JP2021155946A - Sanitary washing device - Google Patents

Abstract

To provide a sanitary washing device capable of accurately determining the abnormality of a temperature sensor.SOLUTION: The sanitary washing device includes a hot water storage tank, a nozzle, a water supply/stop part, a heater, a first temperature sensor, a second temperature sensor, and a determination part. The water supply/stop part selects washing water to be supplied to the nozzle or stopped The heater heats the washing water in the hot water storage tank. The first temperature sensor for measuring the temperature of the washing water in the hot water storage tank uses a measurement value for on/off control of the heater. The second temperature sensor for measuring the temperature of washing water in the hot water storage tank uses a measurement value for determining whether the temperature of the washing water in the hot water storage tank is a predetermined temperature or higher, or not. The determination part determines the abnormality of the second temperature sensor on the basis of the measurement value of the second temperature sensor measured when the washing water to the nozzle is stopped by the water supply/stop part and a preset measurement value measured by a given temperature sensor.SELECTED DRAWING: Figure 6

Description

The disclosed embodiment relates to a sanitary cleaning device.

Conventionally, a sanitary cleaning device that discharges hot water to a local part of the human body is known (see, for example, Patent Document 1). In such a sanitary cleaning device, the temperature of the cleaning water measured by the temperature sensor is higher than a predetermined temperature in order to prevent the excessively heated high-temperature cleaning water from being discharged from the nozzle. In some cases, the discharge of wash water from the nozzle is prohibited.

Japanese Patent No. 6284070

However, in the above-mentioned conventional technique, the temperature sensor may deteriorate over time, for example, due to long-term use of the sanitary cleaning device (for example, 5 to 10 years). If the temperature sensor becomes abnormal due to deterioration over time, it may be difficult to properly control the temperature of the water discharged to the human body. Therefore, a technique for accurately determining an abnormality of a temperature sensor has been desired.

One aspect of the embodiment is to provide a sanitary cleaning device capable of accurately determining an abnormality of a temperature sensor.

The sanitary cleaning device according to one embodiment includes a hot water storage tank for storing wash water, a nozzle for discharging the wash water in the hot water storage tank toward a local part of the human body, and a water supply for the wash water supplied to the nozzle. The first is to measure the temperature of the water supply / stop unit that switches between water stoppage, the heater that heats the wash water in the hot water storage tank, and the wash water in the hot water storage tank, and the measured value is used for on / off control of the heater. A second temperature sensor that measures the temperature of the washing water in the hot water storage tank and the measured value is used to determine whether or not the temperature of the washing water in the hot water storage tank is equal to or higher than a predetermined temperature, and the supply stop. Based on the measured value of the second temperature sensor measured when the washing water to the nozzle is stopped by the water unit and the measured value measured by a preset predetermined temperature sensor, the first 2. It is characterized by including a determination unit for determining an abnormality of the temperature sensor.

This makes it possible to measure the measured value of the second temperature sensor at the timing when the temperature of the washing water in the hot water storage tank is stable. By using such a measured value of the second temperature sensor, it is possible to accurately determine the abnormality of the second temperature sensor.

Conversely, for example, in the case where the washing water is supplied to the nozzle, the washing water in the hot water storage tank is agitated because the washing water is being discharged from the hot water storage tank. Therefore, the temperature of the washing water in the hot water storage tank is not stable and varies. For example, if the determination unit measures the measured value of the second temperature sensor at the timing when the temperature of the washing water in the hot water storage tank fluctuates, and if such a measured value is used, an abnormality of the second temperature sensor is erroneously determined. It may be easier. However, since the determination unit is configured as described above, it is difficult to erroneously determine the abnormality of the second temperature sensor, and the abnormality of the second temperature sensor can be accurately determined.

Further, the determination unit includes the measured value of the second temperature sensor measured when the heater is turned off and the washing water to the nozzle is stopped by the water supply / stop unit, and the predetermined value. It is characterized in that the abnormality determination of the second temperature sensor is performed based on the measured value measured by the temperature sensor.

This makes it possible to measure the measured value of the second temperature sensor at the timing when the temperature of the washing water in the hot water storage tank is more stable, and by using such measured value, the abnormality of the second temperature sensor can be detected. The judgment can be made more accurately. That is, when the heater is turned on, the washing water in the hot water storage tank is agitated by convection. Therefore, the temperature of the washing water in the hot water storage tank is not stable and varies, which may make it easy to erroneously determine an abnormality of the second temperature sensor. However, since the determination unit measures the measured value of the second temperature sensor with the heater turned off as described above, it is difficult to erroneously determine the abnormality of the second temperature sensor, and the abnormality of the second temperature sensor. Can be determined more accurately.

Further, the predetermined temperature sensor is the first temperature sensor, and when the difference between the measured value of the second temperature sensor and the measured value of the first temperature sensor is larger than the threshold value, the determination unit determines the second temperature sensor. It is characterized in that the temperature sensor determines that it is abnormal.

In this way, by using the difference between the measured value of the second temperature sensor and the measured value of the first temperature sensor, the abnormality of the second temperature sensor can be determined more accurately.

Further, the first temperature sensor and the second temperature sensor are arranged so that at least a part of each other overlaps with each other in the vertical direction.

As a result, the first temperature sensor and the second temperature sensor are arranged in the hot water storage tank under the environment of the same temperature change, so that the measurement result (measured value) of the washing water is the same under normal conditions. .. Therefore, for example, when an abnormality occurs in the second temperature sensor, a difference is likely to occur between the measured value of the first temperature sensor and the measured value of the second temperature sensor, and the measured value of the first temperature sensor and the second temperature sensor are likely to be different. By using the measured value of, it is possible to accurately and early determine the abnormality of the second temperature sensor.

Further, the determination unit is characterized in that the abnormality determination of the second temperature sensor is performed at predetermined time intervals.

In this way, the determination unit can suppress the erroneous determination of the abnormality of the second temperature sensor by periodically performing the abnormality determination of the second temperature sensor. In addition, the number of times of abnormality determination processing can be relatively reduced, and thus the processing load of the determination unit can be reduced.

Further, when the determination unit determines that the second temperature sensor is abnormal, the heater control unit is provided to prohibit the heating of the washing water by the heater.

This makes it possible to prevent the high-temperature washing water from being discharged from the nozzle when the second temperature sensor is abnormal. Further, since the cleaning water can be discharged from the nozzle, the sanitary cleaning device can be continuously used.

Further, when the determination unit determines that the second temperature sensor is abnormal, the water supply control unit for prohibiting the supply of wash water to the nozzle is provided.

This makes it possible to prevent the high-temperature washing water from being discharged from the nozzle when the second temperature sensor is abnormal.

According to one aspect of the embodiment, in the sanitary cleaning device, the abnormality of the temperature sensor can be accurately determined.

FIG. 1 is a perspective view schematically showing a toilet device provided with the sanitary cleaning device according to the embodiment. FIG. 2 is a block diagram showing an example of the configuration of the sanitary cleaning device according to the embodiment. FIG. 3 is an explanatory diagram of the hot water storage tank. FIG. 4 is an explanatory diagram of temperature drift. FIG. 5 is an explanatory diagram for explaining the abnormality determination of the limit thermistor. FIG. 6 is an explanatory diagram for explaining the abnormality determination of the limit thermistor. FIG. 7 is a flowchart showing a processing procedure executed by the control unit.

Hereinafter, embodiments of the sanitary cleaning apparatus disclosed in the present application will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments shown below.

<Overview of toilet equipment>
First, an outline of the toilet device provided with the sanitary cleaning device according to the embodiment will be described with reference to FIG. FIG. 1 is a perspective view schematically showing a toilet device provided with the sanitary cleaning device according to the embodiment.

For convenience of explanation, FIG. 1 shows a three-dimensional Cartesian coordinate system including the Z axis whose positive direction is vertically upward (upward), and the positive direction of the X axis is to the right and the negative direction of the X axis is to the left. The positive direction of the Y-axis is defined as the front, and the negative direction of the Y-axis is defined as the rear. Therefore, in the following, the X-axis direction may be referred to as the left-right direction, the Y-axis direction may be referred to as the front-back direction, and the Z-axis direction may be referred to as the up-down direction. In addition, the expressions "washing water" and "water" below do not necessarily mean cold water, but may be used to include hot water.

As shown in FIG. 1, the toilet device 10 is installed in the toilet room 1. The toilet device 10 includes a Western-style toilet bowl (hereinafter referred to as a toilet bowl) 11, a tank 12, and a sanitary cleaning device 20.

The toilet bowl 11 is made of pottery, for example. The toilet bowl 11 may be made of resin or may be manufactured by combining pottery and resin. Further, in the illustrated example, the toilet bowl 11 is a so-called floor-standing type that is installed on the floor surface of the toilet room 1, but may be a so-called wall-mounted type that is installed on the wall surface of the toilet room 1.

The tank 12 is installed at the rear of the upper surface of the toilet bowl 11. The tank 12 stores toilet flush water for supplying to a bowl portion (not shown) that receives filth in the toilet bowl 11. As described above, the toilet device 10 is a so-called tank type in which the bowl portion of the toilet bowl 11 is washed with the toilet bowl washing water stored in the tank 12.

The toilet device 10 is not limited to the tank type, for example, a tap water direct pressure type that directly uses the water supply pressure of tap water, a flush valve type, and a flush water that uses the supplementary pressure of the pump. It may be something to supply.

The sanitary cleaning device 20 is installed on the upper surface of the toilet bowl 11, for example, in front of the tank 12. The sanitary cleaning device 20 includes a main body 21, a toilet lid 22, and a toilet seat (not shown). Both the toilet lid 22 and the toilet seat are attached to the main body 21 so as to be openable and closable. The main body 21 includes a case 23. The case 23 accommodates a nozzle 90 (see FIG. 2) and the like, which will be described later.

<Configuration of sanitary cleaning equipment>
Next, the configuration of the sanitary cleaning device 20 according to the embodiment will be described with reference to FIG. FIG. 2 is a block diagram showing an example of the configuration of the sanitary cleaning device 20 according to the embodiment. As shown in FIG. 2, the sanitary cleaning device 20 includes a water supply channel 30, a valve unit 40, a hot water storage tank 50, a heater 51, an electrolytic cell unit 60, a vacuum breaker 70, a switching valve 80, and a nozzle 90. And.

The sanitary cleaning device 20 includes temperature sensors 101 and 102. Hereinafter, the temperature sensor 101 may be referred to as a “first temperature sensor 101”, and the temperature sensor 102 may be referred to as a “second temperature sensor 102”.

Further, the sanitary cleaning device 20 includes a control unit 200 and a storage unit 210. The water supply channel 30, the valve unit 40, the hot water storage tank 50, the electrolytic cell unit 60, the vacuum breaker 70, the switching valve 80, the nozzle 90, the control unit 200, and the storage unit 210 are arranged in the case 23 (see FIG. 1). The heater (heating element) 51 and the first and second temperature sensors 101 and 102 are arranged in the hot water storage tank 50.

The water supply channel 30 connects the water supply source A to the nozzle 90. The water supply source A is, for example, a water pipe. Water (washing water) supplied from the water supply source A flows through the water supply channel 30. Further, in the water supply channel 30, a valve unit 40, a hot water storage tank 50, an electrolytic cell unit 60, a vacuum breaker 70, and a switching valve 80 are arranged in this order from the upstream side (water supply source A side).

The valve unit 40 is driven in response to a control signal output from the control unit 200 to open and close the water supply channel 30. For example, the valve unit 40 is provided with a solenoid valve and can be opened and closed in response to the above-mentioned control signal to switch between supplying and stopping the washing water supplied to the nozzle 90. The valve unit 40 is an example of the water supply / stop unit.

The hot water storage tank 50 stores wash water. The washing water stored in the hot water storage tank 50 is heated by the heater 51, and the temperature is measured by the first and second temperature sensors 101 and 102. The hot water storage tank 50 will be described later with reference to FIG.

The electrolytic cell unit 60 includes, for example, an anode plate and a cathode plate in the electrolytic cell. The electrolytic cell unit 60 is driven in response to a control signal output from the control unit 200, and electrolyzes the washing water flowing in the electrolytic cell to generate washing water containing hypochlorous acid (also referred to as functional water). Generate.

In the vacuum breaker 70, when a negative pressure is generated in the water supply channel 30, the washing water flowing back in the water supply channel 30 flows back to the air opening path (not shown), so that the washing water flows back from the nozzle 90 to the hot water storage tank 50 or the like. Prevent from doing.

The switching valve 80 is driven in response to a control signal output from the control unit 200 to switch the outflow destination of the washing water flowing through the water supply channel 30. For example, the switching valve 80 switches the outflow destination of the washing water flowing through the water supply channel 30 to any of a plurality of spouts (not shown) included in the nozzle 90. Further, for example, the switching valve 80 switches the outflow destination of the cleaning water (for example, functional water) flowing through the water supply channel 30 to the nozzle cleaning flow path 85. The cleaning water flowing through the nozzle cleaning flow path 85 is discharged toward the surface of the nozzle 90 for cleaning the nozzle 90.

The nozzle 90 discharges the washing water in the hot water storage tank 50 toward the local part (human body local part) of the user seated on the toilet seat. The nozzle 90 is configured to be able to move forward and backward with respect to the case 23. Specifically, a drive source such as a motor (not shown) is connected to the nozzle 90, and the nozzle 90 is retracted into the bowl portion of the toilet bowl 11 and retracted into the case 23 by the drive of the motor. It is advanced and retreated to and from the position where it is made. The nozzle 90 discharges cleaning water toward the local part of the user at the advanced position to wash the local part.

The first temperature sensor 101 and the second temperature sensor 102 measure the temperature of the washing water in the hot water storage tank 50 as described above.

The first temperature sensor 101 is a hot water thermistor. The measurement result (hereinafter, referred to as the measured value or the resistance value) by the first temperature sensor (hereinafter, referred to as a hot water thermistor) 101 is used for the drive control of the heater 51, that is, the on / off control.

The second temperature sensor 102 is a limit thermistor. The second temperature sensor (hereinafter referred to as a limit thermistor) 102 is provided to confirm that the temperature of the washing water discharged from the nozzle 90 is, for example, a temperature safe for the human body. Therefore, the measurement result of the limit thermistor 102 (hereinafter, referred to as a measured value or a resistance value) is used for determining whether or not the temperature of the washing water in the hot water storage tank 50 is equal to or higher than a predetermined temperature. It is used to determine whether the temperature is high or not. In this way, the limit thermistor 102 functions as a safety device. The predetermined temperature is set to a relatively high temperature value that is not safe for the human body, for example, but is not limited to this and can be set to an arbitrary value.

The measured values of the hot water thermistor 101 and the limit thermistor 102 are output to the control unit 200. The measured values of the hot water thermistor 101 and the limit thermistor 102 are represented by, for example, digital values of 0 to 255 (hereinafter referred to as AD values). The control unit 200 converts the AD value output from the limit thermistor 102 or the like into a temperature using a conversion table stored in advance in the storage unit 210.

The control unit 200 is realized by, for example, executing a program stored in the storage unit 210 by a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or the like, using a RAM (Random Access Memory) as a work area. NS. The control unit 200 can also be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). The storage unit 210 has a volatile memory and a non-volatile memory, and is realized by, for example, a semiconductor memory element such as a RAM (Random Access Memory) or a flash memory (Flash Memory).

The control unit 200 includes a water supply control unit 201, a heater control unit 202, and a determination unit 203. The water supply control unit 201 outputs control signals to the valve unit 40, the electrolytic cell unit 60, the switching valve 80, and the like based on, for example, various input signals to control the operation. The water supply control unit 201 can execute the abnormality response process when the determination unit 203 determines that the limit thermistor 102 is abnormal, which will be described later.

The heater control unit 202 controls the heater 51 on and off based on the measured value of the hot water thermistor 101. For example, the heater control unit 202 can execute boiling control, heat retention control, and the like by controlling the heater 51 on and off.

In the boiling control, for example, when the washing water in the hot water storage tank 50 is cold water having a low water temperature, the temperature of the washing water in the hot water storage tank 50 is set to a preset target temperature C0 by controlling the heater 51 on. It is a control to heat the washing water in the hot water storage tank 50 until (see FIG. 5). The heat retention control is, for example, a control in which the temperature of the washing water in the hot water storage tank 50 is maintained at the target temperature C0 by controlling the heater 51 on and off after the boiling control.

The heater control unit 202 can execute the abnormality response process when the limit thermistor 102 is determined to be abnormal by the determination unit 203, which will be described later.

The heater control unit 202 determines that the temperature of the washing water in the hot water storage tank 50 exceeds a temperature safe for the human body when the measured value of the limit thermistor 102 is a high temperature equal to or higher than a predetermined temperature. In such a case, the heater control unit 202 stops the temperature control by the heater 51 and does not heat the washing water, in other words, prohibits the heating of the washing water by the heater 51.

The water supply control unit 201 controls the valve unit 40 to wash water instead of or in addition to prohibiting the heating of the washing water by the heater 51 described above when the temperature of the washing water in the hot water storage tank 50 is high. The discharge from the nozzle 90 may be forcibly stopped, in other words, the supply of the washing water to the nozzle 90 may be prohibited. In addition to such a soft configuration, a hard configuration may be used in which the solenoid valve of the valve unit 40 is closed via a circuit (for example, a comparator circuit).

The determination unit 203 determines an abnormality of the limit thermistor (second temperature sensor) 102. Specifically, it is determined whether or not an abnormality has occurred in the limit thermistor 102. The abnormality determination of the limit thermistor 102 by the determination unit 203 will be described later with reference to FIGS. 5 and 6.

<Hot water storage tank>
Next, the hot water storage tank 50 will be described with reference to FIG. FIG. 3 is an explanatory view of the hot water storage tank 50 and is a schematic view of the hot water storage tank 50. As described above, the heater 51 and the temperature sensor (hot water thermistor 101 and limit thermistor 102) are arranged in the hot water storage tank 50.

As shown in FIG. 3, the hot water storage tank 50 includes an inflow port 52 and an outflow port 53. The inflow port 52 allows the washing water to flow into the hot water storage tank 50 from the upstream side of the hot water storage tank 50. The inflow port 52 is formed below the hot water storage tank 50. The outflow port 53 causes the washing water to flow out from the inside of the hot water storage tank 50 to the downstream side of the hot water storage tank 50. The outflow port 53 is formed above the hot water storage tank 50, in other words, is formed above the inflow port 52 in the hot water storage tank 50.

The heater 51 is arranged at a position closer to the inlet 52 than the outlet 53. That is, the heater 51 is arranged below the hot water storage tank 50.

The hot water thermistor 101 and the limit thermistor 102 measure the temperature of the washing water as described above. In the hot water storage tank 50, the hot water thermistor 101 and the limit thermistor 102 are arranged so as to overlap each other in the vertical direction. Specifically, the limit thermistor 102 is arranged so as to overlap in the vertical direction with respect to the projection surface on which the hot water thermistor 101 is projected in the horizontal direction. In other words, the hot water thermistor 101 and the limit thermistor 102 are arranged so as to be at the same height in the hot water storage tank 50. For example, in the hot water thermistor 101 and the limit thermistor 102, the vertical separation distance D1 from the heater 51 to the hot water thermistor 101 and the vertical separation distance D2 from the heater 51 to the limit thermistor 102 are the same or substantially the same. Placed in.

In the above, the hot water thermistor 101 and the limit thermistor 102 are arranged so as to overlap each other in the vertical direction, but the present invention is not limited to this, and the hot water thermistor 101 and the limit thermistor 102 may be arranged so as to partially overlap each other. That is, the hot water thermistor 101 and the limit thermistor 102 may be arranged so that at least a part of them overlap each other in the vertical direction.

Further, the hot water thermistor 101 is arranged in the hot water storage tank 50 at a position closer to the inflow port 52 than the limit thermistor 102. The limit thermistor 102 is arranged in the hot water storage tank 50 at a position closer to the outlet 53 than the hot water thermistor 101.

Here, when the washing water in the hot water storage tank 50 is heated by the heater 51, the temperature starts to rise from the vicinity of the inflow port 52 near the heater 51. As shown by the arrow W1, the heated wash water starts convection, and the temperature of the upper wash water in the hot water storage tank 50 gradually rises. That is, in the hot water storage tank 50, the temperature gradually rises from the lower side to the upper side of the hot water storage tank 50 while convection of the washing water is performed.

As described above, in the hot water storage tank 50, the environment of the temperature change of the washing water is different between the lower side and the upper side. Here, since the hot water thermistor 101 and the limit thermistor 102 are arranged so as to overlap each other in the vertical direction as described above, they are arranged in the hot water storage tank 50 under the same temperature change environment. Therefore, in the normal case, the hot water thermistor 101 and the limit thermistor 102 have similar measurement results (measured values) of the washing water. In the present embodiment, by using the measured values of the hot water thermistor 101 and the limit thermistor 102, the abnormality of the limit thermistor 102 can be accurately determined, which will be described later.

<About the abnormality of the limit thermistor>
Next, the abnormality of the temperature sensor including the limit thermistor 102 will be described. The limit thermistor 102 and the hot water thermistor 101 described above may deteriorate over time due to, for example, long-term use of the sanitary cleaning device 20, resulting in a phenomenon called temperature drift. This point will be described with reference to FIG. FIG. 4 is an explanatory diagram of temperature drift.

As described above, the control unit 200 converts the AD value input from the temperature sensor such as the limit thermistor 102 into the temperature using the conversion table stored in advance, thereby changing the temperature of the washing water in the hot water storage tank 50. It has recognized. For example, as illustrated in FIG. 4, when the AD value input from the temperature sensor (for example, the limit thermistor 102) is “80” at a certain time “t0”, the control unit 200 is stored in the storage unit 210. According to the conversion table, the temperature of the washing water at the place where the limit thermistor 102 is arranged is recognized as "45 ° C.".

However, when a temperature drift occurs in the limit thermistor 102, the limit thermistor 102 outputs an AD value "80" to the control unit 200 even though the actual water temperature is, for example, 50 ° C. In this case, the control unit 200 erroneously recognizes that the temperature of the washing water at the place where the limit thermistor 102 is arranged is "45 ° C" even though the actual water temperature is 50 ° C. As a result, water at 50 ° C., which is higher than the set temperature of 45 ° C., is discharged from the nozzle 90 to the human body.

In this way, the temperature drift is a phenomenon in which the temperature associated with the AD value output from the temperature sensor deviates from the actual temperature, specifically, the temperature shifts in the ascending direction or the descending direction as a whole. This is a phenomenon, and the temperature drift may make it difficult to properly control the temperature of the water discharged to the human body. Although the case where the AD value of the limit thermistor 102 shifts to the high temperature side has been described here, the AD value of the limit thermistor 102 may shift to the low temperature side due to the temperature drift.

Therefore, the sanitary cleaning device 20 according to the present embodiment is configured so that an abnormality of the limit thermistor 102, specifically, an abnormality due to temperature drift can be accurately determined. Hereinafter, such a configuration will be described in detail.

<Abnormality judgment processing of limit thermistor>
The abnormality determination process of the limit thermistor 102 will be described with reference to FIGS. 2, 5 and 6. 5 and 6 are explanatory views for explaining the abnormality determination of the limit thermistor 102. FIG. 5 is a timing chart showing the relationship between the on / off control of the heater 51 and the measured values V1 and V2 of the temperature sensors (hot water thermistor 101 and limit thermistor 102). FIG. 6 is a diagram showing the relationship between the measured value V1 of the hot water thermistor 101 and the measured value V2 of the limit thermistor 102 when an abnormality occurs due to temperature drift.

Before going into the description of the abnormality determination process of the limit thermistor 102, the above-mentioned boiling control and heat retention control will be described. In the example of FIG. 5, when the power is supplied to the sanitary cleaning device 20, the heater control unit 202 controls the heater 51 on and off based on the measured value V1 of the hot water thermistor 101.

For example, the heater control unit 202 turns on the heater 51 at time T1, that is, starts energizing the heater 51, and cleans the hot water storage tank 50 until the temperature of the washing water in the hot water storage tank 50 reaches the target temperature C0. It heats water, in other words, performs boiling control.

When the heater control unit 202 detects that the water temperature of the washing water gradually rises and the measured value V1 of the hot water thermistor 101 exceeds the target temperature C0 (time T2), the heater 51 is turned off, that is, the heater 51 is controlled. Stop energizing. The period from this time T1 to T2 is the period during which the boiling control is executed.

The heater control unit 202 can execute the heat retention control after the boiling control. For example, when the heater 51 is turned off at time T2, the washing water is naturally cooled and the water temperature gradually decreases. When the heater control unit 202 detects that the measured value V1 of the hot water thermistor 101 is lower than the preset lower limit temperature C1 lower than the target temperature C0 (time T6), the heater 51 is turned on, that is, the heater 51 is turned on. Is energized again. In this way, the heater control unit 202 repeats heating and cooling of the washing water so as to maintain (maintain) the temperature of the washing water in the hot water storage tank 50 at the target temperature C0. The period after the time T2 is the period during which the heat retention control is executed.

As described above, the hot water thermistor 101 and the limit thermistor 102 are arranged in the hot water storage tank 50 under the same temperature change environment. Therefore, as can be seen from FIG. 5, the thermistors 101 and 102 are normal. In some cases, the measurement result (measured value) of the same washing water is obtained.

Further, in the example of FIG. 5, at time T3, for example, the user gives an instruction to discharge the cleaning water from the nozzle 90, the solenoid valve of the valve unit 40 is opened, and the supply of the cleaning water to the nozzle 90 is started. It shall be. Further, at time T4, it is assumed that the user gives an instruction to stop the discharge of the washing water from the nozzle 90, the solenoid valve of the valve unit 40 is closed, and the washing water to the nozzle 90 is stopped.

In the sanitary cleaning device 20 as described above, the abnormality determination process of the limit thermistor 102 is performed. Specifically, the determination unit 203 (see FIG. 2) determines the abnormality of the limit thermistor 102.

For example, the determination unit 203 determines the abnormality of the limit thermistor 102 at the timing when the temperature of the washing water in the hot water storage tank 50 is stable. Specifically, the determination unit 203 determines the abnormality of the limit thermistor 102 at the timing when the cleaning water to the nozzle 90 is stopped by the valve unit 40. More specifically, the determination unit 203 sets the measured value E2 of the limit thermistor 102 measured when a predetermined time has elapsed since the washing water to the nozzle 90 was stopped (time T5 in the example of FIG. 5). , The abnormality of the limit thermistor 102 is determined based on the measured value E1 measured by the hot water thermistor 101. The hot water thermistor 101 is an example of a preset predetermined temperature sensor.

This makes it possible to measure the measured value E2 of the limit thermistor 102 and the measured value E1 of the hot water thermistor 101 at the timing when the temperature of the washing water in the hot water storage tank 50 is stable. By using the measured value E2 of the limit thermistor 102 and the measured value E1 of the hot water thermistor 101, it is possible to accurately determine the abnormality of the limit thermistor 102.

Conversely, for example, in the case where the washing water is supplied to the nozzle 90, the washing water in the hot water storage tank 50 is being agitated because the washing water is being discharged from the hot water storage tank 50. Therefore, the temperature of the washing water in the hot water storage tank 50 is not stable and varies. For example, tentatively, the determination unit 203 measures the measured value E2 of the limit thermistor 102 and the measured value E1 of the hot water thermistor 101 at the timing when the temperature of the washing water in the hot water storage tank 50 fluctuates, and the measured value E2 and the measured value are measured. When E1 is used, the abnormality of the limit thermistor 102 may be easily determined erroneously.

In the present embodiment, since the configuration is as described above, it is difficult to erroneously determine the abnormality of the limit thermistor 102, and the abnormality of the limit thermistor 102 can be accurately determined.

In the above description, the determination unit 203 determines the abnormality of the limit thermistor 102 when a predetermined time has elapsed after the washing water to the nozzle 90 is stopped, but the washing water to the nozzle 90 is stopped. At the same time, the limit thermistor 102 may be determined to be abnormal.

Further, the determination unit 203 measures the measured value E2 of the limit thermistor 102 and the measured value E1 of the hot water thermistor 101 when the heater 51 is turned off and the washing water to the nozzle 90 is stopped. , The abnormality determination of the limit thermistor 102 may be performed. Specifically, when the heater 51 is turned off, the boiling control is completed (completed), and the washing water to the nozzle 90 is stopped (more specifically, a predetermined time after the water is stopped). (When) has elapsed), the abnormality determination of the limit thermistor 102 may be performed.

This makes it possible to measure the measured value E2 of the limit thermista 102 and the measured value E1 of the hot water thermista 101 at the timing when the temperature of the washing water in the hot water storage tank 50 is more stable, and the measured values E2 and By using the measured value E1, the abnormality of the limit thermistor 102 can be determined more accurately.

That is, when the heater 51 is turned on, the washing water in the hot water storage tank 50 is agitated by convection. Therefore, the temperature of the washing water in the hot water storage tank 50 is not stable and varies, which may make it easy to erroneously determine the abnormality of the limit thermistor 102.

In the present embodiment, as described above, the measured value E2 of the limit thermistor 102 and the measured value E1 of the hot water thermistor 101 are measured with the heater 51 turned off, so that the limit thermistor 102 is abnormal. Is less likely to be erroneously determined, and the abnormality of the limit thermistor 102 can be determined more accurately.

Here, the abnormality determination of the limit thermistor 102 will be described in more detail with reference to FIG. As shown in FIG. 6, the measured value V1 of the hot water thermistor 101 and the measured value V2 of the limit thermistor 102 are relatively close values when the thermistors 101 and 102 are normal. Therefore, the difference between the measured value V1 of the hot water thermistor 101 and the measured value V2 of the limit thermistor 102 is equal to or less than the preset threshold value TH.

However, due to the long-term use of the sanitary cleaning device 20, the above-mentioned abnormality due to temperature drift may occur in the limit thermistor 102. When an abnormality occurs in the limit thermistor 102 due to temperature drift, the measured value E2a of the limit thermistor 102 deviates from the measured value E1a of the hot water thermistor 101 as shown by the alternate long and short dash line in FIG. 6 (see time T22).

Therefore, the determination unit 203 according to the present embodiment compares the measured value V2 of the limit thermistor 102 with the measured value V1 of the hot water thermistor 101, and finds the difference between the measured value V1 and the measured value V2 (difference F1 at time T22). When it is larger than the threshold value TH, the limit thermistor 102 is determined to be abnormal (specifically, an abnormality due to temperature drift).

As described above, by using the difference between the measured value V2 of the limit thermistor 102 and the measured value V1 of the hot water thermistor 101, the abnormality of the limit thermistor 102 can be determined more accurately.

The above-mentioned threshold value TH is set to a value (for example, 14 ° C.) at which it can be estimated that the measured value V2 of the limit thermistor 102 and the measured value V1 of the hot water thermistor 101 deviate from each other due to temperature drift. Not limited to.

Further, the determination unit 203 may periodically determine the abnormality of the limit thermistor 102. For example, the determination unit 203 may determine the abnormality of the limit thermistor 102 at predetermined time intervals (see FIG. 6).

In this way, the determination unit 203 can suppress the erroneous determination of the abnormality of the limit thermistor 102 by performing the abnormality determination of the limit thermistor 102 at predetermined time intervals, in other words, periodically. Become. Further, the number of times of abnormality determination processing can be relatively reduced, and thus the processing load of the control unit 200 can be reduced.

The above-mentioned specified time is set to, for example, 24 hours, but is not limited to this, and can be set to any value. Further, in the above, the determination unit 203 determines the abnormality of the limit thermistor 102 at predetermined time intervals, but the present invention is not limited to this, and for example, it is determined after the washing water to the nozzle 90 is stopped. The abnormality determination of the limit thermistor 102 may be performed every time other conditions such as the passage of time are satisfied.

Further, since the hot water thermistor 101 and the limit thermistor 102 are arranged in the hot water storage tank 50 under the environment of the same temperature change as described above, the measurement result (measured value) of the same washing water is normal. ). Therefore, if an abnormality occurs in the limit thermistor 102, a difference is likely to occur between the measured value V1 of the hot water thermistor 101 and the measured value V2 of the limit thermistor 102. It is possible to determine the abnormality of 102 with high accuracy and at an early stage.

In the above, the determination unit 203 compares the measured value V2 of the limit thermistor 102 with the measured value V2 measured by the hot water thermistor 101 to determine the abnormality of the limit thermistor 102, but the limitation is limited to this. It is not something that is done.

That is, the comparison target of the measured value V2 of the limit thermistor 102 is not limited to the hot water thermistor 101. For example, the sanitary cleaning device 20 may include a room temperature thermistor 300 as shown by an imaginary line in FIG. 2, and may compare the measured value of the room temperature thermistor 300 with the measured value V2 of the limit thermistor 102. The room temperature thermistor 300 is a temperature sensor that measures the room temperature of the toilet room 1 (see FIG. 1), and is attached to, for example, a case 23.

Then, the determination unit 203 may compare the measured value V2 of the limit thermistor 102 with the room temperature thermistor 300, and if the difference between the measured values is larger than the threshold value, determine that the limit thermistor 102 is abnormal. The room temperature thermistor 300 is an example of a predetermined temperature sensor.

Further, for example, the determination unit 203 may compare the measured value V2 of the limit thermistor 102 with the past measured value V2x of the limit thermistor 102. That is, for example, the determination unit 203 stores the past measured value V2x of the limit thermistor 102 in the storage unit 210. Then, when the measured value V2 of the limit thermistor 102 is measured, the determination unit 203 reads the past measured value V2x from the storage unit 210 and compares the measured value V2 with the measured value V2x. When the difference between the measured value V2 and the measured value V2x is larger than the threshold value, the determination unit 203 may determine that the limit thermistor 102 is abnormal. The limit thermistor 102 is an example of a predetermined temperature sensor.

In this way, the determination unit 203 detects an abnormality in the limit thermistor 102 even when the measured value V2 of the limit thermistor 102 is compared with the measured value of the room temperature thermistor 300 or the past measured value V2x of the limit thermistor 102. It can be judged with high accuracy.

The comparison target of the measured value V2 of the limit thermistor 102 described above is merely an example and is not limited, and may be a measured value of another type of temperature sensor.

Further, the water supply control unit 201 (see FIG. 2) can execute the abnormality handling process when the determination unit 203 determines that the limit thermistor 102 is abnormal. For example, when the limit thermistor 102 is determined to be abnormal, the water supply control unit 201 may control the valve unit 40 to prohibit the supply of wash water to the nozzle 90, that is, from the nozzle 90 of the wash water. You may forcibly stop the discharge of.

Thereby, in the present embodiment, when the limit thermistor 102 is abnormal, it is possible to prevent the high-temperature washing water from being discharged from the nozzle 90.

In the above, the water supply control unit 201 controls the valve unit 40 to prohibit the supply of wash water to the nozzle 90, but the present invention is not limited to this, and for example, by controlling the switching valve 80, the nozzle 90 can be supplied. The supply of wash water may be prohibited. That is, even if the water supply control unit 201 controls the switching valve 80 so that the outflow destination of the washing water flowing through the water supply channel 30 is not switched to the nozzle 90, the water supply of the washing water to the nozzle 90 is prohibited. good.

Further, the heater control unit 202 (see FIG. 2) can execute the abnormality handling process when the determination unit 203 determines that the limit thermistor 102 is abnormal. For example, when the limit thermistor 102 is determined to be abnormal, the heater control unit 202 prohibits the heating of the washing water by the heater 51, that is, stops the temperature control by the heater 51 and does not heat the washing water. To do so.

Thereby, in the present embodiment, when the limit thermistor 102 is abnormal, it is possible to prevent the high-temperature washing water from being discharged from the nozzle 90. Further, since the cleaning water can be discharged from the nozzle 90, the sanitary cleaning device 20 can be continuously used.

Further, when the determination unit 203 determines that the limit thermistor 102 is abnormal, the determination unit 203 may notify the user as an abnormality response process. For example, the determination unit 203 may notify that an abnormality has occurred in the limit thermistor 102 via lighting of a lamp provided in the sanitary cleaning device 20, sound (voice) of a speaker, or the like.

It should be noted that some of the above-mentioned prohibition of supplying wash water to the nozzle 90, prohibition of heating of wash water by the heater 51, and notification to the user may be performed as an abnormality response process, or all of them may be performed. It may be performed as an abnormality response process. Further, the content of the abnormality handling process is not limited to the above example.

<Procedure for determining abnormality of limit thermistor>
Next, with reference to FIG. 7, the abnormality determination processing procedure of the limit thermistor 102 by the control unit 200 of the sanitary cleaning device 20 will be described. FIG. 7 is a flowchart showing a processing procedure executed by the control unit 200. In FIG. 7, the abnormality determination process of the limit thermistor 102, which is performed after the boiling control is executed, will be described as an example.

As shown in FIG. 7, the control unit 200 determines whether or not a predetermined time has elapsed since the previous abnormality determination process (step S10). When it is determined that the specified time has not elapsed (steps S10, No), the control unit 200 repeats the process of step S10.

When it is determined that the specified time has elapsed (step S10, Yes), the control unit 200 determines whether or not the heater has been turned on (step S11). When it is determined that the heater 51 is not turned on (steps S11 and No), the control unit 200 returns to the process of step S11.

On the other hand, when it is determined that the heater 51 is turned on (step S11, Yes), the control unit 200 determines whether or not the heater 51 is turned off (step S12). When it is determined that the heater 51 is not turned off (steps S12, No), the control unit 200 returns to the process of step S12.

On the other hand, when it is determined that the heater 51 is turned off (step S12, Yes), the control unit 200 determines whether or not the washing water to the nozzle 90 is stopped by the valve unit 40 (step S13). ..

When it is determined that the washing water to the nozzle 90 is not in the stopped state (steps S13, No), the control unit 200 repeats the process of step S13. Then, when the control unit 200 determines that the washing water to the nozzle 90 is stopped (steps S13, Yes), a predetermined time has elapsed since the washing water to the nozzle 90 was stopped. Whether or not it is determined (step S14).

When it is determined that the predetermined time has not elapsed (steps S14, No), the determination unit 203 repeats the process of step S14. Then, when it is determined that the predetermined time has elapsed (step S14, Yes), the determination unit 203 acquires the measured value A1 of the hot water thermistor 101 (step S15).

Next, the control unit 200 acquires the measured value B1 of the limit thermistor 102 (step S16). Next, the control unit 200 determines whether or not the absolute value of the difference between the measured value A1 of the hot water thermistor 101 and the measured value B1 of the limit thermistor 102 is equal to or less than the threshold value TH (step S17).

When the control unit 200 determines that the absolute value of the difference between the measured value A1 and the measured value B1 is equal to or less than the threshold value TH (steps S17, Yes), the control unit 200 increments the normal counter (step S18). Next, the control unit 200 determines whether or not the normal counter has reached a predetermined value (for example, 3) or more (step S19).

When it is determined that the normal counter does not exceed the predetermined value (steps S19, No), the control unit 200 returns to the process of step S15. On the other hand, when the control unit 200 determines that the normal counter exceeds a predetermined value (step S19, Yes), the control unit 200 determines that the limit thermistor 102 is normal (step S20).

When the control unit 200 determines that the absolute value of the difference between the measured value A1 of the hot water thermista 101 and the measured value B1 of the limit thermista 102 is not equal to or less than the threshold value TH (steps S17, No), that is, the measured value A1 When the absolute value of the difference from the measured value B1 is larger than the threshold value TH, the abnormality counter is incremented (step S21). Subsequently, the control unit 200 determines whether or not the abnormality counter has reached a predetermined value (for example, 3) or more (step S22). The predetermined value can be set to any value.

When it is determined that the abnormality counter does not exceed the predetermined value (steps S22 and No), the control unit 200 returns to the process of step S15. On the other hand, when the control unit 200 determines that the abnormality counter exceeds a predetermined value (steps S22, Yes), the control unit 200 determines that the limit thermistor 102 is abnormal (step S23).

Next, the control unit 200 performs an abnormality response process such as prohibiting the supply of wash water to the nozzle 90 (step S24), and ends the process.

If, for example, the abnormality determination of the limit thermistor 102 is performed at the same time as the washing water to the nozzle 90 is stopped, the process of step S14 described above is removed.

As described above, the sanitary cleaning device 20 according to the embodiment includes a hot water storage tank 50, a nozzle 90, a valve unit (an example of a water supply / stopping unit) 40, a heater 51, a first temperature sensor 101, and a first. It includes one temperature sensor (hot water thermistor) 101, a second temperature sensor (limit thermistor) 102, and a determination unit 203. The hot water storage tank 50 stores wash water. The nozzle 90 discharges the washing water in the hot water storage tank 50 toward the local part of the human body. The valve unit 40 switches between supplying and stopping the washing water supplied to the nozzle 90. The heater 51 heats the washing water in the hot water storage tank 50. The first temperature sensor 101 measures the temperature of the washing water in the hot water storage tank 50, and the measured value is used for on / off control of the heater 51. The second temperature sensor 102 measures the temperature of the washing water in the hot water storage tank 50, and the measured value is used for determining whether or not the temperature of the washing water in the hot water storage tank 50 is equal to or higher than a predetermined temperature.

The determination unit 203 includes a measured value of the second temperature sensor 102 measured when the washing water to the nozzle 90 is stopped by the valve unit 40, and a predetermined temperature sensor (for example, the first temperature sensor 101) set in advance. ), The abnormality determination of the second temperature sensor 102 is performed. As a result, the abnormality of the second temperature sensor 102 can be accurately determined.

Further effects and variations can be easily derived by those skilled in the art. For this reason, the broader aspects of the invention are not limited to the particular details and representative embodiments expressed and described above. Thus, various modifications can be made without departing from the spirit or scope of the general concept of the invention as defined by the appended claims and their equivalents.

20 Sanitary cleaning device 40 Valve unit (an example of water supply / stop part)
50 Hot water storage tank 51 Heater 90 Nozzle 101 First temperature sensor (hot water thermistor)
102 Second temperature sensor (limit thermistor)
201 Water supply control unit 202 Heater control unit 203 Judgment unit

Claims (7)

A hot water storage tank that stores wash water and
A nozzle that discharges the washing water in the hot water storage tank toward the human body,
A water supply / stop section that switches between water supply and water stoppage of the wash water supplied to the nozzle, and
A heater that heats the washing water in the hot water storage tank and
A first temperature sensor that measures the temperature of the washing water in the hot water storage tank and uses the measured value to control the on / off of the heater.
A second temperature sensor that measures the temperature of the washing water in the hot water storage tank and uses the measured value to determine whether the temperature of the washing water in the hot water storage tank is equal to or higher than a predetermined temperature.
Based on the measured value of the second temperature sensor measured when the washing water to the nozzle is stopped by the water supply / stopping unit and the measured value measured by a predetermined temperature sensor set in advance. , A sanitary cleaning device including a determination unit for determining an abnormality of the second temperature sensor. The determination unit
The measured value of the second temperature sensor measured when the heater is turned off and the washing water to the nozzle is stopped by the water supply / stopping unit, and the measurement measured by the predetermined temperature sensor. The sanitary cleaning device according to claim 1, wherein an abnormality determination of the second temperature sensor is performed based on the value. The predetermined temperature sensor is
The first temperature sensor.
The determination unit
The invention according to claim 1 or 2, wherein when the difference between the measured value of the second temperature sensor and the measured value of the first temperature sensor is larger than the threshold value, it is determined that the second temperature sensor is abnormal. Sanitary cleaning equipment. The first temperature sensor and the second temperature sensor are
The sanitary cleaning apparatus according to any one of claims 1 to 3, wherein at least a part of each other is arranged so as to overlap each other in the vertical direction. The determination unit
The sanitary cleaning apparatus according to any one of claims 1 to 4, wherein an abnormality determination of the second temperature sensor is performed at predetermined time intervals. One of claims 1 to 5, wherein when the determination unit determines that the second temperature sensor is abnormal, the heater control unit for prohibiting the heating of the washing water by the heater is provided. Described sanitary cleaning equipment. Any one of claims 1 to 6, further comprising a water supply control unit that prohibits the supply of wash water to the nozzle when the determination unit determines that the second temperature sensor is abnormal. Sanitary cleaning equipment described in.

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