JPH0820117B2 - Centralized control hot water storage type electric water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a centralized control suitable for use in a hot water storage type electric water heater centralized control system in which a plurality of electric water heaters are controlled by a single central processing unit. Type hot water storage type electric water heater.

[Prior Art] In recent years, in order to prevent as much as possible a temporary reduction of the power load in the midnight power time zone and level the power load, a power company or the like is provided with energization control of a plurality of electric water heaters in the midnight power time zone. A centralized control system for hot water storage type electric water heaters, which is controlled by a central processing unit, has been developed, and test operation has been started in some parts. An example of this centralized control system and an example of a hot water storage type electric water heater used in this system are disclosed in JP-A-64
-23057. In this system,
The required energization time is calculated by a plurality of hot water storage type electric water heaters and the calculation result is transmitted to the central processing unit. The central processing unit, based on the required energization time of each electric water heater transmitted, energizes each hot water storage electric water heater so as to prevent and level the power load temporarily during the midnight power time period. The start time is calculated and a control command necessary for starting energization is sent to each hot water storage type electric water heater. In the conventional central control hot water storage type electric water heater, when the control command for the energization start time is received from the central processing unit, the energization of the heater is started at the designated time, and the heater is energized as appropriate. It is boiling.

[Problems to be Solved by the Invention] In the conventional centralized control hot water storage type electric water heater, power supply to the heater is not controlled unless a control command regarding the power supply start time is received from the central processing unit. Therefore, in the conventional central control hot water storage type electric water heater, if a situation occurs in which the control command from the central processing unit is not input to the electric water heater due to a failure of the central processing unit or a failure of the communication line, the hot water is used to store hot water at midnight. The problem arises that you cannot do it.

The object of the present invention is, even if the control command is not input from the central processing unit by the predetermined time limit due to an accident,
It is to provide a centralized control hot water storage type electric water heater that can boil hot water at its own discretion.

Another object of the present invention is to provide a centralized control hot water storage type electric water heater capable of promptly recovering the system by prioritizing control commands from the central processing unit after recovery from an accident.

[Means for Solving the Problems] The central control type hot water storage type electric water heater of the present invention, like the conventional electric water heater, is of course provided with a tank and a heater, and is based on the amount of remaining hot water and the like. Required energizing time calculating means for calculating the required energizing time of the heater, an interface section for transmitting the calculation result of the necessary energizing time calculating means to the central processing unit and receiving a control command from the central processing unit, and to the heater according to the control command And an energization control device for controlling energization of the. In the present invention, further, a control command determining means for determining the presence or absence of a control command from the central processing unit, and a required energizing time calculating means if the control command is not transmitted by the time limit after the start of the midnight power time And a self-control command generating means for giving a self-control command necessary for energizing the heater to the energization control device based on the calculation result of.

Further, in the invention of claim 2, when the energization control device inputs a control command from the central processing unit after the self-control command is input, the energization control device thereafter controls energization to the heater according to the control command.

[Operation] In the present invention, the control command determination means detects that the control command is not input due to a failure of the central processing unit and a failure of the communication line. If the control command is not transmitted by the time limit, the self-control command generating means supplies the self-control command necessary for energizing the heater based on the calculation result of the necessary energization time calculating means. Give to. Therefore, according to the device of the present invention, even if a failure of the central processing unit and a line failure occur, the hot water can be boiled up to a desired temperature within a predetermined time period. In particular, according to the present invention, the self-control command generating means gives the self-control command to the energization control device only when the control command is not transmitted by the time limit after the start of the midnight power time. If the accident is recovered afterwards until the time limit is reached,
The centralized control system can be promptly restored.

According to the second aspect of the invention, even if the energization control device is operating according to the self-control command, if the control command is transmitted from the central processing unit due to the recovery of the accident, the electric power is controlled according to the control command from the central processing device. Control the water heater. Therefore, the system can be promptly recovered after the accident is recovered. The invention of claim 2 is particularly effective when the central processing unit commands not only the on-time (energization start time) of energization to the heater but also the off-time (energization stop time).

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of a system when the hot water storage type electric water heater of the present invention is applied to a centralized control system. In the figure, 1 is a hot water storage type electric water heater, 2 is a hot water tank, 3 is a hot water inlet, 4 is a heater, 5 is a water temperature detecting sensor,
6 is a remaining hot water amount detection sensor, and 7 is a water supply port. Electric power is supplied to the heater 4 from a power source 9 via a switch 8 that opens and closes according to a control command. Reference numeral 10 is a water heater controller having a microcomputer therein. Water heater controller 10
The temperature of the hot water in the tank 2 is set to a predetermined temperature by the conditions such as the feed water temperature detected by the water temperature detection sensor 5, the remaining hot water amount detected by the remaining hot water amount detection sensor 6, and the boiling temperature set by the boiling temperature setting device 11. Heater for controlling the opening / closing of the switch 8 in accordance with the required energization time calculation means for calculating the energization time of the heater 4 required to boil up to the temperature and the control command transmitted from the central processing unit 13 via the interface section 12. An energization control device for controlling the energization to No. 4, a control command determining means, which will be described later, and a self-control command generating means. The interface unit 12 has a function of transmitting the required energization time calculated by the water heater controller 10 to the central processing unit 13 and also transmitting a control command transmitted from the central processing unit 13 to the water heater controller 10. Data of the required energization time is transmitted to the central processing unit 13 from a plurality of water heaters 1 ... Through a communication line. The central processing unit 13 calculates the energization start time of each water heater on the basis of these data, and sends a control command necessary for starting energization to each water heater.

The command content and the number of commands of the control command transmitted from the central processing unit 13 differ depending on the control mode of the water heater controller 10. For example, a water heater controller with a clock function inside
At 10, when the predetermined time comes, the necessary energizing time is calculated and the calculation result is transmitted to the central processing unit 13, and the central processing unit 13
When the energization start time is designated by, the control mode in which energization to the heater is started at that time and energization is stopped thereafter may be adopted. In this case, the central processing unit
13 basically transmits only a control command for instructing the energization start time. On the other hand, in the water heater control device 10 that does not have a clock function inside, the necessary energization time is calculated according to the data transfer command from the central processing unit 13, and the calculation result is transmitted,
Further, there is also one that starts energization to the heater 4 in response to an energization start command from the central processing unit 13 and stops energization to the heater 4 in response to an energization stop command. The present invention can be applied to a water heater operated in any control mode.

FIG. 2 is a diagram substantially corresponding to claims of the water heater of the present invention. Here, the required energization time calculating means 101 may use a known calculation method, for example, a necessary temperature difference from the temperature set by the boiling temperature setting device 11 and the water temperature detected by the water temperature detection sensor 5. Then, the residual hot water amount in the tank is calculated from the water temperature detected by the water temperature detection sensor 5 and the hot water temperature in each part of the tank detected by the residual hot water amount detection sensor, and the required thermal calorie is calculated from the temperature difference and the residual hot water amount. The required energization time may be calculated from the capacity and the heat calorie. The control command determination means 102 determines the presence or absence of a control command input via the interface 12, and when a predetermined control command is input, transmits the command to the energization control device 103. If the control command determination means 102 determines that the predetermined control command is not input by the time limit, the control command determination means 102 activates the self-control command generation means 104. When there is no control command from the central processing unit 13, the self-control command generating means 104 generates a self-control command necessary to energize the heater 4 based on the calculation result calculated by the necessary energization time calculating means 101. Output to the energization control device 103. Here, the "necessary self-control command" means a control command (data transfer command, data transfer command, which is scheduled to be transmitted from the central processing unit, although it depends on the control mode.
If no midnight power time start command, heater energization start command, heater energization stop command, midnight power time end command, etc.) is sent, the heater 4 is sent to the heater 4 on the basis of the calculation result calculated by the necessary energization time calculation means 101. It means all commands required to control the energization. The self-control command generating means 104
When a control command is input from the central processing unit 13 after the start of the operation, the energization control device 103 may be controlled thereafter according to the control command from the central processing unit 13.

In FIG. 3, the water heater control device 10 has a clock function inside, and at a predetermined time itself, calculates the required energization time and sends the calculation result to the central processing unit 13, and the central processing unit 13 starts energization. A flow chart of an embodiment in which the present invention is applied to a water heater operated in a control mode in which when a time is designated, energization of a heater is started at that time and energization is stopped when the temperature of hot water reaches a set temperature. Is. In this example,
Since it has a clock function inside the water heater controller 10,
When the midnight power time is started (step ST3-1), the required energization time calculation means 101 calculates the required energization time to the heater 4 (step ST3-2). Then, the calculation result is automatically transmitted to the central processing unit 13 via the interface unit 12 (step ST3-3). The central processing unit 13 calculates the energization start time of each electric water heater based on the required energization time transmitted from a plurality of electric water heaters, and outputs a control command to instruct each electric water heater of the energization start time. It is transmitted (steps ST3-4, 3-5). In this example, the control command determination means 10
2 determines whether or not the control command is transmitted by the predetermined time limit (step ST3-6). In this embodiment, since the control device has a clock inside, the time limit is determined using this clock. Under normal conditions, a control command is transmitted by the time limit, and this control command is input to the energization control device 103. Energization control device 103 in this case
Has a function of outputting an ON signal to the switch 8 to turn on the switch 8 at the instructed energization start time, and a switch when the self-control command is input from the self-control command generating means 104 described later. 8 has a function of outputting an ON signal. When the switch 8 is turned on, the heater 4 is energized (steps ST3-8, 3-9). Energization of the heater 4 is continued until the temperature sensor detects that the hot water temperature has reached the set temperature, and when the hot water temperature reaches the set temperature, the energization control device 103 outputs an off signal to the switch 8 to open / close the switch. Turn off the heater 8 and stop energizing the heater 4 (step ST
3-10, 3-11). As the temperature sensor for detecting the hot water temperature to stop the energization of the heater 4, a temperature sensor used for the water temperature detecting sensor 5 or the remaining hot water amount detecting sensor 6 can be used.

When the control command is not transmitted by the time limit due to the failure of the central processing unit 13 or the failure of the communication line, the control command determining means 102 outputs a start signal to the self-control command generating means 104. When the activation signal is input, the self-control command generation means 104 commands the required energization time calculation means 101 to perform calculation, and based on the calculation result of the required energization time calculation means 101, the self-control command generation means 104 performs the self-control The control command is output to the energization control device 103. Self-control command generator 1 in this case
04 is a remaining time calculation function for calculating the remaining time of the midnight power, and a determination function for determining whether the required energization time calculated by the required energization time calculation means 101 is equal to or longer than the remaining nighttime power remaining time. And have. The self-control command generating means 104 outputs a self-control command when the required energization time is equal to or longer than the midnight power remaining time (step ST3-7). When the self-control command is input, the energization control device 103 outputs an ON signal to the switch 8 to turn on the switch 8 and energize the heater 4 (step ST3-9). The subsequent operation is the same as in the normal case.

As described above, according to this embodiment, even when a failure occurs in the central processing unit 13 or the communication line, the hot water can be boiled up to a predetermined boiling temperature by using the midnight power.

As a modified example of this embodiment, when the control command from the central processing unit 13 is not input, the self-control command means
As the required energizing time used for determination in 104, the central processing unit 1
It is also possible to store the required energization time transmitted to 3 in an appropriate memory and use the stored required energization time. Further, a function of counting the required energization time is added to the energization control device 103, and after the energization of the heater 4 is started, the counting of the required energization time is started and when the counting is finished, an OFF signal is given to the switch 8. The energization control device 103 may be configured to output. Further, the self-control command generating means 104 may be configured to output the self-control command immediately when the activation signal is input from the control command determining means 102.

Further, in the above embodiment, the control command determining means 102 determines whether or not there is a control command, and determines whether or not a predetermined control command has been input to the self-control command generating means 104 by the time limit. May be given. In this case, unlike the above embodiment, the control command determination means 102
No activation signal is output from the control command determining means 102, and the control command determining means 102 changes the control command input state to the self-control command generating means 104.
Instruct.

Next, the internal function of the water heater control device 10 does not have a clock, and the central processing unit 13 is instructed by a command from the central processing unit 13.
Centralized control hot water storage type electric hot water operated in control modes of transferring data to 13, confirming start of midnight power time, starting energization of heater 4, stopping energization of heater, and confirming end of midnight power time An example in which the present invention is applied to a container will be described. The control command output from the central processing unit 13 is a data transfer command for instructing calculation and transfer of the required energization time, a midnight power time start command notifying that the midnight power time has started, and a start of energization to the heater. A heater energization start command for instructing, a heater energization stop command for instructing to stop energization of the heater, and a midnight power time end command for instructing the end of the midnight power time. FIG. 4 shows a flow chart of this embodiment. In order to carry out this embodiment, a plurality of control commands (data transfer command, midnight power time start command, heater energization) are sent from the central processing unit 13 to the control command determination means 102 of the claim correspondence diagram shown in FIG. (Start command, heater energization stop command, midnight power time end command), and a data transfer command to the required energization time calculation means 101 when a data transfer command is input from the central processing unit 13. It has the function to give. Further, the required energization time calculation means 101 is provided with a function of transferring the calculation result to the central processing unit 13 in response to the transfer command from the control command determination means 102. Further, the self-control command generating means 104 is provided with a self-timer. This self-timer is reset by the midnight power time start command, starts counting the time with 0 hours as an initial value, and when the midnight power time start command is not input, the self timer starts.
When 25 hours (24 hours on the previous day + 1 hour) are counted, they are reset and the hour coefficient is started with 1 hour as the initial value. Further, in this embodiment, the self-control command generation means 104 has a function of outputting a self-control command for starting energization of the heater to the energization control device when the heater energization start command is not input from the central processing unit 13. In addition, when the heater energization stop command is not input from the central processing unit 1, a function of outputting a self-control command for stopping energization of the heater to the energization control device is provided.

This embodiment will be described with reference to the flowchart of FIG. In this example, the required energization time calculation means 101 constantly calculates the required energization time. Then, the control command determination means 102
Determines whether there is a data transfer command and determines that the data transfer command has been transmitted from the central processing unit 13, the required energization time calculation means 101 transfers the calculation result (required energization time) to the central processing unit (step ST4-1, 4-2, 4-3).
If the data transfer command does not arrive due to the occurrence of a failure, proceed to the previous step. Next, when the control command determination means 102 determines the input of the midnight power time start command, the control command determination means 102 resets the self timer built in the self control command generation means 104 to 0 hours (steps ST4-4, 4). −
5). In the current midnight power supply system, the midnight power time start command is transmitted from the central processing unit at 23:00 (11:00 pm). When the midnight power time start command is not input to the control command determination means 102 before the first time limit (the time at which the self-timer counting the time from the previous day counts 25 hours) is reached, steps ST4-1 to ST4-1 Repeat 4-4 (step ST4-6). Further, when the midnight power time start command is not input to the control command determination means 102 even when the first time limit is reached, the self-timer is reset to start counting with the initial value as one hour, and the second time limit is set. It is set (steps ST4-6, 4-7). This is 23:00 (pm
This is a device for making 1 hour from 11:00) to midnight the time to wait for the recovery of the accident of the central processing unit 13 or the communication line. The accident recovered within the last hour, and the central processing unit
When the control command determination means 102 determines that the midnight power time start command is input from 13, the control is performed in accordance with the command from the central processing unit 13 thereafter. In this case, the self-timer is reset to 0 hour, but if the normal operation is performed, it returns to the normal state by the input of the midnight power time start command on the next day, so there is no problem. In the above operation, when the midnight power time start command is not input by the time limit, the self-control command generation means 104 detects that the self-timer is in the midnight power time zone. Can be considered

When the control command determination means 102 determines that the heater energization start command has been input, the energization control device 103 outputs an ON signal for turning on the switch 8 (step ST4-
8).

If the heater energization start command is not input by the third time limit, the self-control command generation means 104 outputs a self-control command for starting energization (step ST4-
9). The third time limit here is determined in the self-control command generation means 104. That is, the self-control command generating means 104
Is calculated when the remaining time of the midnight power is calculated with the counting time of the self-timer as the time, and when the required energization time calculated by the required energization time calculation means 101 becomes equal to the remaining nighttime power remaining time or when it is detected that it is longer. Is determined as the third time limit, and if the heater energization start command is not input by that time, the self-control command for energization start is output (step ST4-9). When the self-control command is input, the energization control device 103 outputs an ON signal to the switch 8 to turn on the switch 8 and energize the heater 4 (step ST4-10).

Next, the control command determination means 102 determines whether or not a heater energization stop command has been input from the central processing unit 13. At this time, if the failure in the central processing unit 13 or the communication line is recovered, the energization control device 103 outputs an OFF signal to the switch 8 in response to the command from the control command control means 102, and the switch 8 is switched. The heater 4 is turned off and the power supply to the heater 4 is stopped (steps ST4-11, 4-13). When the control command determination means 102 outputs a signal indicating that the heater energization stop command is not input to the self-control command generation means 104, the self-control command generation means 104 determines the hot water temperature and the boiling set temperature. By comparison, when the hot water temperature reaches the boiling set temperature, a self-control signal for stopping the power supply to the heater is output to the power supply control device 103. When the self-control signal is input, the energization control device 103 outputs an off signal to the switch 8 to turn off the switch 8 and stop energizing the heater 4 (step ST4
-12, 4-13). As the temperature sensor for detecting the hot water temperature to stop the energization of the heater 4, a temperature sensor used for the water temperature detecting sensor 5 or the remaining hot water amount detecting sensor 6 can be used. Of course, if a heater energization stop command is input from the central processing unit 13 before the self-control command for stopping energization to the heater 4 is output, energization to the heater 4 is stopped according to this command.

When the midnight power time end command is input from the central processing unit 13, the process returns to the start (step ST4-14). When the midnight power time end command is not input, the self-timer of the self-control command generating means 104 returns to the start of counting 9 hours (8 hours of midnight power time + initial value of self timer) (step ST4-15). . In other words, the self-control command generating means 104 outputs a self-control control command indicating the end of the midnight power time when the midnight power time end command is not input.

According to the above-described embodiment operating according to the flow chart of FIG. 4, when the failure occurred in the central processing unit 13 or the communication line is recovered in the midnight power time zone, the central processing unit 13
Since the water heater is operated according to the control command from
The centralized control system can be quickly restored.

In the above embodiment, the self-control command generating means 104 has a function of outputting a self-control command for stopping the stop of energization of the heater 4 when the boiling temperature reaches the set temperature. A function for counting the required energization time is added to the control command generation means 104 so that energization of the heater 4 is stopped when the energization of the heater 4 is started and then the counting of the required energization time is started. Self-control command generating means for outputting self-control command for
104 can also be configured.

EFFECTS OF THE INVENTION According to the present invention, when the control command determination means detects that the control command is not input due to the failure of the central processing unit and the line failure, and the control command is not transmitted by the time limit. , The self-control command generation means gives the self-control command necessary for energizing the heater to the energization control device based on the calculation result of the required energization time calculation means, so that the central processing unit failure and the line failure occur. Even so, hot water can be boiled up to a desired temperature within a predetermined time period.

In particular, according to the present invention, the self-control command generating means gives the self-control command to the energization control device only when the control command is not transmitted by the time limit after the start of the midnight power time. If the accident is recovered after the time reaches the time limit, the central control system can be promptly recovered.

According to the invention of claim 2, even if the energization control device is operating by the self-control command, if the control command is transmitted from the central processing unit due to the recovery of the accident,
Since the electric water heater is controlled according to the control command from the central processing unit, there is an advantage that the system can be promptly recovered after the accident is recovered.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a system when the central control type hot water storage type electric water heater of the present invention is applied to a central control system, and FIG. 2 is a diagram corresponding to claims of the central control type hot water storage type electric water heater of the present invention, FIG. 3 is a flowchart of control when the first embodiment is carried out, and FIG. 4 is a flowchart of control when the second embodiment is carried out. 1 ... Hot water storage type electric water heater, 2 ... Hot water tank, 3 ... Hot water supply port, 4 ... Heater, 5 ... Water temperature detection sensor, 6 ...
Remaining hot water amount detection sensor, 7 ... Water supply port, 8 ... Switch, 9 ...
… Power supply, 10 …… Water heater controller, 11 …… Boiling temperature setting device
11, 12 …… Interface section, 13 …… Central processing unit,
101 ... Necessary energizing time calculating means, 102 ... Control command determining means, 103 ... Energizing device, 104 ... Self-control command generating means.

Claims (2)

[Claims] 1. An energization start time for each hot water storage type electric water heater is calculated based on the required energization time of heaters transmitted from a plurality of hot water storage type electric water heaters to start the energization of each hot water storage type electric water heater. In a centralized control hot water storage type electric water heater that controls the energization of the heater in accordance with the control command from the central processing unit that sends the necessary control command, the required energization that calculates the required energization time of the heater based on the water temperature and the amount of hot water remaining. A time calculation unit, an interface unit that transmits the calculation result of the required energization time calculation unit to the central processing unit and receives the control command from the central processing unit, and controls energization to the heater according to an input command. An energization control device, a control command determination unit that determines the presence or absence of the control command from the central processing unit, and the control command is transmitted by a time limit after the start of the midnight power time. If not, it comprises self-control command generating means for giving the self-control command to the energization control device, which is required to energize the heater based on the calculation result of the necessary energization time calculating means. Centralized control hot water storage type electric water heater. 2. The energization control device controls energization to the heater according to the control command when the control command is input from the central processing unit after the self-control command is input. Centralized control hot water storage type electric water heater described in.