JPH08286760A - Water supply control method - Google Patents

Abstract

PURPOSE: To prevent stepping of the force of water by delaying the operation or a specific solenoid valve by a delay time to make the opening timings and the closing timings of respective solenoid valves coincide with each other in the case of simultaneously opening and closing plural solenoid valves provided in parallel. CONSTITUTION: Solenoid valves A to D of 1, 2, 4, and 8L/min flow rates are provided in parallel, and opening and closing of solenoid valves A to D are controlled by a control part 1. When a signal to change the flow rate is inputted to the control part 1, a delay time ΔT of the solenoid valve of a maximum flow rate out of solenoid valves to be opened is calculated, and a valve open signal is first outputted to solenoid valves to be opened. After T seconds, the valve open signal is outputted to solenoid valves to be opened. When ΔT is larger than 0, the open signal is outputted whenΔT smaller than 0, the close signal is outputted when ΔT elapses after the output of the open signal. Thus, stepping is surely prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the amount of water supplied from a water supply device in which a plurality of electromagnetic valves having different flow rates are installed in parallel. More specifically, the present invention relates to a water supply control method in which the opening / closing timing of an electromagnetic valve is controlled so that the flow rate changes without a step when the flow rate is changed.

[0002]

2. Description of the Related Art By combining a plurality of solenoid valves having different water flow rates, it is possible to control a large number of water pressures by opening and closing the solenoid valves. For example, as shown in FIG. 1B, a solenoid valve A having a flow rate of 1 L / min and a flow rate of 2 L / m.
in solenoid valve B and solenoid valve C with a flow rate of 4 L / min,
According to the water supply device in which the electromagnetic valve D having a flow rate of 8 L / min is installed in parallel, it is possible to control the water force in 16 ways including the water stop state.

[0003]

Generally, in a solenoid valve, a time delay occurs after the opening / closing control signal is given and before the opening / closing operation is actually performed. This delay is particularly noticeable during the closing operation. This time delay varies depending on the water flow rate and water supply pressure even with the same type of solenoid valve. Generally, the higher the water supply pressure and the larger the water flow rate, the longer the delay in this time.

When the water pressure control is performed by the combination of the solenoid valves as described above, the water pressure is changed as shown in "actual discharge water pressure" in FIG. There is a step.

That is, when a valve opening signal is output to one solenoid valve and a valve closing signal is simultaneously output to the other solenoid valve, the one solenoid valve opens relatively quickly, The other solenoid valve closes later than that. Therefore, a valve opening signal is sent to one of the two solenoid valves installed in parallel,
When the closing signals of the other solenoid valve are output simultaneously,
From the opening of the one solenoid valve to the closing of the other solenoid valve, both solenoid valves are in the open state, and the flow rate during that time becomes excessive, and the flow rate has a step. Will end up.

In FIG. 8, only the solenoid valve C is first opened to discharge water at 4 L / min, and then the solenoid valve C is discharged.
And solenoid valves B and D are opened and 10
Water is discharged at L / min (2 + 8 = 10 L / min).
After that, the solenoid valves B and D are closed and the solenoid valves A and C are
Is opened to discharge water at 5 L / min (1 + 4 = 5 L / min), and finally the solenoid valves A and C are closed and only the solenoid valve B is opened to discharge water at 2 L / min.
In the figure, T _A-op , T _B-op , T _C-op , and T _D-op are the respective solenoid valves A to D after the solenoid valves A, B, C, and D are each given an opening signal. Is the time required to start opening. Further, T _A-cl , T _B-cl , T _C-cl , and T _D-cl are solenoid valves A to
This is the time required from when the valve closing signal is given to D until the solenoid valves A to D actually start to close.

As shown in the figure, 4 L / min → 10 L / m
When changing in, 10 L / min → 5 L / min and 5 L / min → 2 L / min, stepping occurs (indicated by an arrow in the “actual water discharge force”).

It is an object of the present invention to provide a water supply control method which prevents such stepping in a water supply device in which electromagnetic valves are arranged in parallel.

[0009]

A water supply control method according to claim 1 is a method for controlling the amount of water supplied from a water supply device in which a plurality of electromagnetic valves having different flow rates are installed in parallel. In the method of controlling the amount of water supply by changing the number or combination of, when one solenoid valve is closed and the other solenoid valve is opened, after outputting a closing signal to the electromagnetic valve to be closed, The delay time is set according to the operation delay time of the electromagnetic valve to be closed, and the valve opening signal to the electromagnetic valve to be opened is delayed by this delay time and output.

According to a second aspect of the water supply control method of the first aspect, when the plurality of solenoid valves are closed, the delay time is set according to the operation delay time of the solenoid valve having the largest flow rate among them. It is characterized by doing.

A third aspect of the water supply control method according to the first or second aspect is that a water pressure control device is provided upstream of the water supply device to equalize the water supply pressure flowing into the water supply device. Is.

According to a fourth aspect of the water supply control method of the present invention, in the first or second aspect, a water supply pressure detecting means is provided upstream of the water supply device, and the delay time is corrected by the water supply pressure detected by the means. It is characterized by.

A water supply control method according to a fifth aspect of the present invention is the water supply control method according to any one of the first to fourth aspects, further comprising flow rate detecting means for detecting the total amount of water passing through the water supply device, and correcting the delay time by the detected value of the flow rate detecting means. It is characterized by that.

The water supply control method according to claim 6 is a method for controlling the amount of water supplied from a water supply device in which a plurality of electromagnetic valves having different flow rates are installed in parallel, and the number or combination of electromagnetic valves to be passed is changed. a method for controlling the water supply amount by the value obtained by subtracting the operation delay time T _op of the solenoid valve which is opened from the operation delay time T _cl of the solenoid valve to be closed [Delta] T ([Delta] T =
T _cl −T _op ) is calculated, and when ΔT is positive, a valve closing signal is first output, then when ΔT has elapsed, a valve opening signal is output, and when ΔT is negative, a valve opening signal is first output. It is characterized in that a valve closing signal is outputted after ΔT has elapsed.

According to a seventh aspect of the present invention, in the water supply control method according to the sixth aspect, when closing a plurality of solenoid valves, the operation delay time of the solenoid valve having the maximum flow rate among them is set to T _cl , and a plurality of solenoid valves are set. When the solenoid valve is opened, the operation delay time of the solenoid valve having the maximum flow rate among them is set to T _op .

[0016]

According to the present invention, when a plurality of solenoid valves installed in parallel are simultaneously opened and closed, the operation of a specific solenoid valve is delayed by a delay time so that the opening timing and closing timing of each solenoid valve can be adjusted. Can be matched to prevent the water pressure from being stepped.

(Claim 1) According to claim 1, the delay time is determined by focusing on the closing operation of a certain solenoid valve, and when this solenoid valve is closed and the other solenoid valves are opened, the operation of the solenoid valve to be closed. The open signal sent to the solenoid valve that opens according to the delay time is delayed with respect to the close signal.

(Claim 2) However, if the number of combinations of solenoid valves increases, the amount of data increases and the control becomes complicated in such a method. Therefore, in the second aspect, among the solenoid valves that perform the operation from opening to closing when switching the combination of the solenoid valves, the solenoid valve having the largest water passage amount is discriminated and the optimum delay time is given to the solenoid valve. When a step is actually generated, the delay of the solenoid valve with a large water flow has a great influence. With a solenoid valve with a small water flow rate, even if there is a step, the effect is small because it is a small amount in terms of the total water flow rate.

(Claim 3) The delay time of the solenoid valve is
Since it also changes depending on the water supply pressure, when performing such control, it is desirable to provide a means such as a pressure regulating valve for keeping the water supply pressure constant on the water supply side as in claim 3.

(Claim 4) In the case where the water supply pressure changes, a means (for example, a pressure sensor) for detecting the water supply pressure is provided and a delay time corresponding to the water supply pressure is provided as in the fourth aspect. Or by giving the delay time as a function of the water supply pressure, it becomes possible to smoothly control the water pressure at various water supply pressures.

(Claim 5) The water pressure in each combination of solenoid valves increases with the water supply pressure. Therefore,
According to the fifth aspect, means (for example, a flow rate sensor) for detecting the total water flow amount is provided, and the delay time is corrected according to the actual water force in each combination. Alternatively,
A certain combination is decided, and the delay time is corrected according to the water force when the combination is obtained.

(Claim 6) According to claim 6, stepping is similarly prevented even in a solenoid valve which is closed earlier than the valve is opened.

(Claim 7) In claim 7, when a large number of solenoid valves are arranged in parallel, the delay time is determined corresponding to the solenoid valve with the largest flow rate.

[0024]

Embodiment FIG. 1 shows an embodiment of claim 2.
Solenoid valve A with flow rate of 1, 2, 4, 8 L / min
D is arranged in parallel, and the control section controls opening / closing of each of the solenoid valves A to D.

When a signal for changing the flow rate is input to the control unit 1, the delay time ΔT of the solenoid valve having the maximum flow rate among the solenoid valves to be closed is calculated, and the solenoid valve to be closed is first closed. Is output. After ΔT seconds, a valve opening signal is output to the solenoid valve to be opened.

In FIG. 2, the flow rate is changed from 0 L / min to 1 L / mi.
n → 2L / min → 3L / min → 2L / min → 1L
It is a timing chart when changed to / min,
When changing to close solenoid valve A and open solenoid valve B, solenoid valve B
Stepping does not occur at any of the changes of closing the solenoid valve A and opening the solenoid valve A.

FIG. 3, FIG. 4, and FIG. 5 are claims 3 and 4, respectively.
4 and 5 show examples. In FIG. 3, a pressure regulating valve 2 is provided on the upstream side of the water supply device to level the inflow pressure into the water supply device.

In FIG. 4, the pressure of the water flowing into the water supply device is detected, and the delay time is corrected in the controller 1 based on the detected pressure.

In FIG. 5, the flow rate of the entire water supply apparatus is detected by the flow rate sensor 4, and the delay time is corrected by the control unit 1 based on this flow rate.

FIGS. 6 and 7 are a flow chart and a timing chart showing the embodiments of claims 6 and 7, wherein the time from when an open signal is given to the solenoid valve until when the fluid actually starts to flow is T _op. , T _cl is the time from when a closing signal is given to the solenoid valve to when the flow rate actually starts to decrease.

As shown in FIG. 6, when the delay time ΔT is set at the time of switching the water pressure associated with the opening and closing operations of the solenoid valve, the longest T _cl among the solenoid valves performing the closing operation when switching the combination of solenoid valves. _Is calculated as T _{cl (max)} , and the shortest T _op among the solenoid valves performing the opening operation is calculated as T _{op (min)} .

The delay time ΔT (ΔT ₁ , ΔT _{2 in} FIG. 7) given by the opening / closing operation of the solenoid valve is expressed by the following equation.

ΔT = T _{cl (max)} −T _{op (min) When} ΔT is larger than 0, ΔT is output after the closed signal is output.
After T has elapsed, an open signal is output.

When ΔT is smaller than 0, an open signal is output and then a close signal is output after ΔT.

As a result, as shown in the actual water discharge force in FIG. 7, stepping is surely prevented. In addition, in FIG. 7, 0 → 4 → 1
The flow rate is changed as 0 → 5 → 2 → 0 (L / min). The open solenoid valve is C → (B + D) → (A +
The order is changed from C) to B.

[0036]

As described above, according to the water supply control method of the present invention, in the water supply control method in which a plurality of solenoid valves are installed in parallel,
The step of the flow rate when changing the flow rate involving both opening and closing of the solenoid valve is eliminated.

[Brief description of drawings]

FIG. 1 is a flow chart and a piping system diagram showing an embodiment of claim 2.

FIG. 2 is a timing chart showing an embodiment of claim 2;

FIG. 3 is a piping system diagram showing an embodiment of claim 3;

FIG. 4 is a piping system diagram showing an embodiment of claim 4;

FIG. 5 is a piping system diagram showing an embodiment of claim 5;

FIG. 6 is a flowchart showing an embodiment of claims 6 and 7.

FIG. 7 is a timing chart showing an embodiment of claims 6 and 7.

FIG. 8 is a timing chart showing a conventional example.

[Explanation of symbols]

 A, B, C, D Solenoid valve 1 Control unit 2 Pressure regulating valve 3 Pressure sensor 4 Flow rate sensor

Claims (7)

[Claims] 1. A method for controlling the amount of water supplied from a water supply device in which a plurality of electromagnetic valves having different flow rates are installed in parallel, and the amount of water is controlled by changing the number or combination of electromagnetic valves to be passed. In the method described above, when one solenoid valve is closed and another solenoid valve is opened, a closing signal is output to the solenoid valve to be closed, and then the operation delay time of the solenoid valve to be closed is changed. The delay time is set by the delay time, and the valve opening signal to the opened solenoid valve is delayed by this delay time and output. 2. The water supply system according to claim 1, wherein when a plurality of solenoid valves are closed, the delay time is set according to an operation delay time of the solenoid valve having the largest flow rate among them. Control method. 3. The water supply control method according to claim 1, wherein a pressure adjusting device is provided on the upstream side of the water supply device to level the water supply pressure flowing into the water supply device. 4. The water supply control method according to claim 1, further comprising a water supply pressure detecting means provided upstream of the water supply device, and correcting the delay time based on the water supply pressure detected by the means. . 5. The water supply control according to any one of claims 1 to 4, further comprising a flow rate detecting means for detecting a water flow rate of the entire water supply apparatus, and correcting the delay time based on a detection value of the flow rate detecting means. Method. 6. A method for controlling the amount of water supplied from a water supply device in which a plurality of electromagnetic valves having different flow rates are installed in parallel, and the amount of water supply is controlled by changing the number or combination of electromagnetic valves to be passed. In the above method, the value ΔT (ΔT = T _cl −T) obtained by subtracting the operation delay time T _op of the solenoid valve to be opened from the operation delay time T _cl of the solenoid valve to be closed.
_op ) is calculated, a valve closing signal is first output when ΔT is positive, and then a valve opening signal is output when ΔT has elapsed. When ΔT is negative, a valve opening signal is first output, and then ,
A water supply control method, wherein a valve closing signal is output when ΔT has elapsed. 7. The method according to claim 6, wherein when closing the plurality of solenoid valves, the operation delay time of the solenoid valve having the largest flow rate among them is set to T _cl, and when opening the plurality of solenoid valves. A water supply control method, wherein the operation delay time of the solenoid valve having the largest flow rate among them is T _op .