JPH10103594A - Gas supply device - Google Patents

Abstract

(57) [Summary] An object of the present invention is to take a long time to calculate a valve opening of a control valve. SOLUTION: A control device 34 of a gas supply device 1 calculates a filling flow rate and a filling pressure based on signals output from a mass flow meter 20 and a pressure transmitter 22, and also controls a compressor 12, on-off valves 14, 17 and a gas supply. The on-off valve 19 and the control valve 21 are controlled. The control device 34 includes a membership function creating unit 34A that creates a membership function (attribution degree function) according to the secondary pressure change detected by the pressure transmitter 22 and the charging time, and a valve opening of the control valve 21. There is a control amount calculating means 34B for calculating a control amount corresponding to the degree based on the membership function. Therefore, the control device 34
Is based on the calculated membership function.
The fuzzy control of the pressure and the flow rate of the fuel tank 3 is performed by calculating the valve opening degree of the first valve. Therefore, the calculation speed is increased, the control delay of the control valve 21 is eliminated, and the pressure fluctuation can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas supply device, and more particularly to a gas supply device configured to fill a tank to be filled with compressed gas.

[0002]

2. Description of the Related Art Compressed natural gas (CN) obtained by compressing natural gas
Along with the development of a vehicle (CNG vehicle) that runs on G) as a fuel, a gas supply device that supplies compressed natural gas to a fuel tank of the vehicle has been put into practical use.

[0003] In this type of gas supply device, a control valve for controlling the pressure or flow rate of the gas to be filled in a pipe to be filled with a gas, and a pressure transmission for detecting the pressure of the gas supplied from the control valve. Device (pressure detecting means) and a flow meter for detecting the flow rate of the gas supplied from the control valve,
The control device is configured to calculate the valve opening degree of the control valve according to the pressure value measured by the pressure transmitter or the flow value measured by the flow meter.

In the control device of the gas supply device, CN
When gas filling of the fuel tank of the G car is started, a pressure or a flow rate according to the capacity of the fuel tank as a tank to be charged is calculated, and the valve opening of the control valve is controlled to be constant based on the calculation result. Pressure rise control or constant flow rate control is performed.

[0005] During the gas filling, the flow rate and pressure detection signals output from the flow meter and the pressure transmitter provided in the dispenser unit are fed back to the control device, so that the control device is filled. The valve opening of the control valve is calculated so that the flow rate and the pressure become target values according to the passage of time, and the valve opening of the control valve is controlled.

[0006]

In the conventional gas supply apparatus, the valve opening of the control valve of the CNG dispenser is adjusted so that the flow rate and the pressure of the model tank become a predetermined flow rate or pressure as the filling time elapses. Was controlled. Further, since the tank pressure on the filling side (pressure of the fuel tank of the CNG vehicle) cannot be directly measured, when the pressure value obtained from the pressure transmitter provided in the dispenser exceeds the target pressure, the pressure is not measured. The control valve was closed by judging that the gas filling into the filling tank was completed.

FIG. 9 is a graph showing theoretical values (values when a model is used) of the valve opening of the control valve, the measured flow rate, the measured pressure, and the pressure of the tank to be filled when performing the gas filling control. . FIG. 10 is a graph in which the flow rate measurement value, the pressure measurement value, and the pressure change of the filling tank are experimentally obtained when the valve opening of the control valve is controlled as shown in FIG.

In FIGS. 9 and 10, the valve opening of the control valve is indicated by a broken line, the flow rate measurement value is indicated by a solid line, the pressure measurement value is indicated by a one-dot chain line, and the pressure of the tank to be filled is indicated by a two-dot chain line. Is shown. Originally, it is desirable that the pressure and the flow rate during the gas filling control stably change as shown in FIG. However, actually, as shown in FIG. 10, the gas is charged while the pressure and the flow rate frequently fluctuate and vibrate. As described above, the reason why the pressure and the flow rate oscillate is that, since the control amount of the control valve is calculated based on the model, a difference occurs between the control amount and the actual control amount of the gas filling system and a control delay occurs. .

In the conventional method, it was not possible to estimate at all how long the gas pressure fluctuation due to the current control valve opening / closing degree appears due to non-linearity due to the viscous resistance of the gas. Therefore, the control of the control valve for keeping the gas pressure constant has no effect even if it is performed in real time.

In the conventional apparatus, since the waiting time from the input of the measured values of the pressure and the flow rate to the output of the calculation result is long, a control delay of the control valve occurs, and the pressure fluctuates at a certain amplitude due to the control delay. Since the pressure rises while the filling is not actually completed, the pressure measurement value may instantaneously exceed the target pressure even though the filling is not completed.

At this time, the control device determines that the tank pressure on the filling side has reached the target pressure and closes the control valve even though it is still necessary to perform gas filling. There is a problem that the gas filling is terminated even though the pressure has not reached the target pressure.

Accordingly, an object of the present invention is to provide a gas supply device that solves the above-mentioned problems.

[0013]

In order to solve the above problems, the present invention has the following features. The present invention provides a control valve for controlling a pressure or a flow rate filled in a tank to be filled, a pressure detecting means for detecting a pressure of a gas supplied from the control valve, and a pressure value detected by the pressure detecting means. And a calculating means for calculating a valve opening of the control valve in response to the change in the secondary pressure detected by the pressure detecting means and a filling time. The control amount corresponding to the valve opening of the control valve is calculated based on the membership function.

Therefore, according to the present invention, a membership function corresponding to the change in the secondary pressure detected by the pressure detecting means and the charging time is created, and the control amount corresponding to the valve opening of the control valve is determined by the membership function. , The linearity of the gas can be compensated, so that the valve opening of the control valve can be controlled so that the pressure and the flow rate are stabilized.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an embodiment of the gas supply device according to the present invention. The gas supply device 1 is installed, for example, at a gas supply station that supplies compressed natural gas (CNG) obtained by compressing city gas to a predetermined pressure to a fuel tank (filled tank) 3 of an automobile 2.

The gas supply device 1 generally includes a pressure generation unit 4 for compressing city gas to a predetermined pressure to generate a pressurized gas, and a gas supply unit 1 for supplying the gas compressed by the pressure generation unit 4 to the fuel tank 3. Of the dispenser unit 5. The pressure generating unit 4 includes a multi-stage compressor 12 disposed in a branch line 11 branched from a medium-pressure line (not shown) of city gas. Further, a compressor opening / closing valve 14 that opens and closes the pipeline 13 to supply or shut off the gas discharged from the compressor 12 is provided in the pipeline 13 drawn from the discharge port of the compressor 12.

An end of the pipe 15 connected to the pipe 13 is connected to a gas accumulator 16. The gas accumulator 16 is generally called a “gas accumulator” in literatures and the like. In addition, a gas accumulator opening / closing valve 17 that opens and closes the pipe 15 to supply or shut off the gas accumulated in the gas accumulator 16 is provided in the pipe 15. In addition, pipeline 1
A gas supply pipe 18 extending to the dispenser unit 5 is connected to a connection portion between the pipe 3 and the pipe 15.

The compressor 12 includes on-off valves 14 and 17
Is opened and the valve in the dispenser unit 5 is driven in a closed state, the high-pressure gas compressed by the compressor 12 is supplied to the gas accumulator 16. still,
In this embodiment, the compressor 12 has two gas accumulators 16.
Supply compressed gas until the pressure rises to 50 kgf / cm ² . When the pressure of the gas accumulator 16 reaches 250 kgf / cm ² , the compressor 12 stops, and the on-off valve 14,
The valve 17 is closed, and the pressure generating unit 4 enters a standby state in which a filling operation can be performed.

The pressure generating unit 4 and the dispenser unit 5 are connected via a gas supply pipe 18. The gas supply line 18 extending into the dispenser unit 5 includes, in order from the upstream side, a gas supply opening / closing valve 19 formed of an electromagnetic valve and communicating or blocking the gas supply line 18, and a gas supply line 18. A mass flow meter 20 for measuring a supply amount of flowing gas, a control valve 21 for controlling a gas supplied to a downstream side (filling side), and a pressure transmission for detecting a secondary pressure controlled by the control valve 21 (Pressure detecting means) 22 is provided.

A gas filling hose 23 communicates with the downstream end of the gas supply pipe 18.
A manual three-way valve 24 is connected to the downstream end of the valve. The three-way valve 24 has an inlet port a to which the gas filling hose 23 is connected, and an exhaust port b to which the exhaust pipe 25 is connected.
And a filling port c to which the connection coupler 26 is connected. The three-way valve 24 is operated in a state where the inflow port a and the filling port c communicate with each other at the time of gas filling, and the exhaust port b and the filling port c communicate with each other when performing the depressurizing operation after the gas filling is completed. And the pressure in the connection coupler 26 is reduced.

On the side surface of the dispenser unit 5, a coupler hooking portion 29 for hooking the connecting coupler 26 is attached. The coupler hooking portion 29 detects the presence or absence of the connecting coupler 26 by a coupler hooking switch. 30 are provided. Further, the dispenser unit 5 is provided with a filling start button 31, a filling stop button 32, and an emergency stop button 33.

The filling start button 31 is connected to the connection couplers 26 and 36.
Is a switch button operated to open the gas supply opening / closing valve 19 after being connected. The filling stop button 32 is a switch button operated to close the gas supply opening / closing valve 19 and the control valve 21. The emergency stop button 33 is a switch button operated to urgently close all valves.

The control unit 34 includes a compressor 12, on-off valves 14, 17, a gas supply on-off valve 19, a mass flow meter 20,
Control valve 21, pressure transmitter 22, coupler switch 3
0, filling start button 31, filling stop button 32, emergency stop button 33
And so on. Therefore, the control device 34 starts or stops in response to signals from the filling start button 31, the filling stop button 32, and the emergency stop button 33, and fills the fuel tank 3 based on the signals from the mass flow meter 20 and the pressure transmitter 22. The calculated flow rate and pressure are calculated.

The mass flow meter 20 vibrates a pipe called a sensor tube, and the phase difference between the inflow side and the outflow side of the pipe due to Coriolis force corresponding to the gas flow rate flowing in the vibrating pipe is the flow rate. Is a Coriolis-type mass flow meter that measures a flow rate using the fact that it is proportional to

Therefore, the mass flow meter 20 can accurately measure the mass flow rate of the gas compressed to a high pressure, and can measure the flow rate per unit time (or the number of flow pulses per unit time) during the gas filling operation. ) Is output to the control device 34.
Further, the control valve 21 controls the gas supply amount (the flow rate is determined by pressure × time) supplied to the fuel tank 3 by controlling the filling pressure in accordance with a command from the control device 34, and at the time of starting filling and ending the filling. At times, the pressure is controlled so that the filling pressure changes gradually (increase or decrease), thereby preventing each device from being damaged by a sudden change in pressure.

The gas supply opening / closing valve 19 functions as a main valve of the pressure generating unit 4 and automatically opens or closes according to a command from the control device 34. The gas supply on-off valve 19 may be a manual on-off valve instead of the solenoid valve. The three-way valve 24 is configured to be switched by manual operation. Before and after gas charging, the charging port c and the exhaust port b are communicated, and the inflow port a is shut off. Further, at the time of gas filling, switching operation is performed so that the inflow port a and the filling port c communicate with each other and the exhaust port b is shut off.

Reference numeral 35 denotes a display device for displaying a gas filling amount and a filling pressure filled in the fuel tank 3. Further, in the vehicle 2, the connection coupler 36 on the filling side to which the connection coupler 26 of the dispenser unit 5 is connected, and the connection coupler 36.
The fuel tank 3 includes a pipe 37 that communicates with the fuel tank 3, a manual opening / closing valve 38 disposed in the pipe 37, and a check valve 39 that prevents the gas filled in the fuel tank 3 from flowing back.

The ROM 44 of the control device 34 stores a gas supply program for supplying gas to the filling side. Various data are stored in the SRAM 45. Further, the control device 34 includes a membership function creating unit 34A that creates a membership function (attribution degree function) according to the secondary pressure change detected by the pressure transmitter 22 and the filling time, and a valve opening of the control valve 21. There is a control amount calculating means 34B for calculating a control amount corresponding to the degree based on the membership function.

Therefore, the control device 34 controls the control valve 2 based on the membership function calculated as described later.
The fuzzy control of the pressure and flow rate to be charged into the fuel tank 3 by calculating the valve opening degree of No. 1 and calculating the filling flow rate and the filling pressure from the signals output from the mass flow meter 20 and the pressure transmitter 22 to calculate the compressor 12, open / close valve 14, 1
7. The operation of the gas supply on-off valve 19 is also controlled.

Next, a gas filling operation in the gas supply device 1 having the above configuration will be described. When filling the fuel tank 3 of the automobile 2 with gas, the operator firstly connects the connecting coupler 2 to the coupler engaging portion 29 of the dispenser unit 5.
6 is removed and connected to the connecting coupler 36 of the vehicle 2. Then, the operator opens the manual opening / closing valve 38 of the automobile 2 and at the same time, the inflow port a and the filling port c of the three-way valve 24.
The switching operation is performed so that and can communicate with each other.

Next, when the operator turns on the filling start button 31, the control device 34 opens the on-off valve 17 and also opens the gas supply on-off valve 19. This allows
The high-pressure gas accumulated in the gas accumulator 16 is supplied to a gas supply line 18, a gas supply opening / closing valve 19, a mass flow meter 20, and a control valve 2.
1, pressure transmitter 22, gas filling hose 23, three-way valve 2
4. The fuel tank 3 is filled via the connection couplers 26, 36 and the pipe 37.

Immediately after the start of filling, the valve opening of the control valve 21 is slightly reduced in order to calculate the container capacity of the fuel tank 3, and the supply amount to the fuel tank 3 is suppressed to 3 kg / min. When the capacity of the fuel tank 3 is determined, a control law (constant pressure control or constant flow rate control) according to the capacity is obtained.
To start filling the fuel tank 3 with gas.

When the fuel tank 3 is thus filled with gas and becomes full, the pressure of the fuel tank 3 becomes approximately 200 kgf / cm ² . The gas filling amount that has passed through the gas supply line 18 is measured by the mass flow meter 20, and a voltage value (a phase difference between the inflow side and the outflow side) according to the gas filling amount is used as a flow measurement signal by the controller 34. Is output to The control device 34 integrates the supply pressure detected by the pressure transmitter 22 and the flow measurement value from the mass flow meter 20, and displays the amount of gas filling the fuel tank 3 on the display device 35.

When the filling of the fuel tank 3 with the gas is completed, the operator switches the three-way valve 24 so that the exhaust port b and the filling port c communicate with each other and the inflow port a is shut off. Three-way valve 24 and check valve 39
Gas remaining between the exhaust pipe 25 and the exhaust pipe 25
And the pressure in the connection couplers 26 and 36 is reduced to the atmospheric pressure. Thus, the worker can separate the connection couplers 26 and 36 with a small force.

Thereafter, the operator closes the manual opening / closing valve 38 on the side of the vehicle 2 and then disconnects the connection coupler 26 of the dispenser unit 5 from the connection coupler 36 of the vehicle 2.
It is hooked on the coupler hooking section 29. And filling stop button 3
When 2 is turned on, a series of gas filling operations is completed.

Here, the control device 34 which is a main part of the present invention is described.
Will be described. FIG. 2 shows an example of a membership function of the pressure change ΔP. In this embodiment, the pressure change ΔP is classified into five membership functions. For example, the case where the pressure decreases is referred to as “NB (Negative B
ig) ", and the case where the pressure decreases slightly is referred to as" NS (Negative S
mall), "M (Medium)" when the pressure does not change, "PS (Positive Small)" when the pressure slightly increases, and "PB (Positive Big)" when the pressure increases.

Then, each membership function NB,
NS, M, PS, -50kgf / mm 2 the intermediate value of PB, -2
^{5kgf / mm 2, 0kgf / mm} 2, 25kgf / mm 2, 50kgf / mm 2
And Further, a membership function of a triangle centered on each intermediate value is formed. These are intended to determine the coefficient k _f for multiplying the valve opening of each control valve 21 (throttle),
The corresponding values are, for example, NB: 1.4, NS: 1.2,
M: 1.0, PS: 0.8, PB: 0.6.

FIG. 3 shows the membership function versus filling time. The value for the case where the filling time T has sufficiently elapsed differs depending on the tank size of the tank to be filled, but as in the case of the pressure change, an intermediate value is set,
The membership function corresponding to each is a triangle or a trapezoid. This is to correspond to the valve opening (throttle) of the control valve 21, and the corresponding throttle value is NB: 0.35
(35%), NS: 0.1 (10%), M: 1.0 (1
00%), PS: 0.5 (50%), and PB: 0.

FIG. 4 is a PAD showing a processing procedure of a control process executed by the control device 34. First, in step S1 (hereinafter, "step" is omitted), a timer for measuring a filling time is cleared before control is started. Next, the filling time membership function NB,
Calculate values corresponding to NS, M, PS, and PB (S
2).

The following processing is repeated until it is determined that the filling is completed by the pressure transmitter 22 and the pressure value reaches the filling target value (200 kgf / mm ² ) (S 3). First, the time T from the start of filling is measured. This is performed by, for example, incrementing the counter (S4).

Next, a temporary control valve 2 is set by a process A described later.
Valve opening degree of 1 Open is determined (S5). Next, the current pressure value (P
(K)), and the difference from the pressure (P (k−1)) one sample before (Δt before) is taken, and the pressure change ΔP (= P
(K) -P (k-1)) is calculated (S6).

Based on the value of the pressure change ΔP, a process to be described later
B, the valve opening coefficient k of the control valve 21 _fIs calculated (S
7). The opening degree of the control valve 21 is Op = dum open^*
k_f(S8), and the result of this calculation is used as the control valve 21
To control the valve opening of the control valve 21.
(S9).

FIG. 5 is a PAD showing the calculation procedure of the processing A for obtaining the membership function with respect to the filling time. In the process A, as shown in FIGS. 6A and 6B, the degree of belonging to each value is calculated by calculating the area ratio between the area (ab2) of the triangle and the hatched portion.

For example, if the time T is equal to the membership function NB
If less than (T <NB), the square of T / NB is N
B multiplied by the value 0.35 to be taken at the time of B (S1
1). Similarly, the time T is equal to the membership functions NB and NS
(NB ≦ T <NS), the degree of belonging to each of the times T is calculated by the area ratio, and is multiplied by the values 0.35 and 0.1 to be taken by NB and NS, and is temporarily added. Opening degree dum of the control valve 21 Open is calculated (S1
2).

Similarly, the time T is equal to the membership function NS
And M_s(NS ≦ T <M_S) In the time
NS, M_sso
By multiplying the values to be taken by 0.1 and 1.0 and adding
Opening degree dum of the control valve 21 Open is calculated (S1
3).

Similarly, the time T is equal to the membership function M_s
And M_B(M_S≦ T <M_B)
M_s, M_BThe value to be taken at 1.0 is set to temporary control valve 21.
Degree dum It is calculated as open (S14). Similarly,
Time T is the membership function M_BAnd P_sPlace between
(M_B≤T <P_s) Indicates the degree belonging to each time T
Is calculated by the area ratio, and M_B, P_sValue to take in 1.0,
By multiplying by 0.5 and adding, the temporary control valve 21 is opened.
Degree dum Open is calculated (S15).

Similarly, the time T is equal to the membership function P _s
And P _s ′ (P _s ≦ T <P _s ′),
The degree belonging to each time T is calculated by the area ratio, and P _s , P
multiply the value 0.5 to be taken by _s ' by multiplying the valve opening degree dum Open is calculated (S16).

Similarly, if the time T is greater than or equal to the membership function P _s ′ (P _s ′ <T), the degree belonging to the time T is calculated by the area ratio, and the value 0 to be taken by the P _s ′ is temporarily determined. Opening degree dum of the control valve 21 It is calculated as open (S17). Figure 7 shows a procedure for determining the valve opening coefficient k _f of the processing B from the membership functions according to the pressure change PA
D.

For example, when the pressure change ΔP is smaller than the membership function NB (ΔP <NB), the valve opening degree coefficient k
_{f is set} to 1.4 (S21). Next, when the pressure change ΔP is between the membership functions NB and NS (NB ≦ Δ
For P <NS), the ratio belonging to each is determined by the area ratio.
The values of this area ratio are set to values 1.4, 1..
By adding by multiplying the 2 to calculate the coefficients k _f corresponding to the magnitude of the pressure change ΔP (S22).

Similarly, when the pressure change ΔP is between the membership functions NS and M (NS ≦ ΔP <M),
The ratio belonging to each is determined by the area ratio. The value of this area ratio NS, calculates the coefficient k _f corresponding to the magnitude of the pressure change ΔP by adding by multiplying the value 1.2,1.0 corresponding to M (S23).

Similarly, when the pressure change ΔP is between the membership functions M and PS (M ≦ ΔP <PS),
The ratio belonging to each is determined by the area ratio. The value of this area ratio M, calculates the coefficient k _f corresponding to the magnitude of the pressure change ΔP by adding by multiplying the value 1.0,0.8 corresponding to PS (S24).

Similarly, when the pressure change ΔP is between the membership functions PS and PB (PS ≦ ΔP <PB), the ratio belonging to each of them is determined by the area ratio. The value of this area ratio is multiplied by the values 0.8 and 0.6 corresponding to PS and PB, and added to obtain a coefficient k _f according to the magnitude of the pressure change ΔP.
Is calculated (S25).

[0053] Similarly, the pressure change [Delta] P is the case with more membership functions PB (ΔP ≧ PB), calculates the corresponding value 0.6 as the coefficient k _f corresponding to the magnitude of the pressure change [Delta] P (S26) . Thus, for performing fuzzy control by calculating a membership function corresponding to the pressure change ΔP or time T, calculates a valve opening degree coefficient k _f of the control valve 21 from the membership function, arithmetic expression is simplified As a result, the calculation time is greatly reduced, and processing can be performed at a speed higher than the calculation speed of the ordinary computer control.
It is possible to reduce the time required from the input of the signal detected by 0 and the signal detected by the pressure transmitter 21 to the output of the control amount of the control valve 21 to eliminate the control delay.

[0054] Figure 8 calculates the membership functions corresponding to the pressure change ΔP or time T as described above, was subjected to fuzzy control by calculating the valve opening degree coefficient k _f of the control valve 21 from the membership function It is an experimental result in the case. From the experimental results, when the valve opening of the control valve 21 is calculated by fuzzy control as described above, the non-linearity of the control target is compensated, so that the pressure can be kept constant by the valve opening of the control valve 21. become. As a result, the change in the secondary pressure is reduced, and the fuel tank 3 can be filled with the pressure and the flow rate stabilized.

For this reason, the control opening of the control valve 21 is controlled so that the control delay of the control valve 21 for compensating for the response delay after the measured values of the pressure and the flow rate are input and the pressure and the flow rate are stabilized. Therefore, it is possible to prevent the pressure and the flow rate charged in the fuel tank 3 from rising while fluctuating with a certain amplitude. Therefore, the pressure measurement value instantaneously exceeds the target pressure even though the filling is not completed, and it is determined that the tank pressure on the filling side has reached the target pressure and the control valve is closed. Can be prevented.

For the above-mentioned reason, the gas-filled hose 23
Pressure fluctuation on the gas filling hose 2
3 can be extended. Further, since a change in pressure applied to each connection portion such as the gas filling hose 23, the three-way valve 24, and the connection coupler 26 can be suppressed to be small,
The life of each connection part can be extended.

In the above-described embodiment, the case where compressed natural gas (CNG) obtained by compressing city gas is supplied as an example. However, the present invention is not limited to this, and it is also possible to supply gas such as butane and propane. Of course, it can be applied. Also,
In the above embodiment, the case where the compressed gas is filled in the fuel tank 3 of the vehicle has been described as an example. However, the present invention is not limited to this, and the present invention can also be applied to a device that supplies the compressed gas to other containers or It is needless to say that the present invention can be applied to an apparatus having a configuration in which the compressed gas is simply provided in the middle of a pipe for feeding the compressed gas to another place.

[0058]

As described above, according to the present invention, a membership function corresponding to the secondary pressure change detected by the pressure detecting means and the charging time is created, and the valve opening of the control valve is determined by the membership. Since the calculation is performed based on the function, it is possible to compensate for the non-linearity. Therefore, the appropriate valve opening of the control valve can be calculated even for a model and another solid, so that the valve opening of the control valve can be controlled so that the pressure and the flow rate are stabilized.

That is, it is possible to prevent the pressure and the flow rate of the tank to be filled from increasing while fluctuating with a certain amplitude, and the measured pressure value instantaneously exceeds the target pressure even though the filling is not completed. As a result, it is possible to prevent the control valve from being closed by determining that the tank pressure on the filling side has reached the target pressure.

Further, since the pressure fluctuation on the hose can be reduced, the life of the hose can be prolonged.
A change in pressure applied to each connection portion such as a hose can be suppressed to be small, and the life of each component can be extended.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a gas supply device according to the present invention.

FIG. 2 is a diagram illustrating an example of a membership function of a pressure change ΔP.

FIG. 3 is a diagram showing a membership function with respect to a filling time.

FIG. 4 is a PAD showing a processing procedure of a control process executed by the control device.

FIG. 5 is a PAD showing a calculation procedure of a process A for obtaining a membership function with respect to a filling time.

FIG. 6 is a diagram for explaining a calculation method of a process A for obtaining a membership function with respect to a filling time.

FIG. 7 is a PAD showing a procedure for determining a valve opening degree coefficient k _f in a process B from a membership function based on a pressure change.

[8] calculates the membership functions corresponding to the pressure change ΔP or time T, shows the experimental results in the case of performing fuzzy control by calculating the valve opening degree coefficient k _f of the control valve from the membership function chart It is.

FIG. 9 is a graph showing theoretical values of a valve opening degree of a control valve, a flow rate measurement value, a pressure measurement value, and a pressure of a filling tank when performing gas filling control.

FIG. 10 is a graph showing experimentally obtained flow rate measurement values, pressure measurement values, and pressure changes of the tank to be filled when the valve opening of the control valve is controlled as shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas supply device 3 Fuel tank 4 Pressure generation unit 5 Dispenser unit 12 Compressor 16 Gas accumulator 17 Gas accumulator open / close valve 18 Gas supply line 19 Gas supply on / off valve 20 Mass flow meter 21 Control valve 22 Pressure transmitter 23 Gas filling Hose 24 Three-way valve 26, 36 Connection coupler 30 Coupler switch 31 Fill start button 32 Fill stop button 33 Emergency stop button 34 Control unit 34A Membership function creation unit 34B Control amount calculation unit 35 Display unit

Claims (1)

[Claims] 1. A control valve for controlling a pressure or a flow rate of a tank to be filled, a pressure detecting means for detecting a pressure of a gas supplied from the control valve, and a pressure value detected by the pressure detecting means. A control unit that calculates a valve opening degree of the control valve according to the following. The control unit calculates a membership function according to a secondary pressure change detected by the pressure detection unit and a charging time. A gas filling device which is prepared and calculates a control amount corresponding to a valve opening of the control valve based on the membership function.