JP2007239201A - Temperature control device for instantaneous hot water supply type shower toilet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature control device for an instantaneous hot water supply type shower toilet, capable of avoiding improper temperature of hot water due to the dispersion of a temperature detecting means. <P>SOLUTION: When a heater has no heating operation, a correcting means uses a heater inlet temperature detecting means for detecting a measured temperature Tin and uses a heater outlet temperature detecting means for detecting a measured temperature Tout. When the heater has no heating operation and a difference ΔT exists between the measured temperature Tout and the measured temperature Tin, a correction constant τ1 is set so that the measured temperature Tout approaches a virtual true value Tvir between the measured temperature Tout and the measured temperature Tin, and a value obtained by adding the correction constant τ1 to the measured temperature by the heat outlet temperature detecting means is set as a corrected temperature T'out for the heater outlet temperature detecting means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a temperature control device for an instant hot water type shower toilet that employs a method of quickly heating water for local washing.

  Conventionally, in a shower toilet, a method of storing water that is discharged from a nozzle to wash a local part as hot water and stored in a hot water tank has been adopted. However, in this method, since a hot water tank having a large volume is provided, there is a limit in achieving space saving and energy saving.

  Therefore, in recent years, a temperature control device for an instant hot water type shower toilet that quickly heats water discharged from a nozzle when washing a local part is known (Patent Document 1). In this case, the hot water tank can be abolished or downsized, which is advantageous for space saving and energy saving. As such a temperature control device, a heater for heating water in a water supply section where water for washing the local area exists, a nozzle for discharging water heated by the heater toward the local area, and after heating with the heater Heater outlet temperature detection means for detecting water temperature, hot water temperature setting means for setting a target temperature of water discharged from the nozzle, and user water volume setting means for setting the amount of water discharged from the nozzle per unit time It is known that

  Also, a heat storage tank, a mixing unit that mixes hot water and tap water in the heat storage tank, a heat source device that heats the hot water that has passed through the mixing unit, a mixed water thermistor that detects the temperature downstream of the mixing unit, and a heat source A cogeneration system including a hot water supply thermistor that detects a temperature on the downstream side of the machine and a hot water supply system of a solar system are disclosed (Patent Document 3). According to this, in the non-operating state of the heat source device, the mixing unit is controlled according to the temperature detected by the mixed water thermistor, and the temperature is controlled so that the temperature of the hot water matches the set temperature. Further, in the operation state of the heat source device, the heat source device is controlled according to the temperature detected by the hot water supply thermistor so that the temperature of the hot water matches the set temperature.

  According to this system, since the mixed water thermistor and the hot water supply thermistor are provided on the same path, the measured temperature by the mixed water thermistor and the measured temperature by the hot water thermistor are essentially the same when the heat source device is not operating. Should be. However, even if hot water at the same temperature is measured, there may be a difference between the measured temperatures. In this case, when transitioning from the non-operating state of the heat source unit to the operating state of the heat source unit, in the non-operating state of the heat source unit, the temperature of the hot water source is set with reference to the mixed water thermistor. In the operating state, the temperature of the hot water is set based on the hot water supply thermistor. For this reason, a difference occurs in the temperature of the hot water between the non-operating state of the heat source unit and the operating state of the heat source unit. Therefore, according to the technique according to Patent Document 3, when the heat source device is not in operation, the difference h between the temperature measured by the mixed water thermistor and the temperature measured by the hot water supply thermistor is obtained and this difference is taken into consideration. That is, when the heat source device is not operated, the temperature measured by the mixed water thermistor is 40 ° C., and when the temperature measured by the hot water supply thermistor is 40.8 ° C., the difference h (0.8 ° C.) is obtained. When the heat source machine is in a non-operating state, the temperature measured by the mixed water thermistor is the reference, so the hot water is set to 40 ° C. However, when shifting from the non-operating state of the heat source unit to the operating state of the heat source unit, the measured temperature by the hot water supply thermistor that detects the temperature higher is the reference even though the actual temperature of the hot water is 40 ° C. The temperature of the hot water is controlled to be lowered by 0.8 ° C., and as a result, the actual temperature of the hot water is 39.2 ° C. Therefore, according to the technique according to Patent Document 2, when the heat source device is shifted from the non-operating state to the operating state of the heat source device, the difference (h) described above is added to the actual measured temperature by the hot water supply thermistor, and the addition is performed. The temperature is controlled so as to maintain the temperature of the hot water.

Furthermore, there is disclosed a hot water supply temperature control device that performs a correction operation on a digital voltage value converted by an A / D conversion circuit and performs temperature control using the voltage value after the correction operation (Patent Document 3).
JP 2001-132061 A JP 2005-114258 A Japanese Patent Laying-Open No. 2005-030666

  By the way, accuracy tolerances exist in the temperature sensor. For example, there is generally a tolerance of about plus or minus 2% with respect to the true value of the temperature of hot water. Therefore, there is a possibility that the temperature of the hot water may deviate in the range of + 2 ° C. to −2 ° C. relative to the target temperature of the hot water. For this reason, when washing a local part with warm water, there exists a possibility that the warm water of the temperature different from a user's intent may be discharged, and there exists a limit in the further improvement of the comfort of a washing process. Therefore, in the manufacturing process, a temperature sensor having a small variation is selected and a temperature sensor having a small variation is assembled. However, this measure causes an increase in cost.

  The present invention has been made in view of the above-described circumstances, and provides a temperature control device for an instantaneous hot water type shower toilet that is advantageous for preventing inappropriate temperature of hot water due to variations in temperature detection means. Let it be an issue.

A temperature control device for an instant hot water type shower toilet according to the present invention includes a heater for heating water flowing through a water supply channel in order to wash a local part of a human body,
A hot water discharge section that discharges water heated by the heater toward a local part of the human body;
Hot water temperature setting means for setting a target temperature Tset of hot water discharged from the hot water discharge section;
A heater inlet temperature detection means for detecting the temperature of water before being heated by the heater;
A heater outlet temperature detecting means for detecting the temperature of hot water after being heated by the heater;
In a temperature control device for a shower toilet comprising a control means for controlling a heater,
The control means
When the heater is not heating, the measured temperature Tin is detected by the heater inlet temperature detecting means and the measured temperature Tout is detected by the heater outlet temperature detecting means, and there is a difference ΔT between the measured temperature Tout and the measured temperature Tin. Correction constant setting means for setting the correction constant τ1 for the heater outlet temperature detection means so that the measurement temperature Tout approaches the virtual true value Tvir between the measurement temperature Tout and the measurement temperature Tin;
Correction means for executing a correction process in which a value obtained by adding the correction constant τ1 to the measured temperature Tout of the heater outlet temperature detection means is used as the correction temperature of the heater outlet temperature detection means;
Control amount setting means for setting a control amount for the heater so that the target temperature Tset of the hot water set by the hot water temperature setting means corresponds to the correction temperature of the heater outlet temperature detection means corrected by the correction means. It is characterized by comprising.

  According to the present invention, when the heater is not heated, the correction constant setting means detects the measured temperature Tin by the heater inlet temperature detecting means and detects the measured temperature Tout by the heater outlet temperature detecting means. Further, the correction constant setting means includes a heater so that when the difference ΔT exists between the measured temperature Tout and the measured temperature Tin, the measured temperature Tout approaches the virtual true value Tvir between the measured temperature Tout and the measured temperature Tin. A correction constant τ1 for the outlet temperature detecting means is set.

  The correction unit executes a correction process in which a value obtained by adding the correction constant τ1 to the measured temperature of the heater outlet temperature detection unit is used as the correction temperature of the heater outlet temperature detection unit. This can prevent the temperature of the hot water from becoming inappropriate due to variations in the temperature detection means. The correction constant setting process described above may be performed at the time of manufacture, or may be performed regularly or irregularly in the use stage. If the correction constant setting process is performed regularly or irregularly at the use stage, even when the temperature detecting means deteriorates over time, it is possible to cope with variations caused by the age deterioration of the temperature detecting means. Inappropriate temperature can be prevented.

  According to the present invention, it is possible to prevent the temperature of the hot water from becoming inappropriate due to variations in the temperature detection means.

  According to the present invention, the control means is means for controlling the physical amount of heater power to be supplied to the heater. According to the present invention, the heater may be for AC or DC. The heater power physical quantity can exemplify a form that is a duty value or a current value of a current flowing through the heater. The duty value is defined as {ON time / (ON time + OFF time)}.

  According to the present invention, the correction constant setting means sets the virtual true value Tvir between the measured temperature Tin of the heater inlet temperature detecting means and the measured temperature Tout of the heater outlet temperature detecting means when the heater is not heated. The value obtained by subtracting the measured temperature Tout of the heater outlet temperature detection means from the virtual true value Tvir is multiplied by a predetermined ratio k (k is an arbitrary number from 0.1 to 1.3, and 1 is mainly used). A mode in which the value is a correction constant τ1 for the heater outlet temperature detection means is exemplified. For the virtual true value Tvir, the virtual true value Tvir can be obtained by dividing the sum of the measured temperature Tin and the measured temperature Tout by the number of temperature detection means (for example, two).

  The correction means sets a value obtained by adding the correction constant τ1 to the measured temperature Tout of the heater outlet temperature detection means when the heater is heating, as the correction temperature T′out of the heater outlet temperature detection means. Thereby, the measurement temperature of the heater outlet temperature detection means is optimized.

  Further, according to the present invention, the correction constant setting means has a ratio k (k is an arbitrary number from 0.1 to 1.3) to a value obtained by subtracting the measured temperature Tin of the heater inlet temperature detection means from the virtual true value Tvir. In this example, a value obtained by multiplying 1) is set as the correction constant τ2 for the heater inlet temperature detection means. The correction means sets a value obtained by adding the correction constant τ2 to the measured temperature Tin of the heater inlet temperature detection means when the heater is operating, as the correction temperature T′in of the heater inlet temperature detection means. As a result, the temperature measured by the heater inlet temperature detecting means is optimized. As the ratio described above, 0.7 to 1.3 times is an arbitrary value of 0.8 to 1.2, an arbitrary value of 0.9 to 1.1, an arbitrary value of 0.95 to 1.05, 0 An arbitrary value of .98 to 1.02 is exemplified.

  According to the present invention, when the difference ΔT is larger than the predetermined value, there is a high possibility that the heater inlet temperature detecting means and / or the heater outlet temperature detecting means are deteriorated due to deterioration over time. Therefore, according to the present invention, when ΔT is larger than a predetermined value, the temperature detection unit outputs a warning signal indicating that the function has been reduced, or has a warning unit that limits the heat generation of the heater. As a result, the heat generation of the heater is optimized and it is suppressed that hot water having an inappropriate temperature is discharged toward the local area.

  According to the present invention, when the heater is not generating heat, the correction constant setting means allows the user to place the toilet seat on the toilet seat immediately before the cleaning process in which the user cleans the local area with the hot water discharged from the hot water discharge section. A mode in which the correction constant setting process is executed under the condition that the heater does not generate heat when at least one of the conditions is satisfied when the user is seated, when the user is not seated on the toilet seat, or when the user is at night Is exemplified. When these conditions are satisfied, there is no direct influence on the cleaning process for cleaning the local portion.

  According to the present invention, a mode in which a hot water temperature setting means for setting a target temperature Tset of hot water discharged from the hot water discharge unit by a user is provided is exemplified.

  According to the present invention, the control means obtains a temperature deviation ε between the target temperature Tset of the hot water set by the hot water temperature setting means and the corrected temperature T′out of the hot water detected by the heater outlet temperature detecting means. A control constant is set according to the set water amount and / or the temperature deviation ε set by the user water amount setting means, and a control amount for the heater is set according to the set water amount, the temperature deviation, and the control constant. And the form which adjusts a control amount or a control constant according to the temperature of the water before the heating detected by the heater inlet temperature detection means is illustrated. Here, the control constant is exemplified as a proportional gain of the proportional element and an integral gain of the integral element. The proportional element is an element that gives an operation amount proportional to the temperature deviation ε, which is the difference between the target temperature Tset of the hot water and the correction temperature T′out of the heater outlet temperature detection means. The proportional gain is a constant used as a proportional element. The integral element is a variable proportional to the integral value of the temperature deviation ε (Tset−T′out), which is the difference between the target temperature Tset of the hot water and the correction temperature T′out of the heater outlet temperature detection means. It is an element to change. The integral gain is a constant used in the integral element. Here, a mode in which the proportional gain and the integral gain are set to increase as the set water amount set by the user water amount setting means increases is exemplified. Thereby, even if the set water amount of water increases, it is possible to cope with an increase in the set water amount of water.

  According to the present invention, the control means increases the proportional gain when the temperature of the water before heating detected by the heater inlet temperature detection means becomes low, and is proportional when the temperature of the water before heating becomes high. The form which reduces a gain is illustrated. As a result, even when the temperature of the water before being heated becomes low, the proportional gain is increased, so that the amount of heating by the heater is increased and the change in the temperature of the water before being heated can be dealt with. Further, even when the temperature of the water before being heated becomes high, the proportional gain is reduced, so that the amount of heating by the heater is reduced, and the temperature of the heated hot water is prevented from being over.

  The control means increases the integral gain when the temperature of the water before heating detected by the heater inlet temperature detection means becomes low, and decreases the integral gain when the temperature of the water before heating becomes high. Illustrated.

  According to the present invention, the first storage element for storing the heater power physical quantity for energizing the heater is provided, and the control means updates the heater power physical quantity every predetermined time and is set by the hot water temperature setting means. The temperature deviation between the target temperature of the hot water to be detected and the temperature of the hot water detected by the heater outlet temperature detection means is obtained, and the total manipulated variable based on the physical quantity and the control constant relating to the temperature deviation obtained this time is obtained and stored in the first storage element. An example is shown in which the current heater power physical quantity is updated by adding the previous heater power physical quantity and the total operation quantity obtained this time, based on the previous heater power physical quantity. In this case, since the previous heater power physical quantity stored in the first storage element is used as a basis, the control time of the control means is shortened.

  The total manipulated variable is exemplified by a form obtained from the sum of the first manipulated variable based on the physical quantity related to the temperature deviation and the proportional gain of the proportional element, and the second manipulated variable based on the physical quantity related to the temperature deviation and the integral gain of the integral element. Is done. Since it is controlled by the proportional element and the integral element, the responsiveness of the temperature of the heated hot water is improved.

  According to the present invention, the second storage element for storing the temperature deviation is provided, and the control means obtains a difference between the previous temperature deviation stored in the second storage element and the temperature deviation obtained this time, The form which calculates | requires the operation amount according to this difference and the proportional gain of a proportional element is illustrated. In this case, since the previous temperature deviation stored in the second storage element is used as a basis, the control time of the control means is shortened.

  Hereinafter, Example 1 of the present invention will be described in detail with reference to FIGS. The shower toilet (human body local washing apparatus) equipped in the Western-style toilet 100 is equipped with a base 102 having an operation panel 101 mounted on the toilet 100, a first nozzle 103f equipped on the base 102, and a base 102. The second nozzle 103s, the toilet seat 104 mounted on the base 102 so as to be rotatable in the vertical direction, and the toilet lid 105 mounted on the base 102 so as to be rotatable in the vertical direction. A temperature control device is provided inside the base 102. The first nozzle 103f is for washing one of the defecation local part and the female local part. The second nozzle 103s is for washing the other of the defecation local part and the female local part. The water heated by the heater 3 of the temperature control device is appropriately switched to one of the first nozzle 103f and the second nozzle 103s and discharged in accordance with the operation of the cleaning switch 20 of the operation panel 101. The first nozzle 103f and the second nozzle 103s are simply referred to as the nozzle 103 (corresponding to the hot water discharge unit).

  FIG. 2 is a block diagram relating to a temperature control device for a shower toilet. As shown in FIG. 2, the temperature control device connects a water source 1a (generally a water pipe) and a nozzle 103 to wash a local part of the human body and supplies a water supply channel 1 as a water supply unit for flowing water from the water source. A valve 1v as a water supply element that opens and closes the water supply channel 1, a water amount sensor 2 that detects the amount of water flowing through the water supply channel 1, and a heater material that heats the water flowing through the water supply channel 1 to make hot water (generally And a nozzle 3 (first nozzle 103f, second nozzle 103s) that discharges water heated by the heater 3 provided at the tip of the water supply channel 1 toward the local area. And a water amount changer 4 provided in the water supply path 1 for changing the amount of water discharged from the nozzle 103, a temperature fuse 5 for cutting off a current to be supplied to the heater 3 when an overcurrent flows through the heater 3, and heating by the heater 3. Before From the heater inlet temperature sensor 6 as a heater inlet temperature detection means for measuring the temperature of the water, the heater outlet temperature sensor 7 as a heater outlet temperature detection means for measuring the temperature of the water heated by the heater 3, and the nozzle 103 User temperature setting means 8 (warm water temperature setting means) for setting a target temperature of water to be discharged, user water amount setting means 9 for setting the amount of water discharged from the nozzle 103 per unit time, and a control circuit 10 And a duty value generating circuit 11 for generating a duty value D in response to a signal from the control circuit 10. The duty value generation circuit 11 can be constituted by a PWM control circuit, and is connected to the heater 3 supply power circuit 12.

  The water supply channel 1 is formed by a long conduit. The control circuit 10 includes an input processing circuit 13 to which each signal is input, a CPU 14, an output processing circuit 15 that outputs a control signal, and a memory 16 as a storage element. The control circuit 10 and the duty value generation circuit 11 constitute control means. Further, as shown in FIG. 2, a first drive unit 4 m such as a motor that operates the water amount changer 4 and a second drive unit 103 m such as a motor that operates the nozzle 103 are provided. The control circuit 10 outputs a signal for controlling the operation of the first drive unit 4 m and the second drive unit 103 m and the operation of the alarm device 17.

  As shown in FIG. 2, the operation panel 101 is equipped with user temperature setting means 8, user water amount setting means 9, and a washing switch 20. The signal of the user temperature setting means 8, the signal of the user water amount setting means 9, the signal of the washing switch 20, the signal of the heater inlet temperature sensor 6, and the signal of the heater outlet temperature sensor 7 are respectively input to the input processing circuit 13 of the control circuit 10. Is done. When the user operates the user water amount setting means 9 to switch the set water amount Q, the first drive unit 4m operates the water amount changer 4 in response to a signal from the user water amount setting means 9, thereby discharging the unit 103 from the nozzle 103. Control the amount of water.

  A pulsed current is energized to the heater 3 via the temperature fuse 5 according to the duty value D generated by the duty value generation circuit 11, and the heater 3 generates heat according to the duty value D. When the duty value D is large, the heating amount by the heater 3 increases. When the duty value D is small, the heating amount by the heater 3 decreases. The duty value D [%] is defined as {ON time / (ON time + OFF time) × 100%}.

  When the user operates the user temperature setting means 8 to change the target temperature Tset of water, the duty value D of the current output from the duty value generation circuit 11 is changed according to the signal from the user temperature setting means 8, As a result, the heating amount of the heater 3 per unit time is changed. Thereby, the temperature of the water discharged from the nozzle 103 is adjusted to an appropriate temperature.

  A current is supplied to the heater 3 with the duty value D thus obtained, the heater 3 is heated, and the water in the water supply channel 1 is heated. As a result, heated water is discharged from the nozzle 103 and used to clean the local part of the human body. A current is supplied to the heater 3 with the duty value D changed in this way, the heater 3 is heated, and the water in the water supply channel 1 is heated. Thus, heated water is discharged from the nozzle 103 and used for local cleaning. As a result, even if there is a change in the set water amount Q per unit time discharged from the nozzle 103 in accordance with the change in the set water amount Q in the user water amount setting means 9, the change in the set water amount Q is performed. The duty value D can be quickly responded to, and the heating amount of the heater 3 can be quickly responded. Therefore, it is advantageous for suppressing fluctuations in the temperature of the water discharged from the nozzle 103, and the possibility that the user feels uncomfortable with the fluctuations in the water temperature is improved at the time of washing the local part of the human body.

  Now, according to the present embodiment, the control circuit 10 (control means) executes the correction constant setting process when the heater 3 is not heated. The correction constant setting process can be executed at the time of manufacture, and is executed periodically or irregularly when the toilet seat is installed on the toilet. The correction constant setting process is premised on measuring the temperature of water at the same temperature by the heater inlet temperature sensor 6 and the heater outlet temperature sensor 7. For this reason, the correction constant setting process is executed when the heater 3 is not heated.

  In the correction constant setting process, the control circuit 10 detects the signal of the measured temperature Tin of the heater inlet temperature sensor 6 and detects the signal of the measured temperature Tout of the heater outlet temperature sensor 7. The measured temperature Tout detected by the heater outlet temperature sensor 7 even when the heater 3 is not generating heat and the temperature of the water before and after the heater 3 in the water supply channel 1 is essentially the same. And a difference detected by Tin detected by the temperature heater inlet temperature sensor 6 may exist. This is presumed to be caused by individual variation due to the heater outlet temperature sensor 7 and the temperature heater inlet temperature sensor 6. In this case, the control circuit 10 sets τ1 as a correction constant for the temperature heater outlet temperature sensor 7, sets τ2 as a correction constant for the temperature heater inlet temperature sensor 6, and stores it in the area of the memory 16. deep.

  The correction constant setting process will be further described. For example, consider a case where 10.0 ° C. water flows through the water supply channel 1 (see FIG. 3). In this case, it is assumed that the water temperature is detected by the heater inlet temperature sensor 6 as 10.5 ° C. and the heater outlet temperature sensor 7 is detected as 8.5 ° C. In this case, due to individual variations, the heater inlet temperature sensor 6 outputs + 0.5 ° C. with respect to the true value (10 ° C.). The heater outlet temperature sensor 7 outputs −1.5 ° C. with respect to the true value (10 ° C.).

  Here, in the correction constant setting process, the measured temperature Tin (10.5 ° C.) of the heater inlet temperature sensor 6 and the measured temperature Tout (8.5 ° C.) of the heater outlet temperature sensor 7 are added, and the added value is detected by the sensor. The average value (9.5 ° C., (10.5 ° C. + 8.5 ° C.) / 2 = 9.5 ° C.) is obtained by dividing by the number (2), and this average value is set as the virtual true value Tvir. Thus, the virtual true value Tvir exists between the measured temperature Tin and the measured temperature Tout.

  On the outlet side, a value obtained by subtracting the measured temperature Tout (8.5 ° C.) of the heater outlet temperature sensor 7 from the virtual true value Tvir (9.5 ° C.) (9.5 ° C.−8.5 ° C. = plus 1 ° C.) ) Is a correction constant τ1 of the heater outlet temperature sensor 7. In this case, the correction constant τ1 is plus 1 ° C.

  On the inlet side, a value obtained by subtracting the measured temperature Tin (10.5 ° C.) of the heater inlet temperature sensor 6 from the virtual true value Tvir (9.5 ° C.) (9.5 ° C.-10.5 ° C. = My mass 1) (° C.) is a correction constant τ 2 of the heater inlet temperature sensor 6. In this case, the correction constant τ2 is 1 mass. Here, since the predetermined ratio is 1, no particular division is performed.

  Here, the corrected temperature of the heater outlet temperature sensor 7 is 9.5 ° C. (8 ° C.) by adding the measured temperature Tout (8.5 ° C.) of the heater outlet temperature sensor 7 and the correction value τ 1 (plus 1 ° C.). 0.5 ° C. + (+ 1 ° C.) = 9.5 ° C.). This is set as a correction temperature T′out of the heater outlet temperature sensor 7. Further, the corrected temperature of the water at the heater inlet temperature sensor 6 is 9.5 ° C. by adding the measured temperature Tin (10.5 ° C.) of the heater inlet temperature sensor 6 and the correction constant τ 2 (my mass 1 ° C.). (10.5 ° C. + (− 1 ° C.) = 9.5 ° C.). This is the correction temperature T′in of the heater inlet temperature sensor 6.

  FIG. 4 shows an example in which 10.0 ° C. water flowing through the water supply channel 1 is heated by the heater 3 to generate hot water having a target temperature of 39.5 ° C. The control circuit 10 (control means) detects a signal of the measured temperature Tin of the heater inlet temperature sensor 6 and also detects a signal of the measured temperature Tout of the heater outlet temperature sensor 7. In this case, as described above, it is considered that the measurement temperature Tout was actually measured (before correction) at 39.5 ° C. In this case, since the heater outlet temperature sensor 7 is a sensor that outputs −1.5 ° C. with respect to the true value (10 ° C.) as described above, the true value of the temperature of the hot water heated by the heater 3 is 41.0 ° C. (39.5 ° C. + 1.5 ° C. = 41.0 ° C.). Therefore, when the correction process is not executed, the actual temperature of the hot water is 41.0 ° C. even though the target temperature is 39.5 ° C., and the local portion is washed with hot water much higher than the target temperature. .

  On the other hand, when the control circuit 10 (control means) executes the correction process, the control circuit 10 determines that the temperature T′out of the hot water after correcting the actual measured temperature of the heater outlet temperature sensor 7 is the target temperature. Control to 39.5 ° C. In this case, the correction temperature T′out of the heater outlet temperature sensor 7 is the sum of the actual measurement temperature Tout and the correction constant τ1 (plus 1 ° C.), and is 39.5 ° C. Therefore, the actual measured temperature of the heater outlet temperature sensor 7 is 38.5 ° C. (39.5 ° C.−1 ° C. = 38.5 ° C.). In this case, since the heater outlet temperature sensor 7 outputs -1.5 ° C. with respect to the true value as described above, the true value of the hot water heated by the heater 3 is 40.0 ° C. (38 0.5 + 1.5 ° C. = 40.0 ° C.). Therefore, when the correction process is executed, when the target temperature of the hot water is 39.5 ° C., the actual temperature of the hot water is 40.0 ° C., and the target temperature of the hot water and the actual temperature of the hot water are close to each other. Improves accuracy. Therefore, when the correction process is executed, the actual temperature of the hot water is considerably close to the target temperature, even if there are individual variations in the heater inlet temperature sensor 6 and the heater outlet temperature sensor 7, and the temperature is optimized. The local area is washed well with warm water. Table 1 summarizes this.

  As described above, in the correction constant setting process according to the present embodiment, the virtual true value Tvir between the sensor output value of the heater inlet temperature sensor 6 and the sensor output value of the heater outlet temperature sensor 7 is obtained, and The difference between the sensor output value and the virtual true value Tvir is set as correction constants τ1, τ2. In this case, a similar result can be obtained by dividing each sensor output value by 2 and then adding the two values.

  The horizontal axis of FIG. 6 shows the variation of the output value of the temperature sensor, and the vertical axis shows the frequency. (A) shows the variation distribution of the output value of one temperature sensor. As shown in (a), it is assumed that the temperature sensor has a variation of + 2 ° C. to −2 ° C. with respect to the average value, and the standard deviation is σ. (B) shows the variation distribution of the output value when the sensor output value is divided by two. In this case, the standard deviation is σn (σn = 1/2 · σ).

  According to the present embodiment, since a total of two heater inlet temperature sensors 6 and heater outlet temperature sensors 7 are used, two variation distributions are added as shown in FIG. A standard deviation in a distribution obtained by adding two variation distributions is σz. In this case, the following expressions (1) to (5) are established.

σz ² = σn ² + σn ² (1)
^{= 1/4 · σ 2 +1/4} · σ 2 ... (2)
= 1/2 · σ ² (3)
= 0.5 · σ ² (4)
σz≈0.7σ (5)
Therefore, when two temperature sensors are used, the tolerance can be reduced to about 70% and reduced by 30% in consideration of variations in sensor output values compared to the case where one temperature sensor is used. Can do.

  FIG. 8 shows a flowchart of correction constant setting processing (processing for obtaining correction constants τ1, τ2) executed by the CPU 14 of the control circuit 10. First, conditions for starting the correction constant setting process are read (step S2). It is determined whether or not a condition for starting the correction constant setting process is satisfied (step S4). The correction constant setting process is preferably performed in a state where the heater 3 is not generating heat. Here, immediately before the cleaning process in which the user cleans the local area with hot water discharged from the nozzle 103, immediately after the cleaning process, when the user is seated on the toilet seat 104, when the user is not seated on the toilet seat 104, at night In some cases, since the heater 3 is not generating heat, a correction constant setting process is executed.

  That is, the heater 3 generates heat during the cleaning process. For this reason, since the heater has not yet generated heat immediately before the cleaning process, it is convenient to execute the correction constant setting process. Immediately after the cleaning process, since the warm water heated by the heater 3 is discharged from the water supply path 1, cold water is present in the passage before and after the heater 3 in the water supply path 1, and a correction constant is set. It is convenient to execute the process. Further, at night time such as midnight, the heater 3 is less frequently heated by the cleaning process, which is convenient for executing the correction constant setting process. Further, when the user is seated on the toilet seat 104, it is convenient to execute the correction constant setting process unless the cleaning process in which the heater 3 generates heat is performed. If the user is not seated on the toilet seat 104, the cleaning process is not executed and the heater 3 is not generating heat, which is convenient for executing the correction constant setting process.

  If the conditions for starting the correction process are satisfied, a signal for turning off the heater 3 is output (step S6). Further, by opening the valve 1v (water supply element) of the water supply channel 1, the water before and after the heater 3 in the water supply channel 1 is discharged, and the water before and after the heater 3 is cooled by cold water that is not heated by the heater 3 (non-heated) Water) (step S8). This is because detection error occurs when hot water remains in the water supply channel 1. In this case, water is discharged from the nozzle 103 in order to discharge water before and after the heater 3. Next, a signal of the measured temperature Tin of the heater inlet temperature sensor 6 is detected, and a signal of the measured temperature Tout of the heater outlet temperature sensor 7 is read (step S10). Next, it is determined whether or not the measured temperature Tin and the measured temperature Tout change during a certain time (for example, 100 milliseconds) (step S12). If it has changed, wait until it no longer changes. Accordingly, steps S10 and S12 function as standby means for waiting until the measured temperature Tin and the measured temperature Tout are stabilized.

  If it does not change, the difference ΔT between the measured temperature Tout and the measured temperature Tin is obtained (step S14). The difference ΔT is compared with the predetermined value TX (step S16). When the difference ΔT is larger than the predetermined value TX, it is determined that the function of the heater inlet temperature sensor 6 or the heater outlet temperature sensor 7 has deteriorated (step S18). Then, a sensor alarm signal indicating that the function of the sensor has deteriorated is output to the alarm device 17 (step S20), and the heater 3 is limited so as not to generate heat (step S22). As a result, it is possible to prevent the excessively heated warm water from being discharged. Steps S20 and S22 function as alarm means for alarming sensor functional degradation.

  Here, if the difference ΔT is within the predetermined value TX, the difference ΔT is within the allowable range, so that the correction constant setting process is executed (step S26). Step S26 functions as correction constant setting means. That is, as described above, in the correction constant setting process, the measured temperature Tin of the heater inlet temperature sensor 6 and the measured temperature Tout of the heater outlet temperature sensor 7 are added, and divided by the number of sensors (2). Find the true value Tvir. The virtual true value Tvir is set between the measured temperature Tin and the measured temperature Tout. In calculating the virtual true value Tvir, the weighting coefficient β1 of the heater outlet temperature sensor 7 is set to be the weighting coefficient β2 of the heater inlet temperature sensor 6 = 1: 1.

  Referring to FIG. 3, a value obtained by subtracting the measured temperature Tout (8.5 ° C.) of the heater outlet temperature sensor 7 from the virtual true value Tvir (9.5 ° C.) (9.5 ° C.−8.5 ° C. = plus 1 ° C.) is set as a correction constant τ 1 of the heater outlet temperature sensor 7. Further, a value obtained by subtracting the measured temperature Tin (10.5 ° C.) of the heater inlet temperature sensor 6 from the virtual true value Tvir (9.5 ° C.) (9.5 ° C.-10.5 ° C. = my mass 1 ° C.) The correction constant τ2 of the heater inlet temperature sensor 6 is used. In obtaining the correction constants τ1, τ2, the predetermined ratio is 1. Next, the correction constants τ1, τ2 are stored in the area of the memory 16 (step S28).

  FIG. 9 shows a flowchart of the hot water generation process executed by the CPU 14 of the control circuit 10. When the washing switch 20 for washing the local part of the human body with warm water is operated, the CPU 14 of the control circuit 10 repeatedly executes a program routine every predetermined time. The predetermined time is generally on the order of milliseconds. First, the CPU 14 sets a signal of a user set water amount Q per unit time discharged from the nozzle 103 set by the user water amount setting means 9, a signal of a target temperature Tset of hot water set by the user temperature setting means 8, a heater A signal of the measured temperature Tin from the inlet temperature sensor 6 and a signal of the measured temperature Tout from the heater outlet temperature sensor 7 are read (step SB2). Next, a correction temperature T′in is obtained by adding the correction constant τ2 to the measurement temperature Tin measured by the heater inlet temperature sensor 6, and the correction temperature τ1 is added to the measurement temperature Tout of the heater outlet temperature sensor 7 to obtain the correction temperature. T'out is obtained (step SB4). Next, a temperature deviation ε between the correction temperature T′out and the correction temperature T′in is obtained (step SB6). Further, the proportional gain KP and the integral gain KI are set according to the user set water amount Q, the temperature deviation ε, and the correction temperature T′in (step SB8). Next, a duty value D for energizing the heater 3 is determined according to the set water amount Q, the temperature deviation ε, the proportional gain KP, and the integral gain KI (step SB10). Next, the duty value D is output to the heater 3 (step SB12). As a result, the heater 3 generates heat.

  Here, according to the present embodiment, the proportional gain KP is set to gradually increase when the set water amount Q set by the user water amount setting means 9 increases. As a result, the heating amount of the heater can cope with the increase in the amount of water and the heat generation of the heater 3. Further, the integral gain KI is set to gradually increase as the set water amount Q increases. Thereby, the heat generation of the heater 3 can cope with the increase in the set water amount Q.

  Example 2 of the present invention will be specifically described. The present embodiment basically has the same configuration and the same function and effect as the first embodiment. Also in this embodiment, by adding the correction constant τ2 to the measured temperature Tin measured by the heater inlet temperature sensor 6, the measured temperature Tin is corrected to obtain the corrected temperature T′in. Further, by adding the correction constant τ1 to the measured temperature Tout of the heater outlet temperature sensor 7, the measured temperature Tout is corrected to obtain the corrected temperature T′out.

  In order to accurately detect the temperature of the hot water for washing the local part of the human body, it is preferable that the temperature variation of the heater outlet temperature sensor 7 is set to be small, although the cost of the heater outlet temperature sensor 7 is increased. Therefore, according to the present embodiment, the temperature variation of the heater outlet temperature sensor 7 is set smaller than the temperature variation of the heater inlet temperature sensor 6. Accordingly, the weight coefficient β1 of the heater outlet temperature sensor 7 is relatively large, and the weight coefficient β2 of the heater inlet temperature sensor 6 is relatively small.

  In the correction constant setting process according to the present embodiment, when the heater 3 is not heated, water is supplied to the water supply channel 1 to measure the measured temperature Tin of the heater inlet temperature sensor 6 and the heater outlet temperature sensor 7 The measurement temperature Tout is measured. The measured temperature Tin of the inlet temperature detection sensor 6 and the measured temperature Tout of the heater outlet temperature sensor 7 are assigned to the measured temperature Tin of the heater inlet temperature sensor 6 and the measured temperature Tout of the heater outlet temperature sensor 7, respectively. Is obtained, and this average value is set as a virtual true value Tvir.

Specifically, the weight coefficient β1 of the heater outlet temperature sensor 7 is 3, and the weight coefficient β2 of the heater inlet temperature sensor 6 is 1. In this case, a virtual true value Tvir is obtained by the following equation. Virtual true value Tvir = (Tout × β1 + Tin × β2) / (β1 + β2)
Therefore, for example, when the measured temperature Tin is 12 ° C. and the measured temperature Tout is 10 ° C., the virtual true value Tvir = (10 ° C. × 3 + 12 ° C. × 1) / (3 + 1) = 42/4 = 10.5 ° C.
A heater outlet temperature sensor is obtained by subtracting the measured temperature Tout (10 ° C) from the virtual true value Tvir (10.5 ° C) plus 0.5 ° C (10.5 ° C-10 ° C = + 0.5 ° C). 7 is a correction constant τ1. Further, minus 1.5 ° C. (10.5 ° C.−12 ° C. = − 1.5), which is a value obtained by subtracting the measured temperature Tin (12 ° C.) of the heater inlet temperature sensor 6 from the virtual true value Tvir (10.5 ° C.). ° C.) is a correction constant τ 2 for the heater inlet temperature sensor 6. The predetermined ratio is set to 1.

  When hot water is generated by heating 10 ° C. water with the heater 3, when the measured temperature Tout of the heater outlet temperature sensor 7 is 39 ° C., the measured temperature Tout (39 ° C.) and a correction constant are used. A value (39.5 ° C.) obtained by adding τ 1 (plus 0.5 ° C.) is set as a correction temperature T′out of the heater outlet temperature sensor 7.

  Further, a value obtained by adding a correction constant τ 2 (minus 1.5 ° C.) to the measured temperature Tin (12 ° C.) of the heater inlet temperature sensor 6 10.5 ° C. (12 ° C. + (− 1.5 ° C.) = 10.5 ° C) is defined as a correction temperature T′in of the heater inlet temperature sensor 6.

  The weighting factors β1 and β2 are not limited to the above values, and can be set to weighting factor β1: weighting factor β2 = W: 1 according to the accuracy of the sensors 6 and 7, otherwise But it ’s okay. W is a value from 0.001 to 1000, for example, a value from 1 to 20, a value from 1 to 10, a value from 1 to 5, or 2, 4 can be set.

  A third embodiment of the present invention will be specifically described with reference to FIG. The present embodiment basically has the same configuration and the same function and effect as the first embodiment. Also in this embodiment, the correction temperature T′in is obtained by correcting the measurement temperature Tin by adding the correction constant τ2 to the measurement temperature Tin measured by the heater inlet temperature sensor 6. Further, by adding a correction constant τ1 to the measured temperature Tout of the heater outlet temperature sensor 7, the measured temperature Tout is corrected to obtain a corrected temperature T′out.

FIG. 10 shows a block diagram of control contents executed by the control circuit 10 of this embodiment. This block diagram performs speed-type PI control. Description will be made according to the procedures (1) to (15) added to FIG.
(1) The integral gain setting unit 200 sets the integral gain KI according to the set water amount Q set by the user water amount setting means 9.
(2) The proportional gain KP is set by the proportional gain setting unit 201 in accordance with the set water amount Q set by the user water amount setting means 9. Here, the proportional gain setting unit 201 and the integral gain setting unit 200 constitute a control constant changing unit 203 that changes the control constant according to the set water amount Q set by the user water amount setting unit 9.
(3) The integral gain adjustment ratio setting unit 204 sets the adjustment ratio α2 of the integral gain KI according to the correction temperature T′in of the water before being detected detected by the heater inlet temperature sensor 6.
(4) The proportional gain adjustment ratio setting unit 205 sets the adjustment ratio α1 of the proportional gain KP according to the correction temperature T′in of the water before being heated detected by the heater inlet temperature sensor 6. Here, the proportional gain adjustment ratio setting unit 205 and the integral gain adjustment ratio setting unit 204 adjust the control constants (proportional gain KP and integral gain KI) according to the temperature of the water before being heated by the heater 3. The adjustment ratio setting unit 207 is configured.
(5) The calculation unit 110 obtains a temperature deviation ε which is a difference between the target temperature Tset set by the user temperature setting means 8 and the corrected water temperature T′out detected by the heater outlet temperature sensor 7. Therefore, according to the present embodiment, the water correction temperature T′out detected by the heater outlet temperature sensor 7 is feedback-controlled.
(6) The calculation amount ε · KI is obtained by multiplying the temperature deviation ε this time and the integral gain KI by the calculation unit 112.
(7) The calculation unit 114 obtains a change amount Δε between the current temperature deviation ε and the previous value ε ′ of the temperature deviation. Here, the previous value ε ′ of the temperature deviation is stored in the first storage element 161 (a predetermined area of the memory 16). The previous value ε ′ of the temperature deviation means a temperature deviation in the previous routine rather than the routine currently being executed. In the first routine, the previous value ε ′ of the temperature deviation is set to 0.
(8) The calculation unit 118 multiplies the change amount Δε of the temperature deviation ε by the proportional gain KP of the proportional element to obtain the calculation amount Δε · KP.
(9) The calculation unit 120 multiplies the calculation amount ε · KI obtained in (6) by the adjustment ratio α2 of the integral gain KI to obtain the second manipulated variable H2.
(10) The calculation unit 122 multiplies the calculation amount Δε · KP obtained in (8) by the adjustment ratio α1 of the proportional gain KP to obtain the first operation amount H1.
(11) The first operation amount H1 and the second operation amount H2 are added by the calculation unit 126 to obtain a total operation amount Ht. Here, the previous value D ′ of the duty value is stored in the second storage element 162 (a predetermined area of the memory 16).

  In the first routine, the previous value D ′ of the duty value is set to 0. Based on the previous value D ′ of the duty value stored in the second storage element 162, the control circuit 10 adds the previous value D ′ of the duty value and the total manipulated variable Ht by the calculation unit 130. As a result, the control circuit 10 obtains the current duty value D. Then, the control circuit 10 outputs the current duty value D to the heater 3. The current duty value D 1 is the set water amount Q, the corrected water temperature T′out detected by the heater outlet temperature sensor 7, the corrected water temperature T′in detected by the heater inlet temperature sensor 6, the temperature deviation ε, the temperature. The change amount Δε of the deviation ε, the proportional gain KP, the integral gain adjustment ratio α1, the integral gain KI, and the integral gain KI adjustment ratio α2 are taken into consideration. As a result, as described above, even if the set water amount Q of the water is changed by the user water amount setting means 9, the duty value D can be promptly and appropriately responded.

  Further, when the correction temperature T′in of the water before heating detected by the heater inlet temperature sensor 6 changes, the control constant changing means 207 relates to the proportional gain KP according to the change of the correction temperature T′in. An adjustment ratio α1 and an adjustment ratio α2 related to the integral gain KI are respectively obtained. Then, the control circuit 10 adjusts the duty value D (control amount) according to the adjustment ratio α1 and the adjustment ratio α2. As a result, even if the correction temperature T′in of the water before being heated changes due to a change in season or the like, the duty value D can be quickly and appropriately responded, and the temperature of the hot water is prevented from exceeding.

  Furthermore, according to this embodiment, as can be understood from FIG. 10, the control circuit 10 uses the previous value D ′ of the duty value stored in the second storage element 162 (a predetermined area of the memory 16) as a basis. The previous duty value D ′ of the duty value and the total manipulated variable Ht are added to obtain the current duty value D. For this reason, the calculation time by the control circuit 10 is shortened compared with the case where the previous value D ′ of the duty value is not used. Therefore, when there is a change in the set water amount Q or a change in the correction temperature T′in of the water before it is heated, the duty value D of the current flowing to the heater 3 can be made to respond more quickly. Can increase the responsiveness.

  Further, according to this embodiment, as can be understood from FIG. 10, the control circuit 10 is based on the previous value ε ′ of the temperature deviation ε stored in the first storage element 161 (a predetermined area of the memory 16). The calculation unit 114 obtains the difference Δε between the current value of the temperature deviation ε and the previous value ε ′ of the temperature deviation. Then, the first manipulated variable H1 is obtained according to the multiplication of Δε and the proportional gain KP. For this reason, compared with the case where the previous value ε ′ of the temperature deviation ε is not used, the calculation time by the control circuit 10 is shortened. Therefore, when there is a change in the set water amount Q or a change in the measured temperature Tin of the water before being heated, the duty value D of the current supplied to the heater 3 can be made to respond more quickly, and the response of the heater 3 The temperature of the hot water for washing the local area is made appropriate.

  Example 4 of the present invention will be specifically described. The present embodiment basically has the same configuration and the same function and effect as the first embodiment. According to the present embodiment, the target temperature of the hot water set by the user temperature setting means is Tset [° C.], the corrected temperature of the water detected by the heater inlet temperature sensor 6 is T′in [° C.], and the amount of user water When the set amount of water set by the setting means 9 is Qset [ml / min] and γ is a set value, the control circuit 10 (control means), for example, determines the duty value based on the following equation (A): D (heater power physical quantity) can be obtained.

{(Tset−T′in) × Qset] × γ} (where γ is a real number) (A)
Further, feedback control is performed so that the correction temperature T′out of the heater outlet temperature sensor 7 matches the target temperature Tset of the hot water.

  Also in this embodiment, the measured temperature Tout is corrected by adding the correction constant τ1 to the measured temperature Tout measured by the heater outlet temperature sensor 7, and the corrected temperature T′out is obtained. Further, the corrected temperature T′in is obtained by correcting the measured temperature Tin by adding the correction constant τ2 to the measured temperature Tin measured by the heater inlet temperature sensor 6. The set value γ can be appropriately set based on experiments or the like, and may be a fixed value or a variable value, and includes an integer, a fraction, and a number with a decimal point.

  According to the present embodiment, since the measured temperature Tin is corrected by adding the correction constant τ2 to the measured temperature Tin measured by the heater inlet temperature sensor 6, the corrected temperature T′in is obtained. The duty value D is optimized based on the formula (A), and the temperature of the warm water for cleaning the local part is optimized.

(Other examples)
In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the scope of the invention. For example, according to each of the above-described embodiments, the heater power physical quantity to be supplied to the heater 3 is changed by supplying a current to the heater 3 in a pulse manner and changing the duty value D of the current. However, the present invention is not limited to this, and a direct current may be continuously supplied to the heater 3 and the current value may be appropriately increased or decreased.

  INDUSTRIAL APPLICABILITY The present invention can be used in an instantaneous hot water supply type temperature control device that quickly heats water used for local cleaning in a shower toilet that cleans local parts such as a human body.

It is a perspective view of the shower toilet concerning Example 1 carrying a temperature control device. 1 is a block diagram of a temperature control device according to Embodiment 1. FIG. It is a block diagram which shows the state (Without correction | amendment process and with a correction | amendment process) which supplies water of 10 degreeC to a water supply channel, and is measuring water temperature with a heater inlet temperature sensor and a heater outlet temperature sensor. It is a block diagram which shows the state (no correction | amendment process) which supplies water of 10 degreeC to a water supply path, heats water with a heater, and measures water temperature with a heater inlet temperature sensor and a heater outlet temperature sensor. It is a block diagram which shows the state (with correction | amendment process) which supplies 10 degreeC water to a water supply channel, heats water with a heater, and measures water temperature with a heater inlet temperature sensor and a heater outlet temperature sensor. It is a graph explaining the variation in the measurement temperature of a temperature sensor. It is a graph explaining variation in measurement temperature when two temperature sensors are used. 5 is a flowchart of correction constant setting processing executed by a control circuit according to the first embodiment. 4 is a flowchart of hot water generation processing executed by the control circuit according to the first embodiment. FIG. 10 is a block diagram illustrating control contents executed by a control circuit according to a third embodiment.

Explanation of symbols

  100 is a toilet bowl, 101 is an operation panel, 102 is a base, 103 is a nozzle (warm water discharge section), 104 is a toilet seat, 105 is a toilet lid, 1 is a water supply channel, 3 is a heater, 4 is a water amount changer, and 6 is a heater inlet Temperature sensor (heater inlet temperature detecting means), 7 a heater outlet temperature sensor (heater outlet temperature detecting means), 8 a user temperature setting means (warm water temperature setting means), 9 a user water amount setting means, 10 a control circuit (control) Means), 11 is a duty value generating circuit, 14 is a CPU, 16 is a memory (storage element), 161 is a first storage element, and 162 is a second storage element.

Claims (15)

A heater that heats the water flowing through the water supply channel to clean the local area of the human body;
A hot water discharger that discharges water heated by the heater toward a local part of the human body;
Hot water temperature setting means for setting a target temperature Tset of hot water discharged from the hot water discharge section;
A heater inlet temperature detection means for detecting the temperature of water before being heated by the heater;
Heater outlet temperature detection means for detecting the temperature of hot water after being heated by the heater;
In a temperature control device for a shower toilet comprising a control means for controlling the heater,
The control means includes
When the heater is not heated, the heater inlet temperature detecting means detects the measured temperature Tin and the heater outlet temperature detecting means detects the measured temperature Tout,
When the difference ΔT exists between the measured temperature Tout and the measured temperature Tin, the correction for the heater outlet temperature detection means so that the measured temperature Tout approaches the virtual true value Tvir between the measured temperature Tout and the measured temperature Tin. Correction constant setting means for setting the constant τ1;
Correction means for executing a correction process in which a value obtained by adding a correction constant τ1 to the measured temperature Tout of the heater outlet temperature detection means is used as the correction temperature of the heater outlet temperature detection means;
Control amount setting for setting the control amount for the heater so that the target temperature Tset of the hot water set by the hot water temperature setting means corresponds to the correction temperature of the heater outlet temperature detection means corrected by the correction means Means for controlling the temperature of an instant hot water type shower toilet. 2. The correction constant setting means according to claim 1, wherein the correction constant setting means is a virtual true value between a measured temperature Tin of the heater inlet temperature detecting means and a measured temperature Tout of the heater outlet temperature detecting means when the heater is not heated. Find the value Tvir and
Instantaneous hot water supply, wherein a value obtained by subtracting the measured temperature Tout of the heater outlet temperature detection means from the virtual true value Tvir is multiplied by a predetermined ratio as a correction constant τ1 for the heater outlet temperature detection means -Type shower toilet temperature control device. 3. The correction constant setting means according to claim 2, wherein a value obtained by multiplying a value obtained by subtracting the measured temperature Tin of the heater inlet temperature detecting means from the virtual true value Tvir by a predetermined ratio is used for the heater inlet temperature detecting means. The correction constant τ2 of
The correction means sets a value obtained by adding a correction constant τ2 to the measured temperature Tin of the heater inlet temperature detection means as the correction temperature of the heater inlet temperature detection means when the heater is heating. A temperature control device for instant hot water shower toilets. In claim 1, the temperature variation of the heater outlet temperature is set smaller than the temperature variation of the heater inlet temperature,
The correction constant setting means weights the measured temperature Tout of the heater outlet temperature detecting means when the heater is not in a heating operation more than the measured temperature Tin, and the measured temperature Tin of the inlet temperature detecting means and the A virtual true value Tvir existing between the measured temperature Tout of the heater outlet temperature detection means and
Instantaneous hot water supply, wherein a value obtained by subtracting the measured temperature Tout of the heater outlet temperature detection means from the virtual true value Tvir is multiplied by a predetermined ratio as a correction constant τ1 for the heater outlet temperature detection means -Type shower toilet temperature control device. 5. The correction constant setting means according to claim 4, wherein a value obtained by multiplying a value obtained by subtracting the measured temperature Tin of the heater inlet temperature detecting means from the virtual true value Tvir by a predetermined ratio is used for the heater inlet temperature detecting means. The correction constant τ2 of
The correction means sets a value obtained by adding a correction constant τ2 to the measured temperature Tin of the heater inlet temperature detection means as the correction temperature of the heater inlet temperature detection means when the heater is heating. A temperature control device for instant hot water shower toilets.   6. The control unit according to claim 1, wherein when the heater is not heated, the control unit measures the measured temperature Tin of the heater inlet temperature detecting unit and the measured temperature Tout of the heater outlet temperature detecting unit. A temperature control device for an instantaneous hot water type shower toilet, characterized by having an alarm means for outputting an alarm signal or limiting the heat generation of the heater when the difference ΔT is greater than a predetermined value . The correction constant setting unit according to any one of claims 1 to 6, wherein the correction constant setting means is set immediately before a cleaning process in which a user cleans a local area with hot water discharged from the hot water discharge unit, immediately after the cleaning process, When at least one of the following conditions is satisfied when sitting on the toilet seat, when the user is not seated on the toilet seat, or when the user is at night:
A temperature control device for an instantaneous hot water type shower toilet, wherein a correction constant setting process for setting the correction constant is executed under a condition in which the heater does not generate heat.   8. The hot water temperature setting means according to claim 1, wherein a user or the control means sets a target temperature Tset of hot water discharged from the hot water discharge section. Temperature control device for instant hot water shower toilet. In any one of Claims 1-8, the said control means is
A temperature deviation ε between the target temperature Tset of the hot water set by the hot water temperature setting means and the correction temperature T′out of the hot water detected by the heater outlet temperature detection means is obtained, and is set by the user water amount setting means. A control constant is set according to a set water amount of water and / or the temperature deviation ε, a control amount for the heater is set according to the set water amount, the temperature deviation, and the control constant, and
A temperature control device for an instantaneous hot water type shower toilet, wherein the control amount or the control constant is adjusted in accordance with a correction temperature of water before being heated detected by the heater inlet temperature detection means.   10. The temperature control device for an instantaneous hot water shower toilet according to claim 9, wherein the control constants are a proportional gain and an integral gain.   11. The temperature control of the instantaneous hot water type shower toilet according to claim 10, wherein the proportional gain and the integral gain are set to increase when the set water amount set by the user water amount setting means increases. apparatus.   12. The control means according to claim 10, wherein the control means increases the proportional gain when the temperature of the water before heating detected by the heater inlet temperature detection means becomes low, and the temperature of the water before heating is increased. A temperature control device for an instant hot water type shower toilet, wherein the proportional gain is reduced when the temperature becomes high.   In any one of Claims 10-12, when the temperature of the water before the heating detected by the said heater inlet temperature detection means becomes low temperature, the said control means will increase the said integral gain, and will be heated. The temperature control device for an instant hot water type shower toilet, wherein the integral gain is reduced when the temperature of water before the water reaches a high temperature. In any one of Claims 9-13, the 1st storage element which memorizes the heater electric power physical quantity energized to the heater is provided,
The control means updates the heater power physical quantity every predetermined time,
Obtaining a temperature deviation between the target temperature of the hot water set by the hot water temperature setting means and the temperature of the hot water detected by the heater outlet temperature detecting means;
A total operation amount based on the physical quantity related to the temperature deviation obtained this time and the control constant is obtained, and based on the previous heater power physical quantity stored in the first storage element, the previous heater power physical quantity and the total operation obtained this time are calculated. The temperature control device for the instant hot water type shower toilet, wherein the physical quantity of the heater is updated by adding the amount. In any one of Claims 10-14, the 2nd storage element which memorize | stores the said temperature deviation is provided,
The control means obtains a difference between a previous temperature deviation stored in the second storage element and a temperature deviation obtained this time, and obtains an operation amount according to the difference and a proportional gain of the proportional element. A temperature control device for instant hot water shower toilets.

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