JP7694589B2 - Water heater - Google Patents

Description

This disclosure relates to a water heater.

Patent Document 1 discloses a water heater. In this water heater, a sealed housing is provided in a bathroom, and a temperature sensor is provided inside the housing. In general, there may be a difference in actual temperature between the inside of the housing and the inside of the bathroom. In this water heater, a fixed correction value is applied to the measured temperature, which is the reading of the temperature sensor, so that the ambient temperature inside the bathroom can be easily detected.

JP 2018-119773 A

When the temperature inside the bathroom changes, the temperature inside the housing changes with a certain time delay after the temperature inside the bathroom changes. However, in the water heater described in Patent Document 1, the fixed correction value is a value that is determined based on the distance between the heat source inside the housing and the temperature sensor. Therefore, when the temperature inside the bathroom changes, the water heater cannot quickly detect the temperature corresponding to the change.

The present disclosure has been made to solve the above-mentioned problems. The purpose of the present disclosure is to provide a water heater that can quickly use a corrected temperature value that reflects changes in the temperature inside the bathroom, using a temperature sensor installed inside a sealed housing.

The water heater of the present disclosure comprises a sealed casing installed inside a bathroom, a temperature sensor provided inside the sealed casing, and a control device that controls at least one of the bathroom environment and the hot water supply to the bath, and the control device has a change amount calculation unit that calculates a correction change amount of the temperature measured by the temperature sensor at a specified target time, a correction value calculation unit that calculates a correction value so that the absolute value of the correction value becomes larger as the absolute value of the correction change amount becomes larger, a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a correction temperature value for the bathroom, and an operation control unit that uses the correction temperature value to control at least one of the bathroom environment and the hot water supply to the bath , and the correction value calculation unit calculates the product of the correction change amount and a specified correction coefficient as the correction value .
In addition, the water heater of the present disclosure comprises a sealed casing installed inside a bathroom, a temperature sensor provided inside the sealed casing, and a control device that controls at least one of the bathroom environment and the hot water supply to the bath, and the control device comprises a change amount calculation unit that calculates a correction change amount of the temperature measured by the temperature sensor at a specified target time, a correction value calculation unit that calculates a correction value so that the absolute value of the correction value becomes larger as the absolute value of the correction change amount becomes larger, a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a correction temperature value for the bathroom, an operation control unit that uses the correction temperature value to control at least one of the bathroom environment and the hot water supply to the bath, and a time change unit that calculates a first change amount of the temperature measured by the temperature sensor at a specified comparison time and changes the length of the target time based on the first change amount, and the time change unit shortens the target time as the absolute value of the first change amount becomes larger.
In addition, the water heater of the present disclosure comprises a sealed casing installed inside a bathroom, a temperature sensor provided inside the sealed casing, and a control device that controls at least one of the bathroom environment and the hot water supply to the bath, and the control device comprises a change amount calculation unit that calculates a correction change amount of the temperature measured by the temperature sensor at a specified target time, a correction value calculation unit that calculates a correction value so that the absolute value of the correction value increases as the absolute value of the correction change amount increases, a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a correction temperature value for the bathroom, an operation control unit that uses the correction temperature value to control at least one of the bathroom environment and the hot water supply to the bath, and a time change unit that changes the target time to the time from a base time until the change in the temperature measured by the temperature sensor becomes a second change amount.
In addition, the water heater of the present disclosure comprises a sealed casing installed inside a bathroom, a temperature sensor provided inside the sealed casing, and a control device that controls at least one of the bathroom environment and the hot water supply to the bath, and the control device comprises a change amount calculation unit that calculates a correction change amount of the temperature measured by the temperature sensor at a specified target time, a correction value calculation unit that calculates a correction value so that the absolute value of the correction value becomes larger as the absolute value of the correction change amount becomes larger, a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a correction temperature value for the bathroom, and an operation control unit that uses the correction temperature value to control at least one of the bathroom environment and the hot water supply to the bath, and if the absolute value of the correction value is greater than or equal to a first invalid threshold, the operation control unit does not use the correction temperature value for control until the first invalid time has elapsed after the correction value is calculated.
In addition, the water heater of the present disclosure comprises a sealed casing installed inside a bathroom, a temperature sensor provided inside the sealed casing, and a control device that controls at least one of the bathroom environment and the hot water supply to the bath, and the control device comprises a change amount calculation unit that calculates a correction change amount of the temperature measured by the temperature sensor at a specified target time, a correction value calculation unit that calculates a correction value so that the absolute value of the correction value becomes larger as the absolute value of the correction change amount becomes larger, a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a correction temperature value for the bathroom, and an operation control unit that uses the correction temperature value to control at least one of the bathroom environment and the hot water supply to the bath, and if the absolute value of the correction change amount is greater than or equal to a second invalid threshold, the operation control unit does not use the correction temperature value for control until the second invalid time has elapsed since the correction change amount was calculated.
In addition, the water heater of the present disclosure comprises a sealed casing installed inside a bathroom, a temperature sensor provided inside the sealed casing, and a control device that controls at least one of the bathroom environment and the hot water supply to the bath, and the control device comprises a change amount calculation unit that calculates a correction change amount of the temperature measured by the temperature sensor at a specified target time, a correction value calculation unit that calculates a correction value so that the absolute value of the correction value increases as the absolute value of the correction change amount increases, a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a correction temperature value for the bathroom, and an operation control unit that uses the correction temperature value to control at least one of the bathroom environment and the hot water supply to the bath, and if the correction temperature value is not within the expected temperature range, the operation control unit does not use the correction temperature value for control.
In addition, the water heater of the present disclosure comprises a sealed casing installed inside a bathroom, a temperature sensor provided inside the sealed casing, a control device that controls at least one of the bathroom environment and the hot water supply to the bath, and a display that displays information, wherein the control device comprises a change amount calculation unit that calculates a correction change amount of the temperature measured by the temperature sensor at a specified target time, a correction value calculation unit that calculates a correction value such that the absolute value of the correction value becomes larger as the absolute value of the correction change amount becomes larger, a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a correction temperature value for the bathroom, an operation control unit that controls at least one of the bathroom environment and the hot water supply to the bath using the correction temperature value, and a display control unit that displays the correction temperature value calculated by the temperature calculation unit on the display, and when the absolute value of the correction change amount is smaller than a third invalid threshold, the display control unit displays the correction temperature value on the display in a first manner, and when the absolute value of the correction change amount is equal to or greater than the third invalid threshold, the display control unit displays the correction temperature value on the display in a second manner different from the first manner.

According to the present disclosure, a temperature sensor installed inside a sealed housing can be used to quickly obtain a corrected temperature value that reflects changes in temperature inside the bathroom.

1 is a schematic diagram of a residence to which a water heater in a first embodiment is applied. 2 is a cross-sectional view of a sealed housing of the water heater according to the first embodiment. FIG. FIG. 2 is a functional block diagram of the water heater according to the first embodiment. 4 is a flowchart for explaining an overview of the operation of the control device for the water heater in the first embodiment. FIG. 11 is a functional block diagram of a water heater in a second embodiment.

The embodiments for implementing the present disclosure will be described with reference to the attached drawings. Note that in each drawing, the same or corresponding parts are given the same reference numerals. Duplicate descriptions of the parts will be appropriately simplified or omitted.

Embodiment 1.
Fig. 1 is a schematic diagram of a house to which a water heater in accordance with embodiment 1 is applied. Fig. 2 is a cross-sectional view of a sealed housing of the water heater in accordance with embodiment 1.

The water heater 1 shown in FIG. 1 is installed in a residence 100. The water heater 1 supplies hot water from faucets and the like installed in places such as the kitchen, washroom, and bathroom 101 of the residence 100. The water heater 1 also supplies hot water to a bathtub installed in the bathroom 101 of the residence 100. As an example, the water heater 1 is a storage-type water heater that supplies hot water stored in a hot water storage tank. The water heater 1 includes a hot water supply unit 2, a control device 3, a bathroom interface 4, and an outside bathroom interface 5. The water heater 1 may further include a bathroom heater 6.

The hot water supply unit 2 generates hot water from a water source and sends the hot water with the temperature adjusted to a faucet or the like. For example, if the water heater 1 is a storage type water heater, the water heater unit 2 includes a heat pump device that generates hot water, a hot water storage tank that stores hot water, piping that connects each device so that hot water can flow, and an actuator such as a pump. The control device 3 controls at least one of the environment of the bathroom 101 and the hot water supply to the bath by controlling the entire water heater 1. The control device 3 is provided with a processing circuit having a processor and memory. Each function of the control device 3 is realized by the processor processing a program stored in the memory. In order to realize each function, the control device 3 may also use dedicated hardware.

As shown in FIG. 2, the bathroom interface 4 is attached to the bathroom wall 102 of the bathroom 101. The bathroom interface 4 is attached to the surface of the bathroom wall 102 facing the interior of the bathroom 101. That is, at least a portion of the surface of the bathroom interface 4 facing the bathroom 101 is attached facing the interior of the bathroom 101 and exposed to the air inside the bathroom 101. The bathroom interface 4 has a sealed housing 4a, a substrate 4b, a display 4c, and a temperature sensor 4d.

The sealed housing 4a forms the outer shell of the bathroom interface 4. If moisture, water, etc., enters the inside of the sealed housing 4a, electronic devices, etc. may break down. Therefore, the sealed housing 4a is formed so that the inside is sealed. In addition, the sealed housing 4a may have small holes, etc., in order to suppress internal pressure fluctuations and to pass wiring to the outside. However, even if small holes, etc. are provided, the sealed housing 4a is considered to be in a "sealed state inside". In other words, the "sealed state inside" does not only mean a state in which the internal space of the bathroom 101, which is the external space of the sealed housing 4a, is completely blocked from the internal space of the sealed housing 4a, but also a state in which there are small holes or gaps on the surface of the sealed housing 4a, but heat exchange due to the movement of gas between the inside and outside of the sealed housing 4a is not sufficiently performed. The overall heat transfer from the outside to the inside of the sealed housing 4a is achieved by heat transfer from the fluid, including air, in the external space to the components of the sealed housing 4a, and then heat transfer from the components of the sealed housing 4a to the air inside. For example, if the temperature inside the bathroom 101 rises, the temperature inside the sealed housing 4a rises as it is heated by the air in the bathroom 101 through the components of the sealed housing 4a. For this reason, the structure of the sealed housing 4a is such that it takes time for the temperature of the inside air to follow a change in the temperature of the outside air.

The board 4b is provided inside the sealed housing 4a. The board 4b is capable of communicating with the control device 3. For example, the board 4b accepts operations from an operation button (not shown) provided on the bathroom interface 4, and transmits a signal indicating the operation content to the control device 3. The display 4c is a display. The display 4c is controlled by the board 4b to display information such as hot water settings on the screen.

The temperature sensor 4d is provided inside the sealed housing 4a. For example, the temperature sensor 4d is a sensor such as a thermocouple or a thermistor connected to the substrate 4b. The temperature sensor 4d is preferably provided in a position close to the outer periphery of the sealed housing 4a and away from the heat-generating components contained in the sealed housing 4a. The temperature sensor 4d measures the temperature of the air inside the sealed housing 4a in order to obtain the temperature of the internal space of the bathroom 101.

The outside bathroom interface 5 is provided in a space of the residence 100 other than the bathroom 101, such as a kitchen or hallway (not shown). The outside bathroom interface 5 has a display 5a. Information such as hot water settings is displayed on the display 5a. Although not shown, the outside bathroom interface 5 is provided with a speaker that issues audio notifications.

When the water heater 1 is equipped with the bathroom heater 6, the bathroom heater 6 is provided in the bathroom 101. For example, the bathroom heater 6 generates hot air and blows it into the bathroom 101 to adjust the air temperature in the bathroom 101. The operation of the bathroom heater 6 may be controlled by the control device 3, or may be controlled by another controller that obtains the temperature inside the bathroom 101 from the control device 3.

The temperature measured by the temperature sensor 4d is used by the control device 3 for various controls. For example, if the temperature inside the bathroom 101 is too low, the control device 3 issues an alert via the outside bathroom interface 5 to warn the user that the temperature in the bathroom 101 is low, or to suggest opening the bathtub lid to raise the temperature in the bathroom 101. In this case, the control device 3 may also issue an alert suggesting that the temperature of the hot water in the bathtub be raised above a set value, taking into account the heat transferred to the air in the bathroom 101. If the water heater 1 is equipped with a bathroom heater 6, the bathroom heater 6 is controlled based on the temperature measured by the temperature sensor 4d.

For example, in winter, a user opens the lid of the bathtub before taking a bath to raise the temperature inside the bathroom 101, and checks the temperature of the bathroom 101 displayed on the display 5a before taking a bath. However, because the temperature sensor 4d measures the temperature inside the sealed housing 4a, the actual temperature of the air in the bathroom 101 and the temperature measured by the temperature sensor 4d often differ. If the temperature measured by the temperature sensor 4d were directly regarded as the temperature of the bathroom 101, the temperature inside the sealed housing 4a would change with a delay from the temperature change inside the bathroom 101, and an acquisition error would occur in each control by the amount of the delay. Therefore, the time until the user can take a bath may be delayed. In this embodiment, the control device 3 creates a correction value based on the measured temperature of the temperature sensor 4d, and calculates the corrected temperature value using the measured temperature and the correction value. The control device 3 uses the corrected temperature value for various controls, such as displaying the corrected temperature value on the display 5a.

Next, the control device 3 will be described with reference to FIG. 3 and FIG.
Fig. 3 is a functional block diagram of the water heater in embodiment 1. Fig. 4 is a flow chart for explaining an outline of the operation of the control device for the water heater in embodiment 1.

As shown in FIG. 3, the control device 3 has, as its functions, a temperature acquisition unit 31, a change amount calculation unit 32, a correction value calculation unit 33, a temperature calculation unit 34, an operation control unit 35, and a display control unit 36.

The temperature acquisition unit 31 acquires information on the measured temperature measured by the temperature sensor 4d. For example, the temperature acquisition unit 31 acquires information on the measured temperature from the temperature sensor 4d at a specified time interval, such as 0.5 seconds. The change amount calculation unit 32 calculates a correction change amount, which is the amount by which the measured temperature has changed during the passage of the target time, for each specified target time as the correction change amount. The correction value calculation unit 33 calculates a correction value for correcting the measured temperature based on the correction change amount. For example, the correction value calculation unit 33 calculates a correction value for each target time. The temperature calculation unit 34 calculates the sum of the measured temperature and the correction value as the corrected measured temperature, and sets it as the corrected temperature value. The operation control unit 35 uses the correction temperature value to perform various controls related to the control of the temperature of the hot water in the bathtub, the operation of the bathroom heater 6, etc. The display control unit 36 controls the information displayed on the display unit 4c and the display unit 5a. Specifically, for example, the display control unit 36 causes the display unit 4c and the display unit 5a to display the calculated correction temperature value.

Due to the nature of heat transfer, the greater the temperature difference between the inside of the sealed housing 4a and the inside of the bathroom 101, the greater the amount of change in the temperature inside the sealed housing 4a per unit time. In other words, the greater the absolute value of the correction change amount, the greater the absolute value of the temperature value to be corrected for the measured temperature at a certain point in time.

The correction value calculation unit 33 therefore calculates the correction value so that the greater the absolute value of the correction change amount, the greater the absolute value of the correction value. For example, when the temperature of the bathroom 101 is rising and the correction change amount is positive, the calculation is performed so that the greater the correction change amount, the greater the positive correction value. For example, when the temperature of the bathroom 101 is falling and the correction change amount is negative, the calculation is performed so that the smaller the correction change amount, the smaller the negative correction value. Specifically, when calculating the first correction value when the absolute value of the correction change amount is greater than the first correction threshold, the correction value calculation unit 33 calculates the first correction value so that the absolute value of the first correction value is greater than the absolute value of the second correction value. Here, the second correction value is the correction value calculated when the absolute value of the correction change amount is equal to or less than the first correction threshold.

As an example of a specific calculation method of the correction value, the correction value calculation unit 33 calculates the product of the correction change amount and a specified correction coefficient as the correction value. The correction coefficient is set in advance for each bathroom interface 4. The correction coefficient is a number that reflects the difficulty of heat transfer between the air inside the bathroom 101 and the air inside the sealed housing 4a. The correction coefficient may be determined to be a larger value as the heat transfer becomes more difficult. The correction coefficient is determined by the material of the member that constitutes the outer shell of the sealed housing 4a, the position where the temperature sensor 4d is provided inside the sealed housing 4a, etc. For example, the correction coefficient may be determined by setting a temperature difference between the internal temperature and the external temperature of a device simulating the bathroom interface 4 and conducting an experiment to compare the internal temperature and the external temperature. Note that the correction value calculation unit 33 may calculate the correction value from the correction change amount using not only a function in which the correction value is proportional to the correction change amount, but also a function in which the correction value increases monotonically with respect to the correction change amount in any correction change amount or in the target value range.

For example, the flowchart shown in FIG. 4 starts after the correction change amount is calculated. In step S1, the temperature acquisition unit 31 of the control device 3 acquires information on the measured temperature from the temperature sensor 4d.

Then, in step S2, the change amount calculation unit 32 determines whether the target time has elapsed since the time when the previous correction change amount was calculated. If the target time has not elapsed in step S2, the operations from step S1 onwards are performed.

If the target time has elapsed in step S2, the operation of step S3 is performed. In step S3, the change amount calculation unit 32 calculates the correction change amount.

Then, in step S4, the correction value calculation unit 33 calculates a correction value based on the correction change amount. Then, in step S5, the temperature calculation unit 34 calculates a correction temperature value based on the measured temperature and the correction value. Then, in step S6, the operation control unit 35 and the display control unit 36 of the control device 3 use the correction temperature value for various controls. For example, in step S6, the display unit 4c and the display unit 5a display the correction temperature value as the temperature of the bathroom 101. Then, the operation of the flowchart ends.

In addition, in step S6, if a specified invalid condition is met, the control device 3 may not use the correction temperature value for various controls at all times or until a specified time has elapsed. In this case, the control device 3 may continue the previous control content while not using the correction temperature value for various controls. In other words, the control device 3 may use the correction temperature value that was used until just before for the current control. Alternatively, if an invalid condition is met, the control device 3 may use the measured temperature value for control instead of the correction temperature value.

As a first example of operation based on an invalid condition, when the absolute value of the correction value is equal to or greater than a specified first invalid value, the operation control unit 35 does not use the correction temperature value for control until a specified first invalid time has elapsed since the correction value was calculated. For example, the first invalid time may be set to a time equal to or greater than the target time. The first invalid time may be set to a time not exceeding twice the target time.

As a second example of operation based on an invalid condition, when the absolute value of the correction change amount is equal to or greater than the second invalid threshold, the operation control unit 35 does not use the correction temperature value for control until a specified second invalid time has elapsed since the correction change amount was calculated. For example, the second invalid time may be set to the same time as the first invalid time.

As a third example of operation based on an invalid condition, if the corrected temperature value is not included in the specified expected temperature range, the operation control unit 35 does not use the corrected temperature value for control. The expected temperature range is the temperature range expected as the temperature inside the bathroom 101. For example, the expected temperature range is from minus 10°C to plus 50°C.

In step S6, the manner in which the corrected temperature value is displayed on the display 4c and the display 5a may differ depending on whether the absolute value of the correction change amount is smaller than the specified caution threshold value or equal to or greater than the caution threshold value. It is expected that the smaller the absolute value of the temperature change amount, the closer the corrected temperature value is to the actual temperature inside the bathroom 101. In this way, it is possible to inform the user whether the displayed corrected temperature value is reliable or not.

For example, when the absolute value of the correction change amount is smaller than the attention threshold, the display control unit 36 displays the correction temperature value on the display 4c and the display 5a in a first manner. When the absolute value of the correction change amount is equal to or greater than the attention threshold, the display control unit 36 displays the correction temperature value on the display 4c and the display 5a in a second manner. It is preferable that the first and second manners are related to each other. For example, the display 4c and the display 5a may display the word "Determined Value" near the correction temperature value as the first manner, and the word "Estimated Value" near the correction temperature value as the second manner. For example, the display 4c and the display 5a may display the correction temperature value as a continuously lit value as the first manner, and the correction temperature value as a flashing value as the second manner.

According to the above-described embodiment 1, the water heater 1 includes a sealed housing 4a, a temperature sensor 4d, and a control device 3. The control device 3 includes a change amount calculation unit 32, a correction value calculation unit 33, a temperature calculation unit 34, and an operation control unit 35. In the control device 3, a correction value is calculated so that the absolute value of the correction value increases as the absolute value of the correction amount of change increases, and a correction temperature value is calculated based on the correction value. For example, if the temperature of the bathroom 101 rises suddenly and the difference between the temperature inside the bathroom 101 and the temperature inside the sealed housing 4a increases, the temperature inside the sealed housing 4a changes significantly in a short period of time. The control device 3 regards such a change amount inside the sealed housing 4a as the temperature difference between the inside of the bathroom 101 and the inside of the sealed housing 4a at the current time, that is, the temperature difference to be corrected, and calculates the correction temperature value. At this time, the water heater 1 does not use the values of sensors other than the temperature sensor 4d. Therefore, the water heater 1 can quickly use the correction temperature value that reflects the change in the temperature inside the bathroom 101 using only the temperature sensor 4d. As a result, the water heater 1 can use the temperature inside the bathroom 101 with a simple configuration that accurately takes into account the effect of measurement delays due to temperature rise.

The correction value calculation unit 33 also calculates the product of the correction change amount and the correction coefficient as the correction value. This allows the correction value to be calculated with a small calculation load.

In addition, the operation control unit 35 may not use the corrected temperature value for control when the absolute value of the correction value is equal to or greater than the first invalid threshold value. When the absolute value of the correction value is large, the difference between the temperature inside the bathroom 101 and the temperature inside the sealed housing 4a is large, and the correction accuracy is likely to deteriorate. In order to not use the corrected temperature value for control in such cases, the water heater 1 can suppress the use of temperatures with large errors.

The operation control unit 35 may also be configured not to use the correction temperature value for control when the absolute value of the correction change amount is equal to or greater than the second invalid threshold. When the absolute value of the correction change amount is large, the difference between the temperature inside the bathroom 101 and the temperature inside the sealed housing 4a is large, and the correction accuracy is likely to deteriorate. In order to avoid using the correction temperature value for control in such cases, the water heater 1 can suppress the use of temperatures with large errors.

The operation control unit 35 may also be configured not to use the corrected temperature value for control if the corrected temperature value is not included in the expected temperature range. The expected temperature range is set so that values that are not included in the expected temperature range are clearly abnormal values. This makes it possible to prevent the calculated corrected temperature value from affecting other functions when the temperature sensor 4d is abnormal due to a malfunction of the temperature sensor 4d, disturbance due to sunlight, disturbance due to pouring hot water, etc., or when the correction change amount is abnormal.

The water heater 1 also includes at least one of a display 4c and a display 5a. The at least one display displays the corrected temperature value. This allows the user to quantitatively know the current temperature inside the bathroom 101. For example, if the user intends to preheat the inside of the bathroom 101 before taking a bath in winter, the user can decide the timing to start bathing by referring to the corrected temperature value displayed on the display 5a. Compared to a case where temperature correction is not performed, the corrected temperature value takes into account the temperature change inside the bathroom 101, so the user can know that the bathroom 101 has warmed up earlier by the amount of the correction value, which is the delay correction.

In addition, the correction temperature value is displayed in different ways on the display 4c and the display 5a depending on the magnitude of the absolute value of the correction change amount. This allows the user to easily grasp the accuracy of the displayed correction temperature value.

The technical means disclosed herein can be applied to a water heater 1 that is not a storage type. In addition, at least one of the functions included in the control device 3 may be provided in the bathroom interface 4.

Embodiment 2.
Fig. 5 is a functional block diagram of a water heater according to embodiment 2. Note that the same or corresponding parts as those in embodiment 1 are denoted by the same reference numerals, and the description of these parts is omitted.

As shown in FIG. 5, in the second embodiment, the control device 3 further includes a time change unit 40 as a function. The time change unit 40 changes the length of the target time based on the amount of change in the measured temperature. The time change unit 40 may change the length of the target time at any timing. The time change unit 40 satisfies at least one of the conditions that the length of the target time after the change is equal to or less than the maximum time and the condition that the length is equal to or greater than the minimum time. As an example, the maximum time is set to 10 minutes. The minimum time is set to 10 seconds. In this case, the time change unit 40 changes the length of the target time so that the changed target time is equal to or greater than 10 seconds and equal to or less than 10 minutes. The change amount calculation unit 32 calculates the correction change amount using the changed target time.

As a first example of a method for changing the target time, the time change unit 40 shortens the judgment time as the absolute value of the first amount of change in the measured temperature during the specified comparison time increases. In other words, the time change unit 40 lengthens the judgment time as the absolute value of the first amount of change decreases. Specifically, when the absolute value of the first amount of change is greater than the specified first correction threshold, the time change unit 40 sets the changed target time to a time shorter than the preset target time. When the absolute value of the first amount of change is smaller than the specified second correction threshold, the time change unit 40 sets the changed target time to a time longer than the preset target time. The comparison time may be shorter than the target time or may be the same as the target time.

As a second example of a method for changing the target time, the time change unit 40 sets the target time to the time from the base time until the absolute value of the change in the measured temperature becomes the second change amount. In this case, the control device 3 calculates the correction value and the corrected temperature value each time the absolute value of the measured temperature changes by the second change amount. For example, the base time may be set to the time when the corrected temperature value was previously calculated. The second change amount may be set to any value.

According to the second embodiment described above, the control device 3 further includes a time change unit 40. The time change unit 40 may change the length of the target time so that the target time becomes shorter as the absolute value of the first change amount becomes larger. Therefore, when the temperature change per unit time in the bathroom 101 is large, the water heater 1 can improve the trackability of the corrected temperature value to the actual temperature inside the bathroom 101 by increasing the number of corrections per unit time. Furthermore, when the temperature change per unit time in the bathroom 101 is small, the water heater 1 can reduce the calculation load by reducing the number of corrections per unit time.

The time change unit 40 may also change the target time to the time from the base time until the amount of change in the measured temperature becomes the second amount of change. Therefore, when the temperature change per unit time in the bathroom 101 is large, the water heater 1 can improve the trackability of the corrected temperature value to the actual temperature inside the bathroom 101 by increasing the number of corrections per unit time. When the temperature change per unit time in the bathroom 101 is small, the water heater 1 can reduce the calculation load by decreasing the number of corrections per unit time.

The time change unit 40 may accept a setting change to the value of the second change amount at any timing. For example, the setting change may be made by the user via the bathroom interface 4 or the outside bathroom interface 5. In this case, the smaller the value of the second change amount, the better the tracking of the correction temperature value to the actual temperature change in the bathroom 101. On the other hand, in this case, the influence of measurement noise on the correction change amount becomes greater, causing the correction temperature value to fluctuate frequently. The larger the value of the second change amount, the worse the tracking. On the other hand, in this case, fluctuations in the correction temperature value are less likely to occur. By accepting a setting change to the second change amount, it becomes possible to set the trade-off between such tracking ability and tolerance to fluctuations according to the user's usage experience.

To summarize the above explanation, possible configurations of the technology according to the present disclosure include the configurations listed below as appendices.
(Appendix 1)
A sealed housing installed inside the bathroom;
A temperature sensor provided inside the sealed housing;
A control device for controlling at least one of the bathroom environment and the hot water supply to the bath;
Equipped with
The control device includes:
a change amount calculation unit that calculates a correction change amount of the measured temperature of the temperature sensor at a specified target time;
a correction value calculation unit that calculates the correction value such that the absolute value of the correction value increases as the absolute value of the correction change amount increases;
a temperature calculation unit that calculates the sum of the correction change amount and the correction value as a corrected temperature value of the bathroom;
an operation control unit that controls at least one of the environment of the bathroom and the supply of hot water to the bath using the corrected temperature value;
A water heater having the above structure.
(Appendix 2)
The water heater according to claim 1, wherein the correction value calculation unit calculates a product of the correction change amount and a specified correction coefficient as the correction value.
(Appendix 3)
The control device includes:
a time changing unit that calculates a first change amount of the temperature measured by the temperature sensor during a specified comparison time, and changes the length of the target time based on the first change amount;
Further comprising:
The water heater according to claim 1 or 2, wherein the time change unit shortens the target time as the absolute value of the first amount of change increases.
(Appendix 4)
The control device includes:
a time change unit that changes the target time to a time from a base time until an amount of change in the temperature measured by the temperature sensor becomes a second amount of change;
The water heater according to claim 1 or 2, further comprising:
(Appendix 5)
A water heater as described in any one of Appendix 1 or Appendix 4, wherein, when the absolute value of the correction value is equal to or greater than a first invalid threshold, the operation control unit does not use the correction temperature value for control until a first invalid time has elapsed since the correction value was calculated.
(Appendix 6)
A water heater as described in either Appendix 1 or Appendix 4, wherein when the absolute value of the correction change amount is equal to or greater than a second invalid threshold, the operation control unit does not use the correction temperature value for control until a second invalid time has elapsed since the correction change amount was calculated.
(Appendix 7)
The water heater according to any one of claims 1 to 4, wherein, when the correction temperature value is not included in an expected temperature range, the operation control unit does not use the correction temperature value for control.
(Appendix 8)
A display that displays information;
Further comprising:
The control device includes:
a display control unit that causes the display device to display the corrected temperature value calculated by the temperature calculation unit;
The water heater according to any one of claims 1 to 7, further comprising:
(Appendix 9)
The display control unit is
When the absolute value of the correction change amount is smaller than a third invalid threshold value, the correction temperature value is displayed on the display in a first manner;
A water heater as described in Appendix 8, in which, when the absolute value of the correction change amount is equal to or greater than the third invalid threshold value, the correction temperature value is displayed on the display in a second manner different from the first manner.

1 Water heater, 2 Water heater unit, 3 Control device, 4 Bathroom interface, 4a Sealed housing, 4b Board, 4c Display, 4d Temperature sensor, 5 Outside bathroom interface, 5a Display, 6 Bathroom heater, 31 Temperature acquisition unit, 32 Change amount calculation unit, 33 Correction value calculation unit, 34 Temperature calculation unit, 35 Operation control unit, 36 Display control unit, 40 Time change unit, 100 Residence, 101 Bathroom, 102 Bathroom wall

Claims (8)

A sealed housing installed inside the bathroom;
A temperature sensor provided inside the sealed housing;
A control device for controlling at least one of the bathroom environment and the hot water supply to the bath;
Equipped with
The control device includes:
a change amount calculation unit that calculates a correction change amount of the measured temperature of the temperature sensor at a specified target time;
a correction value calculation unit that calculates the correction value such that the absolute value of the correction value increases as the absolute value of the correction change amount increases;
a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a corrected temperature value of the bathroom;
an operation control unit that controls at least one of the environment of the bathroom and the supply of hot water to the bath using the corrected temperature value;
having
The correction value calculation unit calculates the product of the correction change amount and a specified correction coefficient as the correction value . A sealed housing installed inside the bathroom;
A temperature sensor provided inside the sealed housing;
A control device for controlling at least one of the bathroom environment and the hot water supply to the bath;
Equipped with
The control device includes:
a change amount calculation unit that calculates a correction change amount of the measured temperature of the temperature sensor at a specified target time;
a correction value calculation unit that calculates the correction value such that the absolute value of the correction value increases as the absolute value of the correction change amount increases;
a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a corrected temperature value of the bathroom;
an operation control unit that controls at least one of the environment of the bathroom and the supply of hot water to the bath using the corrected temperature value;
a time change unit that calculates a first change amount of the temperature measured by the temperature sensor during a specified comparison time and changes the length of the target time based on the first change amount ;
Equipped with
The water heater, wherein the time change unit shortens the target time as the absolute value of the first amount of change increases. A sealed housing installed inside the bathroom;
A temperature sensor provided inside the sealed housing;
A control device for controlling at least one of the bathroom environment and the hot water supply to the bath;
Equipped with
The control device includes:
a change amount calculation unit that calculates a correction change amount of the measured temperature of the temperature sensor at a specified target time;
a correction value calculation unit that calculates the correction value such that the absolute value of the correction value increases as the absolute value of the correction change amount increases;
a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a corrected temperature value of the bathroom;
an operation control unit that controls at least one of the environment of the bathroom and the supply of hot water to the bath using the corrected temperature value;
a time change unit that changes the target time to a time from a base time until an amount of change in the temperature measured by the temperature sensor becomes a second amount of change;
A water heater equipped with . A sealed housing installed inside the bathroom;
A temperature sensor provided inside the sealed housing;
A control device for controlling at least one of the bathroom environment and the hot water supply to the bath;
Equipped with
The control device includes:
a change amount calculation unit that calculates a correction change amount of the measured temperature of the temperature sensor at a specified target time;
a correction value calculation unit that calculates the correction value such that the absolute value of the correction value increases as the absolute value of the correction change amount increases;
a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a corrected temperature value of the bathroom;
an operation control unit that controls at least one of the environment of the bathroom and the supply of hot water to the bath using the corrected temperature value;
Equipped with
When the absolute value of the correction value is equal to or greater than a first invalid threshold, the operation control unit does not use the correction temperature value for control until a first invalid time has elapsed since the correction value was calculated. A sealed housing installed inside the bathroom;
A temperature sensor provided inside the sealed housing;
A control device for controlling at least one of the bathroom environment and the hot water supply to the bath;
Equipped with
The control device includes:
a change amount calculation unit that calculates a correction change amount of the measured temperature of the temperature sensor at a specified target time;
a correction value calculation unit that calculates the correction value such that the absolute value of the correction value increases as the absolute value of the correction change amount increases;
a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a corrected temperature value of the bathroom;
an operation control unit that controls at least one of the environment of the bathroom and the supply of hot water to the bath using the corrected temperature value;
Equipped with
When the absolute value of the correction change amount is equal to or greater than a second invalid threshold, the operation control unit does not use the correction temperature value for control until a second invalid time has elapsed since the correction change amount was calculated. A sealed housing installed inside the bathroom;
A temperature sensor provided inside the sealed housing;
A control device for controlling at least one of the bathroom environment and the hot water supply to the bath;
Equipped with
The control device includes:
a change amount calculation unit that calculates a correction change amount of the measured temperature of the temperature sensor at a specified target time;
a correction value calculation unit that calculates the correction value such that the absolute value of the correction value increases as the absolute value of the correction change amount increases;
a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a corrected temperature value of the bathroom;
an operation control unit that controls at least one of the environment of the bathroom and the supply of hot water to the bath using the corrected temperature value;
Equipped with
When the correction temperature value is not included in an expected temperature range, the operation control unit does not use the correction temperature value for control. A display that displays information;
Further comprising:
The control device includes:
a display control unit that causes the display device to display the corrected temperature value calculated by the temperature calculation unit;
The water heater according to any one of claims 1 to 6, further comprising: A sealed housing installed inside the bathroom;
A temperature sensor provided inside the sealed housing;
A control device for controlling at least one of the bathroom environment and the hot water supply to the bath;
A display for displaying information;
Equipped with
The control device includes:
a change amount calculation unit that calculates a correction change amount of the measured temperature of the temperature sensor at a specified target time;
a correction value calculation unit that calculates the correction value such that the absolute value of the correction value increases as the absolute value of the correction change amount increases;
a temperature calculation unit that calculates the sum of the temperature measured by the temperature sensor and the correction value as a corrected temperature value of the bathroom;
an operation control unit that controls at least one of the environment of the bathroom and the supply of hot water to the bath using the corrected temperature value;
a display control unit that causes the display device to display the corrected temperature value calculated by the temperature calculation unit;
Equipped with
The display control unit is
When the absolute value of the correction change amount is smaller than a third invalid threshold value, the correction temperature value is displayed on the display in a first manner;
When the absolute value of the correction change amount is equal to or greater than the third invalid threshold value, the water heater causes the display device to display the correction temperature value in a second manner different from the first manner.

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