JPH09229474A - Hot water supply controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply controller which makes it possible to always rapidly set a hot water supply temperature to a target hot water supply temperature irrespective of the change of the control characteristics due to the individual difference or aging change of an apparatus. SOLUTION: The hot water supply controller comprises heating amount control means 100 for calculating a target heating amount based on the deviation of the detected hot water supply temperature detected by a hot water supply temperature thermistor 9 from a target hot water supply temperature and controlling so that the heating amount of a water heater A becomes a target heating amount, discriminating means 101 for discriminating whether the control constant in the case of calculating the target heating amount based on the deviation in the means 100 is suitably set or not based on the response change characteristics of the detected hot water supply temperature as the control operation of the amount by the means 100 is executed, and correcting means 102 for correcting the constant in response to the change characteristics when it is discriminated that the constant is not suitably set by the means 101.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply means for heating the water supplied in a flowing manner, a hot water discharge temperature detecting means for detecting the temperature of hot water discharged from the hot water supply means, and a target hot water discharge temperature in the hot water supply means. Target temperature setting means for setting
A target heating amount is calculated based on the deviation between the detected hot water temperature detected by the hot water temperature detecting means and the target hot water temperature, and the heating amount in the hot water supplying means is controlled to be the target heating amount. The present invention relates to a hot water supply control device provided with a heating amount control means for controlling.

[0002]

2. Description of the Related Art In the above hot water supply control device,
For example, as disclosed in Japanese Patent Publication No. 7-81738,
The PID control based on the deviation between the detected hot water temperature and the target hot water temperature is configured to calculate the drive current (corresponding to the target heating amount) of the fuel control valve, and the PID control is performed according to the magnitude of the deviation. There has been a configuration in which the control constant in 1 is selected and set from the values stored in advance in the storage means to avoid overshooting or hunting of the tapping temperature as much as possible.

[0003]

In the above conventional configuration, as compared with the configuration in which the control constant is maintained constant,
Although it has the advantage of being able to suppress overshoot and hunting that occur due to changes in water volume and improve responsiveness, there is still room for improvement in the following points. It was

In the above conventional configuration, one of a plurality of control constants stored in advance in the storage means is selected. Therefore, when the temperature deviation is detected, the deviation occurrence state at that time is detected. The control constant is uniquely determined according to the magnitude of the deviation regardless of the difference. Then, for example, regardless of the change in the control state due to the variation in the characteristics due to the individual difference of the apparatus or the deterioration of the characteristics due to the change over time due to the long-term use of the apparatus, the temperature deviation is large. Since the control constant is determined only by the difference, it is not possible to deal with such variations due to individual differences, and a value different from an appropriate value may be set as the control constant. As a result, overshoot and undershoot of the hot water temperature,
Alternatively, it may not be possible to effectively avoid the occurrence of hunting or the like.

The present invention has been made paying attention to such a point, and an object thereof is always to promptly set the target hot water temperature to the target hot water temperature irrespective of the change in the control characteristics caused by the individual difference of the apparatus or the change over time. The point is to provide a hot water supply control device that can be turned on.

[0006]

According to the characterizing feature of claim 1, as the heating amount control means executes the control operation of the heating amount with respect to the heating means, the discriminating means causes the tapping temperature detecting means. Based on the response change characteristic of the detected hot water temperature detected by, the control constant when calculating the target heating amount based on the deviation in the heating amount control means,
It is determined whether or not it is properly set.

When it is judged by the judging means that the control constant is not properly set, the correcting means corrects the control constant in accordance with the response change characteristic.

That is, since the response change characteristic of the detected hot water temperature is the actual output information after being heated by the heating means, whether or not the control constant is appropriate is determined based on the actual control state of the heating means. If it is determined that the control constant is not proper, the control constant can be always set to the control constant corresponding to the actual control state by correcting the control constant according to the response change characteristic. .

As a result, the control constant is always set to an appropriate control constant according to the condition of the device, regardless of variations due to individual differences in the device and changes over time, and overshoot or undershoot of the tap water temperature or It has become possible to provide a hot water supply control device that suppresses occurrence of hunting as much as possible and has excellent responsiveness.

According to the second aspect of the present invention, in the determining means, the detected hot water temperature is higher than the target hot water temperature when the heating amount control means executes the heating amount control operation. It is configured to determine whether or not the control constant is properly set based on the overheated state duration time during which the overheated state higher than the set amount is continued.

That is, when an overshoot occurs and the above-mentioned overtemperature state continues for a long time, for example, the control constant that defines the follow-up characteristic with respect to the temperature change is too large, and the temperature rise is too rapid. Can be determined.

According to the third aspect of the present invention, in the determining means, the detected hot water temperature is higher than the target hot water temperature when the heating amount control means executes the heating amount control operation. When the hunting state in which the high temperature side set amount higher than the set amount and the low temperature side set amount lower than the target hot water temperature are alternately repeated appears more than the set number of times, the control constant is set appropriately. It is configured to determine that there is no.

That is, when the hunting state exceeds the set number of times as described above, it is determined that the control is unstable and the time until it converges to the target hot water temperature is longer than the proper time. You can do it.

According to a fourth aspect of the present invention, the heating amount control means has a deviation between a target water outlet temperature and a water inlet temperature of water flowing through the heating means detected by the water inlet temperature detecting means. Calculating the feedforward control amount of the heating amount based on the water flow rate of the water flowing through the heating means detected by the water flow rate detecting means and the control constant for the feedforward control, and detecting hot water. The feedback control amount is calculated based on the deviation between the temperature and the target hot water temperature and the control constant for feedback control, and the feedforward control amount and the feedback control amount are added to obtain the target heating amount.

In the determining means, the heating amount control means starts the control operation of the heating amount, and when the temperature of the heated hot water is rising, the detected hot water temperature becomes the target hot water temperature or a set temperature close to it. Based on the elapsed time up to, it will be determined whether or not the control constant for the feedforward control amount is properly set.

That is, when controlling the heating operation of the heating means, the feedforward control is executed on the basis of the information on the incoming water temperature, the target hot water temperature, and the water flow rate, which can be obtained in advance, so that the response of the heating means can be improved. The characteristics can be improved, and the feedback control based on the information on the detected output temperature, which is the output information of the heating means, can reduce the steady-state deviation due to the feedforward control and accurately achieve the target hot water temperature. Therefore, since the elapsed time until the detected hot water temperature reaches the target hot water temperature or the set temperature close to the target hot water temperature corresponds to the response characteristic of the heating means, the control constant for the feedforward control amount is set to an appropriate value by this elapsed time. It is possible to determine whether or not

According to the fifth aspect of the present invention, when it is determined that the control constant is not properly set, the correction means increases the control constant by the set amount according to the response change characteristic. Either the correction is performed or the correction is performed by reducing the setting amount.

Therefore, by repeatedly performing such correction operation of the control constant a plurality of times, it becomes possible to change to an appropriate control state having a more appropriate response change characteristic. For example, the response change characteristic When correction is performed with a correction amount of a different size depending on the above, since it is correction information based on the transitional change characteristics, it is not always set to an appropriate value, and a steady error may occur. Although there is a possibility of occurrence, such a disadvantage can be avoided in advance according to this configuration.

According to a sixth aspect of the present invention, there is provided abnormality processing means for executing processing for abnormality when the control constant exceeds a set upper limit value or falls below a set lower limit value. Therefore, when it is necessary to set the control constant to an abnormally large value that exceeds the set upper limit value or an abnormally small value that falls below the set lower limit value, the control operation by the heating amount control means cannot execute proper control. Since it is in an abnormal state, by executing the process for abnormality, it is possible to avoid the disadvantage that the heating control is erroneously continued in such an abnormal state.

According to the seventh aspect of the present invention, since the nonvolatile storage means for storing the control constants is provided, for example, when a temporary non-power supply state such as a power failure occurs. However, it becomes possible to store and hold the corrected information regarding the proper control constants, and the proper heating amount control can be performed even when the power supply is restored after the non-power supply state as described above occurs. You will be able to continue.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A hot water supply control device according to the present invention will be described below. A hot water supply control device is shown in FIG. 1. This device supplies a hot water supply part A as a hot water supply means for performing a hot water supply operation, a control part H for controlling the operation of the hot water supply part A, and commands operation information to the control part H. The remote control operation unit R and the like are provided.

The hot water supply unit A is provided with a heat exchanger 2 for heating water and a gas combustion type burner 3 for heating the heat exchanger 2 in the combustion chamber 1, and the inside of the combustion chamber 1 is provided. A fan 4 is provided as a ventilation means for ventilating the combustion air of the burner 3 therethrough. The heat exchanger 2 is connected to a water inlet path 5 to which water is supplied and a hot water outlet path 6 to supply hot water after heating to a hot water tap (not shown). A water flow rate sensor 7 as a water flow rate detecting means for detecting and a water temperature control thermistor 8 as a water temperature detecting means for detecting a water temperature are provided.
An outlet hot water temperature thermistor 9 is provided as outlet hot water temperature detecting means for detecting the hot water temperature after being heated by the heat exchanger 2.

The fuel supply passage 10 for the burner 3 is provided with two electromagnetically operated on-off valves 11 and 12 and an electromagnetically operated fuel adjustment valve 13 capable of changing and adjusting the fuel supply amount. An igniter 14 for freely igniting the burner 3 and a frame rod 15 for detecting an ignition state are provided near the burner 3.

The remote controller operating unit R is connected to the control unit H by wire communication so that it can be operated by a switch 16 for instructing start / stop of the hot water supply unit A and a target for setting a target hot water temperature in the hot water supply unit A. A temperature setting switch 17 as a temperature setting means, a temperature display section 18 for displaying the hot water supply temperature and the like, a combustion display lamp 19 for displaying the combustion state of the burner 3, an abnormality display lamp 20 for displaying an abnormal state as will be described later, and the like. Is configured.

The control section H comprises a microcomputer, and has a water flow rate sensor 7, an incoming water temperature thermistor 8, an outlet hot water temperature thermistor 9, each on-off valve 11, 12, a fuel adjusting valve 13, an igniter 14, and a frame rod 15. , The fans 4 are connected to each other. Then, the hot water supply operation of the hot water supply unit A is controlled based on the operation information from the remote control operation unit R. That is, the operation switch 1
When 6 is turned on and the detection value of the water flow sensor 7 exceeds the set water amount in accordance with the opening operation of the hot water tap, each on-off valve 11, 12 and the fuel adjustment valve 13 are opened, and the igniter 14 is opened. The ignition operation is started to start the ignition operation for the burner 3. After that, the target heating amount of the burner 3, specifically, the fuel supply amount is calculated so that the detected hot water temperature detected by the hot water temperature thermistor 9 becomes the target hot water temperature.
The fuel adjustment valve 13 so that the calculated fuel supply amount is achieved.
In addition to controlling the air flow rate, the air flow rate of the fan 4 is controlled so as to obtain an appropriate air flow rate according to the combustion amount. When the hot water tap is closed and the water flow rate falls below the set water flow rate, the burner 3
To stop the combustion of.

More specifically, the control unit H determines the target heating amount based on the detection information of the incoming water temperature thermistor 8, the outgoing hot water temperature thermistor 9, the water flow rate sensor 7, the target outgoing hot water temperature, and the like. , A heating amount control means 100 for controlling the operation of the fuel adjusting valve 13 so that the heating amount of the burner 3 becomes the target heating amount, and as the heating amount control means 100 executes the heating amount control operation. Then, based on the response change characteristic of the detected hot water temperature, it is determined whether or not the control constant for calculating the target heating amount based on the deviation in the heating amount control means 100 is set appropriately. Discriminating means 101, and when the discriminating means 101 discriminates that the control constant is not properly set, the correcting means 102 corrects the control constant according to the response change characteristic. When serial control constant is below or setting a lower limit value exceeds the set upper limit value, the abnormality processing unit 103 for executing the processing for abnormality, each of is provided in the control program format.

To add further explanation, the heating amount control means 100, as shown in the following [Equation 1], allows the incoming water temperature Ti detected by the incoming water temperature thermistor 8 and the target hot water outlet temperature set by the temperature setting switch 17 to be set. Based on the deviation from Ts, the water flow rate Qo detected by the water flow rate sensor 7, and the control constant K for feedforward control, the feedforward control amount FF of the heating amount is calculated, and the following [Equation 2 ], The feedback control amount is calculated on the basis of the deviation between the detected hot water temperature To detected by the hot water temperature thermistor 9 and the target hot water temperature Ts and the control constants K _P and K _I for feedback control. As shown in [Equation 3], the feedforward control amount and the feedback control amount are added to obtain the target fuel supply amount Ip as the target heating amount. It is configured to. The control constants for feedback control include the control constant K _P in the proportional term and the control constant K _I in the integral term.

[0028]

FF = K (Ts-Ti) Qo

[0029]

FB = K _P (Ts−To) + K _I ∫ (Ts−To) dt

[0030]

[Number 3] Ip = FF + FB = K ( Ts-Ti) Qo + K P (Ts-To) + K I ∫
(Ts-To) dt

That is, the feedforward control amount FF is calculated based on the water flow rate and the deviation between the water inlet temperature Ti and the target hot water discharge temperature Ts which is obtained in advance when the water flow is started. The heating amount of the burner 3 can be controlled as quickly as possible without using the temperature information.
Can be controlled to the amount of heat required to obtain In addition, by obtaining the feedback control amount FB based on the deviation between the detected hot water temperature detection information and the target hot water temperature Ts, the steady-state deviation can be reduced and the hot water discharge temperature can be accurately made the target hot water temperature Ts.

The discriminating means 101 is constructed to discriminate whether or not each control constant is properly set based on the following various response change characteristics of the detected hot water temperature. (B) When the heating amount control means 100 executes the control operation of the heating amount, the detected hot water temperature To is detected.
However, the superheat state duration time in which the superheat state higher than the target hot water temperature Ts by the set amount is continued. (B) When the heating amount control means 100 executes the control operation of the heating amount, the detected hot water temperature To is detected.
Whether or not the hunting state in which the state higher than the target hot water temperature Ts by the set amount on the high temperature side and the state lower than the target hot water temperature Ts by the set amount on the low temperature side are alternately repeated exceeds the set number of times. (C) The heating amount control means 100 starts the control operation of the heating amount, and when the temperature of the heated hot water is rising, the detected hot water temperature To is set to the target hot water temperature Ts or a set temperature close thereto. Elapsed time to become.

When it is determined that the control constant is not properly set, the correcting means 102 increases the control constant by a set amount or decreases it by a set amount according to the response change characteristic. It is configured to correct.

When the control constant exceeds the set upper limit value or falls below the set lower limit value, the abnormality processing means 103 turns on the abnormality display lamp 20 as processing for abnormality,
Notifying the user that an abnormality has occurred, and controlling to an interlock state in which the combustion operation of the burner 3 is restrained regardless of the operation information of the remote control operation unit R until a maintenance switch (not shown) is operated. Is configured.

Further, the control section H is provided with a non-volatile memory 21 as a storage means for storing the control constants. The memory 21 is composed of an electrically non-volatile storage element (EEPROM) that is electrically writable and erasable, and can retain its stored contents even in a temporary non-powered state such as a power failure. It has become.

The control operation of the control unit H will be described below with reference to FIG.
This will be described based on the control flow chart shown in FIG. 3 and the change state of the outlet heated water temperature shown in FIG. When the operation switch 16 is turned on and the detected water flow rate Qo exceeds the set water flow rate Qs due to the opening operation of the hot water tap, the ignition operation is executed (steps 1, 2, 3). That is, each on-off valve 11, 12
Is opened, the fuel adjustment valve 13 is opened so that the fuel supply amount for ignition is adjusted, and the ignition operation by the igniter 14 is started. When ignition is confirmed by the frame rod 15, the ignition operation is stopped. . Next, the control constant previously stored in the memory 21 is read (step 4), and based on the control constant and the detection information of the thermistors 8 and 9 and the water flow rate sensor 7, the target fuel supply amount Ip is set as described above.
Is calculated (step 5). Then, the fuel adjustment valve 1 is adjusted so that the fuel supply amount to the burner 3 becomes the target fuel supply amount Ip.
Combustion control is executed to control the air flow rate of the fan 4 so as to control the air flow rate corresponding to the combustion quantity (step 6).

Then, as will be described later, each timer for measuring various operation times is reset, and the state determination flag is cleared (step 7). For example,
Based on whether or not the deviation between the detected hot water temperature To and the target hot water temperature Ts is equal to or more than a set amount, it is determined whether or not it is the first ignition operation that has been long since the previous combustion was stopped. (Step 8) If it is the first ignition operation, the response change characteristic of the detected hot water temperature To is detected. That is, the rising elapsed time t ₁ until the detected hot water temperature To reaches a temperature lower than the target hot water temperature Ts by the set amount (2 ° C) is counted by the first timer (steps 9 and 10), and the temperature is set to the above temperature. When it reaches, the data of the first timer is held (step 11). Further, within 30 seconds after the hot water supply is started, the detected hot water temperature To is higher than the target hot water temperature Ts by a set amount (2 ° C) or more, which is an overheat state (overshoot). The continuing time t ₂ of the overheated state is counted by the second timer (step 12,
13, 14). Further, the detected hot water temperature To is the target hot water temperature T
When the temperature becomes lower than s by a set amount (2 ° C.) or more, a flag is set (steps 15 and 16).

The detected hot water temperature To is higher than the target hot water temperature Ts by the set amount (1 ° C.) within 30 seconds after the hot water supply is started and after 60 seconds have passed.
In the above high state, the detected hot water temperature To is equal to the target hot water temperature Ts.
If a so-called hunting state in which a state lower than the set temperature (1 ° C) on the low temperature side alternately appears, the number of times of hunting is counted (steps 17, 18,
19). In this way, various information regarding the response change characteristics of the detected hot water temperature To is detected.

Thereafter, the hot water tap is closed and the detected water flow rate Q
o falls below the set water volume Qs, and combustion of the burner 3 is stopped.
Then (steps 20 and 21), the first point in step 8 above
If it is determined that it is a fire action, correct the control constant.
Control is executed (step 22). That is, the first timer
Rise time t counted in₁40 seconds
For a long time that exceeds
The state is constant, and the control constant K of the feedforward control amount is
Is not set properly, and its feed
Increase the control constant K of the forward control amount by the set amount ΔK.
(Steps 23 and 24). Also, the elapsed time to rise
t₁Is not over 40 seconds but over 30 seconds
Control of the proportional term in the feedback control amount
Constant K_pSet amount ΔK _p(Step 2
5, 26). Rise time t₁Over 30 seconds
Even if not, it will be counted by the second timer
Overheated state elapsed time t_TwoIf is over 10 seconds, stand
Rise response is too sensitive and feed forward
The control constant K of the mode control amount is not set properly
And the control constant K of the feedforward control amount
Is decreased by the set amount ΔK (steps 27 and 28).
Also, the overtemperature state elapsed time t_TwoIs less than 10 seconds,
The time is not "0 seconds" and an overshoot is detected
If the flag is set, the fee
Control constant K of the proportional term in the feedback control amount_PThe set amount
ΔK_PAnd reduce the feedback control amount
Control constant K of the integral term in_ISet amount ΔK_IOnly increased
(Steps 29, 30, 31). Also, the flag is
When it is not set, the feedback control amount is
Control constant K of the integral term_ISet amount ΔK_IOnly reduced
(Step 32).

Even if the overheated state elapsed time t ₂ is not detected and the overshoot does not appear, if the count value of the hunting number is not less than the set number (3 times), hunting is suppressed. Therefore, the control constant K _P of the proportional term in the feedback control amount is set to the set amount ΔK _P
And the control constant K _I of the integral term in the feedback control amount is decreased by the set amount ΔK _I (steps 33 and 34).

Then, in the state where the correction control of each control constant is executed as described above, the control constant exceeds the allowable limit range, that is, exceeds the set upper limit value or falls below the set lower limit value. If it is determined that the abnormality has occurred, the abnormality display lamp 20 in the remote control operation unit R is turned on to notify the user of the abnormality (steps 35 and 36), the combustion of the burner 3 is stopped, and after that, the remote control operation unit R is stopped.
Executes an interlock that restrains the combustion operation of the burner 3 regardless of the operation (step 3).
7). This interlock is maintained, for example, until a maintenance switch (not shown) provided inside the water heater body is operated (step 38).

If the control constant is within the allowable limit, the corrected correction constants are written and stored in the non-volatile memory 21 when the operation switch 16 is turned off (steps 39 and 40).

Since the control as described above is executed every time the hot water supply operation is executed, each control constant is more appropriate according to the response change characteristic of the detected hot water temperature To every time the repeated control is executed. The value is appropriately corrected to a proper value and converges to the most appropriate state.

[Other Embodiments] (1) In the above embodiment, the case where the rising elapsed time t ₁ , the overheated state elapsed time t ₂ , and the number of times of hunting are used as the response change characteristics of the detected hot water temperature is exemplified. In addition to these, as shown in FIG. 4, an overshoot amount ΔT1 (difference between target hot water temperature and high temperature side peak temperature), undershoot amount ΔT2 (difference between target hot water temperature and low temperature side peak temperature), etc. May be used, all of these pieces of information may be used, or only a part of the information may be used for correction.

(2) In the above embodiment, the condition of each response change characteristic of the detected hot water temperature is judged separately, and the control constants corresponding thereto are appropriately corrected.
For example, fuzzy control theory, neural network control theory, or the like may be used to perform control that comprehensively determines the optimum correction information based on a plurality of information.

(3) In the above embodiment, the heating amount is calculated by adding the feedforward control amount and the feedback control amount, but the present invention is not limited to such a configuration. Feedback control may be performed by so-called PID control based on the deviation from the temperature.

(4) In the above-mentioned embodiment, the abnormality processing lamp is turned on and the interlock is executed as the abnormality processing means. However, an alarm sound may be generated in addition to the lamp display. Further, the interlock may not be executed and only the notification operation may be executed.

(5) In the above embodiment, the corrected control constant is stored in the non-volatile storage means.
Instead of such a configuration, only the initial setting value may be stored in a non-volatile memory, and the correction information may be stored in another volatile memory. Further, the non-volatile storage means may be an EEPROM. Instead, it may be a floppy disk or other magnetic storage medium.

(6) In the above embodiment, as the correction means, the control constant is increased or decreased by the set amount each time the hot water supply operation is executed. However, based on the response change characteristics of the detected hot water temperature, An appropriate correction amount may be obtained, for example, the correction operation may be performed only when instructed by a maintenance switch or the like.

In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram

FIG. 2 is a flowchart of a control operation.

FIG. 3 is a flowchart of a control operation.

FIG. 4 is a diagram showing a change state of tapping temperature.

[Explanation of symbols]

 7 Water Flow Rate Detection Means 8 Inlet Water Temperature Detection Means 9 Hot Water Temperature Detection Means 17 Target Temperature Setting Means 21 Storage Means 100 Heating Amount Control Means 101 Discriminating Means 102 Correcting Means 103 Abnormal Processing Means A Hot Water Supply Means

Claims (7)

[Claims] 1. A hot water supply means (A) for heating the water supplied by flowing through to supply hot water, and a hot water supply temperature detection means (9) for detecting the temperature of hot water discharged from the hot water supply means (A), A target temperature setting means (17) for setting a target hot water temperature in the hot water supply means (A), a target hot water temperature detected by the hot water temperature detecting means (9), and a target based on a deviation between the target hot water temperature. A hot water supply control device comprising: a heating amount control means (100) for calculating a heating amount and controlling the heating amount in the hot water supply means (A) to be the target heating amount. When the control operation of the heating amount by the amount control means (100) is executed, the target heating is performed based on the deviation in the heating amount control means (100) based on the response change characteristic of the detected hot water temperature. Calculate amount When the control constant for determining whether the control constant is properly set or not, and when the control constant is determined not to be properly set by the determining means (101), the control is performed. A hot water supply control apparatus comprising: a correction unit (102) that corrects a constant according to the response change characteristic. 2. The determination means (101), when the heating amount control means (100) executes the control operation of the heating amount, the detected hot water temperature is
The control unit is configured to determine whether or not a control constant is properly set based on an overheated state duration time in which an overheated state higher than the target hot water temperature by a set amount or more is continued. Hot water supply controller. 3. The detection means (101), when the control operation of the heating amount is executed by the heating amount control means (100), the detected hot water temperature,
A state in which the target hot water temperature is higher than the target hot water temperature by a preset amount,
When a hunting state in which a state lower than the target hot water temperature by a preset amount or more is alternately repeated exceeds the set number of times, it is determined that the control constant is not properly set. The hot water supply control device according to claim 1. 4. An incoming water temperature detecting means (8) for detecting the temperature of water flowing and supplied to the hot water supplying means (A), and a flowing water temperature detecting means for detecting the amount of water flowing through and supplied to the hot water supplying means (A). Water amount detection means (7) is provided, and the heating amount control means (100) detects the deviation between the water temperature detected by the water temperature detection means (8) and the target hot water temperature, and the water flow amount detection. A feedforward control amount of the heating amount is calculated based on the water flow rate detected by the means (7) and a control constant for feedforward control, and a deviation between the detected hot water temperature and the target hot water temperature, as well as,
The feedback control amount is calculated based on a control constant for feedback control, the feedforward control amount and the feedback control amount are added, and the target heating amount is obtained. The heating amount control means (100) starts the control operation of the heating amount, and when the temperature of the tapping water is rising, the detected tapping temperature becomes the target tapping temperature or a set temperature close thereto. The hot water supply control device according to claim 1, 2 or 3, wherein it is configured to determine whether or not the control constant for the feedforward control amount is properly set based on the elapsed time until. 5. The correcting means (102) increases the control constant by a set amount according to the response change characteristic when it is determined that the control constant is not properly set, or The hot water supply control device according to claim 1, wherein the hot water supply control device is configured to perform correction by reducing the set amount. 6. An abnormality processing means (103) is provided for executing processing for abnormality when the control constant exceeds a set upper limit value or falls below a set lower limit value.
Hot water supply control device described. 7. A non-volatile storage means (21) for storing the control constant is provided.
Hot water supply control device according to 5 or 6.