A control method, system, device, controller and storage medium for a hydrogen refueling station

Abstract

The present application discloses a control method, system, device, controller and storage medium for a hydrogen refueling station, the method comprising: obtaining the temperature and buffer tank pressure at the vaporizer outlet during the operation of the hydrogen refueling station; when the vaporizer outlet temperature is lower than a first preset temperature and the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, adjusting the flow of the hydraulic oil according to the buffer tank pressure so that the buffer tank pressure tends to the ideal pressure value; when the vaporizer outlet temperature is lower than a first preset temperature and the buffer tank pressure is less than or equal to the pressure threshold corresponding to the current temperature, adjusting the flow of the hydraulic oil according to the vaporizer outlet temperature so that the vaporizer temperature tends to the ideal temperature value. This solution can obtain the temperature and buffer tank pressure of the vaporizer outlet in real time and make dynamic adjustments to control the vaporizer temperature and buffer tank pressure to tend to the ideal value, thereby reducing the situation where the pump is stopped due to the vaporizer temperature being too low or the buffer tank pressure being too high, and reducing the frequency of hydrogen station service interruptions.

Description

Technical Field

[0001] The present application relates to the field of industrial control technology, and in particular to a control method, system, device, controller and storage medium for a hydrogen refueling station. Background Art

[0002] When filling high-pressure gaseous hydrogen into user vehicles at a liquid hydrogen storage type hydrogen filling station, the liquid hydrogen needs to be vaporized into high-pressure gaseous hydrogen in a vaporizer and temporarily stored in a buffer tank. When a user vehicle comes to refuel with hydrogen, the user vehicle is filled with high-pressure gaseous hydrogen through a hydrogen filling machine.

[0003] After a hydrogenation station has been running for a period of time, the vaporizer is prone to frost or ice, resulting in insufficient heat exchange efficiency of the vaporizer. In the prior art, in order to avoid affecting the normal hydrogenation operation of the hydrogenator, when the frost or ice seriously affects the vaporizer outlet temperature, the vaporizer is defrosted and de-iced by controlling the liquid hydrogen pump to stop. In addition, in the prior art, when the buffer tank pressure is higher than the preset threshold, the liquid hydrogen pump is also controlled to stop in order to avoid overpressure in the buffer tank. Frequent pump shutdowns at hydrogenation stations will cause hydrogenation interruptions, which in turn will lead to interruptions in hydrogenation services at hydrogenation stations, which will seriously affect the working efficiency of hydrogenation stations.

[0004] Therefore, how to provide a control method for a hydrogen refueling station to reduce the frequency of service interruptions at the hydrogen refueling station has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The present application provides a control method, system, device, controller and storage medium of a hydrogen refueling station, which are used to reduce the frequency of service interruptions of the hydrogen refueling station.

[0006] The present application provides a control method for a hydrogen refueling station, comprising:

[0007] During the operation of the hydrogen refueling station, the temperature of the vaporizer outlet and the buffer tank pressure are obtained;

[0008] When the carburetor outlet temperature is lower than the first preset temperature and the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the buffer tank pressure so that the buffer tank pressure tends to the ideal pressure value, wherein the pressure threshold corresponding to the current temperature changes dynamically with the current temperature of the buffer tank;

[0009] When the carburetor outlet temperature is lower than the first preset temperature and the buffer tank pressure is less than or equal to the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the carburetor outlet temperature so that the carburetor temperature tends to an ideal temperature value.

[0010] The beneficial effects of the present application are: during the operation of the hydrogen station, the temperature of the vaporizer outlet and the buffer tank pressure are obtained; when the vaporizer outlet temperature is lower than the first preset temperature and the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the buffer tank pressure so that the buffer tank pressure tends to the ideal pressure value, wherein the pressure threshold corresponding to the current temperature changes dynamically with the current temperature of the buffer tank; when the vaporizer outlet temperature is lower than the first preset temperature and the buffer tank pressure is less than or equal to the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the vaporizer outlet temperature so that the vaporizer temperature tends to the ideal temperature value. Furthermore, the present application can obtain the temperature and buffer tank pressure of the vaporizer outlet in real time and make dynamic adjustments to control the temperature and buffer tank pressure of the vaporizer to tend to the ideal value, thereby reducing the situation where the pump is stopped due to the vaporizer temperature being too low or the buffer tank pressure being too high, and reducing the frequency of hydrogen station service interruptions.

[0011] In one embodiment, the method further comprises:

[0012] When adjusting the flow rate of the hydraulic oil according to the carburetor outlet temperature, monitoring the pressure of the buffer tank;

[0013] When the buffer tank pressure is greater than a pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the buffer tank pressure.

[0014] In one embodiment, the method further comprises:

[0015] When the evaporator outlet temperature is lower than a second preset temperature, an opening instruction is sent to the fan located at the top of the evaporator to increase the heat exchange amount of the evaporator, wherein the second preset temperature is greater than the first preset temperature.

[0016] In one embodiment, adjusting the flow rate of the hydraulic oil according to the carburetor outlet temperature includes:

[0017] Determining at least one of the following preset parameter values ​​of the current vaporizer;

[0018] Substituting the preset parameter value of the current vaporizer into the preset formula to determine the cooling capacity corresponding to the current vaporizer;

[0019] Calculate the current target flow rate of hydraulic oil according to the cooling capacity corresponding to the current vaporizer;

[0020] Adjust the current hydraulic oil flow rate to the current hydraulic oil target flow rate.

[0021] In one embodiment, adjusting the current flow rate of the hydraulic oil to the current target flow rate of the hydraulic oil includes:

[0022] Calculate the target speed of the drive motor corresponding to the control of the hydraulic oil amount according to the target flow rate of the hydraulic oil;

[0023] The rotation speed of the driving motor for controlling the amount of hydraulic oil is adjusted to the target rotation speed, so as to adjust the current flow rate of the hydraulic oil to the target flow rate.

[0024] In one embodiment, adjusting the current flow rate of the hydraulic oil to the current target flow rate of the hydraulic oil includes:

[0025] Calculating a target angle of a hydraulic swash plate according to a target flow rate of the hydraulic oil, wherein the hydraulic swash plate angle is positively correlated with the flow rate of the hydraulic oil;

[0026] The angle of the hydraulic swash plate is controlled to be adjusted to the target angle, so as to adjust the current flow rate of the hydraulic oil to the target flow rate.

[0027] The present application also provides a control system for a hydrogen refueling station, comprising:

[0028] A controller, used to execute the control method of the hydrogen refueling station described in any of the above embodiments;

[0029] A vaporizer, used to convert the input liquid hydrogen into gaseous hydrogen;

[0030] The buffer tank is used to store the gaseous hydrogen converted by the vaporizer.

[0031] In one embodiment, the control system further comprises:

[0032] A temperature sensor, used for collecting the temperature of the vaporizer outlet and sending the temperature of the vaporizer outlet to the controller;

[0033] The pressure sensor is used to collect the pressure of the buffer tank and send the pressure of the buffer tank to the controller.

[0034] In one embodiment, the control system further comprises:

[0035] Liquid hydrogen storage tank, used to store liquid hydrogen;

[0036] A liquid hydrogen pump is used to pump the liquid hydrogen in the liquid hydrogen storage tank into the vaporizer.

[0037] In one embodiment, the liquid hydrogen pump is connected to the hydraulic oil pump through a hydraulic oil pipeline, and the hydraulic oil pump is connected to the drive motor. The greater the speed of the drive motor, the greater the hydraulic oil flow of the hydraulic oil pump, and the more liquid hydrogen is pumped out by the liquid hydrogen pump.

[0038] In one embodiment, the control system further comprises:

[0039] A frequency converter is used to control the rotation speed of the drive motor.

[0040] The present application also provides a control device for a hydrogen refueling station, comprising:

[0041] An acquisition module is used to obtain the temperature of the vaporizer outlet and the buffer tank pressure during the operation of the hydrogen station;

[0042] A first adjustment module is used to adjust the flow rate of the hydraulic oil according to the buffer tank pressure when the vaporizer outlet temperature is lower than the first preset temperature and the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, so that the buffer tank pressure tends to the ideal pressure value, wherein the pressure threshold corresponding to the current temperature changes dynamically with the current temperature of the buffer tank;

[0043] The second adjustment module is used to adjust the flow rate of the hydraulic oil according to the vaporizer outlet temperature when the vaporizer outlet temperature is lower than the first preset temperature and the buffer tank pressure is less than or equal to the pressure threshold corresponding to the current temperature, so that the vaporizer temperature tends to an ideal temperature value.

[0044] In one embodiment, the apparatus further comprises:

[0045] A monitoring module, for monitoring the pressure of the buffer tank when adjusting the flow of the hydraulic oil according to the carburetor outlet temperature;

[0046] The adjustment module is used to adjust the flow rate of the hydraulic oil according to the buffer tank pressure when the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature.

[0047] In one embodiment, the apparatus further comprises:

[0048] The opening module is used to send an opening instruction to the fan located at the top of the evaporator to increase the heat exchange capacity of the evaporator when the evaporator outlet temperature is lower than a second preset temperature, wherein the second preset temperature is greater than the first preset temperature.

[0049] In one embodiment, the first adjustment module further includes:

[0050] A first determination submodule, used to determine a preset parameter value of the current vaporizer;

[0051] The second determination submodule is used to substitute the preset parameter value of the current vaporizer into the preset formula to determine the cooling capacity corresponding to the current vaporizer;

[0052] The first calculation submodule is used to calculate the current target flow rate of the hydraulic oil according to the cooling capacity corresponding to the current vaporizer;

[0053] The adjustment submodule is used to adjust the current flow rate of the hydraulic oil to the current target flow rate of the hydraulic oil.

[0054] In one embodiment, the adjustment submodule is further used to:

[0055] Calculate the target speed of the drive motor corresponding to the control of the hydraulic oil amount according to the target flow rate of the hydraulic oil;

[0056] The rotation speed of the driving motor for controlling the amount of hydraulic oil is adjusted to the target rotation speed, so as to adjust the current flow rate of the hydraulic oil to the target flow rate.

[0057] In one embodiment, the adjustment submodule is further used to:

[0058] Calculating a target angle of a hydraulic swash plate according to a target flow rate of the hydraulic oil, wherein the hydraulic swash plate angle is positively correlated with the flow rate of the hydraulic oil;

[0059] The angle of the hydraulic swash plate is controlled to be adjusted to the target angle, so as to adjust the current flow rate of the hydraulic oil to the target flow rate.

[0060] The present application also provides a controller, comprising:

[0061] at least one processor; and,

[0062] a memory communicatively connected to the at least one processor; wherein,

[0063] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to implement the control method of the hydrogen refueling station described in any of the above embodiments.

[0064] The present application also provides a computer-readable storage medium. When the instructions in the storage medium are executed by a processor corresponding to the controller, the controller can implement the control method of the hydrogen refueling station described in any of the above embodiments.

[0065] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings.

[0066] The technical solution of the present application is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0068] Figure 1 This is a flow chart of a control method for a hydrogen refueling station in one embodiment of the present application;

[0069] Figure 2This is a schematic diagram of the structure of a control system of a hydrogen refueling station in one embodiment of the present application;

[0070] Figure 3 This is a carburetor temperature control curve diagram in one embodiment of the present application;

[0071] Figure 4 This is a block diagram of a cascade continuous control loop for the vaporizer temperature in one embodiment of the present application;

[0072] Figure 5 This is a block diagram of a single-loop continuous control of the temperature of a vaporizer in one embodiment of the present application;

[0073] Figure 6 This is a block diagram of a buffer tank pressure cascade continuous control loop in one embodiment of the present application;

[0074] Figure 7 This is a block diagram of a single-loop continuous control of the buffer tank pressure in one embodiment of the present application;

[0075] Figure 8 This is a block diagram of a control device of a hydrogen refueling station in one embodiment of the present application;

[0076] Fig. 9 The figure is a schematic diagram of the hardware structure of a controller in one embodiment of the present application. DETAILED DESCRIPTION

[0077] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0078] Figure 1 Flow chart of a control method of a hydrogen refueling station in one embodiment of the present application. Figure 1 As shown, the method can be implemented as the following steps S101-S103:

[0079] In step S101, during the operation of the hydrogenation station, the temperature of the vaporizer outlet and the buffer tank pressure are obtained;

[0080] In step S102, when the carburetor outlet temperature is lower than the first preset temperature and the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the buffer tank pressure so that the buffer tank pressure tends to the ideal pressure value, wherein the pressure threshold corresponding to the current temperature changes dynamically with the current temperature of the buffer tank;

[0081] In step S103, when the vaporizer outlet temperature is lower than the first preset temperature and the buffer tank pressure is less than or equal to the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the vaporizer outlet temperature so that the vaporizer temperature tends to the ideal temperature value.

[0082] like Figure 2 The structure diagram of a control system of a hydrogen refueling station in one embodiment of the present application is shown, which is composed of a liquid hydrogen storage tank, a liquid hydrogen pump, a vaporizer, a buffer tank, a hydrogenation machine, a controller and connecting pipes, valves, instruments and other accessories. When a liquid hydrogen storage type hydrogenation station refuels a user vehicle with high-pressure gas hydrogen, it is necessary to vaporize the liquid hydrogen into high-pressure gas hydrogen in the vaporizer, and the high-pressure gas hydrogen is temporarily stored in the buffer tank. When a user vehicle comes to refuel, the hydrogenation machine is used to refuel the user vehicle with high-pressure gas hydrogen. In the prior art, when the vaporizer temperature is too low or the buffer tank pressure is too high, the vaporizer temperature and the buffer tank pressure are adjusted by stopping the liquid hydrogen pump. Stopping the pump will cause a temporary interruption of the hydrogenation service. Therefore, in order to avoid stopping the pump as much as possible, the present application dynamically adjusts the vaporizer temperature and the buffer tank pressure in real time to keep the vaporizer temperature and the buffer tank pressure at the set value, thereby reducing the frequency of stopping the pump and interrupting the hydrogenation service.

[0083] In the present application, firstly, during the operation of the hydrogen refueling station, the temperature of the vaporizer outlet and the buffer tank pressure are obtained; wherein, the vaporizer outlet temperature can be measured and monitored using a temperature sensor, such as a thermocouple or thermistor, etc.; the buffer tank pressure can be measured using a pressure sensor.

[0084] Secondly, when the carburetor outlet temperature is lower than the first preset temperature and the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, the flow of the hydraulic oil is adjusted according to the buffer tank pressure so that the buffer tank pressure tends to the ideal pressure value. Among them, the first preset temperature can be a pre-set temperature value, and the pressure threshold corresponding to the current temperature changes dynamically with the current temperature of the buffer tank. Specifically, the pressure threshold is an optimal value automatically calculated after considering the influence of temperature, and changes with temperature. In one embodiment, the pressure threshold can be determined by the following formula:

[0085]

[0086] Among them, P is the pressure threshold; V is the volume of the buffer tank; Z is the compression coefficient of hydrogen, which is related to the current pressure of the buffer tank and can be determined by querying a pre-stored corresponding relationship table; n is the number of hydrogen moles; R is the hydrogen gas constant; and T is the current absolute temperature of the buffer tank.

[0087] In order to avoid affecting the hydrogenation service, when the vaporizer outlet temperature is lower than the first preset temperature or the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, the present application adjusts the vaporizer outlet temperature or the buffer tank pressure by adjusting the hydraulic oil flow rate and then changing the speed of the liquid hydrogen pump. When both are met, the present application gives priority to adjusting the pressure and giving priority to ensuring pressure safety. When adjusting the buffer tank pressure, when the buffer tank pressure is at a lower pressure threshold, the pressure is relatively low, and the pump speed runs stably at the rated operating conditions; when the pressure reaches the pressure threshold, the pump speed is changed to automatic control, and the controller calculates the optimal hydraulic oil flow value, and uses the calculation result as the set value of the hydraulic oil pump speed, and adjusts the hydraulic oil flow rate according to the buffer tank pressure. Specifically, there are many ways to determine.

[0088] Method 1

[0089] The difference between the buffer tank pressure and the ideal pressure value is calculated, and the second target flow rate of the hydraulic oil is determined by querying a preset comparison table according to the pressure difference between the buffer tank pressure and the ideal pressure value. The preset comparison table stores the corresponding relationship between different buffer tank pressure differences and hydraulic oil volumes.

[0090] Method 2

[0091] The hydrogen content that needs to be reduced is determined based on the difference between the buffer tank pressure and the ideal pressure value, and the average hydrogen refueling rate of the hydrogen refueling station is determined; further, the average speed of injecting hydrogen into the buffer tank within the preset pressure drop time can be determined; and the second target flow rate of the hydraulic oil is determined based on the average speed of injecting hydrogen into the buffer tank.

[0092] When the vaporizer outlet temperature is lower than the first preset temperature and the buffer tank pressure is less than or equal to the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the vaporizer outlet temperature so that the vaporizer temperature tends to the ideal temperature value. Since the buffer tank pressure is less than or equal to the pressure threshold corresponding to the current temperature, it means that there is no risk of excessive pressure in the buffer tank pressure at this time. If the vaporizer outlet temperature is lower than the first preset temperature at this time, in order to avoid affecting the hydrogenation service, the flow rate of the hydraulic oil is adjusted according to the vaporizer outlet temperature. When adjusting the vaporizer outlet temperature, in order to determine the target flow rate of the hydraulic oil according to the current vaporizer outlet temperature, it is necessary to determine the preset parameter values ​​of the current vaporizer, wherein the preset parameters include the vaporizer outlet gas enthalpy, the vaporizer inlet liquid enthalpy, the heat transfer per unit time in the liquid phase region of the heat pipe, the heat transfer per unit time in the gas phase region of the heat pipe, and the number of rows of heat pipes. The enthalpy value of the gas at the outlet of the vaporizer and the enthalpy value of the liquid at the inlet of the vaporizer can be obtained by querying the pre-stored corresponding relationship table of temperature, pressure and enthalpy value according to the current temperature and pressure of the inlet and outlet of the vaporizer; the number of rows of heat pipes can be preset according to the structure of the vaporizer; the heat transfer per unit time in the liquid phase area of ​​the heat pipe and the heat transfer per unit time in the gas phase area of ​​the heat pipe can be the values ​​obtained in advance by experiments, or can be determined by the following formula:

[0093] The heat transfer per unit time in the liquid phase region of the heat pipe is determined according to the following formula:

[0094]

[0095] in, is the heat transfer per unit time in the liquid phase of the heat pipe, is the heat transfer coefficient of the liquid phase, is the liquid phase area, is the temperature difference in the liquid phase;

[0096] The heat transfer per unit time in the gas phase region of the heat transfer pipe is determined according to the following formula:

[0097] Q g =K g *A g *Δt g ;

[0098] Among them, Q g K is the heat transfer per unit time in the gas phase of the heat transfer tube, g is the heat transfer coefficient of the gas phase, A g is the gas phase area, Δt g is the temperature difference in the gas phase.

[0099] After obtaining the preset parameter values, the cooling capacity corresponding to the current vaporizer is determined according to the preset parameter values ​​of the current vaporizer. Specifically, the preset parameters of the current vaporizer are substituted into the following formula to determine the cooling capacity corresponding to the current vaporizer:

[0100]

[0101] Where m is the cooling capacity flow rate corresponding to the current vaporizer, that is, the mass of vaporized liquid per unit time, H in is the liquid enthalpy at the vaporizer inlet, H out is the enthalpy of the gas at the vaporizer outlet, Q is the heat transfer per unit time in the liquid phase of the heat pipe, g is the heat transfer amount per unit time in the gas phase of the heat transfer pipe, and n is the number of rows of heat transfer pipes.

[0102] Furthermore, the current target flow rate of the hydraulic oil can be calculated based on the cooling capacity corresponding to the current vaporizer. Since the ideal temperature value is determined, the vaporizer cooling capacity that needs to be adjusted is determined based on the cooling capacity corresponding to the current vaporizer and the difference between the current vaporizer temperature and the ideal temperature value; and since the corresponding relationship between the hydraulic oil flow rate and the vaporizer cooling capacity can be obtained in advance during the operation of the liquid hydrogen pump, the current target flow rate of the hydraulic oil can be calculated by substituting the vaporizer cooling capacity that needs to be adjusted into the corresponding relationship between the hydraulic oil flow rate and the vaporizer cooling capacity, and the current hydraulic oil flow rate is adjusted to the current target flow rate of the hydraulic oil.

[0103] It is understandable that when the carburetor outlet temperature is greater than or equal to the first preset temperature, the flow rate of the hydraulic oil is only adjusted according to the buffer tank pressure. In addition, in order to avoid the situation where the buffer tank pressure is too high during the carburetor outlet temperature recovery process, when adjusting the flow rate of the hydraulic oil according to the carburetor outlet temperature, the buffer tank pressure is monitored, and the buffer tank pressure is compared with the pressure threshold corresponding to the current temperature. When the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is stopped from being adjusted according to the carburetor outlet temperature, and the flow rate of the hydraulic oil is adjusted according to the buffer tank pressure instead.

[0104] Then, the carburetor temperature can be controlled to tend to the ideal temperature value or the ideal pressure value according to the target flow rate of the hydraulic oil. There are three methods to control the flow rate of hydraulic oil. The first is to adjust the angle of the hydraulic swash plate. For example, the target angle of the hydraulic swash plate is calculated according to the target flow rate of the hydraulic oil, and then the angle of the hydraulic swash plate is controlled to be adjusted to the target angle to adjust the current flow rate of the hydraulic oil to the target flow rate. The second is to adjust the speed of the drive motor through the frequency converter to adjust the hydraulic oil flow rate to the target flow rate. The third is the first two combined adjustments. The speed of the hydraulic oil pump motor and the target angle of the hydraulic swash plate are adjusted at the same time to adjust the current flow rate of the hydraulic oil to the target flow rate.

[0105] In addition, for the vaporizer temperature control, as Figure 3 shown, it is the vaporizer temperature control curve graph in an embodiment of the present application. In Figure 3 the shown embodiment, with the change of the vaporizer outlet temperature, two temperature control thresholds a and b are preset, where a > b. The temperature from a to b is the cooling process. The first preset temperature, i.e., the threshold b, is the hydraulic oil flow rate adjustment threshold. In addition, a second preset temperature, i.e., the threshold a, can also be set as the forced convection开启 threshold. The specific control process is as follows:

[0106] (1) Under normal operation of the hydrogen refueling station, the vaporizer outlet temperature T > a;

[0107] (2) When the vaporizer outlet temperature b < T ≤ a, it indicates that icing or frosting affects the vaporization heat exchange efficiency. By sending an opening command to the fan located at the top of the vaporizer, the forced convection is turned on to increase the heat exchange amount of the vaporizer. If the vaporizer outlet temperature rises above a under the condition of turning on the forced convection, the forced convection is turned off;

[0108] (3) If the vaporizer outlet temperature continues to drop below the first preset temperature b, when T ≤ b, the controller reduces the pump speed by changing the hydraulic oil flow rate to reduce the cold quantity entering the vaporizer. Specifically, the controller forms a vaporizer outlet temperature - hydraulic oil flow rate control loop by switching the control signal structure. This loop matches and adjusts the cold quantity entering the vaporizer according to the remaining capacity of the vaporizer, exerting the maximum capacity of the system. If the temperature rises and exceeds the threshold b, the hydraulic oil flow rate is controlled to return to the normal value to increase the pump speed to the normal state.

[0109] Among them, in an embodiment of the present application, the temperature control loop is as Figure 4In the temperature cascade continuous control loop shown, the vaporizer outlet temperature is the main controlled variable, and the hydraulic oil flow rate is the secondary controlled variable. The vaporizer outlet temperature is obtained in real time, and the real-time obtained vaporizer outlet temperature is input into the temperature controller for comparison with the temperature setting value. The temperature controller determines the hydraulic oil flow setting value according to the difference between the vaporizer outlet temperature and the temperature setting value; the real-time obtained hydraulic oil flow and the hydraulic oil flow setting value are then input into the flow controller to determine the hydraulic oil flow adjustment value; according to the relationship between the hydraulic oil flow adjustment value and the drive motor speed, the drive motor speed is determined to be the target speed; finally, the drive motor speed is adjusted to the target speed through the frequency converter. Furthermore, based on the real-time obtained vaporizer outlet temperature, the hydraulic oil amount is adjusted, thereby realizing the adjustment of the vaporizer outlet temperature, and the process is real-time dynamic adjustment. If the vaporizer outlet temperature is low, the hydraulic oil flow rate becomes smaller, the amount of liquid hydrogen entering the vaporizer becomes smaller, and the vaporizer outlet temperature rises. If the temperature recovery is not enough, the controller continues to reduce the hydraulic oil flow until the hydraulic oil flow rate is zero. In another embodiment of the present application, the temperature control loop is as follows Figure 5 The temperature single-loop continuous control loop shown is adjusted only according to the difference between the temperature at the vaporizer outlet and the ideal temperature value.

[0110] Figure 6 This is a block diagram of a buffer tank pressure cascade continuous control loop in one embodiment of the present application. Figure 7 This is a block diagram of a single-loop continuous control of the buffer tank pressure in one embodiment of the present application. Similarly, the buffer tank pressure can also be regulated by a cascade continuous control loop or a single-loop continuous control loop.

[0111] Since the temperature control and pressure control processes can be combined in different ways, start-stop control, cascade continuous control loop and single-loop continuous control loop solutions can be used respectively. Considering various combinations, there are eight variant solutions in this case. They are:

[0112] 1) Pressure start-stop control, temperature cascade continuous control;

[0113] 2) Pressure start-stop control, temperature single-loop continuous control;

[0114] 3) Pressure cascade continuous control and temperature start and stop control;

[0115] 4) Pressure single loop continuous control, temperature start and stop control;

[0116] 5) Cascade continuous control of pressure and temperature;

[0117] 6) Single-loop continuous control of pressure and cascade continuous control of temperature;

[0118] 7) Pressure cascade continuous control, temperature single loop continuous control;

[0119] 8) Single-loop continuous control of pressure and single-loop continuous control of temperature.

[0120] In addition, if the variable frequency regulation of the hydraulic oil pump is replaced by automatic adjustment of the swash plate angle, the above 8 control schemes can be transformed into another 8 variant schemes.

[0121] The beneficial effects of the present application are: during the operation of the hydrogen station, the temperature of the vaporizer outlet and the buffer tank pressure are obtained; when the vaporizer outlet temperature is lower than the first preset temperature and the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the buffer tank pressure so that the buffer tank pressure tends to the ideal pressure value, wherein the pressure threshold corresponding to the current temperature changes dynamically with the current temperature of the buffer tank; when the vaporizer outlet temperature is lower than the first preset temperature and the buffer tank pressure is less than or equal to the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the vaporizer outlet temperature so that the vaporizer temperature tends to the ideal temperature value. Furthermore, the present application can obtain the temperature and buffer tank pressure of the vaporizer outlet in real time and make dynamic adjustments to control the temperature and buffer tank pressure of the vaporizer to tend to the ideal value, thereby reducing the situation where the pump is stopped due to the vaporizer temperature being too low or the buffer tank pressure being too high, and reducing the frequency of hydrogen station service interruptions.

[0122] In one embodiment, the method can also be implemented as the following steps A1-A2:

[0123] In step A1, when adjusting the flow rate of the hydraulic oil according to the carburetor outlet temperature, the pressure of the buffer tank is monitored;

[0124] In step A2, when the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the buffer tank pressure.

[0125] In this embodiment, in order to avoid the situation where the buffer tank pressure is too high during the recovery of the vaporizer outlet temperature, when the flow rate of the hydraulic oil is adjusted according to the vaporizer outlet temperature, the buffer tank pressure is monitored, and the buffer tank pressure is compared with the pressure threshold corresponding to the current temperature. When the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is stopped being adjusted according to the vaporizer outlet temperature, and the flow rate of the hydraulic oil is adjusted according to the buffer tank pressure instead.

[0126] In one embodiment, the above method can also be implemented as the following step A3:

[0127] In step A3, when the evaporator outlet temperature is lower than a second preset temperature, an opening instruction is issued to the fan located at the top of the evaporator to increase the heat exchange capacity of the evaporator, wherein the second preset temperature is greater than the first preset temperature.

[0128] In this embodiment, when the evaporator outlet temperature is low but not lower than the first preset temperature, the heat exchange efficiency of the evaporator has been reduced. In order to increase the heat exchange of the evaporator, Figure 2 As shown, a second preset temperature a is set. When the evaporator outlet temperature T≤a, a start instruction is issued to the fan located at the top of the evaporator to start forced convection to increase the heat exchange of the evaporator, wherein the second preset temperature a is greater than the first preset temperature b. When forced convection is turned on, the controller PLC outputs a switch quantity, driving the relay to operate the circuit breaker of the fan power supply located in the switchboard to close, the fan power supply is turned on, and the fan is running to achieve forced convection.

[0129] In one embodiment, the step S103 of adjusting the flow rate of the hydraulic oil according to the carburetor outlet temperature may be implemented as the following steps B1-B4:

[0130] In step B1, the preset parameter value of the current vaporizer is determined;

[0131] In step B2, the preset parameter value of the current vaporizer is substituted into the preset formula to determine the cooling capacity corresponding to the current vaporizer;

[0132] In step B3, the current target flow rate of the hydraulic oil is calculated according to the cooling capacity corresponding to the current vaporizer;

[0133] In step B4, the current flow rate of the hydraulic oil is adjusted to the current target flow rate of the hydraulic oil.

[0134] In this embodiment, in order to quickly adjust the evaporator outlet temperature through the system, the cooling amount entering the evaporator is adjusted according to the remaining capacity of the evaporator, that is, the cooling amount entering the evaporator is adjusted according to the current vaporization capacity of the evaporator to bring into play the maximum capacity of the system.

[0135] In order to determine the first target flow rate of the hydraulic oil according to the current vaporizer outlet temperature, first, determine the preset parameter value of the current vaporizer, and determine at least one of the following parameters of the current vaporizer: vaporizer outlet gas enthalpy value, vaporizer inlet liquid enthalpy value, heat transfer per unit time in the liquid phase region of the heat pipe, heat transfer per unit time in the gas phase region of the heat pipe, and the number of rows of heat pipes. There are many ways to determine the corresponding parameters, and the present application does not limit the specific determination method. For example, the vaporizer outlet gas enthalpy value and the vaporizer inlet liquid enthalpy value can be obtained according to the current vaporizer inlet and outlet temperatures and pressures by querying a pre-stored correspondence table of temperature, pressure and enthalpy values; the number of rows of heat pipes can be preset according to the structure of the vaporizer; the heat transfer per unit time in the liquid phase region of the heat pipe and the heat transfer per unit time in the gas phase region of the heat pipe can be values ​​obtained in advance by experiments, or can be determined by the following formula:

[0136] The heat transfer per unit time in the liquid phase region of the heat pipe is determined according to the following formula:

[0137]

[0138] in, is the heat transfer per unit time in the liquid phase of the heat pipe, is the heat transfer coefficient of the liquid phase, is the liquid phase area, is the temperature difference in the liquid phase;

[0139] The heat transfer per unit time in the gas phase region of the heat transfer pipe is determined according to the following formula:

[0140] Q g =K g *A g *Δt g ;

[0141] Among them, Q g K is the heat transfer per unit time in the gas phase of the heat transfer tube, g is the heat transfer coefficient of the gas phase, A g is the gas phase area, Δt g is the temperature difference in the gas phase.

[0142] Then, the cooling capacity corresponding to the current evaporator is determined according to the preset parameter values ​​of the current evaporator. Specifically, the preset parameters of the current evaporator are substituted into the following formula to determine the cooling capacity corresponding to the current evaporator:

[0143]

[0144] Where m is the cooling capacity flow rate corresponding to the current vaporizer, that is, the mass of vaporized liquid per unit time, H in is the liquid enthalpy at the vaporizer inlet, H out is the enthalpy of the gas at the vaporizer outlet, Q is the heat transfer per unit time in the liquid phase of the heat pipe, g is the heat transfer amount per unit time in the gas phase of the heat transfer pipe, and n is the number of rows of heat transfer pipes.

[0145] Finally, the current target flow rate of the hydraulic oil is calculated according to the cooling capacity corresponding to the current vaporizer. Since the ideal temperature value is determined, the vaporizer cooling capacity that needs to be adjusted is determined according to the cooling capacity corresponding to the current vaporizer and the difference between the current vaporizer temperature and the ideal temperature value; and since the corresponding relationship between the hydraulic oil flow rate and the vaporizer cooling capacity can be obtained in advance during the operation of the liquid hydrogen pump, the target flow rate of the hydraulic oil can be calculated by substituting the vaporizer cooling capacity that needs to be adjusted into the corresponding relationship between the hydraulic oil flow rate and the vaporizer cooling capacity.

[0146] In one embodiment, the above step B1 can be implemented as follows:

[0147] Determine at least one of the following parameters of the current carburetor:

[0148] The enthalpy of the gas at the vaporizer outlet, the enthalpy of the liquid at the vaporizer inlet, the heat transfer per unit time in the liquid phase of the heat pipe, the heat transfer per unit time in the gas phase of the heat pipe, and the number of rows of heat pipes;

[0149] The heat transfer per unit time in the liquid phase region of the heat pipe is determined according to the following formula:

[0150]

[0151] in, is the heat transfer per unit time in the liquid phase of the heat pipe, is the heat transfer coefficient of the liquid phase, is the liquid phase area, is the temperature difference in the liquid phase;

[0152] The heat transfer per unit time in the gas phase region of the heat transfer pipe is determined according to the following formula:

[0153] Q g =K g *A g *Δt g ;

[0154] Among them, Q g K is the heat transfer per unit time in the gas phase of the heat transfer tube, g is the heat transfer coefficient of the gas phase, A g is the gas phase area, Δt g is the temperature difference in the gas phase.

[0155] In one embodiment, the above step B2 may be implemented as follows:

[0156] Substitute the preset parameters of the current evaporator into the following formula to determine the corresponding cooling capacity of the current evaporator:

[0157]

[0158] Where m is the cooling capacity flow rate corresponding to the current vaporizer, that is, the mass of vaporized liquid per unit time, H in is the liquid enthalpy at the vaporizer inlet, H out is the enthalpy of the gas at the vaporizer outlet, Q is the heat transfer per unit time in the liquid phase of the heat pipe, g is the heat transfer amount per unit time in the gas phase of the heat transfer pipe, and n is the number of rows of heat transfer pipes.

[0159] In one embodiment, the step S103 of adjusting the current flow rate of the hydraulic oil to the target flow rate of the current hydraulic oil may be implemented as the following steps C1-C2:

[0160] In step C1, a target speed corresponding to a driving motor for controlling the amount of hydraulic oil is calculated according to a target flow rate of the hydraulic oil;

[0161] In step C2, the rotation speed of the driving motor for controlling the amount of hydraulic oil is adjusted to the target rotation speed, so as to adjust the current flow rate of the hydraulic oil to the target flow rate.

[0162] In this embodiment, the flow rate of the hydraulic oil is regulated by adjusting the rotation speed of the driving motor.

[0163] The target speed corresponding to the driving motor for controlling the amount of hydraulic oil is calculated according to the target flow rate of the hydraulic oil. Specifically, the corresponding relationship between the target flow rate of the hydraulic oil and the speed of the driving motor can be determined by a preliminary experiment, and then the target speed of the driving motor corresponding to the target flow rate is determined by substituting the target flow rate into the corresponding relationship. Then, the speed of the driving motor for controlling the amount of hydraulic oil is adjusted to the target speed to achieve the regulation of the hydraulic oil flow rate.

[0164] In one embodiment, the step S103 of adjusting the current flow rate of the hydraulic oil to the target flow rate of the current hydraulic oil may be implemented as the following steps D1-D2:

[0165] In step D1, a target angle of a hydraulic swash plate is calculated according to a target flow rate of hydraulic oil, wherein the hydraulic swash plate angle is positively correlated with the flow rate of hydraulic oil;

[0166] In step D2, the angle of the hydraulic swash plate is controlled to be adjusted to the target angle, so as to adjust the current flow rate of the hydraulic oil to the target flow rate.

[0167] In this embodiment, the hydraulic oil flow is regulated by adjusting the angle of the hydraulic swash plate.

[0168] The target angle of the hydraulic swash plate is calculated according to the target flow rate of the hydraulic oil, wherein the hydraulic swash plate angle is positively correlated with the hydraulic oil flow rate. According to different equipment, the corresponding relationship between the hydraulic oil flow rate and the angle of the hydraulic swash plate can be obtained in advance through experiments, and the target angle of the hydraulic swash plate is determined by substituting the target flow rate of the hydraulic oil into the preset corresponding relationship. The controller issues an instruction to control the angle of the hydraulic swash plate to be adjusted to the target angle.

[0169] It should be noted that the pressure control method of the present application is based on the transition process characteristics of the controller, and selects an optimal value in the safe operating range as the pressure setting value of the automatic control loop. This value is very close to the upper limit of the pressure, which can ensure the best pressure buffering effect under the premise of safety. After the pressure exceeds this value, the proportional-integral controller will continue to increase the adjustment action. Unless the pressure returns to this value or below, the pump speed will continue to decrease until the pump speed is reduced to zero. Therefore, the optimal value ensures that the instantaneous pressure is not over-pressured, and also ensures that there is no over-pressure when the ambient temperature is reached in the future. Pressure control is safe even when there is no car to refuel. The optimal value is the pressure threshold corresponding to the current temperature in the aforementioned embodiment.

[0170] During the automatic pressure control process, when the pump speed needs to be reduced, the automatic control loop reduces the pump speed according to the aforementioned calculation output, and the reduction amount is determined by the automatic calculation of the feedback control. On the other hand, when the pressure value does not reach the optimal value, that is, when both the instantaneous pressure and the future pressure are less than the optimal value, the pump speed operates at the pre-set pump speed.

[0171] Through the above control method, it is achieved that below the optimal value, the pump runs at the set speed, and above the optimal value, the pump slows down under automatic control. If the pressure value is not less than or equal to the optimal value, it will continue to drop until it drops to zero (stop the pump). At the same time, the optimal value is close to the safety limit, achieving edge operation and achieving the best process indicators. When the above method is actually operated, the optimal value is much higher than the fixed threshold in the relevant technology, and a significant improvement in process indicators is achieved while ensuring safety.

[0172] Figure 2 FIG. 1 is a schematic diagram of a control system of a hydrogen refueling station in an embodiment of the present application. Figure 2 As shown, the system includes:

[0173] A controller, used to execute the control method of the hydrogen refueling station described in any of the above embodiments;

[0174] A vaporizer, used to convert the input liquid hydrogen into gaseous hydrogen;

[0175] The buffer tank is used to store the gaseous hydrogen converted by the vaporizer.

[0176] In one embodiment, the control system further comprises:

[0177] A temperature sensor, used for collecting the temperature of the vaporizer outlet and sending the temperature of the vaporizer outlet to the controller;

[0178] The pressure sensor is used to collect the pressure of the buffer tank and send the pressure of the buffer tank to the controller.

[0179] In one embodiment, the control system further comprises:

[0180] Liquid hydrogen storage tank, used to store liquid hydrogen;

[0181] A liquid hydrogen pump is used to pump the liquid hydrogen in the liquid hydrogen storage tank into the vaporizer.

[0182] In one embodiment, the liquid hydrogen pump is connected to the hydraulic oil pump through a hydraulic oil pipeline, and the hydraulic oil pump is connected to the drive motor. The greater the speed of the drive motor, the greater the hydraulic oil flow of the hydraulic oil pump, and the more liquid hydrogen is pumped out by the liquid hydrogen pump.

[0183] In one embodiment, the control system further comprises:

[0184] A frequency converter is used to control the rotation speed of the drive motor.

[0185] Figure 8 This is a block diagram of a control device for a hydrogen refueling station in an embodiment of the present application, including:

[0186] The acquisition module 801 is used to obtain the temperature of the vaporizer outlet and the buffer tank pressure during the operation of the hydrogenation station;

[0187] The first adjustment module 802 is used to adjust the flow rate of the hydraulic oil according to the buffer tank pressure when the vaporizer outlet temperature is lower than the first preset temperature and the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, so that the buffer tank pressure tends to the ideal pressure value, wherein the pressure threshold corresponding to the current temperature changes dynamically with the current temperature of the buffer tank;

[0188] The second adjustment module 803 is used to adjust the flow rate of the hydraulic oil according to the vaporizer outlet temperature when the vaporizer outlet temperature is lower than the first preset temperature and the buffer tank pressure is less than or equal to the pressure threshold corresponding to the current temperature, so that the vaporizer temperature tends to the ideal temperature value.

[0189] In one embodiment, the apparatus further comprises:

[0190] A monitoring module, for monitoring the pressure of the buffer tank when adjusting the flow of the hydraulic oil according to the carburetor outlet temperature;

[0191] The adjustment module is used to adjust the flow rate of the hydraulic oil according to the buffer tank pressure when the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature.

[0192] In one embodiment, the apparatus further comprises:

[0193] The opening module is used to send an opening instruction to the fan located at the top of the evaporator to increase the heat exchange capacity of the evaporator when the evaporator outlet temperature is lower than a second preset temperature, wherein the second preset temperature is greater than the first preset temperature.

[0194] In one embodiment, the first adjustment module further includes:

[0195] A first determination submodule, used to determine a preset parameter value of the current vaporizer;

[0196] The second determination submodule is used to substitute the preset parameter value of the current vaporizer into the preset formula to determine the cooling capacity corresponding to the current vaporizer;

[0197] The first calculation submodule is used to calculate the current target flow rate of the hydraulic oil according to the cooling capacity corresponding to the current vaporizer;

[0198] The adjustment submodule is used to adjust the current flow rate of the hydraulic oil to the current target flow rate of the hydraulic oil.

[0199] In one embodiment, the adjustment submodule is further used to:

[0200] Calculate the target speed of the drive motor corresponding to the control of the hydraulic oil amount according to the target flow rate of the hydraulic oil;

[0201] The rotation speed of the driving motor for controlling the amount of hydraulic oil is adjusted to the target rotation speed, so as to adjust the current flow rate of the hydraulic oil to the target flow rate.

[0202] In one embodiment, the adjustment submodule is further used to:

[0203] Calculating a target angle of a hydraulic swash plate according to a target flow rate of the hydraulic oil, wherein the hydraulic swash plate angle is positively correlated with the flow rate of the hydraulic oil;

[0204] The angle of the hydraulic swash plate is controlled to be adjusted to the target angle, so as to adjust the current flow rate of the hydraulic oil to the target flow rate.

[0205] Fig. 9 FIG. 1 is a schematic diagram of the hardware structure of a controller in an embodiment of the present application. Fig. 9 As shown, the controller includes:

[0206] at least one processor 920; and,

[0207] A memory 904 in communication with the at least one processor 920; wherein,

[0208] The memory 904 stores instructions that can be executed by the at least one processor 920, and the instructions are executed by the at least one processor 920 to implement the control method of the hydrogen refueling station described in any of the above embodiments.

[0209] Reference Fig. 9, the controller 900 may include one or more of the following components: a processing component 902 , a memory 904 , a power component 906 , a multimedia component 908 , an audio component 910 , an input / output (I / O) interface 912 , a sensor component 914 , and a communication component 916 .

[0210] The processing component 902 generally controls the overall operation of the controller 900. The processing component 902 may include one or more processors 920 to execute instructions to complete all or part of the steps of the above method. In addition, the processing component 902 may include one or more modules to facilitate the interaction between the processing component 902 and other components. For example, the processing component 902 may include a multimedia module to facilitate the interaction between the multimedia component 908 and the processing component 902.

[0211] The memory 904 is configured to store various types of data to support the operation of the controller 900. Examples of such data include instructions for any application or method operating on the controller 900, such as text, pictures, videos, etc. The memory 904 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0212] The power component 906 provides power to the various components of the controller 900. The power component 906 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the onboard control system 900.

[0213] The multimedia component 908 includes a screen that provides an output interface between the controller 900 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 908 may also include a front camera and / or a rear camera. When the controller 900 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

[0214] The audio component 910 is configured to output and / or input audio signals. For example, the audio component 910 includes a microphone (MIC), and when the controller 900 is in an operation mode, such as an alarm mode, a recording mode, a voice recognition mode, and a voice output mode, the microphone is configured to receive an external audio signal. The received audio signal can be further stored in the memory 904 or sent via the communication component 916. In some embodiments, the audio component 910 also includes a speaker for outputting audio signals.

[0215] I / O interface 912 provides an interface between processing component 902 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

[0216] The sensor assembly 914 includes one or more sensors for providing various aspects of status assessment for the controller 900. For example, the sensor assembly 914 may include a sound sensor. In addition, the sensor assembly 914 may detect the on / off state of the controller 900, the relative positioning of the components, such as the display and keypad of the controller 900, and the sensor assembly 914 may also detect the operating state of the controller 900 or a component of the controller 900, such as the operating state of the air distribution plate, the structural state, the operating state of the discharge scraper, etc., the orientation or acceleration / deceleration of the controller 900 and the temperature change of the controller 900. The sensor assembly 914 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 914 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 914 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, a material stacking thickness sensor or a temperature sensor.

[0217] The communication component 916 is configured to enable the controller 900 to provide the ability to communicate with other devices and cloud platforms in a wired or wireless manner. The controller 900 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 916 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 916 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0218] In an exemplary embodiment, the controller 900 can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components to execute the control method of the hydrogen refueling station described in any of the above embodiments.

[0219] The present application also provides a computer-readable storage medium. When the instructions in the storage medium are executed by a processor corresponding to the controller, the controller can implement the control method of the hydrogen refueling station described in any of the above embodiments.

[0220] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0221] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0222] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0223] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0224] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A control method for a hydrogen refueling station, characterized in that: include: During the operation of the hydrogen refueling station, the temperature of the vaporizer outlet and the buffer tank pressure are obtained; When the carburetor outlet temperature is lower than the first preset temperature and the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the buffer tank pressure so that the buffer tank pressure tends to the ideal pressure value, wherein the pressure threshold corresponding to the current temperature changes dynamically with the current temperature of the buffer tank; When the carburetor outlet temperature is lower than the first preset temperature and the buffer tank pressure is less than or equal to the pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the carburetor outlet temperature so that the carburetor temperature tends to the ideal temperature value; The method of adjusting the flow rate of the hydraulic oil according to the carburetor outlet temperature includes: Determine the preset parameter values ​​of the current vaporizer; Substituting the preset parameter value of the current vaporizer into the preset formula to determine the cooling capacity corresponding to the current vaporizer; Calculate the current target flow rate of hydraulic oil according to the cooling capacity corresponding to the current vaporizer; Adjust the current flow rate of the hydraulic oil to the current target flow rate of the hydraulic oil; Substituting the preset parameter value of the current vaporizer into the preset formula to determine the cooling capacity corresponding to the current vaporizer includes: Where m is the cooling capacity flow rate corresponding to the current vaporizer, that is, the mass of vaporized liquid per unit time, H in is the liquid enthalpy at the vaporizer inlet, H out is the enthalpy of the gas at the vaporizer outlet, Q is the heat transfer per unit time in the liquid phase of the heat pipe, g is the heat transfer amount per unit time in the gas phase of the heat transfer pipe, and n is the number of rows of heat transfer pipes.

2. The method according to claim 1, characterized in that The method further comprises: When adjusting the flow rate of the hydraulic oil according to the carburetor outlet temperature, monitoring the pressure of the buffer tank; When the buffer tank pressure is greater than a pressure threshold corresponding to the current temperature, the flow rate of the hydraulic oil is adjusted according to the buffer tank pressure.

3. The method according to claim 1, characterized in that The method further comprises: When the evaporator outlet temperature is lower than a second preset temperature, an opening instruction is sent to the fan located at the top of the evaporator to increase the heat exchange amount of the evaporator, wherein the second preset temperature is greater than the first preset temperature.

4. The method according to claim 3, characterized in that The step of adjusting the current flow rate of the hydraulic oil to the current target flow rate of the hydraulic oil includes: Calculate the target speed of the drive motor corresponding to the control of the hydraulic oil amount according to the target flow rate of the hydraulic oil; The rotation speed of the driving motor for controlling the amount of hydraulic oil is adjusted to the target rotation speed, so as to adjust the current flow rate of the hydraulic oil to the target flow rate.

5. The method according to claim 3, characterized in that The step of adjusting the current flow rate of the hydraulic oil to the current target flow rate of the hydraulic oil includes: Calculating a target angle of a hydraulic swash plate according to a target flow rate of the hydraulic oil, wherein the hydraulic swash plate angle is positively correlated with the flow rate of the hydraulic oil; The angle of the hydraulic swash plate is controlled to be adjusted to the target angle, so as to adjust the current flow rate of the hydraulic oil to the target flow rate.

6. A control system for a hydrogen refueling station, characterized in that: include: A controller, used to execute the control method of a hydrogen refueling station according to any one of claims 1 to 5; A vaporizer, used to convert the input liquid hydrogen into gaseous hydrogen; The buffer tank is used to store the gaseous hydrogen converted by the vaporizer.

7. The control system according to claim 6, characterized in that: The control system further comprises: A temperature sensor, used for collecting the temperature of the vaporizer outlet and sending the temperature of the vaporizer outlet to the controller; The pressure sensor is used to collect the pressure of the buffer tank and send the pressure of the buffer tank to the controller.

8. The control system according to claim 6, characterized in that: The control system further comprises: Liquid hydrogen storage tank, used to store liquid hydrogen; A liquid hydrogen pump is used to pump the liquid hydrogen in the liquid hydrogen storage tank into the vaporizer.

9. The control system according to claim 8, characterized in that: The liquid hydrogen pump is connected to the hydraulic oil pump through a hydraulic oil pipeline, and the hydraulic oil pump is connected to the drive motor. The greater the speed of the drive motor, the greater the hydraulic oil flow of the hydraulic oil pump, and the more liquid hydrogen the liquid hydrogen pump pumps out.

10. The control system according to claim 9, characterized in that: The control system further comprises: A frequency converter is used to control the rotation speed of the drive motor.

11. A control device for a hydrogen refueling station, used to execute the control method for a hydrogen refueling station according to any one of claims 1 to 5, characterized in that: include: An acquisition module is used to obtain the temperature of the vaporizer outlet and the buffer tank pressure during the operation of the hydrogen station; A first adjustment module is used to adjust the flow rate of the hydraulic oil according to the buffer tank pressure when the vaporizer outlet temperature is lower than the first preset temperature and the buffer tank pressure is greater than the pressure threshold corresponding to the current temperature, so that the buffer tank pressure tends to the ideal pressure value, wherein the pressure threshold corresponding to the current temperature changes dynamically with the current temperature of the buffer tank; The second adjustment module is used to adjust the flow rate of the hydraulic oil according to the vaporizer outlet temperature when the vaporizer outlet temperature is lower than the first preset temperature and the buffer tank pressure is less than or equal to the pressure threshold corresponding to the current temperature, so that the vaporizer temperature tends to an ideal temperature value.

12. A controller, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to implement the control method of the hydrogen refueling station according to any one of claims 1 to 5.

13. A computer-readable storage medium, characterized in that: When the instructions in the storage medium are executed by a processor corresponding to the controller, the controller is enabled to implement the control method of the hydrogen refueling station as described in any one of claims 1 to 5.

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