JP2008254676A - Information processor for diver, control method and control program of information processor for diver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide safety information for further safely performing diving by calculating a storage inert gas quantity in conformity with actual momentum of a diver. <P>SOLUTION: In a dive computer, a control part 50 calculates an intercorporated storage inert gas quantity, by effectively shortening a pressure-unreduced diving available time in response to stability, by determining the stability of a water depth change in safety stopping, based on a difference between the actual water depth of the diver in the safety stopping and the predetermined safety stopping water depth. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an information processing apparatus for divers, a control method for an information processing apparatus for divers, and a control program.

Information equipment with water depth measurement and timekeeping functions is used during diving, but recently, based on those measurements, changes in water pressure during diving and changes in atmospheric pressure during high-altitude movements are performed, and inert gas ( An information processing device for divers called so-called dive computers, which simulates the absorption / discharge amount of (nitrogen) by calculation and displays information for diving so as to avoid decompression sickness and perform diving safely, is widely used in divers.
Information processing apparatus for divers equipped with a conventional pressure sensor is a diving mode that is an operation mode during diving. Information necessary for ensuring the safety of a diver with a certain algorithm, such as the current water depth value, The time until the inert gas (such as N2) accumulated excessively in the body is discharged and the safe ascent rate are calculated, and the obtained calculation result is displayed on a display unit such as a liquid crystal display panel (for example, , See Patent Document 1).

If you dive long at a deep water depth and excessive nitrogen has dissolved in your body, you may need to stop decompression to prevent decompression sickness. Decompression sickness mainly occurs when inert gas accumulated in the body tissue or blood grows as bubbles. As divers dive, the surrounding pressure increases and the divers breathe higher pressure air. Breathing pressurized air increases the amount of gas that dissolves into tissues and blood.
On the other hand, the pressure decreases as it rises, and the gas dissolved in the body becomes larger than the gas pressure around the body. As a result, it becomes supersaturated and the risk of decompression sickness is increased by the generation of bubbles. For diving, it is recommended to make a safety stop that stays at the same depth for several minutes in shallow water. The purpose of this is to divert and gradually adjust the body's nitrogen under a certain pressure before it emerges from the sea surface, even if it ascends while maintaining a safe ascent rate. (See Patent Document 2).

Furthermore, in recent years, algorithms have been devised that stop not only at shallow water depths, but also stop at a constant water depth even at deep water depths depending on the degree of penetration of nitrogen in the body. This is expressed as a deep stop or the like (see Non-Patent Literature 1 to Non-Patent Literature 3).
Although it depends on the algorithm model, as a general outline, it stops for 1 minute at a water depth of about half the maximum water depth for diving, and promotes gas discharge in an environment with a high pressure difference. Multiple stops may be derived, such as about half the maximum water depth and half the water depth. In order to perform these stopping actions, it is necessary to maintain neutral buoyancy so that the body does not rise and fall. If you are able to stay at the specified water depth without consuming unnecessary effort, you can lead to safe diving.

Japanese Patent Laid-Open No. 11-23747 Japanese Patent Laid-Open No. 11-23746 http: // www. mares. co. jp / rgbm / deppstop / index. html http: // www. suunto. com / media / suunto / pdf / SuuntDeepStopRGBMLLeaflet — 2061f. pdf http: // www. dmscuba. com / Deep_Stops-BW. pdf

By the way, in the conventional information processing apparatus for divers, the partial pressure of nitrogen in the body is calculated based on the water depth value, so it is not possible to calculate the partial pressure of nitrogen in the body by grasping the diver's motion state and thus the respiratory state. It was.
Especially for divers who cannot adjust neutral buoyancy well, trying to maintain a constant water depth value increases momentum, increases respiration, and the amount of inert gas accumulated in the body also depends on the amount of inert gas obtained from the water depth value. It was supposed to be far away.
Therefore, an object of the present invention is to calculate the amount of accumulated inert gas in accordance with the actual momentum of the diver, and to provide information on the divers that can provide safety information that allows safer diving, An object is to provide a control method and control program for an information processing apparatus for divers.

In order to solve the above-mentioned problem, the information processing device for divers obtains the stability of the water depth change at the time of safe stop based on the difference between the actual water depth of the diver at the time of safe stop and the predetermined safe stop water depth. A stability calculation unit, and an inert gas amount calculation unit that calculates the amount of inert gas accumulated in the body by effectively shortening the no-decompression diving possible time according to the stability, Yes.
According to the said structure, a stability calculation part calculates | requires the stability of the water depth change at the time of a safe stop based also on the difference of the actual water depth of the diver at the time of a safe stop, and the predetermined safe stop water depth.
Thereby, the inert gas amount calculation unit calculates the amount of inert gas accumulated in the body by effectively shortening the non-decompression diving possible time according to the stability.
Therefore, when the stability is low, that is, when it is considered that the actual momentum of the diver is large, the amount of inert gas accumulated in the body is calculated by effectively shortening the no-decompression diving possible time. Therefore, the amount of inert gas accumulated in the body can be calculated more safely.

In this case, in order to effectively reduce the non-decompression diving possible time, the calculation water depth used for calculating the amount of inert gas accumulated in the body is set higher than the actual water depth according to the stability. A calculation depth setting unit may be provided, and the inert gas amount calculation unit may calculate the in-body accumulated inert gas amount based on the calculation water depth.
According to the above configuration, since the calculation water depth used for calculating the in-vivo accumulated inert gas amount is set higher than the actual water depth, the calculated in-body accumulated inert gas amount is more on the safe side. Will have a value.

The calculation depth setting unit may set the calculation water depth by adding a correction water depth determined based on the stability to the actual water depth.
According to the above configuration, since the calculation water depth used for calculating the in-vivo accumulated inert gas amount is set higher than the actual water depth, the calculated in-body accumulated inert gas amount is more on the safe side. Will have a value.
In addition, the stability calculation unit may calculate the stability based on an average value of a difference between the actual water depth per unit time and the safe stop water depth.
According to the above configuration, the calculated in-body accumulated inert gas amount has a safer value without being affected by short-term fluctuations.

In addition, it is determined whether or not inert gas remains in the body when the water surface is paused, and the depth setting unit for calculation calculates the current correction during the next dive if the inert gas body remains when the water surface is paused. The calculation water depth may be set using the water depth.
According to the above configuration, the calculated in-vivo accumulated inert gas amount has a safer value even during the next dive after a water surface pause.
In addition, in order to effectively reduce the non-decompression diving possible time, a predetermined permissible supersaturated nitrogen amount for calculation is set by reducing a predetermined permissible supersaturated nitrogen amount of each tissue according to the stability and setting the permissible supersaturated nitrogen amount for calculation. And the inert gas amount calculation unit calculates the amount of inert gas accumulated in the body based on the calculation allowable persaturated nitrogen amount.
According to the above configuration, the calculated allowable supersaturated nitrogen amount used for calculation of the in-vivo accumulated inert gas amount is set to a side smaller than the actual allowable over-saturated nitrogen amount. Will have a safer value.

The calculation allowable supersaturated nitrogen amount setting unit may set the calculation allowable persaturated nitrogen amount by multiplying the predetermined allowable supersaturated nitrogen amount by a correction coefficient determined based on the stability. Good.
According to the above configuration, the calculated allowable supersaturated nitrogen amount used for calculating the in-vivo accumulated inert gas amount is set to be smaller than the predetermined permissible supersaturated nitrogen amount of each actual tissue. The gas amount has a safer value.
In addition, the stability calculation unit may calculate the stability based on an average value of a difference between the actual water depth per unit time and the safe stop water depth.
According to the above configuration, the calculated in-body accumulated inert gas amount has a safer value without being affected by short-term fluctuations.

Also, it is determined whether or not the body inert gas remains at the time of resting on the water surface, and the allowable oversaturated nitrogen amount setting unit for calculation determines whether or not the body inert gas remains at the time of water surface resting during the next dive. The calculation allowable persaturated nitrogen amount may be set using the current correction coefficient.
According to the above configuration, the calculated in-vivo accumulated inert gas amount has a safer value even during the next dive after a water surface pause.
Moreover, you may make it provide the notification part which notifies the said stability to the said diver.
According to the said structure, the diver can grasp | ascertain the stability of an own stop state easily.

In addition, the control method of the information processing device for divers is a stability that calculates the stability of the water depth change at the time of safe stop based on the difference between the actual water depth of the diver at the time of safe stop and the predetermined safe stop water depth. It is characterized by comprising a calculation process and an inert gas amount calculation process for calculating the in-vivo accumulated inert gas amount by effectively shortening the no-decompression diving possible time according to the stability.
According to the above configuration, when the stability is low, that is, when it is considered that the actual momentum of the diver is large, the amount of inert gas accumulated in the body is calculated by effectively shortening the no-decompression diving possible time. Therefore, the amount of inert gas accumulated in the body can be calculated more safely.

In addition, in the control program for controlling the information processing apparatus for divers by a computer, the change in the water depth at the time of safe stop is based on the difference between the actual water depth of the diver at the time of safe stop and the predetermined safe stop water depth. It is characterized in that the stability is obtained and the amount of inert gas accumulated in the body is calculated by effectively shortening the no-decompression diving possible time according to the stability.
According to the above configuration, when the stability is low, that is, when it is considered that the actual momentum of the diver is large, the amount of inert gas accumulated in the body is calculated by effectively shortening the no-decompression diving possible time. Therefore, the amount of inert gas accumulated in the body can be calculated more safely.

According to the present invention, it is possible to calculate the amount of accumulated inert gas in accordance with the actual momentum of a diver, and to provide highly reliable safety information that enables diving more safely.

Next, preferred embodiments of the present invention will be described with reference to the drawings.
[1] Overall Configuration FIG. 1 is an external view of an information processing apparatus for divers according to an embodiment.
As shown in FIG. 1, an information processing device for divers (hereinafter referred to as a dive computer) 1 measures the amount of nitrogen accumulated in the body during diving (nitrogen partial pressure in the body). It displays the downtime that should be taken. This dive computer 1 has an arm band 3 on the 6 o'clock side and 12 o'clock side of the wrist
4 are connected to each other, and these arm bands 3 and 4 can be used by being worn on the arm like a wristwatch. In the apparatus main body 2, an upper case and a lower case are fixed by a method such as screwing in a completely watertight state, and a substrate (not shown) on which various electronic components and the like are mounted is accommodated therein. The power supply for the entire apparatus is a button-type battery (not shown) built in the apparatus body 2.

The display unit 10 using the liquid crystal display panel 11 is configured on the upper surface side of the apparatus main body 2, and switches A and B including two push buttons are configured on the 6 o'clock side of the wristwatch. For this reason, switch operation is easy even during diving. The switches A and B are, as will be described later, an operation unit 5 for selecting and switching each mode performed in the dive computer 1.
It is. Of the upper surface side of the apparatus main body 2, on the 9 o'clock side of the wristwatch, a water incoming monitoring switch 30 (moisture detection sensor) for monitoring whether or not diving is started is configured.

This incoming water monitoring switch 30 has two electrodes 30A, 30 exposed on the upper surface of the apparatus main body.
B, these electrodes 30A and 30B are conducted with seawater or the like, and it is determined that water has entered when the resistance value between the electrodes 30A and 30B becomes small. However, the incoming monitoring switch 30 is used only to detect that water has entered, and to shift to a diving mode to be described later, and does not detect that one tie has been started. In other words, the arm on which the dive computer 1 is mounted may have just been submerged in seawater, and in such a case, it should not be treated as having started diving. Therefore, in the dive computer 1 of the present embodiment, the water depth (water pressure) is greater than a certain level by the pressure sensor built in the apparatus main body, for example, in this embodiment, the water depth is deeper than 1.5 m (water depth value for diving start determination). Is considered to have started diving.

FIG. 2 is a schematic configuration block diagram of the information processing apparatus for divers according to the embodiment.
As shown in FIG. 2, the dive computer 1 of the present embodiment includes a liquid crystal display panel 11 for displaying various types of information and notifying a user, and a display unit 10 including a liquid crystal driver 12 for driving the liquid crystal display panel 11, A control unit 50 (control unit) that performs processing in each mode and causes the liquid crystal display panel 11 to perform display according to each mode is configured. To the control unit 50, outputs from the switches A and B and the water monitoring switch 30 are input.
Since the dive computer 1 displays the normal time and measures the dive time, the clock output from the oscillation circuit 31 is input to the control unit 50 via the frequency dividing circuit 32, and the time counter 33 is used. Thus, a time measuring unit 68 for measuring time in units of 1 second is configured.

The dive computer 1 measures and displays the water depth during diving and measures the amount of nitrogen gas (inert gas) accumulated in the body from the water depth (water pressure) and the dive time. A sensor 34 (semiconductor pressure sensor), an amplification circuit 35 for the output signal of the pressure sensor 34, and an A / D conversion circuit 36 that converts an analog signal output from the amplification circuit 35 into a digital signal and outputs it to the control unit 50. The water depth measurement part 61 provided with is comprised. Here, the pressure sensor 34 may be a combination of water depth measurement and atmospheric pressure measurement, or may be a separate body. If the combination of water depth measurement and barometric pressure measurement is used, the portable size can be reduced, and the difference in the reference value of the pressure value at a water depth of 0 meter and an altitude of 0 meter can be easily adjusted.
Note that the pressure sensor 34 configured in the present embodiment is configured to be used for both water depth measurement and atmospheric pressure measurement.

Furthermore, the dive computer 1 of the present embodiment includes a sound reporting device 37 and a vibration generating device 38, and can issue a warning audibly by the sound reporting device 37 and tactilely by the vibration generating device 38. It is. As the amount of nitrogen dissolved in the body increases, nitrogen has an anesthetic effect,
Since the diver himself may not be conscious, he may be in a state of consciousness. With these warning functions, safer diving is possible. Especially for a body whose situation judgment / danger recognition is dull, the vibration generator 38 can issue a warning to a diver as a more powerful stimulus than other warning functions.
The control unit 50 includes a CPU 51 that controls the entire apparatus, a control circuit 52 that controls the liquid crystal driver 12 and the time counter 33 under the control of the CPU 51, a ROM 53, and an R
The CPU 51 is composed of an AM 54 and based on a program stored in the ROM 53.
Each mode which will be described later is realized by each processing performed by. The RAM 54 is used as a memory for temporarily recording various data (diving information) obtained during diving, a memory for recording log data for reproducing diving information in a log mode described later, and the like.

[1.1] Description of Display Unit The display state on the liquid crystal display panel 11 will be described again with reference to FIG.
In the case of the present embodiment, the display area of the liquid crystal display panel is a current water depth data display area 11A, a dive time data display area 11B, a maximum water depth data display area 11C, a no-decompression dive time (N
DL) data display area 11D, body nitrogen partial pressure data display area 11E, required stop state display area 11F, remaining stop time display area 11G in stop water depth area, and skill level display area 11H of diver action at stop water depth Divided into eight display areas.
Specifically, in the case of the example of FIG. 1, as shown in the display areas 11A to 11G, current water depth data = 13.1 m, diving time data = 27 minutes, maximum water depth data = 28.7 m, non-decompression diving possible time (NDL) data = 123 minutes, internal nitrogen partial pressure data = 4 bar graphs lit, required stop state = deep stop at 13 m, remaining stop time at stop water depth = 32 seconds, diver at stop water depth The skill level of action is 2 (level).
That is, in the state shown in FIG. 1, 27 minutes have passed since the start of diving and diving to a maximum depth of 28.7 m, and the current diver is located at a depth of 13.1 m. Further, it is possible to continue the no-decompression diving for another 123 minutes, and it is displayed that the current nitrogen partial pressure in the body is at a level where four marks in the body nitrogen graph are lit. Furthermore,
A DSTOP indicating a deep stop is required, and its water depth is 13m, currently 13.1m
This means that the remaining 32 seconds are required to be stopped, and that the skill level of the diver's action at the depth of the stop water is currently the highest level 2 is displayed.

[1.2] Configuration of Safety Information Deriving Unit FIG. 3 shows the amount of accumulated nitrogen in the body (the amount of accumulated inert gas in the body) in the dive computer 1 of the present embodiment. It is a functional block diagram of a safety information deriving unit for deriving safety information such as a no-decompression diving possible time.
In FIG. 3, the dive computer 1 simulates the state in which nitrogen contained in inhalation is absorbed into and discharged from the body, and calculates the amount of nitrogen in the body (partial nitrogen partial pressure). 60 is configured.
Based on the amount of nitrogen in the body, the safety information deriving unit 60 determines how many hours of non-decompression diving can be performed at a certain depth (non-decompression diving possible time) and which nitrogen has dissolved excessively in the body in the previous diving. It is configured that a diver derives safety information for safely diving whether the gas is discharged at a proper time (in-body nitrogen discharging time / in-body inert gas discharging time). The calculation of the amount of nitrogen in the body described below is merely an example, and various methods can be used. Therefore, here, an example will be briefly described.

In the safety information deriving unit 60, first, a water depth measuring unit 61 using the pressure sensor 34, the amplification circuit 35, and the A / D conversion circuit 36 shown in FIG.
Respiratory nitrogen partial pressure calculation unit 62 realized as functions of CPU 51, ROM 53, and RAM 54 shown in FIG. 2, respiratory nitrogen partial pressure storage unit 63 using RAM 54 shown in FIG. 2, CPU 51 shown in FIG. Body nitrogen partial pressure calculation unit 6 realized as a function of ROM 53 and RAM 54
4 is realized as a function of the in-vivo nitrogen partial pressure storage unit 65 using the RAM 54 shown in FIG. 2, the time measuring unit 68 using the time counter 33 shown in FIG. 2, the CPU 51, the ROM 53, and the RAM 54 shown in FIG. The half-saturation time selection realized as a function of the comparison unit 66 that compares the data stored in the respiratory nitrogen partial pressure storage unit 63 and the internal nitrogen partial pressure storage unit 65, and the CPU 51, ROM 53, and RAM 54 shown in FIG. A part 67 is configured.

Of these components, the respiratory nitrogen partial pressure calculation unit 62, the in-vivo nitrogen partial pressure calculation unit 64, the comparison unit 66, and the half-saturation time selection unit 67 are implemented as software in the CPU 51, ROM 53, and RAM 54 of FIG. Although it can be realized, it is also possible to realize only by a logic circuit which is hardware or a combination of a logic circuit and a processing circuit including a CPU and software.
In this configuration example, the water depth measurement unit 61 measures and outputs the water pressure P (t) corresponding to the time t.
The respiratory air nitrogen partial pressure calculator 62 calculates and outputs the respiratory air nitrogen partial pressure PIN2 (t) based on the water pressure P (t) output from the water depth measuring unit 61. The respiratory nitrogen partial pressure PIN2 (t) can be calculated from the water pressure P (t) during diving by the following formula.
PIN2 (t) = 0.79 × P [bar]

The respiratory air nitrogen partial pressure storage unit 63 stores the value of PIN2 (t) calculated by the respiratory air nitrogen partial pressure calculation unit 62 as shown in the above equation.
The body nitrogen partial pressure calculator 64 calculates the body nitrogen partial pressure P for each tissue having different nitrogen absorption / extraction rates.
GT (t) is calculated. Taking one tissue as an example, the nitrogen partial pressure PGT (tE) in the body that is absorbed / exhausted from the dive time t = t0 to tE is the partial nitrogen pressure PGT (t0 in the body at the time t0).
), Dive time tE, and half-saturation time TH.
Here, the half-saturation time TH is a process in which the body nitrogen partial pressure PGT (tE) reaches the respiratory nitrogen partial pressure PIIG under the water pressure from the body nitrogen partial pressure PGT (t0) in the initial state (at time t0). This corresponds to the time (half time) required to reach an intermediate pressure value between the body nitrogen partial pressure PGT (t0) and the respiratory nitrogen partial pressure PIIG.

As a result, as shown in FIG. 3, the internal nitrogen partial pressure storage 6
5 is stored. The calculation formula for this is as follows.
PGT (tE) = PGT (t0)
+ {PIN2 (t0) -PGT (t0)}
X {1-exp (-K (tE-t0) / HT)}
Here, k is a constant obtained experimentally.
Next, the comparison unit 66 compares PIN2 (t), which is the result of the respiratory nitrogen partial pressure storage unit 63, with PGT (t), which is the result of the in-vivo nitrogen partial pressure calculation unit 64. The selection unit 67 makes the half-saturation time TH used in the in-vivo nitrogen partial pressure calculation unit 64 variable.
For example, respiratory air nitrogen partial pressure PIN2 (t0) at t = t0, body nitrogen partial pressure PGT (t0
) Are stored in the respiratory nitrogen partial pressure storage unit 63 and the in-vivo nitrogen partial pressure storage unit 65, respectively, the comparison unit 66 compares the PIN2 (t0) with the PGT (t0).

The body nitrogen partial pressure calculation unit 64 is controlled by the half-saturation time selection unit 67 as follows to calculate the body nitrogen partial pressure PGT (tE) when t = tE.
When PGT (t0)> PIN2 (t0) PGT (tE) = PGT (t0) + {PIN2 (t0) −PGT (t0)}
X {1-exp (-K (tE-t0) / HT1)}
When PGT (t0) <PIN2 (t0) PGT (tE) = PGT (t0) + {PIN2 (t0) −PGT (t0)}
X {1-exp (-K (tE-t0) / HT2)}
In these cases, HT2 <HT1.
If PGT (t0) = PIN2 (t0),
PGT (tE) = PGT (t0)
It becomes.

Also, these times (measurements for t0 and tE) are managed by the time measuring unit 68 of FIG.
Here, when PGT (t0)> PIN2 (t0), nitrogen is discharged from the body, and when PGT (t0) <PIN2 (t0), nitrogen is absorbed into the body. . Changing the half-saturation time at these times means that when nitrogen is discharged, the half-saturation time is long and it takes time to discharge, and conversely, when nitrogen is absorbed, the half-saturation time is long. The time required for absorption is short compared to the time required for discharge. In this way, the simulation of the amount of nitrogen in the body can be performed more strictly. Therefore, if the permissible value of nitrogen partial pressure in the body is set, the time required to reach this value at a certain depth (water pressure) (no decompression dive time / safety information) and the nitrogen partial pressure in the body on the water surface Can be obtained with high accuracy the time until the pressure falls to the equilibrium value (intracorporeal nitrogen excretion time / safety information).
In this way, the dive computer 1 according to the present embodiment includes the dive possible time deriving unit 92 and the nitrogen discharge time deriving unit 91 for deriving the no-decompression diving possible time and the nitrogen discharge time as the safety information of the diver.

FIG. 4 is a flowchart (part 1) of the ups and downs management process. FIG. 5 is a flowchart (part 2) of the ups and downs management process.
When it is necessary to stop in the water, the control unit 50 of the information processing apparatus for divers initializes the stop water depth SD and initializes the stop time count value t and the water depth difference integrated value sd, and t = 0, It is set as sd = 0 (step S11). Here, the water depth difference integral value sd is
This is a value obtained by integrating the difference between the stop water depth SD and the current water depth D, which is the actual water depth measured (step S11).
Next, it is determined whether the value ΔD of current water depth D−stop water depth SD is within 1.0 m (step S12). That is,
ΔD ≦ 1.0 (m)
It is determined whether or not.
In the determination of step S12,
ΔD> 1.0 (m)
If this is the case (step S12; No), a standby state is entered, and the determination in step S12 is performed again after a predetermined time (in this embodiment, after 1 second).

In the determination of step S12,
ΔD ≦ 1.0 (m)
If it becomes (step S12; Yes), it is determined that the stop at the stop water depth has started, and the stop time tmax corresponding to the stop content is set (step S13).
Here, the stop time tmax is tmax = 1 minute at the time of stop at a deep depth during non-decompression diving (in this embodiment, this stop is also handled as a safe stop for convenience). At the time of safe stop, tmax = 3 minutes. Moreover, the decompression stop at the time of decompression diving sets the stop time at the stop depth calculated from the partial pressure of nitrogen in the body as it is.
When the current water depth D is acquired at a sampling timing every predetermined time (in this embodiment, every second) (step S14), the control unit 50 calculates a difference Δd between the stop water depth SD and the current water depth D by the following equation. (Step S15).
Δd = SD−D

Next, the control unit 50 calculates a water depth difference integrated value sd of the difference Δd between the stop water depth SD and the current water depth D by the following equation (step S16).
sd = sd + | Δd |
Here, the reason why the absolute value of the difference Δd is used is to determine how close the water stop is to the stop water depth SD.
When the calculation corresponding to the sampling timing is completed,
t = t + 1
And counting up as
Remaining time = tmax−t
Is calculated and displayed (step S17).

Next, it is determined whether or not the current stop time count value t is equal to the set stop time tmax (step S18).
In the determination of step S18,
t <tmax
If it is (step S18; No), since the stop time tmax has not elapsed, the control unit 50 shifts the process to step S14 again, and performs the same process thereafter at the next sampling timing.
In the determination of step S18,
t = tmax
(Step S18; Yes), since the required stop time tmax has elapsed, the skill level data SL when the diver stops is calculated by the following equation (step S19).
SL = sd / tmax

The skill level data SL is data representing how much the water level is close to the stop water depth SD during the stop time tmax.
Then, the control unit 50 determines whether or not the calculated skill level data SL satisfies the following expression (step S20).
SL ≦ 1 (m)
In the determination of step S20,
SL> 1 (m)
(Step S20; No), it is determined whether or not the calculated skill level data SL satisfies the following equation (step S21).
SL ≧ 2 (m)
In the determination of step S21,
SL ≧ 2 (m)
If it is (step S21; Yes), it is determined that the stop has many errors with respect to the stop water depth SD, and the water depth value DC used for the calculation of the body nitrogen partial pressure is determined from the next timing as the current water depth value D + 0. The water depth correction value S is set to 0.6 (m) so as to be calculated as a value of .6 m (step S22), and the process proceeds to step S25.

In the determination of step S21,
SL <2 (m)
(Step S21; No), that is,
1 (m) <SL <2 (m)
In this case, it is determined that the stop has a slight error with respect to the stop water depth SD, and the water depth value DC used for calculating the nitrogen partial pressure in the body is determined as the current water depth value D + 0.3 m from the next timing. As calculated, the water depth correction value S is set to 0.3 (m) (step S23), and the process proceeds to step S25.
In the determination of step S20,
SL ≦ 1 (m)
In this case (step S20; Yes), it is determined that the stop has little error with respect to the stop water depth SD, and the in-vivo nitrogen partial pressure calculation water depth value DC used for the calculation of the in-vivo nitrogen partial pressure is calculated from the next timing. Current depth value D + 0m, ie,
DC = D
As described above, the water depth correction value S = 0 (m) is set (step S24), and the process proceeds to step S25.

Subsequently, the control unit 50 uses the skill level data S on the behavior of the diver at the stop water depth.
Evaluation is performed based on L, and the skill level is displayed in the skill level display area 11H in three stages of skill level = 0 → 1 → 2 from the lower skill level (step S25).
Subsequently, the control unit 50 continues the calculation of the in-vivo nitrogen partial pressure using the new in-vivo nitrogen partial pressure calculation water depth value DC (step S26).
Subsequently, the control unit 50 determines whether or not a safe stop to be performed immediately before ascent is performed (step S27).
If it is determined in step S27 that a safe stop has not yet been made (step S27).
27; No), the process again proceeds to step S11, and the same process is performed thereafter.
If it is determined in step S27 that a safe stop has already been made (step S27;
Yes) After the diver has surfaced on the surface of the water, finished diving, and stopped on the surface of the water (step S28), it is determined whether or not nitrogen in the body still remains based on the calculated partial pressure of nitrogen in the body (step S29). ). In this case, the elapsed time from when it is determined that the dive has ended is measured as the water surface pause time.

If it is determined in step S29 that the body nitrogen still remains after the surface is stopped (step S29; Yes), the body nitrogen partial pressure calculation depth value DC used in the next diving is used.
Is set by the following equation using the current water depth value D and the water depth correction value S obtained in steps S22 to S24, and the process is terminated (step S30).
DC = D + S
In the determination of step S29, if there is no body nitrogen remaining after the water surface is stopped (or a state where it is determined that there is not enough body nitrogen remaining) (step 29; No),
Assuming that the next diving is in a normal state, the in-vivo nitrogen partial pressure calculation water depth value DC used in the next diving is set as the current water depth value as shown in the following equation, and the processing is terminated (step S31). S31).
As described above, according to the present embodiment, it is possible to perform the process on the safe side by effectively calculating a short time for the no-decompression diving.

FIG. 6 is a flowchart of a variation management process according to a modification. In this modification, the process up to step S20 is the same as the flowchart (part 1) of the ups and downs management process of FIG.
This modification is a person who changes the coefficient for multiplying the permissible supersaturated nitrogen amount Ptol of each tissue instead of the water depth correction value S used in FIG.
The control unit 50 determines whether or not the calculated skill level data SL satisfies the following expression (step S20).
SL ≦ 1 (m)
In the determination of step S20,
SL> 1 (m)
(Step S20; No), it is determined whether or not the calculated skill level data SL satisfies the following equation (step S21).
SL ≧ 2 (m)

In the determination of step S21,
SL ≧ 2 (m)
(Step S21; Yes), it is determined that the stop has a lot of errors with respect to the stop water depth SD, and from the next timing, the allowable supersaturated nitrogen amount Ptol of the tissue is multiplied by a coefficient 0.8 for calculation. The permissible supersaturated nitrogen amount M (step S22A), and the process proceeds to step S25.
In the determination of step S21,
SL <2 (m)
(Step S21; No), that is,
1 (m) <SL <2 (m)
If it is, it is determined that the stop has a little error with respect to the stop water depth SD, and the allowable supersaturated nitrogen amount for calculation is calculated by multiplying the allowable supersaturated nitrogen amount Ptol of the tissue by a coefficient 0.9 from the next timing. M (step S23A), the process proceeds to step S25.

In the determination of step S20,
SL ≦ 1 (m)
In the case of (Step S20; Yes), it is determined that the stop has little error with respect to the stop water depth SD, and the allowable supersaturation for calculation is performed by multiplying the allowable supersaturated nitrogen amount Ptol of the tissue by the coefficient 1 from the next timing. Nitrogen amount M (step S24A), that is,
M = Ptol
And the process proceeds to step S25.
Subsequently, the control unit 50 uses the skill level data S on the behavior of the diver at the stop water depth.
Evaluation is performed based on L, and the skill level is displayed in the skill level display area 11H in three stages of skill level = 0 → 1 → 2 from the lower skill level (step S25).
Subsequently, the control unit 50 continues the calculation of the internal nitrogen partial pressure using the new allowable persaturated nitrogen amount M for calculation (step S26A).
Subsequently, the control unit 50 determines whether or not a safe stop to be performed immediately before ascent is performed (step S27).

If it is determined in step S27 that a safe stop has not yet been made (step S27).
27; No), the process again proceeds to step S11, and the same process is performed thereafter.
If it is determined in step S27 that a safe stop has already been made (step S27;
Yes) After the diver has surfaced on the surface of the water, finished diving, and stopped on the surface of the water (step S28), it is determined whether or not nitrogen in the body still remains based on the calculated partial pressure of nitrogen in the body (step S29). ). In this case, the elapsed time from when it is determined that the dive has ended is measured as the water surface pause time.
If it is determined in step S29 that the body nitrogen still remains after the surface is stopped (step S29; Yes), steps S22A to S24 are performed in the next diving.
Using the permissible supersaturated nitrogen amount M for calculation obtained in A, the process is terminated assuming that the calculation is performed (step S30A).
In the determination of step S29, if there is no body nitrogen remaining after the water surface is stopped (or a state where it is determined that there is not enough body nitrogen remaining) (step 29; No),
Assuming that the next diving is in a normal state, the processing is terminated assuming that the calculation is performed using the allowable supersaturated nitrogen amount M for calculation in the next diving as the permissible supersaturated nitrogen amount Ptol of the tissue (step S31A).
As described above, also according to the present modification, it is possible to perform the process on the safe side by effectively calculating the non-decompression diving possible time.

[2] Effect of Embodiment As described above, when there are many water depth errors at the time of stop (safe stop) with respect to the stop water depth, that is, when neutral buoyancy cannot be maintained, the diver stops. Every time you move away from the water depth,
Repeated rapid action to approach the depth of the stop. When you are mentally concentrated in this way, you breathe more than necessary and take in inert gas into your body, but according to this embodiment, you are not only at the water depth value, but away from the stop water depth value. By using the degree as a parameter for the calculation of the partial pressure of nitrogen in the body, it is possible to provide information with a high degree of safety according to the actual diving behavior.
[3] Modifications of Embodiment In the above description, the level of safety stop is represented by a number. However, it may be easy to understand by displaying characters such as “Jozu”, “A little more”, “Do your best”. .
In the above description, the program is stored in advance in the ROM 53 in order to perform the various operations described above.
However, the present invention is not limited to this, and is connected to a personal computer or server computer (not shown) via a communication cable or network, and the program is downloaded from the personal computer or server computer. Form may be sufficient. In this case, the program is stored in a rewritable nonvolatile memory (not shown) in the information processing apparatus for divers. And the control part 50 should just read a program from this non-volatile memory, and may perform this.

It is an external view of the information processing apparatus for divers of an embodiment. It is a block diagram of the whole dive computer to which the present invention is applied. It is a functional block diagram of a safety information deriving unit. It is a flowchart (the 1) of ups and downs management processing. It is a flowchart (the 2) of ups and downs management processing. It is a flowchart of the ups and downs management process of a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Dive computer, 2 ... Apparatus main body, 3 ... Arm band, 5 ... Operation part, t0 ... Time, 1
DESCRIPTION OF SYMBOLS 0 ... Display part, 11 ... Liquid crystal display panel, 11A ... Current water depth data display area, 11B ... Dive time data display area, 11C ... Maximum water depth data display area, 11D ... Non-decompression diving possible time data display area, 11E ... Body nitrogen Partial pressure data display area, 11F... Stop state display area, 11G
... remaining stop time display area, 11H ... skill level display area, 12 ... liquid crystal driver, 30 ...
Inlet monitoring switch, 30A ... electrode, 31 ... oscillator circuit, 32 ... frequency divider circuit, 33 ... time counter, 34 ... pressure sensor, 35 ... amplifier circuit, 36 ... A / D converter circuit, 37 ... sound signal generator, 3
DESCRIPTION OF SYMBOLS 8 ... Vibration generator, 50 ... Control part, 51 ... CPU, 52 ... Control circuit, 53 ... ROM, 54
... RAM, 60 ... safety information deriving unit, 61 ... water depth measuring unit, 62 ... respiratory nitrogen partial pressure calculating unit, 6
3 ... Respiratory nitrogen partial pressure storage unit, 64 ... In-body nitrogen partial pressure calculation unit, 65 ... In-body nitrogen partial pressure storage unit, 6
DESCRIPTION OF SYMBOLS 6 ... Comparison part, 67 ... Semi-saturation time selection part, 68 ... Time measuring part, 69 ... Atmospheric pressure measurement part, 91 ... Nitrogen discharge | emission time deriving part, 92 ... Dive time deriving part, D ... Current depth value, DC ... Nitrogen in the body Divided pressure calculation water depth value, S ... water depth correction value, SD ... stop water depth, SL ... skill level data, TH ... half saturation time, sd ... water depth difference integral value, t ... stop time count value, tmax ... stop time.

Claims (12)

A stability calculation unit that obtains the stability of the water depth change during the safe stop based on the difference between the actual water depth of the diver during the safe stop and the predetermined safe stop water depth;
An inert gas amount calculation unit that calculates the amount of inert gas accumulated in the body by effectively shortening the no-decompression diving possible time according to the stability;
An information processing apparatus for divers, comprising: The information processing apparatus for divers according to claim 1,
Depth setting for calculation that sets the calculation water depth used for calculation of the amount of inert gas accumulated in the body according to the stability to a higher depth side than the actual water depth in order to effectively reduce the non-decompression diving possible time Part
The inert gas amount calculation unit calculates the in-body accumulated inert gas amount based on the calculation water depth.
An information processing apparatus for divers characterized by the above. The information processing apparatus for divers according to claim 2,
The calculation depth setting unit sets the calculation water depth by adding a correction water depth determined based on the stability to the actual water depth.
An information processing apparatus for divers characterized by the above. In the information processing apparatus for divers according to claim 2 or claim 3,
The information processing apparatus for divers, wherein the stability calculation unit calculates the stability based on an average value of a difference between the actual water depth per unit time and the safe stop water depth. The information processing apparatus for divers according to claim 3,
Determine whether the body inert gas remains at the time of surface pause,
The calculation depth setting unit sets the calculation water depth using the correction water depth at the time of the next dive when the body inert gas remains at the time of the water surface pause. Processing equipment. The information processing apparatus for divers according to claim 1,
A calculation allowable oversaturated nitrogen amount setting unit for reducing the predetermined allowable oversaturated nitrogen amount of each tissue and setting the allowable oversaturated nitrogen amount for calculation in accordance with the stability in order to effectively reduce the non-decompression diving possible time. Prepared,
The inert gas amount calculation unit calculates the in-body accumulated inert gas amount based on the calculation allowable persaturated nitrogen amount for calculation.
An information processing apparatus for divers characterized by the above. The information processing apparatus for divers according to claim 6,
The calculation allowable supersaturated nitrogen amount setting unit sets the calculation allowable persaturated nitrogen amount by multiplying the predetermined allowable supersaturated nitrogen amount by a correction coefficient determined based on the stability.
An information processing apparatus for divers characterized by the above. In the information processing apparatus for divers according to claim 6 or 7,
The information processing apparatus for divers, wherein the stability calculation unit calculates the stability based on an average value of a difference between the actual water depth per unit time and the safe stop water depth. The information processing apparatus for divers according to claim 8,
Determine whether the body inert gas remains at the time of surface pause,
The calculation-use allowable supersaturated nitrogen amount setting unit sets the calculation-use allowable supersaturated nitrogen amount using the current correction coefficient during the next dive when the body inert gas remains when the water surface is stopped. An information processing apparatus for divers characterized by the above. In the information processing apparatus for divers according to any one of claims 1 to 9,
An information processing apparatus for divers, comprising: a notifying unit that notifies the diver of the stability. Based on the difference between the actual water depth of the diver at the time of safe stop and the predetermined safe stop water depth, a stability calculation process for determining the stability of the water depth change at the time of safe stop,
An inert gas amount calculating step of calculating the amount of inert gas accumulated in the body by effectively shortening the no-decompression diving possible time according to the stability;
A method for controlling an information processing apparatus for divers, comprising: In a control program for controlling an information processing apparatus for divers by a computer,
Based on the difference between the actual water depth of the diver during the safe stop and the predetermined safe stop water depth, the stability of the water depth change during the safe stop is calculated.
According to the stability, it is possible to calculate the amount of inert gas accumulated in the body by effectively reducing the no-decompression diving possible time,
A control program characterized by that.

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