JPS62263513A - In-tank pressure program control device - Google Patents

Abstract

PURPOSE:To execute the highly accurate following by integrating the valve opening time of a pulse width operating output for a specifying time, and correcting the valve opening degree of the first control valve or the second control valve in accordance with the polarity of a deviation for respective specified times. CONSTITUTION:A control device 9, further, counts an opening operating output V' of a control valve based upon the valve opening time (on time of off time) of a pulse width operating output D. Namely, the valve opening time (pulse width) of the operating output D is integrated periodically for a specified time (for example, three minutes), in the specified time, a human body operates the difference in the setting time (for example, 120sec) which is a preferable valve opening time, the rate of the difference to the specified time is made into the valve opening correcting value of the control valve, a new valve opening operating output is counted and transmitted as an operating output V' of a voltage. Namely, the arithmetic operation of (valve opening integrating time - setting time)/specified time + old valve opening) = new valve opening is executed. The operating output V' of the voltage is selectively supplied to the first or second control valves 5 and 6.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to improvement of controllability in a control device that changes the pressure in a tank programmatically.

<Conventional technology> FIG. 3 is a block diagram showing an example of the prior art.

1 is a tank of a diving simulator or the like, and the internal pressure P is increased or decreased in a program ff, IItit. 2 is a pipe line that supplies pressurized gas △ from tank 3 to tank 1;
Reference numeral 4 designates a pipe line for discharging the gas in the tank, and reference numeral 5 designates a first control valve inserted into the pipe line 2, and a second control valve inserted into the pipe line 4.

7.8 is the pressure sensor inside the tank, 7 is for large range (
For example, O~50K<]/cm2), 8 is a small month]
One row requires O/10KQ/Cm'). PV+, P
2 is the three measurements of these sensors 7 and 8 ("■", and is selectively used depending on the control.

Reference numeral 10 denotes a pressure setting device, which supplies a pressure setting value S② that changes programmatically to the control device 9.

The control device 9 executes control calculations such as proportionality and M minutes for the deviation between one of the measurement 1-direction Pv selected from measurement 1-direction PV+ and PV2 and the set value S■, and controls the valve opening 1 sentence of the voltage signal. Sends the operation output V.

Reference numeral 11 denotes a voltage/current converter, which converts a voltage operation output V to a current operation output I. 12 is a changeover switch.
J'' stage, and the current operation output I is selectively supplied to the control valve 5 or 6 by the switching control signal C generated by the control device 9 depending on the polarity of the deviation. Therefore, SV>P
When V, the manipulated output I is supplied to the control valve 5, and when SV<PV, the manipulated output r is supplied to the control valve 6.

Check valves 13 and 14 are inserted into the pipes 2 and 4, and are controlled to be closed by a signal from the control I system when the control valves are not to be operated.

<Problem 2 to be solved by the invention> In such a configuration, if the pressure set value SV changes upward in a programmatic manner over time as shown in FIG.
The measured value PV follows this, but the operation output is not generated unless a deviation occurs, and there is a delay in the pressure response in the tank to the supply or discharge of pressurized gas, so the control result cannot be measured in one straight line. As shown by the dotted line, the corrective action is overdone, and the f and II control to accurately follow the set value is difficult, and the accuracy is L. Set value ±2% of full 5c
I can only hope for ale.

Another example of the prior art is that the first and second control valves 5 and 6 shown in FIG. A configuration is conceivable in which a second on/off valve is provided and the control device 9 transmits an operational output in the form of a pulse width signal to selectively control opening and closing of the on/off valve.

When using an on-off valve configuration, even when the pressure inside the tank is high, it is necessary to ensure a pressure difference on both sides of the valve and to enable pressurization operation that follows the setting gradient. The diameter of the pipe is larger than that which allows the supply of gas. However, if the pipe diameter is designed to be large, in the case of pressurization control, when the tank internal pressure is low, the gradient of the tank internal pressure change that occurs at the moment the on-off valve opens becomes large, making it difficult for people to work inside the tank. There is a risk of exceeding the upper limit for instantaneous pressure changes. Also, in the case of pressure reduction control, when the tank internal pressure is high, such I? -1 problem will occur.

Roughly speaking, when using an on-off valve, as the pressure inside the tank changes, the pressure to the pressurized gas is constant, so the gradient of pressure change when the on-off valve opens also changes. , it is difficult to ensure strict follow-up accuracy for one cycle of one-cogram setting.

The present invention solves these problems of the conventional 'vA position, and has strict tracking precision 1. The purpose of the present invention is to provide a control device capable of controlling t (for example, ±0.2% of a set value).

Means for Solving the Problems> The structural feature of the present invention is that the first on/four valve and the first control are inserted in series in the middle of a pipe line for supplying pressurized gas into a tank. A valve, a second on-off valve and a second = first control valve inserted in series in the middle of the pipe that discharges the gas in the tank, and the measured value of the pressure sensor in the tank and the program. The deviation from the pressure set value that is changed to is calculated and the pulse width manipulated output is supplied to the first on/off valve or the second on/off valve according to the polarity of the deviation, and the pulse width manipulated output is Accumulate the valve opening time for a specified period of time, and then calculate the valve opening degree of the first control valve or -F2 second control valve according to the polarity of the deviation for each specified time (general fixed time of cumulative valve opening time). 1! A control device for supplying the first control valve or the second control valve with an operation output corrected according to the expression p of /regular time + old speech rate = new speech rate. T! It is at the final point.

Effect> According to the present invention, the supply pipe and exhaust of the Jr. pressure gas↑1
The on-off valve and the control valve are inserted in series, and the on-off valve is controlled to open and close by controlling the deviation and controlling the pulse width by controlling the output of the pulse width. A device that calculates the rate of change within the current time of the difference between the open field and the set time that is preferable for the human body in the valve opening time, and adds this to the old valve opening IQ of the control valve to determine the opening valve opening time. By executing '?:SwJIyoshi' it became possible to follow.

<Example> An example of the present invention will be explained with reference to FIG. Components that are the same as those explained in FIG. 3 are given the same reference numerals, and the explanation thereof will be omitted. 15 is a 171st on-off valve inserted in series with the first control valve 5 of the 1+11 pressure gas supply pipe 2; 16 is inserted in series with the second control valve t6 of the tank gas discharge pipe 4; This is the second on/off valve.

The control device 9 performs a control calculation on the deviation between the selected pressure measurement ktl PV and the pressure set value Sv and issues a pulse width operation output. This operation output is transmitted to the first on/off valve 15 or the second on/off valve 15 via a changeover switch means 17 driven by a changeover control signal C transmitted according to the deviation.
Supplied to the solenoid of off valve 1G.

The device further includes a valve Ij with a pulse width control output.
The opening control output V' of the control valve is calculated based on the f1 time (on time or f, U':A) time).

In other words, the valve opening time (pulse width) of the operation output is changed periodically)
↓ Integrate 2 fixed times (for example, 3 minutes), calculate the difference between J5 within this current time and 5q fixed time (for example, 120 seconds), which is the preferred valve opening time for the human body, and divide the difference against the specified time. The valve opening soot of the alloy control valve is set as a positive value, a new valve opening manipulation output is calculated by 81, and the result is transmitted as a voltage manipulation output v'. That is, the following calculation is executed: (valve opening cumulative time general fixed time)/current valve opening time (old valve opening degree) - new valve opening degree.

As in the case of the conventional device shown in FIG.
is converted into the first one through the changeover switch means 12:
It is selectively supplied to the control valve or the second control valve 6.

When such operation of the valve opening degree of the control valve is executed optimally, the cumulative valve opening time and the set time are the same (1a), and the valve opening time of the on/off valve is controlled to an optimal value.

FIG. 2 is an explanatory diagram of the operation of the s1+ on device 9. After switching between large range and small range control is performed on the measured value, a control O1I calculation is performed on the deviation, and the calculation result is applied to the pulse width. You can change the operation and send the operation output. The pulse width of this operation output is the current time stacking point,
A valve l7i degree correction calculation is executed to provide a roughly optimum valve opening 112, and a valve opening degree manipulation output V' of the control valve is transmitted.

Pressure setting (At the start of the direct Sv program, the opening degrees of control valves 5 and 6 are set so as to generate a pressure gradient that is slightly larger than the gradient of the program setting; Program control is started, and the control valve is maintained at 11 degrees so that the opening time of the on/off valve is at the optimum time j1;1.

ζEffects of the Invention> As explained above, according to the present invention, due to the pressure control feature 11 by the combination of the on-off valve and the control valve, the sudden correction operation when the on-off valve opens is reduced by V.
This makes it possible to prevent the corrective action from taking too long due to one control operation, as would be the case with only a control valve.As a result, with normal control using only a control valve, the tracking accuracy is 2% off full
Approximately 5 cale is ill field 'T' Atta tfi, setting 1i (!+0.2% of reading 'Q' control result within 1F can be T.

4. Drawing] 1! gC1'1sx1light FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the control device, FIG. 3 is a block diagram showing an example of the prior art, and FIG. 4 is its operation. It is an explanatory diagram.

1... Tank 2... Pressurized gas supply pipe line 4
...Discharge pipe 5, 6...1st. Second control valve 7.8...Pressure Hincer 9...Control tIl
Device 10...Pressure step regulator 15.16...1st. 2nd ON Δ Fig. 1 Fig. 2

Claims (1)

[Scope of Claims] A first on-off valve and a first control valve inserted in series in the middle of a pipe line that supplies pressurized gas into a tank;
a second on-off valve and a second control valve inserted in series in the middle of a pipe line for discharging gas in the tank;
The deviation between the measured value of the tank pressure sensor and the pressure set value that is changed programmatically is calculated, and the pulse width operation output is set to the first on/off valve or the second on/off valve depending on the polarity of the deviation. At the same time as supplying the pulse width operation output to the valve, the valve opening time of the pulse width operation output is accumulated for a specified time, and the valve opening degree of the first control valve or the second control valve is adjusted at each specified time according to the polarity of the deviation. The controller includes a control device that supplies the first control valve or the second control valve with a modified operating output according to the formula: (accumulated valve opening time - set time) / specified time + old valve opening = new valve opening. Tank pressure program control device.