JP3207569B2 - Oxygen supply control device of pressure control room for deep sea diving system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure adjusting chamber for a deep sea diving system, and more particularly to an oxygen supply control device for a pressure adjusting chamber for a deep sea diving system in which an oxygen partial pressure control device in the room is improved.

[0002]

2. Description of the Related Art In a conventional pressure regulating chamber for a diving system,
At a shallow depth (less than 300m), the operation of a fast oxygen partial pressure detector such as an O ₂ sensor is guaranteed, and the oxygen partial pressure in the room is controlled by using the detected value. At depth, there is no suitable detector that is guaranteed to operate fast, and there is no other way to measure the oxygen partial pressure than using an oxygen analyzer as an oxygen detector.

[0003]

As described above, when an oxygen analyzer is used as the oxygen detector of the pressure regulating chamber for a deep-sea diving system, the oxygen partial pressure must be reduced because the sample time of the oxygen analyzer is long. There is a problem in that overshooting is repeated even if control is performed to keep the temperature constant. The present invention seeks to solve such problems, and even when an analyzer is used as a detector for the oxygen partial pressure and the carbon dioxide partial pressure in the pressure regulating chamber for a deep sea diving system, the interior of the chamber is also used. Provided is an oxygen supply control device for a pressure adjustment chamber for a deep sea diving system, wherein the oxygen supply amount to the room can be adjusted by fuzzy control based on a detection signal of the detector in order to appropriately perform oxygen partial pressure. It is an object.

[0004]

In order to achieve the above object, an oxygen supply control device for a pressure regulating chamber for a deep sea diving system according to the present invention comprises: a pressure regulating chamber for a deep sea diving system; An oxygen supply system, an oxygen supply amount adjusting means capable of adjusting the amount of oxygen sent to the pressure adjustment chamber by the supply system, an oxygen detector capable of detecting an internal oxygen partial pressure of the pressure adjustment chamber, and the pressure adjustment. A carbon dioxide detector capable of detecting the partial pressure of carbon dioxide inside the chamber, and a control system that sends a control signal to the oxygen supply amount adjusting means based on each detection signal of the oxygen detector and the carbon dioxide detector, The control system exchanges the membership value based on a change in the detection signal from the oxygen detector, and a first rule unit that exchanges the membership value based on the detection signal from the oxygen detector. 2nd roux Unit, a third rule unit for exchanging a membership value based on a change in the detection signal from the carbon dioxide detector, and an output signal from the first, second, and third rule units. A fuzzy inference unit that evaluates a membership value for a control signal to the oxygen supply amount adjustment unit using an inference table, and an output rule unit that outputs the control signal from the fuzzy inference unit. I have.

[0005]

In the above-described oxygen supply control apparatus for a pressure regulating chamber for a deep sea diving system according to the present invention, a detection signal from an oxygen detector provided in the pressure regulating chamber and a detection signal from a carbon dioxide detector provided in the chamber are provided. By the fuzzy control based on the signal, a control signal is sent to the oxygen supply amount adjusting means to adjust the supply amount of oxygen supplied to the pressure adjustment chamber through the ventilation system, and to keep the oxygen partial pressure in the pressure adjustment chamber constant. The action of securing is performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of an oxygen supply control device for a pressure regulating chamber for a deep sea diving system as an embodiment of the present invention with reference to the drawings. FIG. 1 is a system diagram, FIG. 3 is a flowchart showing the flow of the control, and FIG. 4 is an explanatory diagram of the fuzzy inference. Figure 1
As shown in FIG. 2, the oxygen supply control device of the present embodiment includes a diving system pressure adjustment chamber 1 and a circulation system 2 for the pressure adjustment chamber 1. It has an oxygen supply amount adjusting means 3 which can adjust the supply amount of oxygen sent to the apparatus.

In the pressure adjusting chamber 1, there are provided an oxygen detector 4 capable of detecting the internal oxygen partial pressure and a carbon dioxide detector 5 capable of detecting the internal carbon dioxide partial pressure. Further, a control system 8 for sending a control signal to the oxygen supply amount adjusting means 3 based on each detection signal of the oxygen detector 4 and the carbon dioxide detector 5 is provided. The oxygen supply amount adjusting means 3 includes:
It has a function of adjusting the oxygen supply amount of the oxygen supply system 6 that is supplied in the middle of the circulation system 2 and supplies oxygen to the circulation system 2, and the opening degree of the supply amount is adjusted by air from the service air system 8. It is adjusted by the air operated valve 6. Note that a blower 2a and a silencer 2b are also provided in the middle of the circulation system 2.

Then, as shown in FIG. 2, the control system 7 first performs conversion into a membership value set according to a membership value table as shown in Table 1 based on a detection signal φ from the oxygen detector 4. Table 2 based on the rule unit 11a, a change amount conversion unit 10a that converts a detection signal from the oxygen detector 4 into a change amount, and a change amount signal Δφ from the change amount conversion unit 10a.
And a change amount conversion unit 11b for converting a detection signal from the carbon dioxide detector 5 into a change amount, and a change amount conversion unit 11b for converting the detection signal from the carbon dioxide detector 5 into a change amount. The change amount signal Δ from the converter 11b
A third rule part for converting into a membership value set according to a membership value table as shown in Table 3 based on C
11c. Note that the membership values in Tables 1 to 3 indicate fuzzy characteristics and indicate the degree to which ambiguity is treated quantitatively. In the present embodiment, for ease of calculation,
Discrete value type is used.

[0009]

[Table 1] Oxygen (450 m depth) -4; less than -0.480 -3; 0.480-0.485 -2; 0.485-0.490 -1; 0.490-0.495 0; 0.495-0 0.505-0.510 2; 0.510-0.515 3; 0.515-0.520 4; 0.520 or more

[Table 2] Oxygen change (depth 450m) -3; ~ -less than -0.003 -2; -0.003-0.002 -1; -0.002--0.0010; -0.001-0.001 1; 0.001 to 0.002 2; 0.002 to 0.003 3; 0.003 to

[Table 3] Change in carbon dioxide amount (depth 450 m) -3; -less than -0.00003 -2; -0.00003 to -0.00002 -1; -0.00002 to -0.00001 0; -0.00001 to 0.0. 000011; 0.00001-0.000022; 0.00002-0.000033; 0.00003-

Further, the control system 8 has a membership for a control signal to the air-operated valve 6 in the oxygen supply amount adjusting means 3 based on output signals from the first, second and third rule sections 11a, 11b, 11c. The fuzzy inference unit 12 evaluates the values using inference tables (fuzzy rules) as shown in Tables 4 and 5 and makes a conclusion according to the membership value table as shown in Table 6.
And an output rule unit for converting an output signal from the fuzzy inference unit 12 into a control signal to the oxygen supply amount adjusting means 3 and outputting the control signal.
13 is provided.

By the way, the fuzzy rules in Tables 4 and 5 are based on the know-how of if then, such as Rule 1; if the amount of detected oxygen is very small and the amount of change in oxygen is greatly reduced, then increase the amount of supplied oxygen. Rules are expressed.

[Table 4]

[Table 5]

[Table 6] φ: Oxygen detection amount Δφ; Oxygen change amount ΔC; Carbon dioxide change amount Input side NL; Large and small (relative to target value) NS; Small and small (〃) ZR; 0 (〃) PS; Small and large (〃) PL Large (（) output side NL; large decrease (supply amount) NS; small decrease (〃) ZR; unchanged (〃) PS; small increase (〃) PL; large increase (〃)

In this embodiment, control is performed according to the flowchart shown in FIG. 3 under the above configuration. That is, first, the communication device is initialized in an initialization routine,
A necessary lookup table (trigonometric function ratio) is created. Next, in oxygen amount detection, oxygen partial pressure data is read from the oxygen detector, and in subsequent carbon dioxide amount detection, carbon dioxide partial pressure data is read from the carbon dioxide detector. Fuzzy inference is performed from these data, and a control output to the oxygen supply amount adjusting means 3 is performed.

The fuzzy inference will be described below with reference to a specific example. As an example, a case where the depth is 450 m, the oxygen partial pressure is 0.460 ata, the oxygen amount change is −0.004 ata, and the carbon dioxide amount change is 0.00004 ata will be described. (▽ in Tables 1 to 3) As shown in FIG. 4, a logical AND of the grade of the input value with respect to the condition part membership value S is performed for each rule, and a conclusion S ₁ ′ to S ₄ ′ is generated for each rule. (a) to (d) and the logical sum of the conclusions S ₁ ′ to S ₄ ′ for each rule, perform the work of tabulating the entire conclusion, and combine the entire conclusion in the above inference processing into one The center-of-gravity calculation (e) is performed to obtain the final value. In addition,
In this embodiment, the position of the center of gravity is 2.77, but as is clear from the conditions, this condition is the maximum oxygen supply amount. The supply amount is the maximum supply limit (2.77 / 4) × 100 (%) = 69%. As described above, in the present embodiment, the control of the oxygen partial pressure in the pressure adjusting chamber 1 for deep sea is performed by fuzzy control based on the detection signals of the oxygen detector 4 and the carbon dioxide detector 5 having a long sampling cycle. Can be done properly.

[0014]

As described above in detail, according to the oxygen supply control device for the pressure control chamber for the deep sea diving system of the present invention, the oxygen supply to the pressure control chamber for maintaining the oxygen partial pressure in the pressure control chamber constant. By performing the control by fuzzy control based on the detection signals from the oxygen detector and carbon dioxide detector in the same room, overshoot occurs even when using a deep-depth oxygen detector (carbon dioxide detector) with a slow sampling cycle. The effect that the reduced oxygen supply control can be performed is obtained.

[Brief description of the drawings]

FIG. 1 is a system diagram of an oxygen supply control device of a pressure adjustment chamber for a deep sea diving system as one embodiment of the present invention.

FIG. 2 is a block diagram of a control system of FIG.

FIG. 3 is a flowchart showing a flow of control in FIG. 1;

FIG. 4 is an explanatory diagram of fuzzy inference.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressure control room for diving systems 2 Circulation system 2a Blower 2b Silencer 3 Oxygen supply amount adjustment means 4 Oxygen detector 5 Carbon dioxide detector 6 Oxygen supply system 7 Air operated valve 8 Control system 9 Service air system 10a, 10b Change amount Conversion unit 11a First rule unit 11b Second rule unit 11c Third rule unit 12 Fuzzy inference unit 13 Output rule unit

Claims (1)

(57) [Claims] 1. A pressure regulating chamber for a deep sea diving system, an oxygen supply system for the pressure regulating chamber, and an oxygen supply amount regulating means capable of regulating the amount of oxygen sent to the pressure regulating chamber by the supply system. An oxygen detector that can detect the internal oxygen partial pressure of the pressure adjustment chamber, a carbon dioxide detector that can detect the internal carbon dioxide partial pressure of the pressure adjustment chamber, and each of the oxygen detector and the carbon dioxide detector A first rule unit for transmitting a control signal to the oxygen supply amount adjusting means based on the detection signal, wherein the control system exchanges a membership value based on the detection signal from the oxygen detector; and A second rule unit for exchanging a membership value based on a change in a detection signal from the oxygen detector, and a third rule exchanging a membership value based on a change in a detection signal from the carbon dioxide detector. Rule section A fuzzy inference unit for evaluating a membership value for a control signal to the oxygen supply amount adjusting means based on an output signal from the first, second, and third rule units using an inference table; An oxygen supply control device for a pressure adjustment chamber for a deep sea diving system, comprising: an output rule unit that outputs the control signal from an inference unit.