JPS6337412A - Hot water and cold water mixer - Google Patents

Abstract

PURPOSE:To compensate the value speed to quickly approximate the actual temperature of hot water to a target temperature by correcting the signal of the detected tempera ture of hot water based on the change rate with time at the time of the variation of pressure to operate a temperature correction coefficient. CONSTITUTION:When the operation is started, flags F1 and F2 are initialized to set '1' and '0' to flags F1 and F2 respectively, and a correction coefficient TD is set to a constant C. An actual temperature TM of hot water in a mixing water pipe 15 is detected by a sensor 18 and is supplied to a CPU in a controller 20. The CPU computes a change rate dTM/dt with time of the actual temperature TM of hot water and determines the correction coefficient TD by a prescribed processing operation. The CPU calculates a corrected temperature TM' of hot water in accordance with a formula I based on said change rate dTM/dt with time and correction coefficient TD. Next, a deviation DELTAT' of the corrected temperature TM' of hot water from a target temperature TO is calculated, and an opening/closing speed R of a valve is retrieved in a map based on this deviation. Thus, the output processing like power supply to a motor of a valve driver 21 is performed and valves 13 and 14 are driven at the retrieved opening/closing speed R.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a hot water mixing device, and more specifically, it corrects the detected temperature based on its rate of change over time to correct a time delay in temperature control in a hot water mixing device, etc. This invention relates to a hot water mixing device that compensates for

(Prior Art) In a hot water mixing device that performs return control of the temperature of hot water, it is essential to detect the temperature of the hot water (water temperature) that is to be controlled. Conventionally, such a hot water mixing device detects the hot water temperature using a thermistor or the like, and controls the mixing ratio of hot water and water by driving a valve based on the detected hot water temperature.

(Problem to be solved by this invention) However,
In such conventional hot water mixing devices, the valve is driven based on the detected temperature, but the rate of change (gain) of the opening and closing speed of the valve is controlled.

Because it is limited to only one hot water temperature, if the hot water temperature fluctuates (jumps) due to hot water pressure fluctuations, it will not be able to follow this and the actual hot water temperature will not reach the target hot water temperature. There was a problem that it took a long time.

The present invention was made in view of the above-mentioned conventional problems, and provides a hot water mixing device that compensates the valve speed by correcting the detected hot water temperature signal, and quickly changes the actual hot water temperature to the target temperature when the pressure fluctuates. It is intended to be.

(Means for solving the problem) This invention mixes hot water and water by adjusting the mixing ratio with a valve, and detects the temperature of this mixed water.
A hot water mixing device that controls the temperature by driving a valve based on the detected temperature includes a detection means for detecting the temperature of the mixed water, and a time change rate of the temperature based on the output signal of the detection means. a differentiating means for calculating, a target temperature setting means for commanding a set temperature as a control target, and a difference between the temperature detected by the detection means and the set temperature commanded by the target temperature setting means. The object of the present invention is to include a deviation calculation means for calculating a deviation, and a correction coefficient setting means for setting a correction coefficient according to the sign or negative of the deviation calculated by the deviation calculation means and the time rate of change calculated by the differentiating means. shall be.

(Function) According to the hot water mixing device according to the present invention, responsiveness is improved by increasing or decreasing the correction of the temperature detected when the pressure fluctuates. When the actual hot water temperature deviates from the target temperature, the correction is increased and the valve opening/closing speed is increased.

Conversely, when approaching the target temperature, the correction is made smaller, the braking effect due to differentiation is reduced, and the temperature is quickly approached to the target temperature. After a certain period of time, normal correction is performed to stabilize without hunting. This improves responsiveness and allows it to follow fluctuations in water temperature, ensuring stability without hunting.

(Example) Embodiments of the present invention will be described below based on the drawings.

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

In Figure 1, (11) is a water supply pipe that supplies relatively high temperature water, (12) is a water supply pipe that supplies relatively low temperature water, and (13) is a water supply pipe that supplies hot water in hot water supply pipe (11). The water supply valve (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).
15) is the connection between the hot water that has passed through the hot water supply valve (13) and the water supply valve (1
(18) is a temperature sensor (detection means) that detects the temperature of the mixed water (actual water temperature) in the mixing wood pipe (15). 19
) is an operating device (target temperature setting means) that issues commands such as setting the target hot water temperature and stopping the drive of the device, (20) is the CP
Consists of a one-chip microcomputer with U and ROM etc. to operate the controller (19) and the temperature sensor (18)
(21) is a driver that has a drive circuit, a motor, etc. and drives the valves (13) and (14) based on the output signal of the controller (20). be. RO of one-chip microcomputer of controller (20)
As shown in FIG. 5, M stores control data (control characteristics) for specifying the opening/closing speed (R) of the valve according to the deviation (Δt) between the actual hot water temperature and the target hot water temperature. . This controller (20) corresponds to differentiating means, deviation calculating means, and correction coefficient setting means.

This hot water mixing device controls the actual hot water temperature by executing a series of processes shown in the flowcharts of FIGS. 2 and 3.

This hot water temperature control is performed according to the flowchart shown in FIG. 2. First, in step CP+), flag (Fl) (
Perform initialization such as initial value setting of F2).

In this step (Pl), a flag (Fl) is set to 1, a flag (F2) is set to O, and a correction coefficient (
To) is set to a constant (C). As will be described later, the flag (Fl) is set to O in a stable hot water supply state where the actual hot water temperature is maintained at the set temperature for a certain period of time.
The flag (F2) is a zero-order step (1) that is set to 1 when the deviation between the actual hot water temperature and the target hot water temperature exceeds a predetermined value (2 ["O]) due to the opening and closing of other valves, etc. In F2), input processing such as reading the actual water temperature (TM) is performed, and in the following step (F3), the time rate of change (dTM/) of the actual water temperature (TM) is performed.
dt). Then, in step (F4), the correction coefficient (To) is calculated according to the flowchart of FIG.
is determined, and in step (F5) the above-mentioned rate of change over time (dT
The corrected hot water temperature (TM') is calculated from the following equation based on M/dt) and the correction coefficient (TD).

TM TM' = TM + TO & - dt After this, in step (F6), the corrected hot water temperature (TM'
) and the target hot water temperature (TO) (ΔT') (ΔT' =
TO-TM') (hereinafter referred to as the corrected deviation) is calculated, and in the next step (F7), the valve opening/closing speed (R) is searched on a map based on the corrected deviation (ΔT'). This map search for the opening/closing speed (R) of the valve is performed by searching the data table shown in FIG. 5 for the opening/closing speed (R) of the valve corresponding to the corrected deviation (ΔT'). Then the next step (F8
) performs output processing such as energization of the valve drive motor and opens the valve (13) at the opening/closing speed (R) found above.

(14).

The determination of the correction coefficient a (To) in step (F4) is carried out according to the flowchart shown in FIG. First, in the stage 2 (Ql), the value of the flag (Fl) is determined,
If the flag (Fl) is 1, step (Ql3
), and if the flag (Fl) is 0, proceed to step (Q2
), in step (Q2), the flag (F2
), and if the flag (F2) is 1, proceed to step (Q+y) described later; if the flag (F2) is O, proceed to step (Q3). In step (Q3), the target hot water temperature is determined. Deviation (ΔT) between (TO) and actual water temperature (TM) (Δ
It is determined whether the absolute value (1ΔTl) of T=To −TM) exceeds 2[℃], and the absolute value (1ΔTl) exceeds 2[℃].
If the absolute value (1ΔTl) exceeds 2 [℃], the process is repeated again. If the absolute value (1ΔTl) exceeds 2[℃]
4) sets the flag (F2) to 1. #! ! <In step (Q5), the fluctuation processing timer (V) is reset to start counting a predetermined time, and in the next step (Q6), it is determined whether the deviation (ΔT) is positive or negative. In this step (Q6), if it is determined that the deviation (ΔT) is positive or zero, the time change rate (dTM/dt) is determined in step (Q7).
Similarly, if it is determined that the deviation (ΔT) is negative, the time change rate (dT) is determined in step (Q8).
M/dt) is determined whether it is positive or negative. Then step (Q8
), if the time rate of change (dTM/dt) is determined to be negative, a predetermined constant (D) is set to the correction coefficient (To) in step (Q9), and the time rate of change (dTM/dt) is
t) Force (if determined to be positive or zero, step (Q
10), the correction coefficient (To) is set to zero. Similarly,
In step (Q?), time rate of change (dTM/dt)
If is positive or zero, the correction coefficient (To) is a constant CD)
is set, and if the time rate of change (dTM/dt) is negative, the correction coefficient (TD) is set to zero.

Therefore, compared to the case where the actual hot water temperature (TM) is changing away from the target hot water temperature (TO) as shown in the region (A) in FIG. 4, the region (F) in FIG. As shown, when the actual hot water temperature (TM) is changing so as to approach the target hot water temperature (TO), the absolute value of the correction deviation (ΔT') becomes small. As a result, as is clear from Fig. 5, when the actual hot water temperature (TM) is changing closer to the target hot water temperature (TO), the opening/closing speed (R) of the valve becomes smaller.
Additionally, if the actual water temperature (TM) is changing away from the target water temperature (To), the opening/closing speed (R) of the valve will increase and the actual water temperature (TM) will reach the target without any jumps. It is possible to quickly converge to the hot water temperature (TO).

Note that from this step (Q8) to step (Q +2
), the absolute value of the deviation (1ΔTl) is 2
It is executed only within the time set in the fluctuation processing timer (V) after exceeding [°C].

On the other hand, in step (Ql3), it is determined whether the absolute value of the deviation (1ΔTl) is less than or equal to 0.5 [''C], in other words, whether the actual hot water temperature (TM) has converged to the target hot water temperature (To). Determine whether or not, and the absolute value (1ΔTl) is 0.5 [”0]
If it exceeds the stability timer (St
) to start counting the predetermined time, and if the absolute value (1ΔTl) is less than 0.5 ["C!], check whether the stability timer (St) has finished counting at step (Q + s). In this step (Q +s ), if it is determined that the stability timer (St) has completed counting, the flag (Fl) is set to O. In other words, the actual water temperature (TM) is When the state in which the target hot water temperature (To) has been reached continues for the time set in the stability timer (St), it is determined that the hot water is in a stable hot water supply state, and 0 is set in the flag (Fl).

In step (Q17), it is determined whether or not the fluctuation processing timer (V) has completed timing, and if the fluctuation processing timer (V) has not completed timing, the processing from step (Q6) is performed. , step (Q +s ) (QCs ) (Q
20) This step (Q
Cs), the flag (Fl) is set to 1, and the step (Q
Cs), the flag (F2) is set to 0, and in step (Q 20 ), the correction coefficient (To ) is set to a constant (C), and in step (Q 21 ), the stability timer (St) is reset. Start timing.

(Effects of the Invention) As described above, according to the hot water mixing device according to the present invention, the target temperature can be quickly approached by operating the temperature correction coefficient during pressure fluctuation. Furthermore, after a certain period of time has elapsed after the pressure fluctuates, the correction coefficient becomes normal, so hunting can be prevented.

[Brief explanation of the drawing]

1 to 5 show a hot water mixing device according to an embodiment of the present invention, in which FIG. 1 is an overall configuration diagram, FIG. 2 and FIG.
The figure is a phroni 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 wood pipe 16・
.....Temperature sensor (detection means) 18 ..... Controller (target temperature setting means) 20
...Controller (differentiating means, correction means, temperature change direction determining means, correction coefficient setting means, correction value calculation means) 21...Driver patent applicant Totoki Co., Ltd. Agent Patent Attorney 2 1) Participant Patent Attorney
Kuni Ohashi, Patent Attorney, Department
Yama Udo Patent Attorney No 1) Shigeru 1st Illustration

Claims (1)

[Claims] A hot water mixing device that mixes hot water and water by adjusting the mixing ratio with a valve, detects the temperature of this mixed water, and controls the temperature by driving a valve based on the detected temperature. a detecting means for detecting the temperature of the water, a differentiating means for calculating a time rate of change in temperature based on an output signal of the detecting means, a target temperature setting means for commanding a set temperature that is a control target, and a a deviation calculating means for calculating a deviation between the temperature detected by the means and the set temperature commanded by the target temperature setting means; and a correction coefficient setting means for setting a correction coefficient according to the sign or negative of the deviation calculated by the deviation calculating means. and adding the sum of the temperature detected by the detection means to the product of the correction coefficient set by the correction coefficient setting means and the time rate of change calculated by the differentiation means to obtain a correction temperature; and , the correction coefficient is set to a predetermined value when the deviation is positive and the time rate of change of the temperature is positive; when the deviation is negative and the time rate of change is negative, the correction coefficient is set to a predetermined value; when the deviation is negative and the time rate of change is positive; A hot water mixing device characterized in that when the deviation is positive and the time rate of change is negative, the temperature is set to zero.