JPS62116844A - Central monitor and control system for air-conditioning machine - Google Patents

Abstract

PURPOSE:To permit respective terminal controllers to carry out the automatic control of air conditioning employing optimum control constants every day and realize stabilized air- conditioning throughout a year by a method wherein the optimum value of a necessary control constant is operated every day throughout a year and a day having the nearest pattern in reference the weather forecast and a standard weather data of the day is selected while the control constant of that day is commanded from the CPU to respective terminal controllers. CONSTITUTION:A proper control constant is assumed in the CPU 10 as an initial value and the control condition of an air-conditioning space is simulated by employing the control constant to decide whether an excessive amount (difference) is exceeding predetermined upper and lower limits or not based on the result of the simulation whereby the control constant is corrected when the difference has exceeded the upper or lower limit to determine the optimum control constant. The control constant and the latest weather information, sent by a weather satellite and inputted by an operating means 61, are analyzed in the CPU 10 and a weather condition, optimum for an anticipated weather condition, is determined by a control constant determining means 63 while collating it with a standard weather data and, thereafter, the optimum control constants are commanded to respective terminal controllers 301-30n from the CPU 10 by a control constant commanding means 64.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a central monitoring and control system for air conditioners in buildings, etc., in which a terminal controller connected to each air conditioner automatically controls the air conditioners based on commands from the central device. This invention relates to a distributed control central supervisory control system.

Conventional Technology In general, in central monitoring and control systems for air conditioners in buildings, distributed control systems that automatically control the air conditioners in accordance with control commands given from a central device via a transmission line have become widespread ( For example, the special public service in 1977-
172131).

Problems to be Solved by the Invention However, in the conventional central monitoring and control system, the control constants for automatic air conditioning control to be executed by each terminal controller generally vary depending on the thermal characteristics of the target air-conditioned space. The decision was made through on-site adjustments before and after the building was completed. However, the on-site adjustment required a great deal of effort.

Furthermore, although the on-site adjustment is performed before and after the building is completed, the control constants determined by this adjustment can only satisfy a limited portion of the thermal characteristics of the target air-conditioned space, which vary from season to season. It has been difficult to determine optimal control constants for each season throughout the year and to implement stable automatic control.

Furthermore, even if a system that predicts and determines the optimal control constants for each season and changes the control constants for each season is realized, it will not be able to cope with fluctuations in the thermal characteristics of the target air-conditioned space due to daily changes in weather. There were many days when automatic control was performed using inappropriate control constants, and it was not possible to perform automatic control that was truly stable throughout the year.

The present invention takes into account the above-mentioned conventional problems and provides a central monitoring and control system for air conditioners that can automatically control each air-conditioned space using optimal control constants throughout the year while minimizing the number of on-site adjustment steps. be.

Means for Solving the Problems The present invention provides a central device that centrally manages a plurality of distributed air conditioners, and a system that is provided corresponding to each of the air conditioners and based on commands given from the central device. multiple terminal controllers that automatically control the applicable air conditioners,
It consists of a common transmission line that connects the plurality of terminal controllers and the central device, and the central device is necessary when the terminal controller executes automatic control based on standard weather/data input in advance. a control constant calculation means (60) for calculating a control constant, a weather information input means, a weather forecast determination means for determining a weather forecast by analyzing the weather information manually input by the weather information input means, and the weather forecast control constant determining means for determining the control constant by comparing the weather forecast data determined by the determining means with the standard weather data; and control for instructing each terminal controller to use the control constant determined by the control constant determining means. constant command means.

According to the above-described configuration, the present invention simulates the control state of each air-conditioned space based on standard weather data in the central device, and determines the optimum value of the control constant necessary for executing automatic air-conditioning control for each day throughout the year. , calculates, compares the weather forecast for that day with standard weather data, selects the day with the closest pattern, and then instructs each terminal controller to control constants for the corresponding day from the central device. By using control constants to automatically control air conditioning, it is possible to create a stable air-conditioned space throughout the year.

Embodiment FIG. 1 is a configuration diagram of an embodiment of the central monitoring and control system for an air conditioner according to the present invention, FIG. 2 is an indoor temperature change diagram showing the principle of determining control constants, and FIG. 3 is a program for calculating control constants. FIG. 4 shows a flowchart of an example of a program for simulating the control state of an air-conditioned space.

The present invention will be described in detail.

In the figure, '1 (t) is the central unit that centrally controls the air conditioners 20□~2on installed distributed within the building.
0□ to 30n are terminal controllers that automatically control the corresponding air conditioners 201 to 20n, respectively, according to commands given from the central unit (lO), and the internal configuration is a general microcomputer. (40) is a transmission line for coupling the central device (lo) and the terminal controllers 30□ to 30n, and commands from the central device (10) are transmitted through the transmission means of the central device 00) and the terminal controllers 301 to 30n. Each terminal controller 30
□~30r1, and each terminal controller 30□~30
]1 is sent to the central unit for common use.

(50) is a parabolic antenna for the central bag 11ft (10) to receive weather information sent from the meteorological sanitary station, and has a built-in interface circuit for inputting the weather information to the central unit (1). .

The central device (10) includes a control constant calculation means (6o) that calculates in advance control constants required when the terminal controllers 30□ to 30n execute automatic control based on standard weather data input in advance. and a parabolic antenna (50
), a weather information manual means (61) that directly inputs weather information from the meteorological station; and a weather forecast determining means that analyzes the weather information input by the weather information input means (61) and determines the weather forecast for the day. (62) and weather forecast determination means (
Control constant determining means (63) that compares the weather forecast determined by 62) with standard weather data and determines the optimal control constants.
Then, the determined control constant is transmitted to each terminal controller 30□ to 3.
The control constant command means (64) provides commands to the control constants 0n via the transmission line (40) via the central device (+0).

Next, the principle of the control constant calculating means (60) will be explained with reference to FIGS. 2 to 4.

In general, air conditioners 20 to 20i
The environment of the air-conditioned space is maintained appropriately by appropriately driving the various actuators installed in the air conditioner, but the basics are as follows: Equation (11) and operation equation (2) are expressed as follows.

Here, MV is the valve position output, θ is the deviation of the measured value from the set value, K is the proportional gain, T1 is the integration time, and τ is the sampling period. And Kp + ' in this formula:
If the control constants such as ll' 1 + τ are appropriately selected, the temperature in the air-conditioned space will be established quickly and the amount of excess will be small, as shown in Figure 2, but if the control constants are inappropriate, the indoor temperature will decrease. Hunting occurs, the establishment time becomes longer, and the amount of overshoot becomes larger.

Next, as an embodiment of the present invention, the process of calculating control constants when focusing on the overshoot amount will be explained using the flowchart shown in FIG.

In the central device (10), a suitable control constant is assumed as an initial value in step (70), the control state of the air-conditioned space is simulated using this control constant in step (71), and the overshoot amount ( Check whether the deviation) did not exceed the predetermined upper and lower limits.
2), and if the deviation exceeds the upper and lower limits, step (
The optimum control constant is determined by modifying the control constant in step 73) and repeating from step (71).

There is also a program (71) that simulates the control state.
) The outline will be explained using Fig. 4.

First, in step (80), building data (81) sets the shape of the target air-conditioned space, thermal characteristics calculated from the building structure, etc., the ability of the air conditioner to air-condition the target air-conditioned space, and the configuration of the actuator. Device data (82) for setting control constants, etc. are input, and these are calculated and initialized in step (83). Next step (84) ~
The control state of the air conditioned space is calculated in the time loop of step (SS). First, in step (84), the standard weather data (85) of the day on which the simulation is to be executed is input, and the air conditioner is The air conditioning control is calculated in step (86), the indoor environment is calculated from the disturbance and the results of the air conditioning control in step (87), and the results are stored and output in step (88). The saved calculation result (89) is then used as the step (
72).

In this way, in the central unit (20), the control constants and the calculation means (61) analyze the weather information sent from the latest meteorological satellite input, and the weather forecast determination means (61) analyzes the weather information sent from the latest meteorological satellite.
2) determines the weather forecast for the day.

Then, the control constant determining means (63) determines the standard meteorological data (
85), and the control constant command means (64) sends each terminal controller 30 from the central device ('O).
1 to 30n.

As described above, according to the embodiment of the present invention, the central device (10
) determines the control constant that best suits the weather conditions of the day, and each terminal controller 30□ to 30n executes automatic control using the commanded control constant, so that the optimal control constant is always used. It turns out.

In the embodiment of the present invention, the central unit (10) directly inputs weather information sent from a weather satellite to make a weather forecast. By inputting and analyzing charts, etc., it is possible to determine even more accurate weather forecasts.

Effects of the Invention As in the configuration of the present invention, by predicting and determining control constants related to daily weather changes in the central device,
The on-site adjustment of control constants is minimized, and each terminal controller can automatically and always use the optimal control constants to perform automatic air conditioning control, greatly reducing the administrator's labor and creating a stable air-conditioned space throughout the year. This has the practical effect of saving energy or maintaining comfort.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a central monitoring and control system for an air conditioner according to an embodiment of the present invention, Fig. 2 is an indoor temperature change diagram showing the principle of determining control constants, and Fig. 3 is a diagram of a program for calculating control constants. An example of a flowchart, FIG. 4, shows a flowchart of an example of a program for simulating the control state of an air-conditioned space. lO: Central unit 20 to 20...Air conditioner l
n 30 to 30...Terminal controller 40: Transmitter I
n 50: Parabolic antenna 61: Weather information input means
62; Weather forecast determining means 63: Control constant determining means 64: Control constant command means Patent applicant: Matsushita Seiko Co., Ltd. Patent attorney Isao Abe □p￥1 Figure 2

Claims (1)

[Claims] A central device centrally manages a plurality of air conditioners installed in a distributed manner, and a plurality of air conditioners provided corresponding to each of the air conditioners and automatically controlling the corresponding air conditioners based on commands given from the central device. It consists of a terminal controller and a common transmission path that connects the plurality of terminal controllers and the central device, and the central device allows the terminal controller to perform automatic control based on standard weather data input in advance. a control constant calculation means (60) that calculates control constants required for the case; a weather information input means; and a weather forecast determination means that analyzes the weather information input by the weather information input means and determines a weather forecast; control determining means for determining the control constants by comparing the weather forecast data determined by the weather forecast determining means with the standard weather data; and commanding the control constants determined by the control constant determining means to each of the terminal controllers. A central monitoring and control system for an air conditioner, comprising a control constant command means for controlling.