve full opening calibration.
[0015]
[Problems to be solved by the invention]
In the former air conditioning control device described above, a motor unit that drives the valve while adjusting the rotation angle itself is used, or a resistor whose resistance value changes in proportion to the rotation angle of the motor is provided in the valve driving motor. Therefore, there is a problem that the cost of the apparatus becomes high.
[0016]
Further, in the latter air conditioning control apparatus, the valve fully closed calibration or the valve fully opened calibration is periodically performed regardless of the control state of the CPU 11, so that during the calibration, the valve 6 is in the fully closed state or There is a problem that the temperature to be controlled is greatly deviated from the control target temperature because the temperature adjustment capability is completely insufficient or excessively increased.
[0017]
The present invention has been made in view of the above problems, and its object is to reduce the error between the valve opening logical value and the actual valve opening without increasing the cost, and Another object of the present invention is to provide an air conditioning control apparatus that reduces the influence on the temperature adjustment operation.
[0018]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, the valve opening degree of a valve for supplying cold water or hot water is adjusted to a heat exchange means for performing heat exchange between cold water or hot water and air, An air conditioning control apparatus for controlling the temperature of the air-conditioning apparatus, a drive signal generating means for generating a drive signal for driving a valve driving motor for opening and closing the valve, a temperature detecting means for detecting the temperature of the air, and a valve drive Data memory that stores the valve travel time required for the motor to drive the valve from the fully open state to the fully closed state, the control target temperature, and parameters required for the control calculation, and the time when the drive signal generating means generates the drive signal. The current valve opening is calculated from the total and the valve travel time, and the valve opening target value of the valve is calculated from the temperature detected by the temperature detecting means and the control target temperature. With the valve opening target value And a central processing unit that calculates a drive time for generating a drive signal from the valve travel time and generates a drive signal from the drive signal generating means for the drive time, and the valve opening target value is approximately 0% or approximately 100. When it becomes%, the central processing unit generates a drive signal from the drive signal generating means for a time obtained by adding a predetermined time to the drive time, and the actual valve opening is set to approximately 0% or approximately The current valve opening obtained by calculation is set to approximately 0% or approximately 100%, and a calibration operation is performed to match the actual valve opening and the valve opening determined by the calculation. It is characterized by that. Accordingly, since the calibration operation is performed only when the valve opening target value VC becomes 0% or 100%, the influence on the temperature adjustment operation by the calibration operation can be reduced.
[0019]
In the invention of claim 2, in the invention of claim 1, the valve opening target value changes from approximately 0% while the valve opening target value is approximately 0% and the central processing unit performs the calibration operation. In this case, the central processing unit sets the valve opening obtained by the calculation to approximately 0% and returns to the normal temperature adjustment operation, and the valve opening target value becomes approximately 100% and the central processing unit When the valve opening target value changes from approximately 100% during the calibration operation, the central processing unit sets the valve opening obtained by the calculation to approximately 100% and performs normal temperature adjustment operation. Since it has been restored, if the temperature of the control target is affected by the change in the valve opening during the calibration operation, and the target value for the valve opening changes, the calibration operation is immediately terminated. To temperature control operation by operation It is possible to further reduce sound.
[0020]
In the invention of claim 3, the air conditioning control for controlling the temperature of the air by adjusting the valve opening degree of the valve for supplying the cold water or the hot water to the heat exchange means for exchanging heat between the cold water or the hot water and the air. A drive signal generating means for generating a drive signal for driving a valve drive motor for opening and closing the valve; a temperature detection means for detecting the temperature of the air; and the valve drive motor from the fully open state. A data memory that stores the valve travel time required for driving to the fully closed state, control target temperature, and parameters necessary for control calculation, the total time when the drive signal generating means generates the drive signal, and the valve travel time The valve opening target value of the valve is calculated from the temperature detected by the temperature detecting means and the control target temperature, and the difference between the current valve opening and the valve opening target value obtained by the calculation is calculated. And valve travel time A central processing unit that calculates a driving time for generating a dynamic signal and generates a driving signal from the driving signal generating means for the driving time, and the central processing unit sets the lower limit of the valve opening target value from 0% If the upper limit value of the valve opening target value is set to a value larger than 100% and the valve opening target value becomes equal to the lower limit value, the central processing unit closes the valve. When the valve opening target value is equal to the upper limit value, the central processing unit generates a drive signal in the direction to open the valve from the drive signal generating means, A calibration operation is performed to match the valve opening and the valve opening obtained by calculation. Therefore, by expanding the range of the valve opening target value to the lower limit value or the upper limit value, while the error between the valve opening logic value and the actual valve opening is within the expanded range, Since the calibration operation is not performed, the influence of the calibration operation on the temperature adjustment operation can be reduced. Also, if the error between the valve opening logic value and the actual valve opening is expanded beyond the expanded range, the valve calibration operation is performed, so the error can be corrected to improve control accuracy. it can.
[0021]
In the invention of claim 4, in the invention of claim 3, when the valve opening target value exceeds approximately 100%, the central processing unit generates only the drive signal in the direction of opening the valve from the drive signal generating means, When the target opening value is less than about 0%, the central processing unit generates only the driving signal in the direction to close the valve from the driving signal generating means. Even if the error is within the expanded range, if the valve opening target value once enters the expanded range and then returns to the range of 0 to 100%, then the valve opening logical value in the process Error can be corrected.
[0022]
According to a fifth aspect of the present invention, in the first to fourth aspects of the invention, at the start of the temperature adjustment operation, the central processing unit generates a drive signal for driving the valve to be fully closed or fully opened from the drive signal generating means, and the valve is obtained by calculation. Since the calibration operation is performed to set the opening to approximately 0% or approximately 100%, the temperature adjustment operation can be started in a state where the logical value of the valve opening and the actual valve opening match.
[0023]
According to a sixth aspect of the present invention, in the first to fifth aspects of the invention, at the end of the temperature adjustment operation, the central processing unit generates a drive signal for fully closing or opening the valve from the drive signal generating means, and calculating the valve Since the calibration operation is performed to set the opening degree to approximately 0% or approximately 100%, it is not necessary to perform the calibration operation at the start of the next temperature adjustment operation, and the temperature adjustment operation can be started immediately.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
The schematic block diagram of the system using the air conditioning control apparatus of this embodiment is shown in FIG.
Reference numeral 1 denotes an outside air intake port for taking in outside air. Outside air taken in from the outside (OA) via the air intake port 1 is taken into the air conditioner B via the outside air damper 14.
[0025]
The air conditioner B includes a cold water coil 2, a hot water coil 3, and a cold water coil 2 that are heat exchange means for performing heat exchange between the outside air taken in via the outside air damper 14 and cold water or hot water to cool or heat the outside air. Or it is comprised from the air blower 4 which pressurizes the external air cooled or heated with the hot water coil 3, and supplies it to the room | chamber interior (SA) from the blower outlet 5.
Reference numeral 13 denotes a blower power panel for driving the blower 4. The blower power panel 13 has an input contact 13 a to which a control signal for starting or stopping the blower 4 is input from an air conditioning control device DDC described later, and a blower 4 is provided with an output contact 13b for outputting a signal indicating the operation state 4 to the air conditioning control device DDC. Here, when the blower 4 is stopped, the outside air damper 14 blocks the ventilation path 15 from the air intake 1 to the air conditioner B according to the control signal input from the air conditioning control device DDC. To prevent unnecessary outside air from entering. Reference numeral 6 denotes a temperature detector provided in the air passage between the air outlet of the blower 4 and the air outlet 5, which detects the outlet temperature of the air blower 4 and outputs a detection signal to the air conditioning controller DDC. ing. In this embodiment, the temperature detector 6 detects the outlet temperature of the blower 4, but it may detect the temperature in the room.
[0026]
A cold water pipe 16 circulates cold water through the cold water coil 2, and the cold water pipe 16 is provided with a cold water valve 7 for adjusting the amount of cold water supplied to the cold water coil 2. Reference numeral 17 denotes a hot water pipe for circulating hot water through the hot water coil 3, and the hot water pipe 17 is provided with a hot water valve 8 for adjusting the amount of hot water supplied to the hot water coil 3. The cold water valve 7 and the hot water valve 8 are respectively provided with a cold water valve drive unit 22a and a hot water valve drive unit 22b for opening and closing each valve. Since each valve drive part 22a, 22b has the structure similar to the cold water valve drive part 22 shown in FIG. 10 demonstrated in the prior art example, the description is abbreviate | omitted.
[0027]
The air conditioning control device DDC includes a data memory 12 in which a control target temperature and control calculation parameters are stored, and a temperature detection means A that converts a detection signal input from the temperature detector 6 into an outlet temperature of the air conditioner B. / D input unit (AI) 9 and valve opening degree based on control target temperature and control calculation parameters stored in data memory 12 and outlet temperature of air conditioner B input from A / D input unit 9 While outputting a control signal to CPU11 which is a central arithmetic processing part which calculates a target value, blower power board 13, and outside air damper 14, the current valve opening (below, hereinafter) of each valve 7 and 8 obtained by calculation of CPU11 Digital which is a drive signal generating means for outputting a drive signal for driving each of the valve drive motors 7a, 8a to each of the valve drive units 22a, 22b according to a difference between the valve opening logical value) and a valve opening target value. Output section And DO) 10, a signal indicating the operating state of the fan 4 from the blower control board 13 and a digital input section (DI) 19 input.
[0028]
The operation of this air conditioning control device DDC will be described with reference to the flowchart shown in FIG. 2, taking the cold water valve 7 as an example. Note that the operation of the hot water valve 8 is the same as the operation of the cold water valve 7, and the description thereof is omitted.
At the start of the temperature adjustment operation, the air conditioning controller DDC reads the valve travel time and parameters necessary for control calculation from the data memory 12 (step S). 1 ).
[0029]
By the way, since this air conditioning control device DDC is not provided with means for detecting the current valve opening degree of the chilled water valve 7, the actual valve opening degree and the valve opening logical value of the chilled water valve 7 are calculated at the start of the temperature adjustment operation. Must match. So step S 2 The CPU 11 operates the chilled water valve drive unit 22a in the direction to close the chilled water valve 7 for the time (valve travel time) required for the chilled water valve drive unit 22a to drive the chilled water valve 7 from fully open to fully closed. A drive signal is output from the digital output unit 10 to the chilled water valve drive unit 22a. When the valve travel time elapses from the start of the temperature adjustment operation and the chilled water valve 7 is fully closed, the CPU 11 sets the valve opening logic value of the chilled water valve 7 to 0%, and the valve opening logic Both the value and the actual valve opening are set to 0% (hereinafter, this operation is referred to as valve full-closed calibration). When the valve fully closed calibration is completed, the CPU 11 executes step S. Three Starts the temperature adjustment operation, and step S Four To start an elapsed timer that measures the elapsed time from the start of the temperature adjustment operation. Five If you want to continue the temperature adjustment operation at step S 6 Migrate to
[0030]
Next, the CPU 11 performs step S. 6 In step S, the current outlet temperature of the blower 4 is read from the A / D input unit 9. 7 In step S, the valve opening target value VC is calculated by digital PID calculation. 8 To calculate the valve opening logic value VO. At this time, the CPU 11 performs limit processing for limiting the upper limit value of the valve opening target value VC to 100% and the lower limit value to 0%. In addition, the CPU 11 subtracts the total time of driving in the direction of closing the cold water valve 7 from the total value of driving in the direction of opening the cold water valve 7 to obtain a ratio (%) with respect to the valve travel time. The valve opening logical value VO of the valve 7 is obtained.
[0031]
If the valve opening target value VC is within the range of 0 <VC <100 (%) (step S 9 ), The CPU 11 performs step S Ten The valve opening target value VC and the valve opening logical value VO are compared with each other. 16 In step S, the output of the drive signal from the digital output unit 10 to the chilled water valve drive unit 22a is stopped. 17 Migrate to On the other hand, step S Ten If they are different, step S 11 Thus, the drive time for outputting the drive signal to the chilled water valve drive unit 22a is calculated from the difference between the valve opening target value VC and the valve opening logical value VO. Here, a value obtained by dividing the valve travel time by 100 is a unit drive time for outputting a drive signal from the digital output unit 10 to the chilled water valve drive unit 22a in order to open and close the valve opening of the chilled water valve 7 by 1%. Therefore, the CPU 11 calculates the driving time of the chilled water valve driving unit 22a by multiplying the difference between the valve opening target value VC and the valve opening logic value VO by unit driving time.
[0032]
Next, the CPU 11 performs step S. 12 The valve opening target value VC is compared with the valve opening logical value VO. If the valve opening target value VC is larger than the valve opening logical value VO, step S 13 If the driving signal in the direction to open the chilled water valve 7 is output from the digital output unit 10 to the chilled water valve driving unit 22a for the driving time, and the valve opening target value VC is smaller than the valve opening logical value VO, step S 14 Then, the driving signal in the direction to close the cold water valve 7 is output from the digital output unit 10 to the cold water valve driving unit 22a for the driving time. And step S 15 Check the elapsed time of the elapsed timer with Step S Five Returning to the above, the above operation is repeatedly executed.
[0033]
On the other hand, step S 9 When the valve opening target value VC reaches 100%, step S 18 Then, the CPU 11 sets a predetermined time (valve for the valve) to the driving time of the chilled water valve driving unit 22a obtained from the difference between the current valve opening logic value VO and the valve opening target value VC (ie, 100%). The driving signal in the direction to open the chilled water valve 7 is output from the digital output unit 10 to the chilled water valve driving unit 22a for the time added by about 30% of the travel time to fully open the chilled water valve 7, and the actual valve opening VB Is 100%. Then, the CPU 11 sets the valve opening logic value VO to 100%, and matches both the valve opening logic value VO and the actual logic value VB to 100% (valve full opening calibration). Then step S 17 The CPU 11 clears the elapsed timer, and step S Five Returning to FIG.
[0034]
Step S 9 When the valve opening target value VC becomes 0%, step S 19 Thus, the CPU 11 sets a predetermined time (valve for the valve) to the driving time of the chilled water valve driving unit 22a obtained from the difference between the current valve opening logic value VO and the valve opening target value VC (ie, 0%). The driving signal in the direction to close the chilled water valve 7 is output from the digital output unit 10 to the chilled water valve driving unit 22a for the time obtained by adding about 30% of the travel time), and the chilled water valve 7 is fully closed. Ensure that VB is 0%. Then, the CPU 11 sets the valve opening logic value VO to 0%, and matches both the valve opening logic value VO and the actual logic value VB to 0% (valve fully closed calibration). Then step S 20 The CPU 11 clears the elapsed timer, and step S Five Returning to FIG.
[0035]
By the way, when the valve opening target value VC obtained by the calculation of the CPU 11 is within the range of 0 <VC <100 (%), the CPU 11 does not perform the calibration operation. An error occurs between the degree VB and the valve opening logic value VO. However, since the influence of this error appears as a deviation between the temperature of the controlled object and the control target temperature, the valve opening target value VC is corrected in a direction to reduce the deviation by the calculation of the CPU 11, so that the control Although there are some problems regarding accuracy, the temperature adjustment operation itself does not become defective.
[0036]
Here, as shown in FIG. 3A, when the valve opening logical value VO is shifted to a larger side than the actual valve opening VB, when the valve opening target value VC becomes 100%, the CPU 11 Performs the valve full open calibration as described above, but the CPU 11 determines the time until the valve opening logical value VO is set to 100% from the current value [section T in FIG. 1 ] For a predetermined time [section T in FIG. 2 ], A driving signal for opening the chilled water valve 7 is output from the digital output unit 10 to the chilled water valve driving unit 22a, and the chilled water valve driving unit 22a is used to drive the chilled water valve 7 in the opening direction. Therefore, the actual valve opening VB of the chilled water valve 7 can be reliably set to 100%, and both the valve opening logical value VO and the actual valve opening VB can be made equal to 100%.
[0037]
Similarly, as shown in FIG. 3B, when the valve opening degree logical value VO is shifted to a smaller side than the actual valve opening degree VB, the valve opening degree target value VC becomes 0%. The CPU 11 performs the valve full-closed calibration as described above, but the CPU 11 determines the time until the valve opening logical value VO is 0% from the current value [section T in FIG. Three ] For a preset time [section T in FIG. Four ] Is output from the digital output unit 10 to the chilled water valve drive unit 22a in the direction to close the chilled water valve 7, and the chilled water valve drive unit 22a is used to drive the chilled water valve 7 in the closing direction. Therefore, the actual valve opening VB of the cold water valve 7 can be surely set to 0%, and both the valve opening logical value VO and the actual valve opening VB can be made equal to 0%.
[0038]
Further, the CPU 11 performs step S. Five When the temperature adjustment operation is finished in step S, 2 Perform the valve fully closed calibration operation with. At this time, the CPU 11 supplies the chilled water valve from the digital output unit 10 to the chilled water valve driving unit 22a for a time obtained by adding a certain time (about 30% of the valve travel time) to the time until the valve opening logical value VO is set to 0%. 7 is output, and the chilled water valve 7 is driven in the closing direction using the chilled water valve drive unit 22a, so that the actual valve opening VB of the chilled water valve 7 is surely set to 0%. Both the valve opening logic value VO and the actual valve opening VB can be made equal to 0%. Therefore, when the CPU 11 performs the temperature adjustment operation next time, the valve opening logical value VO and the actual valve opening VB are both 0%, so that the temperature adjustment is immediately performed without performing the calibration operation. The action can be performed.
[0039]
Thus, in this embodiment, since the CPU 11 performs the calibration operation only when the valve opening target value VC becomes 0% or 100%, the calibration is performed at regular intervals regardless of the control state. Compared with the case where the operation is performed, a large temperature change does not occur.
Also, a motor unit that drives the valve while adjusting the rotation angle itself is used for the cold water valve drive unit 22a or the hot water valve drive unit 22b, or a resistor whose resistance value changes in proportion to the rotation angle of the motor is valve driven. Since it is not provided in the motor for use, the cost of the entire apparatus is not increased.
[0040]
(Embodiment 2)
In the first embodiment, since the CPU 11 performs the calibration operation only when the valve opening target value VC becomes 0% or 100%, the calibration operation is performed at regular intervals regardless of the control state. Compared to the above, the influence on the temperature adjustment operation during the calibration operation can be reduced.
[0041]
However, if the CPU 11 performs the temperature adjustment operation for a long time in the range where the valve opening target value VC is 0 <VC <100 (%), the error between the valve opening logical value VO and the actual valve opening VB is large. Become. Accordingly, an error between the valve opening logical value VO when the valve opening target value VC becomes 0% or 100% and the actual valve opening VB becomes large, and the valve opening greatly changes by the calibration operation. For this reason, there is a possibility that the temperature of the object to be controlled changes greatly.
[0042]
For example, if the actual valve opening VB of the cold water valve 7 is 70% and the valve opening logical value VO is 98%, the valve opening target value VC becomes 100%. Is increased by 2% from 98% to 100% (actual valve opening VB from 70% to 72%), the valve opening of the chilled water valve 7 is adjusted to a desired value, and the temperature of the controlled object is adjusted. Although it should be possible to control the valve opening target value VC to be 100%, the CPU 11 performs the valve full open calibration and drives the chilled water valve drive unit 22a for a further fixed time to 7 is in a fully open state, the actual valve opening VB changes from 70% to 100%.
[0043]
Therefore, the valve opening degree of the chilled water valve 7 is 28% larger than the desired valve opening degree 72% at this time, so that the temperature of the controlled object changes greatly. Therefore, when the CPU 11 returns to the normal temperature adjustment operation after the calibration operation is completed, the CPU 11 drives the chilled water valve 7 in a direction to eliminate the temperature deviation by using the chilled water valve driving unit 22a, and corrects the temperature deviation. . As described above, since the calibration operation is executed, the control accuracy of the temperature is deteriorated as compared with the normal temperature adjustment operation. Therefore, a control system with a short response time, such as controlling the outlet temperature of the air conditioner B in particular. Thus, the deviation is expected to expand to an unacceptable range.
[0044]
Therefore, in the present embodiment, even when the CPU 11 performs the calibration operation, when the valve opening target value VC obtained by the sequential calculation is not 0% or 100%, the CPU 11 immediately determines the valve opening logic. The value VO is set to 0% or 100%, the calibration operation is terminated, and the normal temperature adjustment operation is restored. Therefore, in the above-described example, when the actual valve opening VB increases and exceeds the desired valve opening 72%, the current temperature of the controlled object exceeds the control target temperature, and the valve opening theoretical value VC is 100%. At that time, the CPU 11 immediately sets the valve opening logical value VO to 100%, ends the calibration operation, and returns to the normal temperature control operation. The influence can be reduced.
[0045]
The operation of the air conditioning control device DDC will be described with reference to the flowchart of FIG. 4 using the cold water valve 7 as an example. In addition, since the structure of the air conditioning control apparatus DDC is the same as that of Embodiment 1, the description is abbreviate | omitted. Step S 1 ~ S 9 , Step S Ten ~ S 17 Since the operation up to this point is the same as that of the first embodiment, the description thereof is omitted.
Step S 9 When the valve opening target value VC becomes 100%, the CPU 11 performs step S twenty two To determine whether the calibration flag is on. Step S twenty two If the calibration flag is on, the CPU 11 proceeds to step S. Five Then, the above-described processing is repeated and the valve opening target value VC is calculated to determine whether or not the valve opening target value VC is within the range of 0 <VC <100%. Step S twenty two If the calibration flag is OFF, the CPU 11 proceeds to step S. twenty three Check the calibration timer with Step S twenty four In step S, the digital output unit 10 outputs a driving signal for opening the chilled water valve 7 to the chilled water valve driving unit 22a, and drives the chilled water valve 7 to open using the chilled water valve driving unit 22a. twenty five To determine whether or not the calibration timer set time has elapsed. Step S twenty five If the set time of the calibration timer has not elapsed, the CPU 11 Five Then, the above-described processing is repeated and the valve opening target value VC is calculated to determine whether or not the valve opening target value VC is within the range of 0 <VC <100%. Step S twenty five If the set time of the calibration timer has passed, the CPU 11 proceeds to step S. 26 To turn on the calibration flag and 27 In step S, the output of the drive signal from the digital output unit 10 to the chilled water valve drive unit 22a is stopped. 28 To clear the calibration timer, step S Five Return to.
[0046]
Therefore, if the valve opening target value VC remains 100% during the valve full-open calibration operation, the CPU 11 sends the chilled water valve 7 from the digital output unit 10 to the chilled water valve driving unit 22a for the elapsed time of the calibration timer. Is driven in the direction to open the chilled water valve 7. On the other hand, when the valve opening target value VC obtained by the sequential calculation enters the range of 0 <VC <100% during the valve full open calibration operation (step S). 9 ), The CPU 11 performs step S twenty one To turn off the calibration flag and set the valve opening logic value VO to 100%. Ten To return to normal temperature control operation.
[0047]
On the other hand, step S 9 When the valve opening target value VC becomes 0%, the CPU 11 executes step S 29 To determine whether the calibration flag is on. Step S 29 If the calibration flag is on, the CPU 11 proceeds to step S. Five Then, the above-described processing is repeated and the valve opening target value VC is calculated to determine whether or not the valve opening target value VC is within the range of 0 <VC <100%. Step S 29 If the calibration flag is OFF, the CPU 11 proceeds to step S. 30 Check the calibration timer with Step S 31 In step S, the digital output unit 10 outputs a driving signal for closing the chilled water valve 7 to the chilled water valve driving unit 22a, and drives the chilled water valve 7 using the chilled water valve driving unit 22a. 32 To determine whether or not the calibration timer set time has elapsed. Step S 32 If the calibration timer set time has not elapsed, the CPU 11 proceeds to step S. Five Then, the above-described processing is repeated and the valve opening target value VC is calculated to determine whether or not the valve opening target value VC is within the range of 0 <VC <100%. Step S 32 If the set time of the calibration timer has passed, the CPU 11 proceeds to step S. 33 To turn on the calibration flag and 34 In step S, the output of the drive signal from the digital output unit 10 to the chilled water valve drive unit 22a is stopped. 35 To clear the calibration timer, step S Five Return to.
[0048]
Therefore, if the valve opening target value VC remains 0% during the valve full-closed calibration operation, the CPU 11 sends the chilled water valve from the digital output unit 10 to the chilled water valve driving unit 22a for the elapsed time of the calibration timer. 7 is output in the direction of closing, and the chilled water valve 7 is driven in the direction of closing. On the other hand, when the valve opening target value VC obtained by the sequential calculation enters the range of 0 <VC <100% during the valve full-closed calibration operation (step S). 9 ), The CPU 11 performs step S twenty one To turn off the calibration flag, set the valve opening logic value VO to 0%, step S Ten To return to normal temperature control operation.
[0049]
(Embodiment 3)
In the present embodiment, in the air-conditioning control apparatus of the first embodiment, the lower limit value of the valve opening target value VC is set to a value smaller than 0% (−X%), and the upper limit value of the valve opening target value VC. Is set to a value (100 + Y) (%) larger than 100%. For example, in this embodiment, X = Y = 20%, and the range of the valve opening target value VC and the valve opening logical value VO is expanded from (−20%) to 120%, respectively, and the CPU 11 performs digital PID calculation. Is going.
[0050]
The operation of this air conditioning control apparatus will be described with reference to the flowchart of FIG. In addition, since the structure of an air conditioning control apparatus is the same as that of Embodiment 1, the description is abbreviate | omitted. In addition, since the basic operation of the air conditioning control apparatus is the same as the operation shown in the flowchart of FIG. 2, the same process is denoted by the same reference numeral, the description thereof is omitted, and only different parts are described. I do.
[0051]
CPU11 is step S 6 ~ S 8 To calculate the valve opening target value VC, step S 9 It is then determined whether or not the valve opening target value VC is within the range of (−X) <VC <(100 + Y). As shown in FIGS. 6A and 6B, when the valve opening target value VC is within the range of (−X) <VC <(100 + Y), the CPU 11 performs step S described in the first embodiment. 11 ~ S 15 To calculate step S Five Return to and repeat the above process.
[0052]
On the other hand, as shown in FIG. 9 When the valve opening target value VC becomes equal to the upper limit value (100 + Y), the CPU 11 performs step S 18 A drive signal in the direction of opening the chilled water valve 7 is output from the digital output unit 10 to the chilled water valve drive unit 22a, and the chilled water valve 7 is driven in the direction of opening using the chilled water valve drive unit 22a to perform a calibration operation [ Section T in FIG. Five ].
[0053]
Further, as shown in FIG. 9 When the valve opening target value VC becomes equal to the lower limit value (−X), the CPU 11 determines in step S 19 The driving signal in the direction to close the chilled water valve 7 is output from the digital output unit 10 to the chilled water valve driving unit 22a, and the chilled water valve driving unit 22a is used to drive the chilled water valve 7 in the opening direction to perform the calibration operation. [Section T in FIG. 6 ].
[0054]
By the way, since the range of the actual valve opening VB is 0 to 100%, when the valve opening target value VC exceeds 100%, it is between the valve opening logical value VO and the actual valve opening VB. Inevitably errors occur. Similarly, in the range where the valve opening target value VC is less than 0%, an error inevitably occurs between the valve opening logical value VO and the actual valve opening VB. However, even if the valve opening target value VC is limited to a range of 0 to 100%, a certain degree of error is expected to occur between the valve opening logical value VO and the actual valve opening VB. The error generated by extending the range of the target opening value VC is accepted in advance, and the chilled water valve 7 is opened and closed. Further, when an error greater than or equal to the expansion of the range of the valve opening target value VC occurs, the error is corrected so that it falls within the expanded range of the valve opening target value VC at that time.
[0055]
Thus, the range of the valve opening target value VC and the valve opening logical value VO is expanded from 0 to 100% by the error between the expected valve opening logical value VO and the actual valve opening VB. In this case, the calibration operation is not performed while the error between the valve opening logical value VO and the actual valve opening VB is within the extended range. Can be prevented from changing suddenly. In addition, since the amount of error correction is reduced, the influence on the temperature of the control target can be suppressed.
[0056]
(Embodiment 4)
In the air conditioning control device of the third embodiment, the CPU 11 performs the calibration operation only when the valve opening target value VC becomes the upper limit value or the lower limit value. Since only the portion exceeding the expansion (−X%, Y%) of the valve opening target value VC is corrected among the errors with respect to the valve opening VB, the error for the expansion remains.
[0057]
For example, when the range of the valve opening target value VC and the valve opening logical value VO is expanded to (−20) to 120%, the valve opening target value VC obtained by the calculation of the CPU 11 becomes 98%. It is assumed that the valve opening logical value VO becomes 98%. At this time, it is assumed that the actual valve opening VB is 88%, and there is an error of 10% between the valve opening logical value VO and the actual valve opening VB. Here, if the valve opening target value VC obtained in the next calculation cycle is increased by 20% to 118%, the CPU 11 takes time required to open the valve by 20% based on the valve travel time. However, the driving signal for driving the valve in the opening direction is output from the digital output unit 10 to the valve driving unit. After the valve driving unit drives the valve in accordance with this driving signal, the valve opening target value VC and the valve opening value are opened. The degree logical value VO is 118%, and the actual valve opening VB is 100%. Thereafter, when the valve opening target value VC reaches 100%, the CPU 11 outputs a drive signal in the direction of closing the valve from the digital output unit 10 to the valve drive unit for the time required to close the valve by 18%. The actual valve opening VB becomes 82%, and the error between the valve opening logical value VO and the actual valve opening VB increases to 18%.
[0058]
Therefore, in the present embodiment, in the air-conditioning control apparatus of the third embodiment, when the valve opening target value VC is smaller than 0% and larger than the lower limit (−X%), the drive signal in the direction in which the valve is closed. When the valve opening target value VC is larger than 100% and smaller than the upper limit value (100 + Y)%, only the drive signal for opening the valve is output, and the valve opening target value VC In the range of 0 to 100%, a normal temperature adjustment operation is performed. Therefore, as shown in FIG. 9 (a), even if the valve opening target value VC changes from 118% to 100%, the CPU 11 outputs a drive signal in a direction to close the valve from the digital output unit 10 to the valve drive unit. Therefore, the actual valve opening VB remains at 100%, and the actual valve opening VB, the valve opening target value VC, and the valve opening logical value VO are all 100%. Is done. Similarly, as shown in FIG. 9B, even if the valve opening target value VC changes from a value smaller than 0% to 0%, the CPU 11 sends a drive signal in the direction to open the valve from the digital output unit 10. Since the valve drive unit does not output the actual valve opening VB, the actual valve opening VB remains 0%, and the actual valve opening VB, the valve opening target value VC, and the valve opening logical value VO are all 0%. A calibration operation is performed.
[0059]
The operation of the air conditioning control apparatus will be described with reference to the flowchart of FIG. 8 using the cold water valve 7 as an example. In addition, since the structure of an air conditioning control apparatus is the same as that of Embodiment 1, the description is abbreviate | omitted. Further, since the basic operation of the air conditioning control apparatus is the same as the operation shown in the flowchart of FIG. 5, the same process is denoted by the same reference numeral, the description thereof is omitted, and only different parts are described. I do.
[0060]
When the valve opening target value VC obtained by the calculation of the CPU 11 is within the range of (lower limit value) <VC <(upper limit value), the CPU 11 executes step S Ten , S 11 After performing the calculation of step S 12 Compare the magnitude relationship between the valve opening target value VC and the valve opening logical value VO. When the valve opening target value VC is larger than the valve opening logical value VO, the CPU 11 executes step S 36 It is then determined whether or not the valve opening target value VC is smaller than 0%. As a result, when the valve opening target value VC is 0% or more, the CPU 11 performs step S 37 Then, a drive signal for opening the chilled water valve 7 is output from the digital output unit 10 to the chilled water valve drive unit 22a, and the chilled water valve drive unit 22a is used to drive the chilled water valve 7 in the opening direction. 15 Check the elapsed timer at step S Five Return to. On the other hand, when the valve opening target value VC is smaller than 0%, the CPU 11 performs step S 40 In step S, the output of the drive signal from the digital output unit 10 to the chilled water valve drive unit 22a is stopped. 15 Check the elapsed timer at step S Five Return to.
[0061]
Step S 12 As a result of comparing the magnitude relationship between the valve opening target value VC and the valve opening logical value VO, if the valve opening target value VC is less than or equal to the valve opening logical value VO, the CPU 11 performs step S 38 To determine whether the valve opening target value VC is larger than 100%. As a result, when the valve opening target value VC is 100% or less, the CPU 11 performs step S 39 Then, a driving signal for closing the chilled water valve 7 is output from the digital output unit 10 to the chilled water valve driving unit 22a, and the chilled water valve driving unit 22a is used to drive the chilled water valve 7 in the closing direction. 15 Check the elapsed timer at step S Five Return to. On the other hand, when the valve opening target value VC is larger than 100%, the CPU 11 determines that the step S 40 In step S, the output of the drive signal from the digital output unit 10 to the chilled water valve drive unit 22a is stopped. 15 Check the elapsed timer at step S Five Return to.
[0062]
Thus, when the valve opening target value VC exceeds 100%, even if the valve opening target value VC becomes smaller than the valve opening logical value VO, the CPU 11 gives a drive signal in the direction to close the cold water valve 7. The digital output unit 10 does not output the chilled water valve drive unit 22a. Similarly, when the valve opening target value VC is less than 0%, even if the valve opening target value VC is larger than the valve opening logical value, the CPU 11 digitally outputs a drive signal for opening the chilled water valve 7. Since no output is made from the output unit 10 to the chilled water valve drive unit 22a, even if an error occurs between the valve opening target value VC and the valve opening logical value VO, the valve opening target value VC is 0 ≦ VC ≦ 100. When returning to the range of (%), the error between the two can be automatically corrected. Therefore, the valve opening does not change abruptly during the correction operation, the temperature of the control target is not adversely affected, and the error between the valve opening logical value VO and the actual valve opening VB is reduced. be able to. Similarly to the third embodiment, when the valve opening target value VC becomes the lower limit (−X)%, a driving signal in a direction for closing the chilled water valve 7 is output from the digital output unit 10 to the chilled water valve driving unit 22a. When the valve opening target value VC reaches the upper limit value (100 + Y)%, the calibration operation is performed by outputting a driving signal for opening the chilled water valve 7 from the digital output unit 10 to the chilled water valve driving unit 22a. It is carried out.
[0063]
【The invention's effect】
As described above, the invention of claim 1 adjusts the valve opening degree of a valve for supplying cold water or hot water to the heat exchange means for exchanging heat between cold water or hot water and air, thereby adjusting the temperature of the air. An air conditioning control apparatus for controlling, a drive signal generating means for generating a drive signal for driving a valve driving motor for opening and closing a valve, a temperature detecting means for detecting the temperature of air, and a valve driving motor A data memory for storing the valve travel time required for driving the valve from the fully open state to the fully closed state, the control target temperature, and the parameters necessary for the control calculation, the total time when the drive signal generating means generates the drive signal, and the valve The current valve opening is calculated from the travel time, the valve opening target value of the valve is calculated from the temperature detected by the temperature detection means and the control target temperature, and the current valve opening and valve opening obtained by the calculation are calculated. Difference from target value and valve travel A central processing unit that calculates a driving time for generating a driving signal from the time and generates a driving signal from the driving signal generating means for the driving time, and the valve opening target value becomes approximately 0% or approximately 100%. In this case, the central processing unit generates a drive signal from the drive signal generating means for a time obtained by adding a predetermined time to the drive time, and the actual valve opening is set to approximately 0% or approximately 100%. In addition, the current valve opening obtained by calculation is set to approximately 0% or approximately 100%, and a calibration operation is performed to match the actual valve opening and the valve opening determined by the operation. And Accordingly, since the calibration operation is performed only when the valve opening target value VC becomes 0% or 100%, the error between the valve opening logical value and the actual valve opening is reduced, and the calibration operation is performed. There is an effect that the influence on the temperature adjustment operation due to can be reduced. In addition, it is not necessary to use a motor unit that drives the valve while adjusting the rotation angle by itself, or to provide a resistor whose resistance value changes in proportion to the rotation angle of the motor in the valve drive motor. Therefore, the cost of the entire apparatus is not increased.
[0064]
According to the invention of claim 2, when the valve opening target value changes from approximately 0% while the valve opening target value is approximately 0% and the central processing unit performs the calibration operation, the central processing unit Sets the valve opening obtained by calculation to approximately 0% and returns to the normal temperature adjustment operation, while the valve opening target value is approximately 100% and the central processing unit performs the calibration operation. In addition, when the valve opening target value changes from approximately 100%, the central processing unit sets the valve opening obtained by calculation to approximately 100% and returns to the normal temperature adjustment operation. During the calibration operation, if the valve opening change affects the temperature to be controlled and the valve opening target value changes, the calibration operation is immediately terminated. If the impact can be further reduced There is a cormorant effect.
[0065]
Invention of Claim 3 adjusts the valve opening degree of the valve which supplies cold water or warm water to the heat exchange means which performs heat exchange between cold water or warm water and air, and is the air conditioning control which controls the temperature of air A drive signal generating means for generating a drive signal for driving a valve drive motor for opening and closing the valve; a temperature detection means for detecting the temperature of the air; and the valve drive motor from the fully open state. A data memory that stores the valve travel time required for driving to the fully closed state, control target temperature, and parameters necessary for control calculation, the total time when the drive signal generating means generates the drive signal, and the valve travel time The valve opening target value of the valve is calculated from the temperature detected by the temperature detecting means and the control target temperature, and the difference between the current valve opening and the valve opening target value obtained by the calculation is calculated. And valve travel time A central processing unit that calculates a driving time for generating a signal and generates a driving signal from the driving signal generating means for the driving time, and the central processing unit sets the lower limit value of the valve opening target value to less than 0%. When the upper limit value of the valve opening target value is set to a value larger than 100% and the target value of the valve opening value becomes equal to the lower limit value, the central processing unit in the direction of closing the valve is set. When the drive signal is generated from the drive signal generating means and the valve opening target value becomes equal to the upper limit value, the central processing unit generates the drive signal in the direction to open the valve from the drive signal generating means, and the actual valve A calibration operation is performed to match the opening and the valve opening obtained by calculation. Therefore, by expanding the range of the valve opening target value to the lower limit value or the upper limit value, while the error between the valve opening logic value and the actual valve opening is within the expanded range, Since the calibration operation is not performed, the influence of the calibration operation on the temperature adjustment operation can be reduced. In addition, when the error between the valve opening logic value and the actual valve opening is expanded beyond the expanded range, the valve calibration operation is performed, so that the error can be reduced and the control accuracy can be improved. There is. In addition, it is not necessary to use a motor unit that drives the valve while adjusting the rotation angle by itself, or to provide a resistor whose resistance value changes in proportion to the rotation angle of the motor in the valve drive motor. Therefore, the cost of the entire apparatus is not increased.
[0066]
In the invention of claim 4, when the valve opening target value exceeds approximately 100%, the central processing unit generates only the drive signal in the direction of opening the valve from the drive signal generating means, and the valve opening target value is approximately 0. If the value is less than%, the central processing unit generates only the drive signal in the direction of closing the valve from the drive signal generating means, so the error between the valve opening logic value and the actual valve opening is expanded. Even if it is within the range, if the valve opening target value once enters the expanded range and then returns to the range of 0 to 100%, the error of the valve opening logic value can be corrected in the process, and the temperature There is an effect that calibration can be performed without affecting the adjustment operation.
[0067]
According to a fifth aspect of the present invention, at the start of the temperature adjustment operation, the central processing unit generates a drive signal for fully closing or opening the valve from the drive signal generating means, and the valve opening obtained by the calculation is approximately 0% or approximately 100. Since the calibration operation set to% is performed, there is an effect that the temperature adjustment operation can be started in a state in which the valve opening logical value and the actual valve opening coincide with each other.
[0068]
According to the sixth aspect of the present invention, at the end of the temperature adjustment operation, the central processing unit generates a drive signal for fully closing or opening the valve from the drive signal generating means, and the valve opening obtained by the calculation is approximately 0% or approximately 100. Since the calibration operation set to% is performed, there is no need to perform the calibration operation at the start of the next temperature adjustment operation, and the temperature adjustment operation can be immediately started.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a system using an air-conditioning control apparatus according to a first embodiment.
FIG. 2 is a flowchart illustrating the operation of the above.
FIGS. 3A and 3B are diagrams for explaining the same calibration operation.
FIG. 4 is a flowchart for explaining the operation of the air-conditioning control apparatus according to the second embodiment.
FIG. 5 is a flowchart for explaining the operation of the air-conditioning control apparatus according to the third embodiment.
6A and 6B are diagrams for explaining the calibration operation of the above. FIG.
FIGS. 7A and 7B are diagrams for explaining another calibration operation as described above.
FIG. 8 is a flowchart for explaining the operation of the air-conditioning control apparatus according to the fourth embodiment.
FIGS. 9A and 9B are diagrams for explaining the above-described calibration operation. FIG.
FIG. 10 is a schematic configuration diagram of a system using a conventional air conditioning control apparatus.
FIGS. 11A and 11B are diagrams for explaining the calibration operation of the above.
[Explanation of symbols]
7 Cold water valve
8 Hot water valve
10 Digital output section
11 CPU
22a Cold water valve drive
22a Hot water valve drive unit

Claims (6)

冷水又は温水と空気との間で熱交換を行う熱交換手段に、冷水又は温水を供給する弁の弁開度を調節して、空気の温度を制御する空気調和制御装置であって、弁を開閉する弁駆動用モータを駆動するための駆動信号を発生する駆動信号発生手段と、空気の温度を検出する温度検出手段と、弁駆動用モータが弁を全開状態から全閉状態まで駆動するのに要する弁トラベルタイムや制御目標温度や制御演算に必要なパラメータを記憶するデータメモリと、駆動信号発生手段が駆動信号を発生した時間の合計と弁トラベルタイムとから現在の弁開度を演算し、温度検出手段の検出した温度及び制御目標温度から弁の弁開度目標値を演算するとともに、演算で求めた現在の弁開度と弁開度目標値との差及び弁トラベルタイムから駆動信号を発生する駆動時間を演算し、前記駆動時間だけ駆動信号発生手段から駆動信号を発生させる中央演算処理部とを備え、弁開度目標値が略０％又は略１００％になった場合、中央演算処理部は、前記駆動時間に予め設定された一定時間を加算した時間だけ駆動信号発生手段から駆動信号を発生させて、実際の弁開度を略０％又は略１００％とするとともに、演算で求めた現在の弁開度を略０％又は略１００％に設定して、実際の弁開度と演算で求めた弁開度とを一致させるキャリブレーション動作を行うことを特徴とする空気調和制御装置。An air-conditioning control device that controls the temperature of air by adjusting the valve opening degree of a valve that supplies cold water or hot water to heat exchange means that exchanges heat between cold water or hot water and air. Drive signal generating means for generating a drive signal for driving the valve drive motor that opens and closes, temperature detection means for detecting the temperature of the air, and the valve drive motor drives the valve from the fully open state to the fully closed state. The current valve opening is calculated from a data memory that stores the valve travel time, control target temperature, and parameters required for control calculation, and the total time that the drive signal generator generates the drive signal and the valve travel time. The valve opening target value of the valve is calculated from the temperature detected by the temperature detecting means and the control target temperature, and the drive signal is calculated from the difference between the current valve opening and the valve opening target value obtained by the calculation and the valve travel time. To drive A central processing unit that calculates time and generates a driving signal from the driving signal generating means for the driving time. When the valve opening target value becomes approximately 0% or approximately 100%, the central processing unit The drive signal is generated from the drive signal generating means for a time obtained by adding a predetermined time to the drive time so that the actual valve opening is approximately 0% or approximately 100%, and the current value obtained by calculation The air conditioning control apparatus is characterized in that a calibration operation is performed so that the actual valve opening and the calculated valve opening coincide with each other by setting the valve opening of the valve to approximately 0% or approximately 100%. 弁開度目標値が略０％となって中央演算処理部がキャリブレーション動作を行う間に、弁開度目標値が略０％から変化した場合、中央演算処理部は演算で求めた弁開度を略０％に設定して、通常の温度調整動作に復帰するとともに、弁開度目標値が略１００％となって中央演算処理部がキャリブレーション動作を行う間に、弁開度目標値が略１００％から変化した場合、中央演算処理部は演算で求めた弁開度を略１００％に設定して、通常の温度調整動作に復帰することを特徴とする請求項１の空気調和制御装置。When the valve opening target value changes from approximately 0% while the target valve opening value is approximately 0% and the central processing unit performs the calibration operation, the central processing unit calculates the valve opening obtained by calculation. Set the degree to approximately 0% and return to the normal temperature adjustment operation. While the valve opening target value is approximately 100% and the central processing unit performs the calibration operation, the valve opening target value The air conditioning control according to claim 1, wherein when the air pressure changes from approximately 100%, the central processing unit sets the valve opening obtained by the operation to approximately 100% and returns to the normal temperature adjustment operation. apparatus. 冷水又は温水と空気との間で熱交換を行う熱交換手段に、冷水又は温水を供給する弁の弁開度を調節して、空気の温度を制御する空気調和制御装置であって、弁を開閉する弁駆動用モータを駆動するための駆動信号を発生する駆動信号発生手段と、空気の温度を検出する温度検出手段と、弁駆動用モータが弁を全開状態から全閉状態まで駆動するのに要する弁トラベルタイムや制御目標温度や制御演算に必要なパラメータを記憶するデータメモリと、駆動信号発生手段が駆動信号を発生した時間の合計と弁トラベルタイムとから現在の弁開度を演算し、温度検出手段の検出した温度及び制御目標温度から弁の弁開度目標値を演算するとともに、演算で求めた現在の弁開度と弁開度目標値との差及び弁トラベルタイムから駆動信号を発生する駆動時間を演算し、前記駆動時間だけ駆動信号発生手段から駆動信号を発生させる中央演算処理部とを備え、中央演算処理部が弁開度目標値の下限値を０％よりも小さい値に設定するとともに、弁開度目標値の上限値を１００％よりも大きい値に設定し、弁開度目標値が下限値に等しくなった場合、中央演算処理部は弁を閉じる方向の駆動信号を駆動信号発生手段から発生させ、弁開度目標値が上限値に等しくなった場合、中央演算処理部は弁を開く方向の駆動信号を駆動信号発生手段から発生させて、実際の弁開度と演算で求めた弁開度とを一致させるキャリブレーション動作を行うことを特徴とする空気調和制御装置。An air-conditioning control device that controls the temperature of air by adjusting the valve opening degree of a valve that supplies cold water or hot water to heat exchange means that exchanges heat between cold water or hot water and air. Drive signal generating means for generating a drive signal for driving the valve drive motor that opens and closes, temperature detection means for detecting the temperature of the air, and the valve drive motor drives the valve from the fully open state to the fully closed state. The current valve opening is calculated from a data memory that stores the valve travel time, control target temperature, and parameters required for control calculation, and the total time that the drive signal generator generates the drive signal and the valve travel time. The valve opening target value of the valve is calculated from the temperature detected by the temperature detecting means and the control target temperature, and the drive signal is calculated from the difference between the current valve opening and the valve opening target value obtained by the calculation and the valve travel time. To drive A central processing unit that calculates time and generates a driving signal from the driving signal generation means for the driving time, and the central processing unit sets the lower limit value of the valve opening target value to a value smaller than 0%. At the same time, when the upper limit value of the valve opening target value is set to a value larger than 100% and the valve opening target value becomes equal to the lower limit value, the central processing unit outputs a driving signal in the direction of closing the valve as a driving signal. When the valve opening target value is equal to the upper limit value, the central processing unit generates a drive signal in the direction to open the valve from the drive signal generating means, and calculates the actual valve opening and calculation. An air conditioning control device that performs a calibration operation to match the obtained valve opening. 弁開度目標値が略１００％を越える場合、中央演算処理部は弁を開く方向の駆動信号のみを駆動信号発生手段から発生させ、弁開度目標値が略０％を下回っている場合、中央演算処理部は弁を閉じる方向の駆動信号のみを駆動信号発生手段から発生させることを特徴とする請求項３記載の空気調和制御装置。When the valve opening target value exceeds approximately 100%, the central processing unit generates only the drive signal in the direction of opening the valve from the drive signal generating means, and when the valve opening target value is less than approximately 0%, 4. The air conditioning control apparatus according to claim 3, wherein the central processing unit generates only a driving signal in a direction for closing the valve from the driving signal generating means. 温度調整動作開始時に、中央演算処理部は弁を全閉又は全開させる駆動信号を駆動信号発生手段から発生させ、演算で求めた弁開度を略０％又は略１００％に設定するキャリブレーション動作を行うことを特徴とする請求項１乃至４記載の空気調和制御装置。At the start of the temperature adjustment operation, the central processing unit generates a drive signal from the drive signal generating means for fully closing or opening the valve, and a calibration operation for setting the valve opening obtained by the calculation to approximately 0% or approximately 100%. The air conditioning control device according to any one of claims 1 to 4, wherein 温度調整動作終了時に、中央演算処理部は弁を全閉又は全開させる駆動信号を駆動信号発生手段から発生させ、演算で求めた弁開度を略０％又は略１００％に設定するキャリブレーション動作を行うことを特徴とする請求項１乃至５記載の空気調和制御装置。At the end of the temperature adjustment operation, the central processing unit generates a drive signal from the drive signal generating means for fully closing or opening the valve, and a calibration operation for setting the valve opening obtained by the calculation to approximately 0% or approximately 100%. The air conditioning control device according to claim 1, wherein
JP22994997A 1997-08-26 1997-08-26 Air conditioning control device Expired - Fee Related JP3794118B2 (en)

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JP4817160B2 (en) * 2001-03-07 2011-11-16 日立バルブ株式会社 Air conditioning system and electric operating device
JP2005147458A (en) * 2003-11-13 2005-06-09 Sanki Eng Co Ltd Outside air processing device for air conditioning
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