JPH08200774A - Controller for ventilating and air-conditioning system - Google Patents

Abstract

PURPOSE: To elongate electrical and mechanical life and obtain a stabilized temperature characteristic by a method wherein a valve is not opened or closed when a difference between an indoor temperature and a target temperature set value is very small or a time for opening or closing a valve is very short. CONSTITUTION: An target temperature set value, set by a target temperature setting means 27, and an indoor temperature, detected by a temperature sensor 9, are read into a set temperature inputting unit 22 and an indoor temperature inputting unit 23 respectively. When a difference, obtained in a difference deciding unit 28, is higher than a value, set by a deciding value inputting means 29, the difference is sent into a PID control unit 24 to operate while the result of operation is sent into a valve opening and closing time outputting unit 25 to determine the opening and closing time of a valve 7 and open or close the valve 7. When the difference is lower than a set value, the PID control unit 24 does not effect operation and the result of operation is not outputted whereby the opening degree of the valve 7 is kept as it is. According to this method, the electrical and mechanical life of the system can be elongated and a stabilized temperature characteristic can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation air conditioning system equipped with a cold / hot water coil actuator for heating / cooling,
The present invention relates to a control device for a ventilation air-conditioning system, which includes a control means for suitably controlling the cold / hot water coil actuator.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing the configuration of a conventional ventilation and air conditioning system of this type. The ventilation air conditioning system includes a ventilation air conditioning system body 1, a control device 20, and a cold / hot water coil 6.
It is equipped with. The ventilation air conditioning system body 1 is configured to include an exhaust fan 2 that exhausts indoor air to the outside, an air supply fan 3 that supplies the outside air to the room, a heat exchange element 4, and a damper 5.

The outside air is supplied to the room by the air supply fan 3 through the pipe 10, the heat exchange element 4, the air supply fan 3, the pipe 11, the cold / hot water coil 6 and the pipe 12. The air in the room is supplied by the exhaust fan 2 to the pipe 14, the damper 5, the pipe 15,
The heat is discharged to the outside through the heat exchange element 4, the exhaust fan 2, and the pipe 16. To the cold / hot water coil 6, a valve 7 for controlling the supply of the cold / hot heat medium to the coil is connected via a pipe 13, and a valve driving means 8 for opening / closing the valve 7 is connected.

The control device 20 comprises a valve drive control means 21, which has a set temperature input section 22 to which a temperature set value is inputted from a target temperature setting means 27 and an exhaust temperature (indoor temperature). The indoor temperature input unit 23 to which the output of the temperature sensor 9 for detecting the temperature is input, the PID control unit 24 performing comparative calculation control, and the valve opening / closing time for determining the opening / closing time of the valve 7 based on the calculation result of the PID control unit 24. It is composed of an output unit 25 and a contact output unit 26 for converting the calculation result into an ON / OFF contact signal, and the output of the contact output unit 26 is connected to the valve driving means 8.

In the ventilation / air-conditioning system having the above-described structure, the air in the room is exhausted by the exhaust fan 2. When heat exchange is performed at that time, the damper 5 is switched to be sent to the heat exchange element 4 and then exhausted. During normal ventilation, it is not sent to the heat exchange element 4 but is directly exhausted. The room temperature is detected by the temperature sensor 9 in front of the damper 5, and sent to the valve drive control means 21 of the control device 20.

The outside air is supplied by the air supply fan 3 through the heat exchange element 4, passes through the ventilation / air-conditioning system main body 1 and then passes through the cold / hot water coil 6, becomes cold air or warm air, and is sent indoors. The temperature adjustment is performed by controlling the opening / closing control of the valve 7 by controlling the opening / closing control of the valve 7 to control the temperature of the hot / cold heating medium. The valve driving means 8 receives a valve opening / closing signal from the valve driving control means 21 to drive the valve. This is done by means 8.

In the valve drive control means 21 of the control device 20, the target set temperature of the target temperature setting means 27 and the detected temperature (indoor temperature) of the temperature sensor 9 are taken into the set temperature input section 22 and the indoor temperature input section 23, respectively. PID control unit 2
Comparing calculation is performed in 4, and the calculation result is output by the valve opening / closing time output unit 2
5, the opening / closing time of the valve 7 is determined, and a valve opening / closing signal is sent from the contact output unit 26 to the valve driving means 8 to open / close the valve 7.

[0008]

However, in the ventilation air-conditioning system having the above structure, the valve opening / closing signal from the contact output section 26 repeats opening / closing at every calculation cycle, and the electrical contact of the contact of the relay of the contact output section 26 is repeated. However, there is a problem that the mechanical life and the electrical and mechanical life of the valve drive means 8 are extremely reduced. Further, there is a problem in that temperature stability is lacking because the valve is opened and closed instantaneously even with a very slight temperature difference.

Further, there is a contact operation time until the relay contact is established, and depending on the calculation result, a current flows for a moment in the relay coil but the relay contact is not turned on and the valve 7 is not opened or closed. Alternatively, the relay contact caused by the response delay of the valve driving means 8 itself was turned on for a short time, but the valve 7
However, there is a problem that the electrical and mechanical life of the relay contact is shortened before it is driven.

The present invention has been made in view of the above-mentioned points, and has an electrical and mechanical life of a hot and cold water coil actuator for cooling and heating and a relay which outputs an ON / OFF signal for controlling opening / closing of the actuator. An object of the present invention is to provide a control device for a ventilation and air conditioning system that extends the temperature and eliminates wasteful operation of a valve opening / closing output relay to improve temperature stability.

In order to solve the above-mentioned problems, according to the present invention, as shown in FIG. 1, when the outside air is supplied by an air supply fan (3), the outside air is passed through a heat exchange element (4) and a cold / hot water coil ( 6) to the room, and when exhausting the air in the room by the exhaust fan (2), the exhaust passes through the heat exchange element (4) and is then discharged outdoors to cool and heat the heating medium to the hot and cold water coil (6). Ventilation comprising a valve (7) for adjusting the supply of air, a valve drive means (8) for opening and closing the valve (7), a temperature sensor (9), and a control device (20) for controlling the system. In a controller for an air conditioning system, the controller (20) is a temperature sensor (9).
Deviation determination means (determines whether the deviation is equal to or greater than the set value set by the determination value input means (29) by inputting the detected temperature from the target temperature and the target temperature by the target temperature setting unit (27) as input. 28), and when the deviation is determined to be greater than or equal to a set value, a calculating means (24, 25) for calculating a valve opening / closing drive control value based on the deviation, and a valve opening / closing signal to the valve driving means based on the calculation result. It is characterized by comprising means (26) for

Further, as shown in FIG. 2, the control device includes a temperature detected by the temperature sensor (9) and a target temperature setting means (27).
Calculation means (24, 25) for calculating the valve opening / closing drive control value by inputting the target temperature by the calculation result, and the calculation result for judging whether the calculation result is equal to or more than the set value set by the judgment value input means (30). It is characterized by comprising a judging section (31) and means (26) for outputting a valve opening / closing signal to the valve driving means (8) based on the calculation result when the calculation result is judged to be equal to or larger than a set value.

[0013]

According to the present invention, by providing the deviation judging section (28) or the result judging section (31) as described above, the valve is used when the difference between the room temperature and the target temperature set value is very small. When the time is extremely short, the value for judging the temperature difference or time is determined by the response condition of the control system, the output relay, the actuator, etc. so that the valve (7) is not opened and closed. ) Allows adjustment and setting.

[0014]

【Example】

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a control device of a ventilation air conditioning system of the present invention. In FIG. 1, the same reference numerals (numbers) as in FIG. 3 denote the same parts. The valve drive control means 21 includes a temperature setting input section 22, an indoor temperature input section 23,
Deviation determination unit 28, determination value input means 29, PID control unit 24 for performing comparative calculation control, valve opening / closing time output unit 25 for outputting the calculation result and determining the valve opening / closing time, and converting the calculation result to the output of the contact. And a contact output unit 26.

Room temperature input section 23 of valve drive control means 21
The output of the temperature sensor 9 is connected to the set temperature input unit 2
The output of the target temperature setting means 27 is connected to 2. The output of the contact output unit 26 is input to the valve driving means 8.

The target temperature setting value set by the target temperature setting means 27 and the room temperature (exhaust gas temperature) detected by the temperature sensor 9 are taken into the set temperature input section 22 and the room temperature input section 23, respectively, and the deviation judgment section 28 is entered. When the calculated deviation is equal to or more than the value set by the judgment value input means 29, the calculation is sent to the PID control unit 24, and the calculation result is sent to the valve opening / closing time output unit 25 to determine the opening / closing time of the valve 7. , A valve opening / closing signal is sent from the contact output unit 26 to the valve driving means 8,
Open and close.

When the deviation is equal to or less than the set value, the PID control unit 24 does not perform the calculation and the calculation result is not output, so that the valve opening remains as it is. For example, the deviation determination unit 2
When the temperature difference between the target temperature set value input in 8 and the room temperature is 2 ° C. and the set value by the judgment value input means 29 is 1 ° C.,
Deviation> judgment value and the valve 7 is opened and closed.

[Embodiment 2] In the above embodiment, the deviation determining unit 2
8 shows an example in which the opening / closing process of the valve 7 is judged by the temperature deviation value on the input side, but in FIG. 2, an example of judging the opening / closing process of the valve 7 by the opening / closing time value of the output side calculation result of the PID control section 24 is shown. Show.
In this embodiment, only the internal structure of the valve drive control means 21 is different, and only that portion is shown in FIG. As shown in the figure, the result determination unit 3 is provided between the valve opening / closing time output unit 25 and the contact output unit 26.
1 is provided, and the determination value is input to the result determination section 31 from the determination value input means 30.

The target temperature setting means 27 and the target temperature setting from the temperature sensor 9 and the room temperature are respectively set.
2 and the room temperature input unit 23, and the PID control unit 24
The valve opening / closing time output unit 25 determines the opening / closing time of the valve 7. In the result judging section 31, when the opening / closing time of the valve 7 determined by the valve opening / closing time output section 25 is equal to or larger than the judgment value set by the judgment value input means 30, the opening / closing time is converted into a valve opening / closing signal by the contact output section 26. It is converted and sent to the valve drive means 8 to open and close the valve 7.

When the opening / closing time of the valve 7 determined by the valve opening / closing time output unit 25 is less than or equal to the judgment value set by the judgment value input means 30, the valve is not opened / closed and the valve opening is maintained as it is. Become. For example, when the opening / closing time of the valve 7 input to the result judging unit 31 is 0.1 seconds and the setting by the judgment value input means 30 is 0.02 seconds, the opening / closing time of the valve 7> the judgment value and the opening / closing of the valve 7 is performed. Is done.

In the above embodiment, the judgment value input to the deviation judgment unit 28 or the result judgment unit 31 is the judgment input means 29,
The setting can be changed with 30. This setting value is set when fine adjustment is performed in the actual system operation or in consideration of the responsiveness of the relay or actuator used.

In the above embodiment, the contact output relay is used as the contact output section, but it goes without saying that the same effect can be obtained by changing the contact output relay to a contactless relay.

[0023]

As described above, according to the present invention, the ON / OFF frequency of the relay for controlling the opening / closing of the hot / cold water coil actuator for cooling / heating in the ventilation air conditioning system is reduced to extend the electrical and mechanical life. Therefore, it is possible to obtain the excellent effect that it is possible to obtain a stable temperature characteristic by eliminating unnecessary operation of the valve opening / closing relay by controlling the system control system or the response of the relay and the actuator.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a control device of a ventilation air conditioning system of the present invention.

FIG. 2 is a diagram showing a configuration of valve drive control means of the control device for the ventilation air conditioning system of the present invention.

FIG. 3 is a diagram showing a configuration of a control device of a conventional ventilation air conditioning system.

[Explanation of reference numerals] 1 ventilation air-conditioning system main body 2 exhaust fan 3 air supply fan 4 heat exchange element 5 damper 6 hot and cold water coil 7 valve 8 valve drive means 9 temperature sensor 20 control device 21 valve drive control means 22 set temperature input section 23 Indoor temperature input unit 24 PID control unit 25 Valve opening / closing time output unit 26 Contact output unit 27 Target temperature setting unit 28 Deviation determination unit 29 Judgment value input unit 30 Judgment value input unit 31 Result judgment unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Motoyasu Sato 11-11 Haneda-Asahi-cho, Ota-ku, Tokyo Ebara Densan Co., Ltd. (72) Koichi Kido 11-1 Haneda-Asahi-cho, Ota-ku, Tokyo Issue Ebara Densan Co., Ltd.

Claims (2)

[Claims] 1. When supplying outside air with an air supply blower, the outside air is sent to a room through a cold / hot water coil after passing through a heat exchanger, and the exhaust air is exhausted when exhausting the air in the room with an exhaust air blower. After passing through the heat exchanger, it is discharged outdoors and a valve for adjusting the supply of the cold / hot heat medium to the cold / hot water coil, a valve drive means for opening / closing the valve, a temperature detecting means, and the system are provided. In a control device for a ventilation air conditioning system comprising control means for controlling, the control means obtains a deviation by inputting a detected temperature from the temperature detecting means and a target temperature by a target temperature setting means, and the deviation is a judgment value input means. Deviation determination means for determining whether the value is greater than or equal to the set value set by the above, and a calculation means for calculating the opening / closing drive control value of the valve based on the deviation when the deviation is determined to be greater than or equal to the set value; Valve drive Controller ventilation air conditioning system, characterized by comprising means for outputting a valve closing signal to the stage. 2. The control means calculates the opening / closing drive control value of the valve by inputting the detected temperature from the temperature detecting means and the target temperature by the target temperature setting means, and the calculation result is the judgment value input means. A calculation result judging means for judging whether the calculated value is equal to or more than the set value set by the above, and a means for outputting a valve opening / closing signal to the valve driving means according to the calculated result when it is judged that the calculated result is equal to or more than the set value. The control device for the ventilation air conditioning system according to claim 1, wherein