JPS63149711A - Hot water/cold water mixing controller - Google Patents

Abstract

PURPOSE:To prevent the generation of excess overshooting by referring a control rule in the 1st control rule storing means on the basis of a temperature deviation at the time of detecting the completion of dead water discharge by means of a dead water completion detecting means and executing control inference to determine the controlling capacity of a mixing means 10 and its controlling direction. CONSTITUTION:A mixing ratio is corrected on the basis of a temperature deviation between a mixed hot water temperature detected by a mixed hot water temperature detecting means 11 at the time of starting hot water supply and a set value of a hot water temperature setting means 12 to control the mixing means 10. At the time of detecting the completion of cold water discharge by means of the dead water completion detecting means 18, the 1st switching means 19 is switched to the 1st control rule storing means 21, the 2nd switching means is switched to a control inferring means 23, and while referring the control rule in the means 21 on the basis of the temperature deviation obtained by the means 12, 11, inference processing is executed by the means 23 to determine the controlling direction and controlling capacity of the means 10 and control the means 10. When the mixed hot water temperature reaches a steady state by a steady state detecting means 24, the 1st means 21 is switched to the 2nd control rule storing means 22.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hot water mixing control device that mixes high temperature hot water and cold water to produce suitable temperature hot water for use in showers, wash basins, or for filling bathtubs.

2. Description of the Related Art A conventional hot water mixing control device is disclosed in, for example, Japanese Patent Application Laid-open No. 112-1983.
As shown in Publication No. 879, it had a structure as shown in FIG. In FIG. 7, a water side valve 3 and a hot water side valve 4 are installed in the middle of a water side piping 1 and a hot water side piping 2, and the valve opening is controlled by a water side drive unit 5 (for example, a motor, etc.) and a hot water side drive unit 6. Adjust. The water side pipe 1 and the hot water side pipe 2 merge to form a single mixing pipe 7, and a temperature sensor 8 detects the temperature of the mixed water.
I'm happy with the setting. Temperature sensor 8 (therminuta etc.)
The output section is connected to the control section 9 so as to process the signal and output the operation amount to the water side drive section 6 and the hot water side drive section 6.

Next, the operation of the conventional configuration will be explained. FIG. 6 shows the relationship between the signal from the temperature sensor 8 and the amount of energization of the water side drive section 5 or the hot water side drive section 6, and FIG. 7 is a flowchart showing the operation of the control section 9. As shown in FIG. 7, after setting the set temperature, the water side drive section 5 opens the water side valve 3 to the initial position.

Next, the control section 9 outputs an output to the hot water side drive section 6, and the hot water side valve 4 is turned on. Then, a temperature sensor 8 provided in the mixing pipe 7 detects the temperature of the mixed water and compares it with the set temperature. If the deviation between the set temperature and the hot water outlet temperature is outside the allowable range of ±0.5°C, the water side valve 3 is controlled to open or close at a speed proportional to the absolute value of the temperature deviation. If the deviation of the tapped water temperature from the set temperature falls within an allowable range, the water side valve 3 is stopped. FIG. 6 is a diagram in which the horizontal axis shows the temperature detected by the thermosensor 8, and the vertical axis shows the valve opening/closing speed (angular velocity of 7 seconds).

Problems to be Solved by the Invention However, in such a hot water mixing device, if hot water is not used for a long time after hot water is supplied, the hot water temperature in the hot water side pipe 2 drops to the ambient temperature or water temperature (hereinafter referred to as dead water). ),
When the cooled hot water is discharged from the mixing pipe 7, the hot water temperature far exceeds the set temperature. This is based on the following reasoning.

That is, since cooled hot water is supplied to the hot water side valve 4, the outlet temperature is much lower than the set temperature, so the water side drive unit 6 drives the water side valve 3 in a direction to close the valve opening. When this cooled hot water is exhausted, the temperature of the hot water gradually rises.

However, since the water side valve 3 is adjusted in the closing direction until the outlet temperature reaches the set temperature, the water side valve 3 may be in a fully closed state. When the hot water temperature exceeds the set temperature, the water side valve 3 starts to be adjusted in the direction of opening. As a result, hot water will come out before the valve reaches the set temperature. Therefore, when a user tries to take a shower and waits for all the cold water to run out, the temperature of the water begins to rise, and when the user uses the shower, he or she is suddenly bathed in boiling water, which is extremely dangerous and has a negative impact on human life.

The present invention has been made in view of these points, and provides a safe and easy-to-use hot water mixing control device that quickly dispenses cooled hot water and further controls the dispensed water temperature to a set temperature even if the supplied hot water temperature changes rapidly. provide.

Means for Solving the Problems In order to solve the above problems, the present invention provides a mixing means for adjusting the mixing ratio of hot water, a mixed water temperature detecting means for detecting the supplied water temperature and the mixed water temperature, and a mixed water temperature detecting means for detecting the mixed water temperature. A hot water temperature setting means for setting, a supply water temperature estimating means for estimating the supply water temperature, a mixing ratio calculation means for calculating a mixing ratio between the supply water temperature and the supply water temperature from a set temperature, and a deviation calculation means for calculating a temperature deviation. and a mixing ratio correction means for correcting the mixing ratio based on the temperature deviation.
energization amount setting means for adjusting the mixing means based on the corrected mixing ratio; dead water completion detection means for detecting completion of discharge of dead water; and steady state detecting that the mixed water temperature has reached a steady state. a detection means, a first control rule storage means for storing a control rule during dead water, and a second control rule storage means for storing a control rule during a steady state.
a control rule storage means, a first switching means for switching the output of the first or second control rule storage means, and an inference process based on the temperature deviation signal and the first or second control rule storage means; The control inference means determines the adjustment amount of the mixing means, and the second switching means switches the output section of the energizing amount setting means or the control inference means.

Operation The mixing ratio is determined from the supplied hot water temperature estimating means at the start of hot water supply, the hot water temperature setting means, and the mixed hot water temperature detecting means, and the mixing means is adjusted. At this time, the mixing ratio is corrected based on the temperature deviation between the mixed water temperature detected by the mixed water temperature detection means and the set value of the hot water temperature setting means, and the mixing means is adjusted. Next, when the completion of cold water dispensing is detected by the dead water completion detection means, the first switching means is switched to the first control rule storage means, and the second switching means is switched to the control reasoning means. Based on the temperature deviation obtained from the hot water temperature setting means and the mixed hot water temperature detecting means, the control rule in the first control rule storage means is referred to, and the control inference means further performs inference processing to determine the direction and amount of adjustment of the mixing means. and adjust the mixing means. Then, when the mixed water temperature reaches a steady state according to the steady state detecting means, the control is switched to the second control rule storing means.

In this way, even if cold hot water is supplied to the mixing means, hot water can be quickly discharged and the temperature of the mixed hot water can be stabilized without causing a large overshoot.
By switching from the control rule to the second control rule, the mixed water temperature can be stably adjusted.

Embodiment An embodiment of the present invention will be described with reference to the drawings. Components equivalent to those in FIGS. 1 and 4 are given the same numbers.

In FIG. 1, reference numeral 10 denotes a mixing means for adjusting the mixing ratio of the amount of hot water. Reference numeral 11 denotes a mixed hot water temperature detection means that detects the supplied water temperature and the hot water temperature after mixing. Reference numeral 12 denotes a hot water temperature setting means for setting the mixed hot water temperature. FIG. 2 is a block diagram showing one embodiment of the control device 9.

Reference numeral 1a denotes a supplied hot water temperature setting means for estimating the supplied hot water temperature, and 14 denotes a mixing ratio calculating means for calculating the mixing ratio from the mixed hot water temperature detecting means 11, the hot water temperature setting means 12, and the supplied hot water temperature estimating means 13. Reference numeral 15 denotes a deviation calculating means which calculates a temperature deviation from the mixed hot water temperature detecting means 11 and the hot water temperature setting means 12. Reference numeral 16 denotes a mixing ratio correcting means, which corrects the mixing ratio based on the obtained temperature deviation.

Reference numeral 17 denotes an energizing amount setting means which adjusts the mixing means 10 based on the corrected mixing ratio. Reference numeral 18 denotes dead water completion detection means, which detects the completion of dispensing of dead water based on the slope of the output signal of the mixed hot water temperature detection means 11 or the deviation calculation means 15. 19 is a first switching means, 20 is a second switching means, and the dead water completion detection means 1
8, the first switching means 19 switches from the first control rule storage means 21 to the second control rule storage means 22, and the second switching means 20 switches the control inference from the energizing amount setting means 17. Switch to means 23. 24 is a steady state detection means, which detects whether the output of the deviation calculation means 15 becomes O or negative, or whether the mixed hot water temperature detection means 11 and the hot water temperature setting means 1
2 by comparison means 25, and it is detected from the output signal that the mixed water temperature has reached a steady state.

Next, the operation of the configuration of the present invention will be explained. FIG. 3 is a flowchart showing the operation of the hot water mixing control device of the present invention.

First, a mixing ratio is determined from the supplied water temperature at the start of hot water supply, the supplied water temperature, and the hot water temperature setting value, and the mixing ratio is
Adjust 0. Next, the mixed hot water temperature detection means 11 detects the outlet temperature, and in order to eliminate the temperature deviation from the set temperature, the mixing means 10 is adjusted while correcting the mixing ratio based on the determined temperature deviation. As a result, even if dead water is supplied to the mixing means 10, hot water can be quickly tapped. The steps are Pl, P2, P3, P4, P5, P6, and P7 in the flowchart of FIG.

When the dead water completion detecting means 18 detects the completion of the discharge of dead water, the first switching means 19 is set to the output section of the first control rule storage means 21, and the second switching means is set to the energizing amount setting means 1.
7 to the control reasoning means 2a. The first control rule storage means 21 stores the relationship between the temperature deviation during dead water and the adjustment amount of the mixing means 1o as a control rule using control variables. The second control rule storage means 22 stores the relationship between the temperature deviation during steady state and the adjustment amount of the mixing means 10 as a control rule. Based on the obtained temperature deviation, control reasoning is performed with reference to the control rules in the first control rule storage means 21 to determine the adjustment direction and adjustment amount of the mixing means, and the mixing means 1o
Adjust. These are P8 and P9 of the flowchart in FIG.

Next, the steady state detection means 24 detects whether the mixed water temperature has reached the set temperature. This is determined by the output of the temperature deviation or by comparing the mixed hot water temperature and the set temperature by the comparing means 25. When the steady state detection means 24 detects that the mixed water temperature has reached a steady state, the first switching means 19 is switched from the first control rule storage means 21 to the second control rule storage means 22.
Switch to. Plo and pl 1- in FIG. As a result, there is no overshoot in the dead water special hot water temperature, and when a steady state is reached, the hot water temperature can be kept stable at all times by switching to the normal control rule. Figure 4 shows the results.

Effects of the Invention As described above, according to the hot water mixing control device of the present invention, the mixing ratio calculation means calculates the mixing ratio from the supplied water temperature, the supplied hot water temperature, and the set temperature, adjusts the mixing means, and sets the mixed water temperature. In order to adjust the temperature, the temperature deviation is determined by the deviation calculating means, the mixing means is adjusted while correcting the mixing ratio based on the determined temperature deviation, and then the determined temperature deviation is determined by the dead water completion detection means when the completion of dead water discharge is detected. Based on this, control rules are referred to in the first control rule storage means to perform control reasoning, determine the amount and direction of adjustment of the mixing means, adjust the mixing means, and detect the steady state of the mixed water temperature. When it is detected that a steady state has been reached, the cold water supplied to the mixing means is rapidly discharged by switching to the second control rule storage means.
In addition, after the dead water is discharged, the mixed water temperature does not cause an excessive overshoot, and when a steady state is reached, the mixed water temperature can be controlled stably by switching to the steady state control rule without endangering human life. It is safe, easy to use, and effective.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a hot water mixing control device according to an embodiment of the present invention, Fig. 2 is a control block diagram of the device, Fig. 3 is a flowchart showing the operation of the device, and Fig. 4 is a system diagram of the device. FIG. 6 is a system diagram of a conventional hot water mixing control device, FIG. 6 is a characteristic diagram of the device, and FIG. 7 is a marow chart diagram of the device. 10... Mixing means, 11... Mixed water temperature detection means, 12... Hot water temperature setting means, 13...
... Supply hot water temperature estimation means, 14 ... Mixing ratio calculation means, 16 ... Deviation calculation means, 16 ...
. . . Mixing ratio correction means, 17 . . . Force setting means, 18 . . . Dead water completion detection means, 19 . . .
...First switching means, 20...Second switching means, 21...First control rule storage means, 22...
. . . second control rule storage means, 23 . . . control inference means, 24 . . . steady state detection means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure - Li1%/L ~ Figure 3 Figure 4 Figure 5

Claims (3)

[Claims] (1) Mixing means for adjusting the mixing ratio of high temperature hot water and water;
Mixed hot water temperature detection means for detecting the supply water temperature and the temperature of hot water after mixing by the mixing means, hot water temperature setting means for setting the mixed hot water temperature, and supply hot water temperature estimation for estimating the hot water temperature supplied to the mixing means. a mixing ratio calculating means for calculating a mixing ratio from the supplied hot water temperature estimating means, the hot water temperature setting means and the mixed hot water temperature detecting means; and a temperature deviation from the hot water temperature setting means and the mixed hot water temperature detecting means. a deviation calculating means for calculating the mixing ratio; a mixing ratio correcting means for correcting the mixing ratio using an output signal of the deviation calculating means; an energizing amount setting means for energizing the mixing means from the output signal of the mixing ratio correcting means; dead water completion detection means for detecting the completion of hot water dispensing; steady state detection means for detecting when the mixed hot water temperature has reached a set temperature; and a control rule based on the relationship between the temperature deviation at the time of dead water and the adjustment amount of the mixing means. a first control rule storage means for storing a control rule in a steady state; a second control rule storage means for storing a control rule in a steady state; a first switching means for switching the output of the control rule storage means; a control inference means for performing inference processing from the deviation calculation means and the first or second control rule storage means to determine an adjustment amount of the mixing means; A hot water mixing control device comprising a second switching means that switches to the output section of the energizing amount setting means or the control inference means in response to the output signal of the dead water completion detection means. (2) The hot water mixing control device according to claim 1, wherein the dead water completion detection means detects the completion of discharge of dead water based on the slope of the output signal of the mixed hot water temperature detection means or the deviation calculation means. (3) The steady state detection means detects that the mixed water temperature has reached the steady state based on the output signal of the comparison means that compares the deviation calculation means or the hot water temperature setting means and the mixed water temperature detection means. A hot water mixing control device according to claim 1.