JPS6118516A - Controller for air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To improve comfortableness by controlling a compressor and the amount of ventilation into the vehicle interior part according to the temperature difference between the upstream and downstream sides of an evaporator and the difference of the thermal load of the car interior part, in the control for air conditioner equipped with the evaporator using coolant. CONSTITUTION:The temperature difference signal between the upstream temperature 13 and the downstream temperature 14 of an evaporator is calculated in a differential amplification circuit 20 and input into an additional amplification circuit 21. The right and left solar radiation amounts 36 and 37 in the vehicle interior are inputted as thermal load into the additional amplification circuit 21, and the temperature difference signal is outputted into a comparison circuit 40. While, the synthetic resistance of an inside-air temperature sensor 32, outside- air temperature sensor 33, and a temperature setting resistance 31 is input into a reversal amplification circuit 35. Said amplification circuit 35 inputs the output which increases with the increase of the thermal load into the comparator 40. Therefore, the comparator 40 controls the coolant discharging faculty of a compressor 50 according to the cooling capacity, and the ventilation amount of blowers 12A and 12B is controlled. With such constitution, comfortableness can be improved.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は冷媒を用いる冷凍サイクルの蒸発器を含む空気
冷却装置を用いた車両空調装置のための制御装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a vehicle air conditioner using an air cooling device including an evaporator of a refrigeration cycle using a refrigerant.

［従来の技術］ この種の空調装置において、断続運転される冷媒圧縮機
により断続的に作用する空気冷却装置を備えるものは既
に知られている。[Prior Art] Among this type of air conditioner, one is already known that includes an air cooling device that is operated intermittently by a refrigerant compressor that is operated intermittently.

公知のものは、蒸発器下流側の冷却空気温度を任意の設
定値と比較して断続信号を得る方式が主流である。この
方式では、設定値を固定または乗員により可変とした場
合、車室熱負荷の変動に対して、車室内空気温度を一定
に維持することが困難であや。このため、設定値を例え
ば車室内空気温度により変化させる方式も提案されてい
る。The most commonly known method is to obtain an intermittent signal by comparing the cooling air temperature downstream of the evaporator with an arbitrary set value. In this method, if the set value is fixed or variable depending on the occupant, it is difficult to maintain a constant cabin air temperature in response to fluctuations in the cabin heat load. For this reason, a method has also been proposed in which the set value is changed depending on, for example, the air temperature inside the vehicle.

［発明が解決しようとする問題点］ しかしながら、この方式では、車室内空気温度の変化速
度が吹出空気温度の変化速度に対して非常に遅いため、
吹出空気温度が大きくハンチングしてフィーリングが悪
くなる問題がある。[Problems to be Solved by the Invention] However, in this method, the rate of change in the vehicle interior air temperature is very slow compared to the rate of change in the temperature of the outlet air.
There is a problem that the temperature of the blown air is large and hunting occurs, resulting in a poor feeling.

Ｅ問題点を解決する手段］ そこで、本発明は上記問題を解決するために、以下のよ
うに構成したことを特徴とする。すなわち、圧縮機とこ
の圧縮機によって圧送される冷媒の蒸発器を含む空気冷
却装置と、前記蒸発器の上流側空気温度に応じた第１の
信号を発生する第１の信号発生手段と、前記蒸発器の下
流側空気温度に応じた第２の信号を発生する第２の信号
発生手段と、前記第１、第２の信号より前記蒸発器の上
、下流の空気温度差に応じる温度差信号を発生する温度
差信号発生手段と、車室の熱負荷に応じた熱負荷信号を
発生する負荷信号発生手段と、前記熱負荷のうちの車室
の第１の部位と第２の部位との熱負荷の差異に相当する
差異信号発生手段と、前記温度差信号発生手段の温度差
信号と前記負荷信号発生手段の前記熱負荷信号との差に
基づいて前記圧縮機の圧縮作動を制御する空気温度制御
手段と、前記負荷信号発生手段の前記熱負荷信号に基づ
き前記差異信号発生手段の差異信号に対応して修整され
た値に相応する送風量を前記蒸発器を介して前記車室の
第１の部位と第２の部位とにそれぞれ供給する空気量調
節手段と、を備えて構成したものである。Means for Solving Problem E] Therefore, in order to solve the above problem, the present invention is characterized by being configured as follows. That is, an air cooling device including a compressor and an evaporator for the refrigerant pumped by the compressor, a first signal generating means for generating a first signal according to the air temperature on the upstream side of the evaporator, a second signal generating means for generating a second signal corresponding to the air temperature downstream of the evaporator; and a temperature difference signal corresponding to the air temperature difference above and downstream of the evaporator based on the first and second signals. temperature difference signal generation means for generating a heat load signal corresponding to the heat load of the vehicle interior; and load signal generation means for generating a heat load signal corresponding to the heat load of the vehicle interior; a difference signal generating means corresponding to a difference in heat load; and air controlling the compression operation of the compressor based on the difference between the temperature difference signal of the temperature difference signal generating means and the heat load signal of the load signal generating means. temperature control means, and a temperature control means for controlling the air flow rate in the vehicle compartment through the evaporator to a value that is adjusted based on the thermal load signal of the load signal generating means and corresponding to the difference signal of the difference signal generating means. The device is configured to include air amount adjusting means for supplying each of the first part and the second part.

［作用］ かかる構成とすることにより、測定された車室熱負荷と
温度差信号発生手段に得られる蒸発器の冷却能力とが対
応するように空気冷却装置の能力が調節され、しかも車
室の第１の部位と第２の部位とに供給する空気量を加減
することで、車室各部の温度差が非所望に変化するのを
防止する。[Function] With this configuration, the capacity of the air cooling device is adjusted so that the measured heat load in the passenger compartment corresponds to the cooling capacity of the evaporator obtained by the temperature difference signal generating means, and moreover, By adjusting the amount of air supplied to the first portion and the second portion, it is possible to prevent the temperature difference between the various portions of the vehicle interior from changing undesirably.

［実施例］ 以下、本発明を添付図面に示す実施例に従って説明する
。第１図は、空気冷却装置を示すもので、主に車室内空
気を循環するように配置された空気ダクト１０内に冷媒
蒸発器１１と送風装置１２Ａ、１２Ｂとが設置されてい
る。蒸発器１１の上流側と下流側にはそれぞれ温度セン
サ１３．１４が設けられ、上流側空気温度、下流側空気
温度に応じた電気信号を発生する。送風装置１２Ａ、１
２Ｂは図外車室の左側部分と右側部分とにそれぞれ蒸発
器１１で冷却された空気を供給する。[Examples] Hereinafter, the present invention will be described according to examples shown in the accompanying drawings. FIG. 1 shows an air cooling system, in which a refrigerant evaporator 11 and blowers 12A, 12B are installed in an air duct 10 arranged to mainly circulate air inside a vehicle. Temperature sensors 13 and 14 are provided on the upstream and downstream sides of the evaporator 11, respectively, and generate electrical signals according to the upstream air temperature and the downstream air temperature. Air blower 12A, 1
2B supplies air cooled by the evaporator 11 to the left side and right side of the vehicle compartment (not shown), respectively.

制御装置を図示する第２図において、温度センサ１３．
１４が発生する電気信号は、電圧信号として差動増幅回
路２０に入力される。差動増幅回路２０は、上流側空気
温度と下流側空気温度との温度差に応じた電圧信号を発
生する。この電圧信号は加算増幅回路２１に入力され、
加算増幅回路２１にはほかに車室に熱負荷として影響す
る左側日射量を示す電圧信号■しと右側日射量を示す電
圧信号ｖＲとが入力される。３６は車室の左側日射量を
検出する光センサ、３７は車室の右側日射量を検出する
光セン号である。抵抗２２．２３．２４は入力電圧に重
みを設定する役目を有する。In FIG. 2 illustrating the control device, temperature sensor 13.
The electrical signal generated by 14 is input to the differential amplifier circuit 20 as a voltage signal. The differential amplifier circuit 20 generates a voltage signal according to the temperature difference between the upstream air temperature and the downstream air temperature. This voltage signal is input to the addition amplifier circuit 21,
In addition, the summing amplifier circuit 21 receives a voltage signal (1) indicating the amount of solar radiation on the left side, which affects the vehicle interior as a heat load, and a voltage signal vR indicating the amount of solar radiation on the right side. 36 is an optical sensor that detects the amount of solar radiation on the left side of the vehicle interior, and 37 is an optical sensor that detects the amount of solar radiation on the right side of the vehicle interior. Resistors 22, 23, 24 have the role of setting weights on the input voltage.

なお、光センサ３６の素子自体は左側よりの約４５°の
入射角度での日射に応じた電流を発生し、直列抵抗との
接続点に前記電圧信号Ｖしを発生する。また光センサ３
７も同様で右側４５°の日射に応じた電流に基づいて前
記電圧信号ＶＲを発生する。Note that the element of the optical sensor 36 itself generates a current corresponding to solar radiation at an incident angle of about 45 degrees from the left side, and generates the voltage signal V at the connection point with the series resistor. Also, optical sensor 3
7 also generates the voltage signal VR based on the current corresponding to the solar radiation at 45 degrees to the right.

所望の目標温度を設定する温度設定抵抗３１、車室内空
気温度を測定する内気温度センサ３２、および車室内空
気温度を測定する外気温度センサ３３は直列に接続され
定電流回路３４から電流が供給される。直列抵抗回路３
１〜３３の合成抵抗値は車室熱負荷に逆比例したものと
なり、その合成抵抗値と比例する端子電圧は、反転増幅
回路３５に入力される。A temperature setting resistor 31 that sets a desired target temperature, an inside air temperature sensor 32 that measures the air temperature inside the vehicle, and an outside air temperature sensor 33 that measures the air temperature inside the vehicle are connected in series and are supplied with current from a constant current circuit 34. Ru. Series resistance circuit 3
The combined resistance value of 1 to 33 is inversely proportional to the cabin heat load, and the terminal voltage proportional to the combined resistance value is input to the inverting amplifier circuit 35.

増幅回路３５の出力は熱負荷の増加につれて増加する。The output of the amplifier circuit 35 increases as the heat load increases.

この出力電圧■は、加算増幅回路２１の出力に現れる温
度差を表わす電圧と、比較回路４０において比較される
。比較回路４０は、熱負荷が冷却能力を上回るときにハ
イレベル出力を生じ、そうでないときにはローレベル出
力を生じる。This output voltage {circle around (2)} is compared with a voltage representing the temperature difference appearing at the output of the summing amplifier circuit 21 in a comparator circuit 40 . Comparison circuit 40 produces a high level output when the heat load exceeds the cooling capacity, and produces a low level output otherwise.

圧縮機５０は、図示しない冷媒配管を介して第１図図示
の蒸発器１１に冷媒を圧送するようになっており、動力
源（例えば補助エンジン）との連結を断続する電磁クラ
ッチ５１を含む。The compressor 50 is configured to forcefully feed refrigerant to the evaporator 11 shown in FIG. 1 via a refrigerant pipe (not shown), and includes an electromagnetic clutch 51 that connects and disconnects a power source (for example, an auxiliary engine).

電磁クラッチ５１は比較回路４０からのハイレベル出力
による駆動回路４１の付勢のもとに駆動リレー４２が付
勢されたとき、圧縮機５０を動力源と連結させる。The electromagnetic clutch 51 connects the compressor 50 to the power source when the drive relay 42 is energized under the energization of the drive circuit 41 by the high level output from the comparator circuit 40 .

送風装置１２Ａ、１２Ｂは、反転増幅回路３５よりの負
荷信号をそれぞれ加算増幅回路６１．６２で増幅した増
幅信号により駆動される各電動モータ６３．６４により
熱負荷に対応した送風能力で駆動される。The air blowers 12A and 12B are driven by electric motors 63 and 64 each driven by an amplified signal obtained by amplifying the load signal from the inverting amplifier circuit 35 by an summing amplifier circuit 61 and 62, respectively, with an air blowing capacity corresponding to the thermal load. .

加算増幅回路６１．６２は反転増幅回路３５よりの負荷
信号とともに、左側または右側光センサからの電圧信号
をそれぞれ入力して、車室左側部分および車室右側部分
に対する供給空気量を修整する。ここで、電圧信号■し
とＶＲとは車室の左側部分と右側部分との熱負荷の差異
を表わす。入力抵抗６５〜６８は、熱負荷信号に対する
日射による修整効果の大きさを調整する役目を有する。The summing amplifier circuits 61 and 62 input the load signal from the inverting amplifier circuit 35 as well as the voltage signal from the left or right optical sensor, respectively, to correct the amount of air supplied to the left side portion of the vehicle interior and the right side portion of the vehicle interior. Here, the voltage signals 1 and VR represent the difference in heat load between the left and right parts of the passenger compartment. The input resistors 65 to 68 have the role of adjusting the magnitude of the modification effect of solar radiation on the thermal load signal.

以上の構成になる装置において、キースイッチ７１が投
入されると車載バッテリ７０から給電が開始され、定電
圧回路７２より定電圧を必要とする回路素子に定電圧が
与えられる。In the device configured as described above, when the key switch 71 is turned on, power supply from the on-vehicle battery 70 is started, and a constant voltage is applied from the constant voltage circuit 72 to circuit elements that require constant voltage.

この動作状態において、車室熱負荷と蒸発器の上、下流
間の温度差とから得られる現実の冷却能力とが比較回路
４０で比較され、その比較結果により圧縮ｆｉ５０の冷
媒吐出能力が調節される。この際、車室熱負荷としては
素子３１〜３３と光センサ３６．３７による日射も加味
される。もし、蒸発器１１の上、下流間の温度差が熱負
荷に見合う十分な大きさであるとき、電磁クラッチ５１
が消勢されて圧縮機５０は動力源から遮断される。In this operating state, the comparison circuit 40 compares the cabin heat load and the actual cooling capacity obtained from the temperature difference between the upper and downstream sides of the evaporator, and the refrigerant discharge capacity of the compression fi 50 is adjusted based on the comparison result. Ru. At this time, solar radiation from the elements 31 to 33 and the optical sensors 36 and 37 is also taken into consideration as the cabin heat load. If the temperature difference between the upper and lower reaches of the evaporator 11 is large enough to meet the heat load, the electromagnetic clutch 51
is deenergized and the compressor 50 is cut off from the power source.

また、温度差が熱負荷に満たないときは、電磁クラッチ
５１は付勢される。Furthermore, when the temperature difference is less than the thermal load, the electromagnetic clutch 51 is energized.

この場合、圧縮機５０の作動は作動、停止を決定する熱
負荷の大きさが連続的に変位する。たのように、冷凍サ
イクルの冷却能力を、蒸発器１１の上、下流間の空気温
度差を熱負荷に見合うように制御することにより、車室
内に供給される空気の温度（熱量）は、その時々の熱負
荷に見合うものとなる。In this case, the magnitude of the heat load that determines whether the compressor 50 is activated or stopped changes continuously. As mentioned above, by controlling the cooling capacity of the refrigeration cycle so that the air temperature difference between the upper and lower reaches of the evaporator 11 is commensurate with the heat load, the temperature (calorific value) of the air supplied into the vehicle interior can be It is suitable for the heat load at that time.

さらに、車室の左側および右側に供給される空気量は、
日射量に対応して個別に制御されるために、車室の左側
および右側における空気温度をほぼ一致させて、設定温
度に維持させ得る、。Furthermore, the amount of air supplied to the left and right sides of the passenger compartment is
Since they are individually controlled according to the amount of solar radiation, the air temperatures on the left and right sides of the passenger compartment can be made approximately the same and maintained at a set temperature.

なお、本発明は上述したアナログ電気回路による構成の
ほか、マイクロコンピュータを用いてアナログ計算をデ
ジタル計算に置き換えて実現することもできる。また、
圧縮機５０はその容量を３段階以上に調節可能なものを
用いることもできる。In addition to the configuration using the analog electric circuit described above, the present invention can also be realized by using a microcomputer to replace analog calculations with digital calculations. Also,
The compressor 50 may be one whose capacity can be adjusted in three or more stages.

し発明の効果］ 以上のように本発明によれば、圧縮機の作動、停止が蒸
発器の上、下流空気温度に対応して制御されるため、吹
出空気温度の変動が少なく車室内空気温度を安定に設定
温度に維持させ得る。また、車室全体への供給空気温度
を変えないで、供給空気量を部分毎に修整することによ
り、各部の温度が非所望に変化することがなくなる。[Effects of the Invention] As described above, according to the present invention, the operation and stopping of the compressor are controlled in accordance with the air temperature above and downstream of the evaporator, so that fluctuations in the temperature of the blown air are reduced and the temperature of the air inside the vehicle is reduced. can be stably maintained at the set temperature. Moreover, by adjusting the amount of air supplied to each part without changing the temperature of the air supplied to the entire vehicle interior, the temperature of each part will not change undesirably.

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

第１図は本発明が適用される空調装置の配置図、第２図
は本発明の一実施例を示す電気結線図である。 １１・・・蒸発器、１３・・・温度センサ（第１の信号
発注手段）、１４・・・温度センサ（第２の信号発生手
段）、２０・・・差動増幅回路（温度差信号発生手段）
、３１・・・設定抵抗、３２・・・内気温度センサ、３
３・・・外気温度センサ、３５・・・反転増幅回路、３
６・・・光センサ−３７・・・光センサ（符号３１〜３
７の素子で負荷信号発生手段をなす）、４０・・・比比
較回路、４１・・・駆動回路、４２・・・駆動リレー、
５１・・・電磁クラッチ（符号４０〜４２．５１の素子
で空気温度調節手段をなす）、１２Ａ、１２Ｂ・・・送
　　風装置、６１．６２・・・加算増幅回路、６３．６
４・・・モータ（符号６１〜６４の素子で空気量調節手
段をなす）。FIG. 1 is a layout diagram of an air conditioner to which the present invention is applied, and FIG. 2 is an electrical wiring diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 11... Evaporator, 13... Temperature sensor (first signal ordering means), 14... Temperature sensor (second signal generating means), 20... Differential amplifier circuit (temperature difference signal generation) means)
, 31... Setting resistance, 32... Inside air temperature sensor, 3
3...Outside temperature sensor, 35...Inverting amplifier circuit, 3
6... Optical sensor-37... Optical sensor (code 31-3
7 elements constitute load signal generation means), 40... ratio comparison circuit, 41... drive circuit, 42... drive relay,
51... Electromagnetic clutch (elements 40 to 42.51 constitute air temperature control means), 12A, 12B... Air blower, 61.62... Addition amplifier circuit, 63.6
4...Motor (elements 61 to 64 constitute air amount adjusting means).

Claims (1)

【特許請求の範囲】 圧縮機とこの圧縮機によって圧送される冷媒の蒸発器を
含む空気冷却装置と、 前記蒸発器の上流側空気温度に応じた第１の信号を発生
する第１の信号発生手段と、 前記蒸発器の下流側空気温度に応じた第２の信号を発生
する第２の信号発生手段と、 前記第１、第２の信号より前記蒸発器の上、下流の空気
温度差に応じる温度差信号を発生する温度差信号発生手
段と、 車室の熱負荷に応じた熱負荷信号を発生する負荷信号発
生手段と、 前記熱負荷のうちの車室の第１の部位と第２の部位との
熱負荷の差異に相当する差異信号発生手段と、 前記温度差信号発生手段の温度差信号と前記負荷信号発
生手段の前記熱負荷信号との差に基づいて前記圧縮機の
圧縮作動を制御する空気温度制御手段と、 前記負荷信号発生手段の前記熱負荷信号に基づき前記差
異信号発生手段の差異信号に対応して修整された値に相
応する送風量を前記蒸発器を介して前記車室の第１の部
位と第２の部位とにそれぞれ供給する空気量調節手段と
、 を備えてなる車両空調装置のための制御装置。[Scope of Claims] An air cooling device including a compressor and an evaporator for the refrigerant pumped by the compressor, and a first signal generation device that generates a first signal depending on the air temperature upstream of the evaporator. a second signal generating means for generating a second signal corresponding to an air temperature downstream of the evaporator; temperature difference signal generation means for generating a temperature difference signal corresponding to the heat load of the vehicle interior; load signal generation means for generating a heat load signal responsive to the heat load of the vehicle interior; a difference signal generating means corresponding to the difference in heat load between the parts, and a compression operation of the compressor based on the difference between the temperature difference signal of the temperature difference signal generating means and the heat load signal of the load signal generating means. air temperature control means for controlling the temperature of the air; A control device for a vehicle air conditioner, comprising: air amount adjusting means for respectively supplying air to a first portion and a second portion of a vehicle interior.