Decompression system and decompression method

Abstract

The present invention provides a decompression system and a decompression method. The decompression system (10) determines the adjustment amount of a flow control valve (14) provided on a discharge flow path (22) based on the pressure detected by a pressure sensor (18) provided on the discharge flow path (22), corrects the determined adjustment amount based on the temperature detected by a temperature sensor (16) provided on the discharge flow path (22), and controls the flow control valve (14) in a manner to obtain the corrected adjustment amount. The discharge flow path (22) is a flow path through which compressed gas flowing out of a gas generating device (12) flows. In this way, the flow rate can be appropriately adjusted.

Description

Technical Field

[0001] The present invention relates to a decompression system and a decompression method for decompressing compressed gas generated by a gas generating device for generating compressed gas. Background Art

[0002] Gas generating devices include hydrogen compression devices, oxygen compression devices, and hydrogen pressure boosting devices. Hydrogen compression devices electrolyze water and compress the generated hydrogen. Oxygen compression devices electrolyze water and compress the generated oxygen. Hydrogen pressure boosting devices electrolyze hydrogen to generate high-pressure hydrogen.

[0003] In a gas generator, the pressure differential across the electrolyte membrane must be eliminated when shutting down. Specifically, a flow control valve connected to the gas generator's discharge flow path is controlled to reduce the pressure of the compressed gas in the discharge flow path. This eliminates the pressure differential across the electrolyte membrane.

[0004] Japanese Patent Application Laid-Open No. 2011-134164 discloses a method for controlling the opening of a valve. This method measures a pressure drop curve within a valve chamber and modifies the pressure drop curve so that the measured pressure drop curve approximates a target pressure drop gradient. The method then controls the valve opening based on the modified pressure drop curve. Summary of the Invention

[0005] Furthermore, the temperature of the compressed gas generated by the gas generator is susceptible to changes due to heat generated by the gas generator or the external temperature. When the temperature of the compressed gas generated by the gas generator changes, the volume, pressure, viscosity, and other properties of the compressed gas change. To change the pressure at a target pressure change rate, the flow control valve adjustment amount must be adjusted in accordance with temperature changes.

[0006] Therefore, even if the control method of Japanese Patent Application Laid-Open No. 2011-134164 is applied to the gas generating device, there is a possibility that the flow rate of the compressed gas cannot be appropriately adjusted.

[0007] The purpose of the present invention is to solve the above-mentioned technical problems.

[0008] One embodiment of the present invention is a decompression system, which decompresses the compressed gas generated by a gas generating device that generates compressed gas, and has a flow regulating valve, a temperature sensor, a pressure sensor and a control device, wherein the flow regulating valve is arranged on a discharge flow path through which the compressed gas flowing out of the gas generating device flows, and is used to regulate the flow rate of the compressed gas; the temperature sensor is arranged on the discharge flow path, and is used to detect the temperature of the compressed gas; the pressure sensor is arranged on the discharge flow path, and is used to detect the pressure of the compressed gas; the control device is used to control the flow regulating valve, and the control device determines the adjustment amount of the flow regulating valve according to the pressure detected by the pressure sensor, and corrects the determined adjustment amount according to the temperature detected by the temperature sensor.

[0009] Another embodiment of the present invention is a decompression method, which decompresses compressed gas generated by a gas generating device that generates compressed gas, determines an adjustment amount of a flow control valve provided on the discharge flow path based on a pressure detected by a pressure sensor provided on the discharge flow path, wherein the discharge flow path is a flow path through which the compressed gas flowing out of the gas generating device flows; corrects the determined adjustment amount based on a temperature detected by a temperature sensor provided on the discharge flow path; and controls the flow control valve in a manner that becomes the corrected adjustment amount.

[0010] The above-described decompression system and decompression method can appropriately adjust the flow rate of the flow rate control valve compared to a case where the adjustment amount of the flow rate control valve determined according to the pressure of the compressed gas is not corrected according to the temperature of the compressed gas.

[0011] The above-mentioned objects, features and advantages will be easily understood from the following description of the embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram showing a decompression system according to an embodiment.

[0013] Figure 2 This is a block diagram showing the structure of the control device.

[0014] Figure 3 This is a graph showing the relationship between temperature, number of decompression cycles, and adjustment amount.

[0015] Figure 4 This is a flowchart showing the steps of the control process of the control device.

[0016] Figure 5 Schematic diagram showing a pressure reduction system according to a modified example. DETAILED DESCRIPTION

[0017] Figure 1 Schematic diagram showing a decompression system 10 according to an embodiment. The decompression system 10 is a system for decompressing compressed gas generated by a gas generator 12. The decompression system 10 includes a flow rate regulating valve 14, a temperature sensor 16, a pressure sensor 18, and a control device 20.

[0018] The gas generating device 12 may be a hydrogen pressure increasing device, a hydrogen compression device, or an oxygen compression device. The gas generating device 12 includes an electrochemical cell 12A.

[0019] The electrochemical cell 12A includes an electrolyte membrane, an anode electrode laminated on one surface of the electrolyte membrane, and a cathode electrode laminated on the other surface of the electrolyte membrane. A voltage is applied between the anode electrode and the cathode electrode.

[0020] When the gas generator 12 is a hydrogen gas pressure booster, hydrogen gas is supplied to the anode electrode of the electrochemical cell 12A. When a voltage is applied between the anode electrode and the cathode electrode, the hydrogen gas supplied to the anode electrode is electrolyzed to generate protons (H + ions). The electrochemical cell 12A transports protons from the anode electrode to the cathode electrode through the electrolyte membrane, and uses the transported protons to generate compressed gas (compressed gas).

[0021] When the gas generator 12 is a hydrogen compression device, water is supplied to the anode electrode of the electrochemical cell 12A. When a voltage is applied between the anode electrode and the cathode electrode, the water supplied to the anode electrode is electrolyzed to generate protons (H + The electrochemical cell 12A transports protons from the anode electrode to the cathode electrode through the electrolyte membrane, and uses the transported protons to generate compressed gas.

[0022] When the gas generator 12 is an oxygen gas compressor, water is supplied to the cathode electrode of the electrochemical cell 12A. When a voltage is applied between the anode electrode and the cathode electrode, the water supplied to the cathode electrode is electrolyzed to generate OH. - The electrochemical cell 12A transports OH from the cathode electrode through the electrolyte membrane to the anode electrode. - , using the delivered OH - Generates compressed gas (high-pressure oxygen).

[0023] A discharge flow path 22 is connected to the discharge port 12B of the gas generator 12. Compressed gas flowing out of the gas generator 12 flows into the discharge flow path 22. The discharge flow path 22 may also be a pipe. The discharge flow path 22 includes a first discharge flow path 22A and a second discharge flow path 22B. The second discharge flow path 22B branches off from a branch point P1 of the first discharge flow path 22A. Compressed gas flowing through the first discharge flow path 22A flows into the accumulator. Compressed gas flowing through the second discharge flow path 22B is discharged.

[0024] A back pressure valve 24 is provided in the first discharge flow path 22A downstream of the branch point P1. An on-off valve 26 is provided in the second discharge flow path 22B. A flow rate regulating valve 14 is provided in the second discharge flow path 22B downstream of the on-off valve 26.

[0025] The flow control valve 14 regulates the flow rate of compressed gas. It is a variable-opening type control valve. Alternatively, the flow control valve 14 may be an on-off type control valve with a variable ratio of the valve open period to the valve closed period per unit time (duty ratio). The flow control valve 14 changes its opening or duty ratio in accordance with control by the control device 20.

[0026] The temperature sensor 16 is a sensor for detecting the temperature of the compressed gas. The temperature sensor 16 is provided on the discharge flow path 22 upstream of the flow control valve 14. Figure 1 In the embodiment, a temperature sensor 16 is provided on the discharge flow path 22 between the gas generating device 12 and the on-off valve 26 .

[0027] The pressure sensor 18 is a sensor for detecting the pressure of the compressed gas. The pressure sensor 18 is provided on the discharge flow path 22 upstream of the flow control valve 14. Figure 1 In the embodiment, a pressure sensor 18 is provided on the discharge flow path 22 between the gas generating device 12 and the on-off valve 26 .

[0028] The control device 20 is a device for controlling the on-off valve 26 and the flow control valve 14. The control device 20 closes the on-off valve 26 without reducing the pressure of the compressed gas. In this case, the control device 20 does not control the flow control valve 14. In addition, when the on-off valve 26 is closed, the pressure of the compressed gas upstream of the back pressure valve 24 is regulated to a constant level by the back pressure valve 24. On the other hand, the control device 20 opens the on-off valve 26 while reducing the pressure of the compressed gas. In this case, the control device 20 reduces the pressure of the compressed gas upstream of the flow control valve 14 by controlling the flow control valve 14.

[0029] Figure 2This is a block diagram showing the configuration of the control device 20. The control device 20 includes a calculation unit 30 and a storage unit 32. The calculation unit 30 includes a manipulated variable determination unit 34, a manipulated variable correction unit 36, and a valve control unit 38. The storage unit 32 includes a volatile memory such as RAM and a nonvolatile memory such as ROM.

[0030] At least a portion of the adjustment amount determination unit 34, the adjustment amount correction unit 36, and the valve control unit 38 may be an integrated circuit such as an ASIC. Furthermore, at least a portion of the adjustment amount determination unit 34, the adjustment amount correction unit 36, and the valve control unit 38 may be a functional unit that functions when a processor executes a program stored in the storage unit 32.

[0031] The adjustment amount determination unit 34 determines the adjustment amount of the flow rate control valve 14 based on the pressure detected by the pressure sensor 18. Alternatively, the adjustment amount determination unit 34 may determine the adjustment amount of the flow rate control valve 14 for each unit time.

[0032] If the flow control valve 14 is an opening type control valve, the control amount of the flow control valve 14 is the opening of the flow control valve 14. If the flow control valve 14 is an on-off type control valve, the control amount of the flow control valve 14 is the duty cycle.

[0033] The adjustment amount corrector 36 corrects the adjustment amount determined by the adjustment amount determiner 34 based on the temperature detected by the temperature sensor 16 and the number of decompressions. The number of decompressions is the number of times when the processing unit from the start to the end of control of the flow control valve 14 is considered as one.

[0034] Here, the relationship between temperature, number of decompression times, and adjustment amount is explained. Figure 3 This is a graph showing the relationship between temperature, number of decompression times and adjustment amount. Figure 3 , multiple correlation graphs corresponding to the number of decompression times are shown as examples. Figure 3 The correlation curve on the left side corresponds to the case where the number of decompression times is 1. On the other hand, Figure 3 The correlation graph on the right side corresponds to the case where the number of decompressions is N. “N” is an integer greater than or equal to 2.

[0035] Each correlation graph has correlation lines corresponding to a plurality of temperatures. Figure 3 exemplified in FIG. 5 are a correlation line corresponding to 5 degrees C, a correlation line corresponding to 10 degrees C, and a correlation line corresponding to 15 degrees C. Each correlation line is a line connecting data points indicating the correlation between the pressure and the adjustment amount of the flow rate control valve 14 .

[0036] exist Figure 3The duty cycle is shown as an example of the adjustment amount of the flow control valve 14. A duty cycle of 100% means that there is no valve closed period per unit time. In this case, the flow rate of the flow control valve 14 is maximum. On the other hand, a duty cycle of 0% means that there is no valve open period per unit time. In this case, the flow rate of the flow control valve 14 is zero.

[0037] The pressure and volume of the compressed gas within the container equipped with the back-pressure valve 24 are both constant. Therefore, the higher the temperature of the compressed gas, the less mass the compressed gas within the container. Therefore, if the adjustment amount at a first temperature and the adjustment amount at a second temperature (higher than the first temperature) are the same, the rate of pressure drop increases as the compressed gas temperature rises. Therefore, by correcting the adjustment amount so that the flow rate decreases as the temperature increases, the change in pressure velocity caused by the increase in compressed gas temperature can be suppressed.

[0038] Furthermore, when the flow control valve 14 contacts the valve seat when closed, causing wear on the flow control valve 14 or the seat, the cross-sectional area of ​​the flow increases. Therefore, if the compressed gas temperature remains unchanged, the flow rate through the flow control valve 14 tends to increase as the number of decompression cycles increases. Therefore, by correcting the adjustment amount so that the flow rate decreases with increasing decompression cycles, changes in the flow rate caused by the increase in decompression cycles can be suppressed.

[0039] Therefore, the adjustment amount corrector 36 corrects the adjustment amount determined by the adjustment amount determiner 34 so that the flow rate decreases as the temperature detected by the temperature sensor 16 increases. Furthermore, the adjustment amount corrector 36 corrects the adjustment amount determined by the adjustment amount determiner 34 so that the flow rate decreases as the number of decompression cycles increases.

[0040] The valve control unit 38 controls the on-off valve 26 and the flow rate regulating valve 14. When the on-off valve 26 is closed, the valve control unit 38 does not control the flow rate regulating valve 14. When the on-off valve 26 is open, the valve control unit 38 controls the flow rate regulating valve 14 so that the regulated amount corrected by the regulated amount corrector 36 is obtained.

[0041] When the flow control valve 14 is an opening-type control valve, for example, the valve control unit 38 generates a drive signal for driving the motor of the flow control valve 14 based on the adjustment amount (opening) corrected by the adjustment amount correction unit 36. The valve control unit 38 outputs the generated drive signal to the motor of the flow control valve 14, thereby changing the opening of the flow control valve 14 to the opening corrected by the adjustment amount correction unit 36.

[0042] When the flow control valve 14 is an on / off type control valve, for example, the valve control unit 38 generates a pulse signal for driving the solenoid of the flow control valve 14 based on the adjustment amount (duty ratio) corrected by the adjustment amount correction unit 36. The valve control unit 38 outputs the generated pulse signal to the solenoid of the flow control valve 14 to change the ratio of the valve open period to the valve closed period per unit time (duty ratio).

[0043] Next, a description will be given of a method for reducing the pressure of the compressed gas generated by the gas generator 12. This method is implemented by a control process of the controller 20 that controls the flow rate regulating valve 14. Figure 4 1 is a flowchart showing the procedure of the control process of the control device 20 .

[0044] The control device 20 starts the control process when receiving a pressure reduction command output from the outside, for example. In this case, the valve control unit 38 opens the closed on-off valve 26. When the on-off valve 26 is opened, the control process shifts to step S1.

[0045] In step S1, the calculation unit 30 increments the count value CV of the number of decompression times by "1." When the count value CV of the number of decompression times increases, the control process shifts to step S2.

[0046] In step S2 , the adjustment amount determination unit 34 determines the adjustment amount (initial adjustment amount) of the flow rate control valve 14 based on the pressure (initial pressure) detected by the pressure sensor 18 when control of the flow rate control valve 14 is started.

[0047] In addition, the adjustment amount (initial adjustment amount) can also be determined using a database or a relational expression stored in the storage unit 32. Figure 3 As shown in the illustrated graph, the database contains information indicating the correlation between pressure and adjustment amount. The relational expression is a mathematical formula for deriving the adjustment amount related to pressure.

[0048] When using a database, the adjustment amount determination unit 34 searches for the adjustment amount that is most similar to the initial pressure and determines the retrieved adjustment amount as the initial adjustment amount of the flow control valve 14. When using a relational expression, the adjustment amount determination unit 34 calculates the adjustment amount based on the initial pressure and determines the calculated adjustment amount as the initial adjustment amount of the flow control valve 14. Once the initial adjustment amount of the flow control valve 14 is determined, the control process proceeds to step S3.

[0049] In step S3, the adjustment amount correction unit 36 ​​obtains the temperature (initial temperature) detected by the temperature sensor 16 at the start of control of the flow control valve 14. Furthermore, the adjustment amount correction unit 36 ​​corrects the adjustment amount (initial adjustment amount) determined in step S2. Here, the adjustment amount correction unit 36 ​​corrects the adjustment amount so that the flow rate decreases as the obtained temperature (initial temperature) increases. Furthermore, the adjustment amount correction unit 36 ​​corrects the adjustment amount so that the flow rate decreases as the obtained number of decompression operations (count value CV) increases. Once the adjustment amount (initial adjustment amount) determined in step S3 is corrected, the control process proceeds to step S4.

[0050] Furthermore, the adjustment amount (initial adjustment amount) may be corrected using a correction database or correction equation stored in the storage unit 32. The correction database contains information indicating correction amounts corresponding to various patterns consisting of combinations of various temperatures and various decompression times. The correction equation is a mathematical formula for deriving the correction amount related to temperature.

[0051] In step S4, the valve control unit 38 controls the flow rate regulating valve 14 so as to obtain the adjustment amount (initial adjustment amount) corrected in step S3. When the flow rate regulating valve 14 is controlled, the control process proceeds to step S5.

[0052] In step S5, the adjustment amount determination unit 34 starts measuring the change rate of the pressure per unit time based on the pressure detected by the pressure sensor 18. When the change rate of the pressure is measured, the control process proceeds to step S6.

[0053] In step S6 , the adjustment amount determination unit 34 redetermines the adjustment amount of the flow rate control valve 14 according to the change rate measured in step S5 .

[0054] For example, the adjustment amount determination unit 34 may modify the adjustment amount of the flow control valve 14 determined in step S2 so that the difference between the change rate measured in step S5 and the target change rate decreases, thereby re-determining the adjustment amount of the flow control valve 14. Alternatively, the adjustment amount determination unit 34 may calculate the adjustment amount corresponding to the measured change rate using a relational expression representing the relationship between the change rate and the adjustment amount, and re-determine the calculated adjustment amount as the adjustment amount of the flow control valve 14. Alternatively, the adjustment amount determination unit 34 may use a database representing adjustment amounts corresponding to each of a plurality of change rates to search for the adjustment amount that is most similar to the measured change rate, and re-determine the detected adjustment amount as the adjustment amount of the flow control valve 14. Once the adjustment amount of the flow control valve 14 is determined, the process proceeds to step S7.

[0055] In step S7, the valve control unit 38 controls the flow rate regulating valve 14 so as to achieve the adjustment amount newly determined in step S6. When the flow rate regulating valve 14 is controlled, the control process proceeds to step S8.

[0056] In step S8, the calculation unit 30 determines whether to terminate control of the flow control valve 14. For example, if no external pressure reduction stop command has been issued, the calculation unit 30 determines not to terminate control of the flow control valve 14. In this case, the control process returns to step S5. On the other hand, if a pressure reduction stop command has been issued, the calculation unit 30 determines to terminate control of the flow control valve 14. In this case, the control process ends.

[0057] Thus, the control device 20 corrects the adjustment amount of the flow control valve 14 corresponding to the pressure at the start of control according to the temperature at the start of control and the number of decompressions, and controls the flow control valve 14 to obtain the corrected adjustment amount (S1 to S4).

[0058] After that, the control device 20 performs feedback control until the control of the flow rate regulating valve 14 is completed (S5 to S8). That is, the control device 20 changes the adjustment amount according to the change rate of the pressure per unit time.

[0059] The above-mentioned embodiment may be modified as follows.

[0060] Figure 5 Schematic diagram of a modified decompression system 10. The modified decompression system 10 further includes an external temperature sensor 40. The external temperature sensor 40 detects the external temperature of the gas generator 12. The external temperature sensor 40 is attached to the outer wall surface of the gas generator 12, for example.

[0061] The adjustment amount correction unit 36 ​​of this modification estimates the temperature gradient of the compressed gas based on the temperature detected by the temperature sensor 16 when the control of the flow control valve 14 starts and the external temperature detected by the external temperature sensor 40 when the control of the flow control valve 14 starts. Figure 4 This estimation is performed in step S2 of the control process shown.

[0062] In the present modification, it is preferable that, in step S2 , the adjustment amount correcting unit 36 ​​corrects the adjustment amount determined by the adjustment amount determining unit 34 according to the estimated temperature gradient of the compressed gas.

[0063] Thus, in this modified example, the control device 20 estimates the temperature gradient of the compressed gas based on the temperature of the compressed gas and the external temperature, and corrects the adjustment amount of the flow control valve 14 based on the estimated temperature gradient. Thus, the control device 20 can adjust the flow rate of the flow control valve 14 by taking into account the external temperature in addition to the temperature on the discharge flow path 22.

[0064] In addition, the number of decompression times in the embodiment and the modified example can also be omitted. That is, the control device 20 can also correct the adjustment amount only based on the temperature detected by the temperature sensor 16. In the case where the control device 20 corrects the adjustment amount only based on the temperature, the number of decompression times in the embodiment and the modified example can be omitted. Figure 4 The control process shown is step S1.

[0065] The following first and second inventions are listed as inventions that can be grasped from the above description.

[0066] The first invention is a decompression system (10) for decompressing compressed gas generated by a gas generating device (12) for generating compressed gas. The decompression system (10) comprises a flow regulating valve (14), a temperature sensor (16), a pressure sensor (18), and a control device (20), wherein the flow regulating valve (14) is provided on a discharge flow path (22) through which the compressed gas flowing out of the gas generating device (12) flows, and is used to regulate the flow rate of the compressed gas; the temperature sensor (16) is provided on the discharge flow path (22) and is used to detect the temperature of the compressed gas; the pressure sensor (18) is provided on the discharge flow path (22) and is used to detect the pressure of the compressed gas; and the control device (20) is used to control the flow regulating valve (14). The control device (20) determines the adjustment amount of the flow regulating valve (14) based on the pressure detected by the pressure sensor (18), and corrects the determined adjustment amount based on the temperature detected by the temperature sensor (16).

[0067] Thus, the flow rate of the flow rate regulating valve (14) can be appropriately regulated compared to a case where the decompression system (10) does not correct the regulation amount of the flow rate regulating valve (14) determined according to the pressure of the compressed gas according to the temperature of the compressed gas.

[0068] The control device (20) may also measure the change rate of the pressure per unit time from the start of control of the flow control valve (14), and determine the adjustment amount according to the measured change rate. In this way, the control device (20) can appropriately adjust the flow rate of the flow control valve (14) according to the change rate of the pressure while taking the temperature into consideration.

[0069] The control device (20) can also change the adjustment amount in a manner that the difference between the change speed and the target change speed becomes smaller. Accordingly, the control device (20) can adjust the flow rate of the flow control valve (14) in a manner that follows the target change speed.

[0070] The decompression system (10) may further include an external temperature sensor (40) for detecting the external temperature of the gas generating device (12). The control device (20) estimates the temperature gradient of the compressed gas based on the temperature detected by the temperature sensor (16) at the start of control of the flow control valve (14) and the external temperature detected by the external temperature sensor (40) at the start of control of the flow control valve (14), and corrects the determined adjustment amount based on the estimated temperature gradient. In this way, the control device (20) can adjust the flow rate of the flow control valve (14) in consideration of the external temperature in addition to the temperature on the discharge flow path (22).

[0071] The control device (20) may also correct the determined adjustment amount according to the temperature when the flow control valve (14) is started to be controlled. Thus, the flow of the flow control valve (14) can be appropriately adjusted compared to the case where the adjustment amount is corrected after the control starts.

[0072] The control device (20) can also correct the adjustment amount in such a manner that the flow rate decreases as the temperature increases. Accordingly, the control device (20) can appropriately adjust the flow rate of the flow control valve (14) while taking the temperature into consideration.

[0073] The control device (20) may also correct the determined adjustment amount according to the number of decompression times and the temperature, wherein the number of decompression times refers to the number of times when the processing unit from the start of control of the flow control valve (14) to the end of control is regarded as one time. Thus, compared with the case where the control device (20) corrects the adjustment amount only according to the amount of change in temperature, the correction accuracy can be improved.

[0074] The control device (20) can also correct the adjustment amount in such a way that the flow rate decreases as the number of decompressions increases. Accordingly, the control device (20) can appropriately adjust the flow rate of the flow control valve (14) according to the speed of pressure change while taking the number of decompressions into consideration.

[0075] A second invention is a decompression method for decompressing compressed gas generated by a gas generating device (12) for generating compressed gas. The decompression method determines an adjustment amount of a flow control valve (14) provided on a discharge flow path (22) based on a pressure detected by a pressure sensor (18) provided on the discharge flow path (22), the discharge flow path (22) being a flow path through which the compressed gas flowing out of the gas generating device (12) flows; corrects the determined adjustment amount based on a temperature detected by a temperature sensor (16) provided on the discharge flow path (22); and controls the flow control valve (14) so ​​as to obtain the corrected adjustment amount.

[0076] According to this, the flow rate of the flow rate regulating valve (14) can be appropriately regulated compared to a case where the decompression method does not correct the regulation amount of the flow rate regulating valve (14) determined according to the pressure of the compressed gas according to the temperature of the compressed gas.

[0077] In addition, the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

Claims

1. A decompression system (10) for decompressing compressed gas generated by a gas generating device (12) for generating compressed gas. It is characterized by: The invention comprises a flow regulating valve (14), a temperature sensor (16), a pressure sensor (18), an external temperature sensor (40) and a control device (20), wherein: The flow regulating valve (14) is provided on a discharge flow path (22) through which the compressed gas flowing out of the gas generating device flows, and is used to regulate the flow rate of the compressed gas; The temperature sensor (16) is arranged on the discharge flow path and is used to detect the temperature of the compressed gas; The pressure sensor (18) is arranged on the discharge flow path and is used to detect the pressure of the compressed gas; The external temperature sensor (40) is used to detect the external temperature of the gas generating device. The control device (20) is used to control the flow regulating valve, The control device determines an adjustment amount of the flow control valve according to the pressure detected by the pressure sensor, and corrects the determined adjustment amount according to the temperature detected by the temperature sensor. The control device measures a change rate of the pressure per unit time from the start of control of the flow control valve, and determines the adjustment amount according to the measured change rate. The control device changes the adjustment amount in such a manner that the difference between the change speed and the target change speed becomes smaller, The control device estimates the temperature gradient of the compressed gas based on the temperature detected by the temperature sensor when control of the flow control valve starts and the external temperature detected by the external temperature sensor when control of the flow control valve starts, and corrects the determined adjustment amount based on the estimated temperature gradient.

2. The decompression system according to claim 1, characterized in that The control device corrects the adjustment amount so that the flow rate decreases as the temperature increases.

3. A decompression system (10) for decompressing compressed gas generated by a gas generating device (12) for generating compressed gas, It is characterized by: It has a flow regulating valve (14), a temperature sensor (16), a pressure sensor (18) and a control device (20), wherein: The flow regulating valve (14) is provided on a discharge flow path (22) through which the compressed gas flowing out of the gas generating device flows, and is used to regulate the flow rate of the compressed gas; The temperature sensor (16) is arranged on the discharge flow path and is used to detect the temperature of the compressed gas; The pressure sensor (18) is arranged on the discharge flow path and is used to detect the pressure of the compressed gas; The control device (20) is used to control the flow regulating valve, The control device determines an adjustment amount of the flow control valve according to the pressure detected by the pressure sensor, and corrects the determined adjustment amount according to the temperature detected by the temperature sensor. The control device corrects the determined adjustment amount according to the temperature at the start of control of the flow control valve, The control device corrects the determined adjustment amount according to the number of decompression operations and the temperature, wherein the number of decompression operations is the number of operations when a processing unit from when control of the flow control valve starts to when control ends is regarded as one.

4. The decompression system according to claim 3, characterized in that The control device corrects the adjustment amount so that the flow rate decreases as the number of decompression times increases.

5. A method for reducing pressure on compressed gas generated by a gas generating device for generating compressed gas, characterized in that: determining an adjustment amount of a flow rate regulating valve provided on a discharge flow path according to a pressure detected by a pressure sensor provided on the discharge flow path, wherein the discharge flow path is a flow path through which the compressed gas flowing out of the gas generating device flows; correcting the determined adjustment amount according to a temperature detected by a temperature sensor provided on the discharge flow path; controlling the flow rate regulating valve so as to obtain the corrected regulation amount, measuring a change rate of the pressure per unit time from the start of control of the flow control valve, and determining the adjustment amount according to the measured change rate, The adjustment amount is changed in such a manner that the difference between the change speed and the target change speed becomes smaller, The temperature gradient of the compressed gas is estimated based on the temperature detected by the temperature sensor when the control of the flow control valve starts and the external temperature detected by the external temperature sensor when the control of the flow control valve starts, and the determined adjustment amount is corrected based on the estimated temperature gradient, wherein the external temperature sensor is used to detect the external temperature of the gas generating device.

Images