Gas fuel compression control system, method, device and equipment and storage medium

Abstract

The invention discloses a gas fuel compression control system, method, device and equipment and a storage medium. The gas fuel compression control system comprises an oil supply control valve, a sensor unit and a controller, and the signal output end of the sensor unit is connected with the signal input end of the controller; the oil supply control valve is used for controlling the on-off of an oil path of the final-stage compression cylinder according to a control instruction output by the controller; the sensor unit is used for collecting working state signals of the compression system in real time. And the controller is used for outputting a corresponding control instruction according to the working state signal so as to control the opening and closing state of the oil supply control valve based on the control instruction, so that the final-stage compression cylinder is put into compression work or quits compression work. The compression efficiency of the gas fuel compression system with the fixed displacement can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of gas fuel compression, and in particular to a gas fuel compression control system, method, device, equipment and storage medium. Background Art

[0002] Gas fuel is a gaseous combustible substance that can generate heat or power. It is a high-quality, efficient and clean fuel. Gas fuel can be directly used as fuel for internal combustion engines. Gas fuels widely used in automobiles include liquid gas fuels (such as LPG (liquefied petroleum gas), LNG (liquefied natural gas), etc.) and gaseous gas fuels (such as hydrogen, CNG (compressed natural gas)).

[0003] At present, in gaseous fuel filling stations such as hydrogen and CNG, it is usually necessary to compress the gas fuel in the gas supply facility (such as a long tube trailer) through a gas fuel compression system and then store it in a gas storage facility.

[0004] like Figure 1 As shown, it is a schematic diagram of the structure of an existing gas fuel compression system, wherein 10 is a first-stage compression cylinder, 20 is a second-stage compression cylinder (currently some gas fuel compression systems also use three-stage or more compression cylinders), 30 is a hydraulic drive unit, and 40 and 50 are respectively the oil injection pipeline and the oil return pipeline of the hydraulic drive unit to the oil side of each stage of compression cylinder.

[0005] The compression cylinders of each stage are in parallel structure on the hydraulic oil circuit, and in series structure on the gas circuit. The exhaust port of the previous stage compression cylinder is connected to the exhaust port of the next stage compression cylinder through a ventilation pipeline. A one-way valve is arranged on the ventilation pipeline, so that the compression cylinders of each stage can directly exhaust the gas storage facility to realize the filling of the gas storage facility.

[0006] The hydraulic drive unit uses an electric motor to drive a booster pump to provide hydraulic oil to each level of compression cylinder. The hydraulic oil displacement provided can be a fixed displacement or a variable displacement.

[0007] When fixed displacement is adopted, the booster pump adopts a fixed-displacement pump, which has low cost and simple maintenance; the motor adopts a fixed-frequency motor, and the star-delta starting or soft starter starting method is adopted in the motor control, which has low cost and simple and stable control.

[0008] When variable displacement is used, one solution is to use a variable displacement pump for the boosting pump, which is more expensive and difficult to maintain, and a fixed frequency motor for the electric motor, and a star-delta starting or soft starter starting method is used for the motor control, which is lower in cost and has simple and stable control; another solution is to use a fixed displacement pump for the boosting pump, which is lower in cost and simpler to maintain, but a variable frequency motor is used for the electric motor, and a frequency converter is used for the motor control, which is more expensive and complex to control.

[0009] Once the compression cylinder is determined, its internal structure, displacement, compression ratio, etc. are also fixed, and its exhaust volume during a single reciprocating compression is also fixed. Therefore, when the hydraulic drive unit adopts a fixed displacement, the compression cylinder switching frequency (the number of reciprocating compressions of the compression cylinder per minute) and the exhaust volume of the compression system are fixed; when the hydraulic drive unit adopts a variable displacement, the switching frequency can be changed by using the booster pump variable or the inverter to change the motor speed to change the amount of hydraulic oil injected into the compression cylinder oil side, thereby changing the switching frequency and then changing the exhaust volume of the compression cylinder. However, if the rated exhaust volume is to be increased, its upward adjustable range is often relatively small.

[0010] In summary, Figure 1 The disadvantages of the existing gas fuel compression system solutions shown are:

[0011] When the hydraulic drive unit adopts a variable displacement solution, the cost is high, maintenance is difficult, and control is complex; when the hydraulic drive unit adopts a fixed displacement solution, although the cost is low, maintenance is simple, and control is simple and stable, the output exhaust volume of the entire compression system is also fixed, which is not conducive to increasing efficiency and reducing consumption.

[0012] In addition, when the hydraulic drive unit adopts a fixed displacement solution, Figure 1 In the existing gas fuel compression system shown in the figure, during the operation of the system, the compression cylinders at each stage work simultaneously to perform multi-stage compression on the gas delivered by the long tube trailer. However, the gas delivery pressure of the gas delivered by the long tube trailer is relatively high during the initial gas delivery stage when the long tube trailer is fully loaded. After being compressed by the first-stage compression cylinder or the first few-stage compression cylinders, it can often reach the charging pressure of the gas storage facility. In this initial gas delivery stage, although the compression cylinder of the last stage is also working under the action of the hydraulic oil pressure, the pressure of the exhaust port of the second-to-last stage compression cylinder can reach the charging pressure of the gas storage facility. After the gas is compressed by the second-to-last stage compression cylinder, it directly charges the gas storage facility through the ventilation pipeline connected to the exhaust port of the last-stage compression cylinder. At this time, the inlet pressure of the final compression cylinder (i.e., the exhaust pressure of the penultimate compression cylinder) is equal to or substantially equal to its exhaust pressure, that is, the final compression cylinder does not actually compress the gas, that is, the final compression cylinder does not do work, but its piston reciprocating motion needs to overcome the friction between the piston and the cylinder body and consumes the energy transmitted by the hydraulic oil, thereby increasing useless energy loss of the hydraulic drive unit and reducing the working efficiency of the compression cylinders before the final compression cylinder, thereby reducing the overall compression efficiency of the compression system.

[0013] Therefore, when the hydraulic drive unit of the gas fuel compression system adopts a low-cost fixed displacement solution, how to improve the compression efficiency of the gas fuel compression system is an urgent problem to be solved in the art. Summary of the invention

[0014] In order to solve the above technical problems, the present application provides a gas fuel compression control system, method, device, equipment and storage medium, which can effectively improve the compression efficiency of a fixed-displacement gas fuel compression system.

[0015] A first object of the present application is to provide a gas fuel compression control system.

[0016] The above-mentioned application objective 1 of the present application is achieved through the following technical solutions:

[0017] A gas fuel compression control system is applied to a gas fuel compression system, wherein the compression system is used to compress the gas fuel outputted from the gas supply facility and store it in the gas storage facility through a multi-stage compression cylinder driven by a fixed displacement hydraulic drive unit, wherein the multi-stage compression cylinder comprises a plurality of compression cylinders connected in series from the first stage to the last stage.

[0018] The compression control system comprises an oil supply control valve, a sensor unit and a controller, wherein the signal output end of the sensor unit is connected to the signal input end of the controller, wherein:

[0019] The oil supply control valve is used to control the on-off of the oil circuit of the final compression cylinder according to the control instruction output by the controller;

[0020] The sensor unit is used to collect the working status signal of the compression system in real time;

[0021] The controller is used to output corresponding control instructions according to the working state signal, so as to control the opening and closing state of the oil supply control valve based on the control instructions, so that the final stage compression cylinder starts compression work or exits compression work.

[0022] Preferably, the working state signal includes the intake pressure P 进 and gas storage facility pressure P 储气 ,

[0023] Wherein, the intake pressure P 进 is the real-time air pressure on the air intake side of the penultimate compression cylinder, and the air storage facility pressure P 储气 The real-time gas pressure of the gas storage facility currently being filled;

[0024] Accordingly,

[0025] The sensor unit includes a sensor for detecting the intake air pressure P 进 The intake pressure sensor and the gas storage facility pressure P 储气 Gas storage pressure sensor,

[0026] The intake pressure sensor is arranged at the intake side of the penultimate compression cylinder, and the signal output end of the intake pressure sensor is connected to the first signal input end of the controller.

[0027] The gas storage pressure sensor is arranged on the gas storage facility, and the signal output end of the gas storage pressure sensor is connected to the second signal input end of the controller.

[0028] Preferably, when the controller executes the control instruction corresponding to the output of the working state signal, it is specifically used to:

[0029] Determine the intake pressure P 进 and gas storage facility pressure P 储气 Whether the preset valve opening conditions are met,

[0030] If the condition is satisfied, a first control instruction is outputted, so as to control the oil supply control valve to open based on the first control instruction, connect the oil circuit of the final compression cylinder, and put the final compression cylinder into compression operation;

[0031] If not, a second control instruction is outputted, so as to control the oil supply control valve to close based on the second control instruction, disconnect the oil circuit of the final compression cylinder, and make the final compression cylinder quit compression operation.

[0032] Preferably, the preset valve opening condition is as follows:

[0033] P 排max ≤P 储气

[0034] Among them, P 排max P represents the maximum exhaust pressure that the exhaust side pressure of the penultimate compression cylinder can reach, and P 排max The following conditions must be met:

[0035] P 排max =(P 油max -P 油损 )×S 油 / S 气 +P 进

[0036] Among them, P 油max Indicates the maximum oil supply pressure of the hydraulic drive unit to the multi-stage compression cylinder, P 油损 It indicates the hydraulic oil pressure loss pressure caused by the friction between the pistons and the inner wall of the cylinder barrel of all the compression cylinders in the multi-stage compression cylinder and the friction loss caused by the deadweight of the compression cylinder rod during the reciprocating motion of the compression cylinder. S 油 The surface area of ​​the piston oil side working surface of the second-to-last compression cylinder, S 气 Represents the surface area of ​​the working surface on the gas side of the piston of the penultimate compression cylinder.

[0037] Preferably, the oil supply control valve is a manual valve or an electric control valve. When the oil supply control valve is an electric control valve, the signal input end of the oil supply control valve is connected to the signal output end of the controller.

[0038] Preferably, the oil supply control valve comprises a first control valve for controlling the on-off of the oil injection port / oil return port of the final compression cylinder and / or a second control valve for controlling the on-off of the oil return port / oil injection port of the final compression cylinder.

[0039] A second object of the present application is to provide a control method for a gas fuel compression control system.

[0040] The second application objective of the present application is achieved through the following technical solutions:

[0041] A control method for a gas fuel compression control system according to any one of the above application purposes, comprising the following steps:

[0042] S1, when the compression system enters a working state, controlling the oil supply control valve to open;

[0043] S2, obtaining a working status signal of the compression system collected in real time by the sensor unit;

[0044] S3, judging whether the preset valve opening condition is currently met according to the working state signal, if so, executing S4, if not, executing S5;

[0045] S4, controlling the oil supply control valve to remain in an open state so that the final stage compression cylinder starts compression operation;

[0046] S5, controlling the oil supply control valve to close so that the final stage compression cylinder exits the compression operation.

[0047] The third object of the present application is to provide a control device for a gas fuel compression control system.

[0048] The third application objective of this application is achieved through the following technical solutions:

[0049] A control device for a gas fuel compression control system according to any one of the above application purposes, comprising:

[0050] A first control module, used for controlling the oil supply control valve to open when the compression system enters a working state;

[0051] A signal acquisition module, used to acquire the working status signal of the compression system collected in real time by the sensor unit;

[0052] A judgment module, used for judging whether a preset valve opening condition is currently met according to the working status signal;

[0053] A second control module is used to control the oil supply control valve to remain in an open state when a preset valve opening condition is currently met, so that the final stage compression cylinder starts compression work;

[0054] The third control module is used to control the oil supply control valve to close when the preset valve opening condition is not met at present, so as to make the last stage compression cylinder quit the compression work.

[0055] The fourth objective of the present application is to provide an electronic device.

[0056] The fourth application objective of this application is achieved through the following technical solutions:

[0057] An electronic device, comprising:

[0058] A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the control method of the gas fuel compression control system described in the second objective of the present application are implemented.

[0059] The fifth object of this application is to provide a computer-readable storage medium.

[0060] The fifth application objective of this application is achieved through the following technical solutions:

[0061] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the control method of the gas fuel compression control system described in the second object of the present application.

[0062] In summary, the present application discloses a gas fuel compression control system, method, device, equipment and storage medium, which controls the on-off of the oil circuit of the final compression cylinder according to the control instruction output by the controller by setting an oil supply control valve, collects the working state signal of the compression system in real time through the sensor unit, and outputs the corresponding control instruction through the controller according to the working state signal collected by the sensor unit, so as to control the opening and closing state of the oil supply control valve based on the control instruction, so that the final compression cylinder is put into compression work or exits compression work, so that when the air pressure in the gas supply facility is low and the compression of each stage of the compression cylinder before the final compression cylinder cannot reach the inflation pressure of the gas storage facility, the final compression cylinder is put into compression work, and when the air pressure in the gas supply facility is high and the inflation pressure of the gas storage facility can be reached by compression of each stage of the compression cylinder before the final compression cylinder, the final compression cylinder is exited from compression work, so that the overall compression efficiency of the compression system is improved, the exhaust volume is increased, the power consumption remains unchanged, and the specific energy consumption is reduced without increasing the hydraulic oil displacement. This reduces the operating cost of the gas station and saves electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0064] Figure 1 It is a structural schematic diagram of an existing gas fuel compression system;

[0065] Figure 2 This is a schematic diagram of the structure of a gas fuel compression control system in one embodiment of the present application;

[0066] Figure 3 This is a flow chart of a control method of a gas fuel compression control system in one embodiment of the present application;

[0067] Figure 4 This is a schematic diagram of the structure of a control device of a gas fuel compression control system in one embodiment of the present application;

[0068] Figure 5 This is a schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0069] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0070] In the embodiments provided in the present application, it should be understood that the disclosed methods and systems can be implemented in other ways. The system embodiments described below are merely schematic. For example, the division of units and modules is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or modules can be combined, or can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0071] In addition, all functional units in the embodiments of the present application may be integrated into one processor, or each unit may be a separate device, or two or more units may be integrated into one device; each functional unit in the embodiments of the present application may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0072] A person skilled in the art can understand that all or part of the steps of the following method embodiments can be completed by program instructions and related hardware. The aforementioned program instructions can be stored in a computer-readable storage medium. When the program instructions are executed, the steps of the following method embodiments are executed; and the aforementioned storage medium includes: a mobile storage device, a read-only memory (ROM), a magnetic disk or an optical disk, and other media that can store program codes.

[0073] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0074] like Figure 2As shown, an embodiment of the present application provides a gas fuel compression control system, which is applied to a gas fuel compression system. The compression system is used to compress the gas fuel output by the gas supply facility 3 and store it in the gas storage facility 4 through a multi-stage compression cylinder 1 driven by a fixed displacement hydraulic drive unit 2. The multi-stage compression cylinder 1 includes a plurality of compression cylinders connected in series from the first stage to the last stage.

[0075] The compression control system may include an oil supply control valve 5, a sensor unit and a controller 7, wherein the signal output end of the sensor unit is connected to the signal input end of the controller 7, wherein:

[0076] The oil supply control valve 5 is used to control the on-off of the oil circuit of the final compression cylinder 12 according to the control instruction output by the controller 7;

[0077] A sensor unit, which is used to collect working status signals of the compression system in real time;

[0078] The controller 7 is used to output corresponding control instructions according to the working state signal, so as to control the opening and closing state of the oil supply control valve 5 based on the control instructions, so that the final stage compression cylinder 12 starts compression work or quits compression work.

[0079] In this embodiment, the gas supply facility 4 is a long tube trailer, and the multi-stage compression cylinder adopts a two-stage compression cylinder.

[0080] The working principle of the gas fuel compression control system of this embodiment is as follows:

[0081] During the working process of the compression system compressing the gas output by the long tube trailer, the sensor unit collects the working state signal of the compression system in real time and sends it to the controller 7. The controller 7 outputs the corresponding control instruction according to the working state signal collected by the sensor unit, so as to control the opening and closing state of the oil supply control valve 5 based on the control instruction, so that the final compression cylinder 12 starts the compression work or exits the compression work. Therefore, when the air pressure in the long tube trailer is low and the inflation pressure of the gas storage facility 4 cannot be reached by the compression of the various compression cylinders before the final compression cylinder 12, the final compression cylinder 12 is put into the compression work; and when the air pressure in the long tube trailer is high and the inflation pressure of the gas storage facility 4 can be reached by the compression of the various compression cylinders before the final compression cylinder 12, the final compression cylinder 12 exits the compression work.

[0082] When the controller 7 determines that the final compression cylinder 12 is not required to be put into compression work according to the working state signal collected by the sensor unit, the hydraulic drive unit 2 does not do work when injecting oil into the final compression cylinder 12, that is, the oil injected by the hydraulic drive unit 2 into the final compression cylinder 12 is useless. At this time, the oil supply control valve 5 is closed, so that the oil injected by the hydraulic drive unit 2 into the final compression cylinder 12 is injected into the compression cylinders of each stage before the final compression cylinder 12. When the volume of the oil side of each compression cylinder is fixed, since the hydraulic oil displacement per unit time of the hydraulic drive system is constant, increasing the oil injection amount per unit time on the compression cylinder oil side is bound to increase its switching frequency, thereby increasing the overall exhaust volume of the compressor; it can also be known that the hydraulic drive unit 2 is equivalent to the existing fixed-displacement hydraulic drive scheme. No change has been made, so the power consumption of the hydraulic drive unit 2 per unit time must be the same as before. However, since the overall exhaust volume of the compression system per unit time increases, the power consumption remains unchanged, and the specific energy consumption is bound to decrease, thereby reducing the operating cost of the gas station.

[0083] The gas fuel compression control system of the present embodiment controls the on-off of the oil circuit of the final compression cylinder 12 according to the control instruction output by the controller 7 by setting an oil supply control valve 5, collects the working state signal of the compression system in real time through the sensor unit, and outputs the corresponding control instruction through the controller 7 according to the working state signal collected by the sensor unit, so as to control the opening and closing state of the oil supply control valve 5 based on the control instruction, so that the final compression cylinder 12 is put into compression work or exits compression work, so that when the air pressure in the long tube trailer is high and the inflation pressure of the gas storage facility 4 can be reached by compression of each stage of compression cylinders before the final compression cylinder 12, the final compression cylinder 12 is exited from compression work. Compared with the prior art in which the multi-stage compression cylinder 1 is put into compression work at any time at the same time, the gas fuel compression control system of the embodiment of the present application improves the overall compression efficiency of the compression system, increases the exhaust volume, keeps the power consumption unchanged, and reduces the specific energy consumption, thereby reducing the operating cost of the gas station and saving electric energy.

[0084] It should be noted that the specific energy consumption refers to the amount of electricity required to pressurize one kilogram of gas to a target pressure.

[0085] Specifically, the fixed displacement hydraulic drive unit 2 in this embodiment includes an electric motor 21, a booster pump 22, a hydraulic oil tank 23 and a hydraulic reversing valve 24. The electric motor 21 is connected to the booster pump 22 by driving, the oil outlet of the booster pump 22 is connected to the oil inlet of the hydraulic reversing valve 24 through an oil injection pipeline 25, the hydraulic oil tank 23 is connected to the oil return port of the hydraulic reversing valve 24 through an oil return pipeline 26, and the two control oil ports of the hydraulic reversing are connected to the two oil ports of each level of the multi-stage compression cylinder 1 through oil pipes. The electric motor 21 adopts a fixed frequency motor, and the booster pump 22 adopts a quantitative oil pump.

[0086] Based on the above embodiment, in one embodiment, the working state signal includes the intake pressure P 进 and gas storage facility 4 pressure P 储气 ,

[0087] Among them, the intake pressure P 进 is the real-time air pressure on the air intake side of the penultimate compression cylinder (i.e., the first compression cylinder 11), and the pressure P of the air storage facility 4 储气 The real-time air pressure of the gas storage facility 4 currently being inflated;

[0088] Accordingly,

[0089] The sensor unit includes a sensor for detecting the intake air pressure P 进 The intake pressure sensor 61 and the pressure sensor for detecting the gas storage facility 4 P 储气 The gas storage pressure sensor 62,

[0090] The intake pressure sensor 61 is arranged at the intake side of the penultimate compression cylinder, and the signal output end of the intake pressure sensor 61 is connected to the first signal input end of the controller 7.

[0091] The gas storage pressure sensor 62 is disposed on the gas storage facility 4 , and a signal output end of the gas storage pressure sensor 62 is connected to a second signal input end of the controller 7 .

[0092] In this embodiment, an intake pressure sensor 61 is provided on the intake side of the penultimate compression cylinder to detect the real-time intake pressure P of the penultimate compression cylinder in real time. 进 The real-time air pressure P of the currently charged air storage facility 4 is detected by setting a gas storage pressure sensor 62 on the gas storage facility 4. 储气 , so that the controller 7 can control the opening and closing of the oil supply control valve 5 according to the real-time air pressure on the air intake side of the penultimate compression cylinder and the real-time air pressure of the gas storage facility 4, and can more accurately calculate the control timing of the final compression cylinder 12 to start compression work and exit compression work, so as to better improve the compression efficiency of the compression system while reducing the operating cost of the gas station.

[0093] Based on the previous embodiment, in one embodiment, when the controller 7 executes the control instruction corresponding to the output of the working state signal, it is specifically used to:

[0094] Determine the intake pressure P 进 and gas storage facility 4 pressure P 储气 Whether the preset valve opening conditions are met,

[0095] If the conditions are met, the first control instruction is outputted, so as to control the oil supply control valve 5 to open based on the first control instruction, connect the oil circuit of the final compression cylinder 12, and put the final compression cylinder 12 into compression operation;

[0096] If not, the second control instruction is outputted, so as to control the oil supply control valve 5 to close based on the second control instruction, disconnect the oil circuit of the final compression cylinder 12, and make the final compression cylinder 12 quit the compression work.

[0097] In this embodiment, the controller 7 is based on the real-time air pressure P at the intake side of the penultimate compression cylinder. 进 , the real-time gas pressure P of the gas storage facility 4 储气 and the preset valve opening condition to determine whether the final-stage compression cylinder 12 needs to be put into compression work. When the preset valve opening condition is met, the controller 7 outputs a first control instruction to control the oil supply control valve 5 to open based on the first control instruction, connect the oil circuit of the final-stage compression cylinder 12, and put the final-stage compression cylinder 12 into compression work; when the preset valve opening condition is not met, the second control instruction is output to control the oil supply control valve 5 to close based on the second control instruction, disconnect the oil circuit of the final-stage compression cylinder 12, and make the final-stage compression cylinder 12 exit the compression work, thereby achieving more accurate calculation of the control timing of the final-stage compression cylinder 12 entering and exiting the compression work, and better improving the compression efficiency of the compression system while reducing the operating cost of the gas station.

[0098] Based on the previous embodiment, in one embodiment, the preset valve opening conditions are as follows:

[0099] P 排max ≤P 储气

[0100] Among them, P 排max P represents the maximum exhaust pressure that the exhaust side pressure of the penultimate compression cylinder can reach, and P 排max The following conditions must be met:

[0101] P 排max =(P 油max -P 油损 )×S 油 / S 气 +P 进

[0102] Among them, P 油max Indicates the maximum oil supply pressure of the hydraulic drive unit 2 to the multi-stage compression cylinder 1, P 油损 It represents the hydraulic oil pressure loss pressure caused by the friction between the pistons and the inner wall of the cylinder barrel of all the compression cylinders in the multi-stage compression cylinder 1 and the friction loss caused by the deadweight of the compression cylinder rod during the reciprocating motion of the compression cylinder, S 油 The surface area of ​​the piston oil side working surface of the second-to-last compression cylinder, S 气 Represents the surface area of ​​the working surface on the gas side of the piston of the penultimate compression cylinder.

[0103] The maximum exhaust pressure P that the exhaust side air pressure of the penultimate compression cylinder in this embodiment can reach is排max Taking into account the various factors that affect the maximum exhaust pressure that the exhaust pressure of the corresponding penultimate compression cylinder can reach, the maximum exhaust pressure P that the exhaust pressure of the penultimate compression cylinder can reach can be calculated more accurately. 排max , and according to whether the current compression system satisfies P 排max ≤P 储气 To determine whether to put the final compression cylinder 12 into compression work, the timing of putting the final compression cylinder 12 into compression work can be determined more accurately, thereby better improving the compression efficiency of the compression system and reducing specific energy consumption.

[0104] It should be noted that P 油损 It is a calculable constant, which is determined according to the specific number of stages of the multi-stage compression cylinder 1 and the specifications of the compression cylinder and other related parameters. For the two-stage compression system commonly used in gas stations, the oil loss of P is about 1MPa. In the two-stage compression system of this embodiment, the oil loss of P is 1MPa. 油 With S 气 The ratio is determined according to the specific model of the compression cylinder.

[0105] Based on the previous embodiment, in one embodiment, the oil supply control valve 5 is a manual valve or an electrically controlled valve. When the oil supply control valve 5 is an electrically controlled valve, the signal input end of the oil supply control valve 5 is connected to the signal output end of the controller 7.

[0106] The oil supply control valve 5 can be a manual valve or an electric control valve. Figure 1 As shown, when the oil supply control valve 5 is an electric control valve, the signal input end of the oil supply control valve 5 is connected to the signal output end of the controller 7, and the controller 7 outputs corresponding control instructions to automatically control the opening and closing state of the oil supply control valve 5, so that the final stage compression cylinder 12 is put into compression or quits compression. When the oil supply control valve 5 is a manual valve, the controller 7 outputs corresponding control instructions to prompt the user to manually open and close the oil supply control valve 5, so that the final stage compression cylinder 12 is put into compression or quits compression.

[0107] Based on the previous embodiment, in one embodiment, the oil supply control valve 5 includes a first control valve 51 for controlling the on-off of the oil injection port / oil return port of the final stage compression cylinder 12 and / or a second control valve 52 for controlling the on-off of the oil return port / oil injection port of the final stage compression cylinder 12.

[0108] Since there are two oil ports on the oil side of the final-stage compression cylinder 12, and the oil filling / oil return states of the two oil ports are constantly switched to control the reversing compression of the compression cylinder, when the first oil port is the oil filling port, the second oil port is the oil return port, and when the first oil port is the oil return port, the second oil port is the oil filling port. Therefore, as long as one of the oil ports is closed by the oil supply control valve 5, the oil circuit of the final-stage compression cylinder 12 is cut off. Therefore, the oil supply control valve 5 can be installed at any oil port of the final-stage compression cylinder 12.

[0109] When there is only one oil port to install the oil supply control valve 5, and when the oil supply control valve 5 is closed, the oil port where the oil supply control valve 5 is installed is the oil return port, a small amount of oil will enter the final compression cylinder 12 under the action of the hydraulic oil pressure. Therefore, in order to ensure a better cutting effect, the oil supply control valve 5 in this embodiment preferably adopts two control valves, that is, the first control valve 51 and the second control valve 52 to control the on and off of the two oil ports of the final compression cylinder 12 respectively.

[0110] like Figure 3 As shown, the embodiment of the present application also provides a control method of the gas fuel compression control system described in any of the above embodiments, and the control method may include the following steps:

[0111] S1, when the compression system enters the working state, the oil supply control valve is controlled to open;

[0112] When the compression system is just started and enters the working state, it is impossible to collect the relatively stable working state signal of the compression system. Therefore, in order to ensure that the compression system can normally inflate the gas storage facility, the oil supply control valve is first controlled to open when the compression system is started, so that the last stage compression cylinder is put into compression work;

[0113] S2, obtaining a working status signal of the compression system collected in real time by the sensor unit;

[0114] After the compression system is operating normally, the working state signal of the compression system collected in real time by the sensor unit is obtained. The compression system can be judged to be normal by setting a time threshold slightly longer than the time required for the compression system to start to operate normally. When the compression system startup start timing exceeds the time threshold, the working state signal of the compression system collected in real time by the sensor unit is obtained.

[0115] S3, judging whether the preset valve opening condition is met according to the working status signal, if yes, executing S4, if not, executing S5;

[0116] S4, controlling the oil supply control valve to remain in an open state so that the final stage compression cylinder can start compression work;

[0117] S5, control the oil supply control valve to close so that the last stage compression cylinder stops compression work.

[0118] After obtaining the working status signal of the compression system collected in real time by the sensor unit, it can be determined whether the preset valve opening condition is currently met based on the working status signal. If the condition is met, the oil supply control valve is controlled to remain open so that the last-stage compression cylinder can be put into compression operation. If the condition is not met (that is, the inflation pressure of the gas storage facility can be reached without the last-stage compression cylinder being put into operation), the oil supply control valve is controlled to be closed so that the last-stage compression cylinder can exit compression operation.

[0119] It should be noted that during the operation of the compression system, steps S1 to S5 are executed in a loop, thereby ensuring that the final compression cylinder can be put into or out of compression at any time as required.

[0120] It should be noted that the technical details not mentioned in the control method of the gas fuel compression control system in this embodiment are the same as those of the gas fuel compression control system in the above embodiments. The control method of the gas fuel compression control system in this embodiment has the same working principle and technical effect as the gas fuel compression control system in the above embodiments, which will not be repeated here.

[0121] like Figure 4 As shown, an embodiment of the present application provides a control device for a gas fuel compression control system, which may include:

[0122] The first control module 201 is used to control the oil supply control valve to open when the compression system enters the working state;

[0123] The signal acquisition module 202 is used to acquire the working status signal of the compression system collected in real time by the sensor unit;

[0124] A judgment module 203, used to judge whether a preset valve opening condition is currently met according to the working state signal;

[0125] The second control module 204 is used to control the oil supply control valve to remain in an open state when the preset valve opening condition is currently met, so that the final stage compression cylinder starts to work in compression;

[0126] The third control module 205 is used to control the oil supply control valve to close when the preset valve opening condition is not met, so that the last stage compression cylinder quits the compression operation.

[0127] It should be noted that the technical details not mentioned in the control device of the gas fuel compression control system in this embodiment are the same as those in the gas fuel compression control system in the above embodiments. The control device of the gas fuel compression control system in this embodiment has the same working principle and technical effect as the gas fuel compression control system in the above embodiments, which will not be repeated here.

[0128] like Figure 5As shown, an embodiment of the present application provides an electronic device 3, which includes a memory 301, a processor 302, and a computer program 303 stored in the memory 301 and executable on the processor 302, wherein the memory 301 and the processor 302 communicate with each other via a bus 304, and when the processor 302 executes the computer program 303, the steps of the control method of the gas fuel compression control system of the above-mentioned method embodiment of the present application are implemented.

[0129] Specifically, the electronic device 3 may be an intelligent device with a memory and a processor, such as an industrial computer, a PC, or an intelligent mobile terminal, or a control module with a memory and a processor, such as a PLC controller or an MCU controller, or a computer component with a memory and a processor, such as a CPU or a GPU. In this embodiment, the electronic device 3 may be a PLC controller.

[0130] An embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the control method steps of the gas fuel compression control system of the above-mentioned method embodiment of the present application are implemented.

[0131] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0132] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0133] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, software modules executed by a processor, or a combination of the two. The software modules may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0134] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas fuel compression control system, applied to a gas fuel compression system, wherein the compression system is used to compress the gas fuel outputted from the gas supply facility and store it in a gas storage facility through a multi-stage compression cylinder driven by a fixed displacement hydraulic drive unit, wherein the multi-stage compression cylinder comprises a plurality of compression cylinders connected in series from the first stage to the last stage, characterized in that: The compression control system comprises an oil supply control valve, a sensor unit and a controller, wherein the signal output end of the sensor unit is connected to the signal input end of the controller, wherein: The oil supply control valve is used to control the on-off of the oil circuit of the final compression cylinder according to the control instruction output by the controller; The sensor unit is used to collect the working status signal of the compression system in real time; The controller is used to output corresponding control instructions according to the working state signal, so as to control the opening and closing state of the oil supply control valve based on the control instructions, so that the final stage compression cylinder starts compression work or exits compression work.

2. The gas fuel compression control system according to claim 1, characterized in that: The working state signal includes the intake pressure P 进 and gas storage facility pressure P 储气 , Wherein, the intake pressure P 进 is the real-time air pressure on the air intake side of the penultimate compression cylinder, and the air storage facility pressure P 储气 The real-time gas pressure of the gas storage facility currently being filled; Accordingly, The sensor unit includes a sensor for detecting the intake air pressure P 进 The intake pressure sensor and the gas storage facility pressure P 储气 Gas storage pressure sensor, The intake pressure sensor is arranged at the intake side of the penultimate compression cylinder, and the signal output end of the intake pressure sensor is connected to the first signal input end of the controller. The gas storage pressure sensor is arranged on the gas storage facility, and the signal output end of the gas storage pressure sensor is connected to the second signal input end of the controller.

3. The gas fuel compression control system according to claim 2, characterized in that: When the controller executes the control instruction corresponding to the output of the working state signal, it is specifically used to: Determine the intake pressure P 进 and gas storage facility pressure P 储气 Whether the preset valve opening conditions are met, If the condition is satisfied, a first control instruction is outputted, so as to control the oil supply control valve to open based on the first control instruction, connect the oil circuit of the final compression cylinder, and put the final compression cylinder into compression operation; If not, a second control instruction is outputted, so as to control the oil supply control valve to close based on the second control instruction, disconnect the oil circuit of the final compression cylinder, and make the final compression cylinder quit compression operation.

4. The gas fuel compression control system according to claim 3, characterized in that: The preset valve opening conditions are as follows: P 排max ≤P 储气 Among them, P 排max P represents the maximum exhaust pressure that the exhaust side pressure of the penultimate compression cylinder can reach, and P 排max The following conditions must be met: P 排max =(P 油max -P 油损 )×S 油 / S 气 +P 进 Among them, P 油max Indicates the maximum oil supply pressure of the hydraulic drive unit to the multi-stage compression cylinder, P 油损 It indicates the hydraulic oil pressure loss pressure caused by the friction between the pistons and the inner wall of the cylinder barrel of all the compression cylinders in the multi-stage compression cylinder and the friction loss caused by the deadweight of the compression cylinder rod during the reciprocating motion of the compression cylinder. S 油 The surface area of ​​the piston oil side working surface of the second-to-last compression cylinder, S 气 Represents the surface area of ​​the working surface on the gas side of the piston of the penultimate compression cylinder.

5. The gas fuel compression control system according to any one of claims 1 to 4, characterized in that: The oil supply control valve is a manual valve or an electric control valve. When the oil supply control valve is an electric control valve, the signal input end of the oil supply control valve is connected to the signal output end of the controller.

6. The gas fuel compression control system according to claim 5, characterized in that: The oil supply control valve comprises a first control valve for controlling the on-off of the oil injection port / oil return port of the final compression cylinder and / or a second control valve for controlling the on-off of the oil return port / oil injection port of the final compression cylinder.

7. A control method for a gas fuel compression control system according to any one of claims 1 to 6, characterized in that: The steps include: S1, when the compression system enters a working state, controlling the oil supply control valve to open; S2, obtaining a working status signal of the compression system collected in real time by the sensor unit; S3, judging whether the preset valve opening condition is currently met according to the working state signal, if so, executing S4, if not, executing S5; S4, controlling the oil supply control valve to remain in an open state so that the final stage compression cylinder starts compression operation; S5, controlling the oil supply control valve to close so that the final stage compression cylinder exits the compression operation.

8. The control device of the gas fuel compression control system according to any one of claims 1 to 6, characterized in that: include: A first control module, used for controlling the oil supply control valve to open when the compression system enters a working state; A signal acquisition module, used to acquire the working status signal of the compression system collected in real time by the sensor unit; A judgment module, used for judging whether a preset valve opening condition is currently met according to the working status signal; A second control module is used to control the oil supply control valve to remain in an open state when a preset valve opening condition is currently met, so that the final stage compression cylinder starts compression work; The third control module is used to control the oil supply control valve to close when the preset valve opening condition is not met at present, so as to make the last stage compression cylinder quit the compression work.

9. An electronic device, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the control method according to claim 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the control method according to claim 7 are implemented.

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