JPH0650451B2 - Hot water mixing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hot and cold water mixing apparatus that controls the temperature of hot water by changing the mixing ratio of hot water and water by means of a valve, and in particular, the opening and closing speed of the valve is mixed. The present invention relates to a hot and cold water mixing device that determines a hot water temperature according to a deviation between a hot water temperature of a hot water and a set target hot water temperature.

(Prior Art) As is well known, a hot and cold water mixing apparatus controls the mixing ratio of hot water and water by a valve to supply hot water of a predetermined temperature to a currant or the like. In order to improve the above, a method of changing the opening / closing speed of the valve has been proposed.

As a hot and cold water mixing device in which the opening and closing speed of this type of valve is variable, a valve that can be conventionally specified in accordance with a deviation between a set target temperature (target hot water temperature) and the temperature of hot water to be supplied (actual hot water temperature) ROM with two kinds of data of opening / closing speed as control characteristics
There is a configuration in which the valve opening / closing speed is stored in a storage device such as the above, a control characteristic is selected such that the rate of change of the valve opening / closing speed is small, and the valve opening / closing speed is determined according to the deviation according to the control characteristic.

(Problems to be Solved by the Invention) However, in the hot and cold water mixing apparatus in which the valve opening / closing speed is variable as described above, the control characteristic is limited to one having a low gain of the valve opening / closing speed. To choose
If the deviation is large during pressure fluctuation, a sufficiently high opening / closing speed cannot be obtained, and there is a problem that the time required for the actual hot water temperature to reach the target hot water temperature becomes long.

On the other hand, in order to solve the above problems, it is possible to change the slope of the gain to increase the opening / closing speed of the valve in the high deviation range. However, increasing the opening / closing speed increases the gain even in the low deviation range close to the set temperature. Therefore, there is a new problem that hunting in which the actual hot water temperature fluctuates with respect to the target hot water temperature is likely to occur.

The present invention has been made in view of the above-mentioned problems, and when the pressure changes, the control characteristic having a large gain is selected and is performed based on the deviation between the actual hot water temperature and the target hot water temperature, but the positive / negative of the deviation is reversed. It is an object of the present invention to provide a hot and cold water mixing device that sometimes selects a control characteristic with a small gain to reduce the valve opening / closing speed, shorten the time to reach the target hot water temperature, and prevent the occurrence of hunting.

(Means for Solving Problems) The present invention connects a hot water supply pipe to which hot water is supplied and a water supply pipe to which water is supplied to a mixed water pipe so that hot water and water can be mixed, and the hot water supply pipe and the water supply pipe are respectively connected. A hot water supply valve and a water supply valve capable of adjusting the flow rates of hot water and water are provided in tandem, and when the pressure fluctuation occurs, the hot water temperature in the mixed water pipe is detected and based on the deviation between the hot water temperature and the set hot water temperature. Select one from a plurality of valve opening / closing speed control characteristics with different gains stored in advance,
A valve opening / closing speed is determined according to the deviation according to the selected valve opening / closing speed control characteristic, and the hot water supply valve and the water supply valve are driven at the determined valve opening / closing speed to control the hot water temperature in the mixed water pipe. In the hot and cold water mixing device, when the deviation is reversed by driving the hot water supply valve and the water supply valve at a valve opening / closing speed determined according to one valve opening / closing speed control characteristic, the deviation is smaller than the one valve opening / closing speed control characteristic. The gist is that it is configured to select another valve opening / closing speed control characteristic of gain.

(Operation) According to the hot and cold water mixing apparatus according to the present invention, the valve opening / closing speed control characteristic having a large gain is selected when the pressure fluctuation occurs, and the valve is driven at a large valve opening / closing speed. The valve opening / closing speed control characteristic of gain is selected to reduce the valve opening / closing speed. Therefore, the target hot water temperature can be quickly reached when the pressure fluctuates, and hunting is prevented.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 4 show a hot and cold water mixing apparatus according to an embodiment of the present invention, FIG. 1 is an overall configuration diagram, FIGS. 2 and 3 are flowcharts, FIG. 4 is a timing chart,
FIG. 5 is a data table.

In FIG. 1, (11) is a hot water supply pipe to which relatively high temperature hot water is supplied, (12) is a water supply pipe to which relatively low temperature water is supplied, (13)
Is a hot water supply valve that controls the flow of hot water in the hot water supply pipe (11), (14)
Is a water supply valve that adjusts the flow rate of water in the water supply pipe (12) in conjunction with the hot water supply valve (13), and (15) mixes the hot water that has passed through the hot water supply valve (13) with the water that has passed through the water supply valve (14). And (18) is a temperature sensor that detects the temperature of the mixed water in the mixing water pipe (15) (actual hot water temperature), and (19) is the setting of the target hot water temperature (T0). And an operating device for issuing commands such as driving / stopping of the device, (20)
Is a controller composed of a one-chip microcomputer having a CPU, a ROM, etc., and controls the operation of the operation device (19) and control based on the output signal of the temperature sensor (18), and (21) is a drive circuit, a motor, etc. Is a driver for driving the valves (13), (14) based on the output signal of the controller (20). Controller (2
The ROM of the one-chip microcomputer of 0), identify the opening and closing speed of the valve (R) in accordance with the deviation (Delta] t) of Jitsuyu temperature as shown in FIG. 5 and (T _M) and the target YuAtsushi (T0) Two possible control characteristics (A) and (B) are stored. Needless to say, three or more control characteristics can be stored in the ROM. The controller (20) corresponds to a storage means, a selection means, a holding means, and a speed determination means.

This hot and cold water mixing apparatus controls the actual hot water temperature by executing a series of processes shown in the flowcharts of FIGS. 2 and 3.
In addition, although specific numerical values are described for the hot water temperature and the like for the sake of simplicity, it goes without saying that other numerical values can be appropriately set.

This control is performed by the main routine of FIG. That is, first, in step (P ₁ ), a flag (F
1) Perform initialization such as initial value setting of (F2) (F3). In this initialization, the flag (F1) is set to 1, the flag (F2) is set to 0, and the control characteristic (K) is initialized to the characteristic (B) having a small gain. Then, in the next step (P ₂ ), the actual hot water temperature (T
Input processing such as reading _M ), and the following step (P ₃ )
Correct the actual hot water temperature (T _M ) read in. Thereafter, in step (P _4), and calculates a deviation ([Delta] T) of Jitsuyu temperature and (T _M) and the target YuAtsushi (T _0), described later in the next step (P ₅₎ (3
As shown in the figure), the control characteristics (A) and (B) are selectively controlled, and based on the control characteristics (K) selected in the subsequent step (P ₆ ), the valve opening / closing speed (R) is changed from the deviation (ΔT). ) Is searched for a map, and output processing such as driving of a motor for opening and closing the valves (13) and (14) is performed in the subsequent step (P ₇ ).

The selection control of the control characteristic (K) is performed by a series of processes shown in FIG. First, in step (Q ₁ ), it is determined whether the flag (F 1) is 1, and if the flag (F 1) is 1, step
Proceed to (Q ₉ ), and if the flag (F 1) is 0, proceed to step (Q ₂ ). The absolute value of deviation (| ΔT |) of this flag (F1) is 0.
When the temperature below 5 ° C continues for a certain time (t ₀ ) (hereinafter,
0 is set to the stable hot water discharge state). Next steps
At (Q ₂ ), it is judged whether or not the flag (F 2) is 1, and if the flag (F 2) is 1, the process proceeds to step (Q ₁₃ ), and the flag (F 2)
If is 0, proceed to step (Q ₃ ). This flag (F2)
1 is set when the absolute value of deviation (| ΔT |) exceeds 2 [° C.] due to pressure fluctuations due to opening and closing of other valves.

In step (Q ₃ ), the deviation (ΔT) (ΔT = T ₀ −
T _M ) exceeds 2 [° C], and if the deviation (ΔT) is 2 [° C] or less, proceed to step (Q ₄ ).
Deviation ([Delta] T) is set to 0 in the flag (F3) in it exceeds the 2 [° C.] Step (Q _5). Similarly, the following steps (Q ₄ )
In the deviation _{(ΔT) (ΔT = T 0} -T M) -2
It is judged whether it is smaller than [° C] and the deviation (ΔT) is 2
If it is equal to or higher than [° C], a series of processing is repeatedly executed, but if the deviation (ΔT) is smaller than -2 [° C], step
Set the flag (F3) to 1 with (Q ₆ ). This flab (F3) is
The deviation (ΔT) is set to 0 when it is positive and the deviation (ΔT) is set to 1 when it is negative, and indicates whether the deviation (ΔT) is positive or negative. In the next step (Q ₇ ), 1 is set in the flag (F 2), and in the subsequent step (Q ₈ ), a large gain characteristic (A) is set in the control characteristic (K). That is, when the deviation (ΔT) is large due to pressure fluctuation or the like, the flag (F2) is set to 1, and the large gain characteristic (A) is set to the control characteristic (K). Therefore, the valve opening / closing speed R) also increases, and the actual hot water temperature (T _M ) can quickly reach the target hot water temperature (T ₀ ).

In step (Q ₉ ), the absolute value of deviation (| ΔT |)
0.5 [° C.] whether or less, in other words the actual hot water (T _M) is determined whether the host vehicle has reached the target YuAtsushi (T _0), the absolute value (| [Delta] T
|) Is judged to exceed 0.5 [° C], the step
At (Q ₁₀ ), the stability timer (St) is reset to start the time measurement for the specified time (t ₀ ), and if the absolute value (| ΔT |) is 0.5 [° C] or less, it becomes stable at step (Q ₁₁ ). Judges whether the timer (St) has completed timing. And this step (Q ₁₁ )
For the stable timer (St) is set to 0 in the flag (F1) in the judged complete counting step (Q _12), counting is repeatedly executed again series of processes if not completed. That is, when Jitsuyu temperature (T _M) is a state that has reached the target YuAtsushi (T ₀₎ is continued stabilization timer (S _t) to the set time (t _0), is determined to be in a stable pouring state flag 0 is set in (F1).

In step (Q ₁₃ ), the deviation (ΔT) (ΔT =
T ₀ −T _M ) is positive or negative, and if the deviation (ΔT) is negative, the process proceeds to step (Q ₁₄ ) to determine the value of the flag (F3), and similarly, the deviation (ΔT) is positive or negative. If 0, step
Proceed to (Q ₁₅ ) and determine the value of the flag (F3). Then, when it is determined that the flag (F3) is 1 in step (Q ₁₄ ), and when it is determined that the flag (F3) is 0 in step (Q ₁₅ ), a series of processing is performed again. When the flag (F3) is determined to be 0 in step (Q ₁₄ ) and the flag (F3) is determined to be 1 in step (Q ₁₅ ), Step (Q ₁₆ ) (Q ₁₇ ) (Q ₁₈ ) (Q ₁₉ )
The processing of 1 is sequentially executed. In these steps (Q ₁₆ ), 1 is set in the flab (F 1), 0 is set in the flag (F 2) in step (Q ₁₇ ), and a small gain characteristic (K) is set in the control characteristic (K) in step (Q ₁₈ ). B) is set and the stability timer (St) is reset in step (Q ₁₉ ) to start timing. That is, the control characteristic (K) has a deviation (Δ
When T) becomes large, a large gain characteristic (A) is set, but thereafter, when the deviation (ΔT) becomes small and the positive and negative signs are inverted, a small gain characteristic (B) is set. Therefore, as shown in FIG. 4, the actual hot water temperature (T _M ) can be promptly converged to the target hot water temperature (T ₀ ) without causing hunting. For convenience, (A) and (B) in the lower column of FIG. 4 represent the selected control characteristic (K).

In the above-described embodiment, the ROM has two control characteristics.
Although (A) and (B) are stored, it goes without saying that three or more control characteristics can be stored. Further, as shown in FIG. 5, in the range where the deviation (ΔT) is minute (−0.5 <ΔT <0.5), it is optional to set the valve opening / closing speed (R) to zero to create a stable region.

(Effects of the Invention) As described above, according to the hot and cold water mixing apparatus of the present invention, the valve opening / closing speed control characteristic that increases the opening / closing speed of the valve at the time of pressure fluctuation is selected. Since the valve opening / closing speed control characteristic that reduces the opening / closing speed is selected and the control is shifted to the control based on this characteristic, the target hot water temperature can be quickly reached even when the pressure fluctuates or the like. It can be prevented from occurring.

[Brief description of drawings]

1 to 5 show a hot and cold water mixing apparatus according to an embodiment of the present invention, and FIG. 1 is an overall configuration diagram, FIG. 2 and FIG.
The figure is a flow chart, FIG. 4 is a timing chart, and FIG. 5 is a data table. 11 …… Hot water supply pipe, 12 …… Water supply pipe 13 …… Hot water supply valve, 14 …… Water supply valve 15 …… Mixed water pipe, 16 …… Karan 18 …… Temperature sensor, 19 …… Operator 20 …… Controller 21… … Driver

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hirofumi Takeuchi Inventor Hirofumi Takeuchi 2-1, 1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Inside Totoki Equipment Co., Ltd. (56)

Claims (1)

[Claims] 1. A drive means for driving a hot water supply valve for controlling the passage amount of hot water having a predetermined temperature and a water supply valve for controlling the passage amount of water by one axis or by two axes in conjunction with each other. A mixed water pipe capable of mixing a predetermined amount of hot water passing through the hot water supply valve and a predetermined amount of water passing through the water supply valve, a temperature detecting means for detecting the hot water temperature in the mixed water pipe, and this temperature detecting means Control means having a valve opening / closing speed control unit that determines the opening / closing speed of the hot water supply valve and the water supply valve according to a constant control characteristic based on the deviation between the detected temperature and the target temperature of the hot water temperature in the mixed water pipe. One of a plurality of valve opening / closing speed control characteristics with different gains stored in advance based on the deviation between the detected hot water temperature and the set target hot water temperature is selected, and the selected valve opening / closing speed control characteristic is selected. Therefore, in the hot and cold water mixing apparatus for determining the valve opening and closing speed according to the deviation, and driving the hot water supply valve and the water supply valve at the determined valve opening and closing speed to control the hot water temperature in the mixed water pipe, When the hot water supply valve and the water supply valve are driven at the valve opening / closing speed determined according to the valve opening / closing speed control characteristic and the deviation is reversed, another valve opening / closing speed control characteristic having a gain smaller than the one valve opening / closing speed control characteristic. A hot and cold water mixing device characterized by selecting.