Fuel cell hydrogen circulation system off-line calibration device and off-line calibration method

Abstract

The application provides a hydrogen circulation system offline calibration device and method for a fuel cell, which comprises a hydrogen circulation system of a fuel cell to be calibrated, a hydrogen flow consumption device, a pressure sensor, a first flow meter and a controller. The first flow meter is used for measuring the hydrogen output of the hydrogen circulation system of the fuel cell to be calibrated, and the pressure sensor is used for measuring the inlet pressure of the hydrogen circulation pump of the hydrogen circulation system of the fuel cell to be calibrated. The hydrogen flow consumption device is used for simulating the hydrogen consumption. The controller calculates the hydrogen output demand, the hydrogen consumption demand and the anode inlet pressure value corresponding to each discrete current value according to the stack parameters of the fuel cell. In the calibration process, the parameter calibration value of the hydrogen circulation system under each discrete current value is obtained. The offline map can be quickly and accurately calibrated, and the calibration efficiency is effectively improved. The application is suitable for the technical field of fuel cells.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel cells, in particular, to an off-line calibration device and method for a hydrogen circulation system of a fuel cell. BACKGROUND

[0002] A sufficient amount of hydrogen is required for continuous operation of a fuel cell power generation system. A hydrogen system for a fuel cell generally includes a hydrogen supply part and a hydrogen circulation part. The hydrogen supply part is responsible for hydrogen storage and continuously providing pure hydrogen of a certain pressure and flow rate to the fuel cell stack to ensure continuous direct current generated by the reaction of oxygen in the cathode. The hydrogen circulation part includes an electromagnetic proportional valve, a hydrogen circulation pump, a hydrogen exhaust valve, and a circulation pipeline circuit. The main function of the electromagnetic proportional valve is to control the pressure at the hydrogen inlet of the fuel cell stack. The circulation pipeline circuit is used to recycle the "excess" hydrogen that has not been fully reacted in the fuel cell stack. The excess hydrogen is used to ensure that the electrochemical reaction in the fuel cell stack is fully carried out and to prevent air from penetrating into the anode to cause an explosion. The hydrogen circulation part is used to remove the water generated in the fuel cell stack and to recycle the hydrogen that has not been fully reacted. In addition, the hydrogen exhaust valve installed at the outlet of the fuel cell stack can be opened according to the control strategy to discharge the remaining exhaust gas into the atmosphere.

[0003] To ensure that the fuel cell can quickly and stably respond to the load power demand under varying conditions, the initial values are generally obtained by using numerical maps, and automatic control is performed by combining PID adjustment. Therefore, providing accurate off-line calibration maps before online testing of the fuel cell power generation system can greatly reduce the risk of online calibration and shorten the calibration time.

[0004] Referring to Figure 1 The prior art fuel cell hydrogen circulation system shown in the figure is directly calibrated online by calculating the theoretical data of the hydrogen supply amount in the hydrogen circulation system and combining the PID adjustment method. During execution, the device is first connected to an adjustable load. The upper limit opening of the electromagnetic proportional valve, the rotation speed of the hydrogen circulation pump, the opening interval and duration of the hydrogen exhaust valve are adjusted under the specified load output value until the pressure difference between the cathode, the anode, and the cooling liquid of the fuel cell stack and the working voltage difference between the individual cells meet the requirements. The relevant data is recorded, and the next working condition point is calibrated.

[0005] From the above, the existing technology for hydrogen circulation system calibration is mainly completed through online mode. In actual operation, since there is no basic reference value, the technical personnel need to adjust the electromagnetic proportional valve upper limit opening, hydrogen circulation pump speed, hydrogen discharge valve opening interval and time, and detect that the pressure difference between the cathode, anode and cooling water is not over standard, which is difficult to operate. When unstable fluctuation leads to that a certain index exceeds the normal range, if the system has a protection mechanism, it will cause shutdown, greatly increasing the calibration workload. If there is no protection mechanism, it will have damage risk, which is difficult to execute and has great risk. Moreover, this method is prone to the situation that although the calibration value meets the requirements of the current working condition point, the value is greatly different at the next working condition point, leading to that the entire calibration map is uneven and the overall efficiency is low, which seriously affects the working performance of the fuel cell system.

[0006] Therefore, the fuel cell hydrogen circulation system offline calibration device and method can realize fast and accurate offline map calibration, thereby reducing the time waste caused by repeated adjustment of calibration parameters in product development process and the energy loss and fault risk caused thereby. SUMMARY

[0007] The fuel cell hydrogen circulation system offline calibration device and method provided in the embodiments of the present application can realize fast and accurate offline map calibration and effectively improve calibration efficiency.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0009] According to a first aspect of the embodiments of the present application, a fuel cell hydrogen circulation system offline calibration device is provided, comprising: a hydrogen circulation system of a fuel cell to be calibrated, a hydrogen flow consumption device, a pressure sensor, a first flow meter and a controller; the first flow meter, the pressure sensor, the hydrogen flow consumption device and the hydrogen circulation system of the fuel cell to be calibrated are sequentially arranged on the output pipeline of the hydrogen circulation system; the first flow meter is used to measure the hydrogen output of the hydrogen circulation system of the fuel cell to be calibrated, and the pressure sensor is used to measure the inlet pressure of the hydrogen circulation pump of the hydrogen circulation system of the fuel cell to be calibrated; the hydrogen flow consumption device is used to simulate hydrogen consumption; the controller is used to calculate the hydrogen output demand, hydrogen consumption demand and anode inlet pressure value corresponding to each discrete current value according to the stack parameters of the battery; and according to the hydrogen output demand, hydrogen consumption demand and anode inlet pressure value under each discrete current value, the parameter calibration value of the hydrogen circulation system under each discrete current value is obtained by adjusting the control components of the hydrogen circulation system and the control components of the hydrogen flow consumption device under the condition that the hydrogen output demand is consistent with the hydrogen output, the hydrogen consumption demand is consistent with the hydrogen output, and the measured value of the pressure sensor is consistent with the anode inlet pressure value.

[0010] Preferably, the off-line calibration device further comprises a tail exhaust sensor arranged at the end of the output pipeline, and an output end of the tail exhaust sensor is connected to an input end of the controller.

[0011] Preferably, the hydrogen circulation system comprises a gas source, a solenoid valve, a solenoid proportional valve, a hydrogen circulation pump, a hydrogen exhaust solenoid valve and a hydrogen circulation pump controller; the solenoid valve, the solenoid proportional valve, a first flow meter, a pressure sensor, a three-way valve and the hydrogen exhaust solenoid valve are arranged in sequence on an output pipeline of the gas source; a first circulation branch pipe is connected to a pipeline between a first output port of the three-way valve and the hydrogen exhaust solenoid valve, and a second circulation branch pipe is connected to a pipeline between the first flow meter and the pressure sensor; an air inlet of the hydrogen circulation pump is connected to the first circulation branch pipe, and an air outlet of the hydrogen circulation pump is connected to the first circulation branch pipe; a second output port of the three-way valve is connected to a hydrogen exhaust pipeline, and a back pressure valve and a second flow meter are arranged in sequence on the hydrogen exhaust pipeline; signal output ends of the first flow meter, the pressure sensor, a tail exhaust sensor and the second flow meter are connected to input ends of the controller respectively; output ends of the controller are connected to control ends of the solenoid valve, the solenoid proportional valve, the hydrogen exhaust solenoid valve, the back pressure valve and the hydrogen circulation pump controller, and an output end of the hydrogen circulation pump controller is connected to the hydrogen circulation pump.

[0012] Preferably, in the off-line calibration process, the gas output by the gas source is helium.

[0013] According to a second aspect of the embodiments of the present application, a hydrogen circulation system off-line calibration method for fuel cells is provided, comprising the following steps:

[0014] In step S10, a first flow meter measures a hydrogen output of a hydrogen circulation system of a fuel cell to be calibrated; a pressure sensor measures an inlet pressure of a hydrogen circulation pump of the fuel cell to be calibrated; and a hydrogen flow consumption device simulates a hydrogen consumption.

[0015] In step S20, the hydrogen output, the inlet pressure of the hydrogen circulation pump and the hydrogen consumption are sent to a controller.

[0016] In step S30, the controller calculates a hydrogen output demand, a hydrogen consumption demand and a hydrogen surplus corresponding to each discrete current value according to stack parameters of the fuel cell.

[0017] According to the hydrogen output demand, the hydrogen consumption demand, and the anode inlet pressure value at each discrete current value, the control components of the hydrogen circulation system and the control components of the hydrogen flow consumption device are adjusted, so that the hydrogen output demand is consistent with the hydrogen output, the hydrogen consumption demand is consistent with the hydrogen output, and the measured value of the pressure sensor is consistent with the anode inlet pressure value, thereby obtaining the parameter calibration value of the hydrogen circulation system at each discrete current value.

[0018] Preferably, the step S30 comprises:

[0019] In step S301, the hydrogen output demand Q i , the hydrogen consumption demand Q c , and the hydrogen remaining amount Q s corresponding to each discrete current value are calculated according to the stack parameters of the battery.

[0020] In step S302, the opening interval and the opening duration of the hydrogen discharge electromagnetic valve are set at a specified discrete current value, and the opening degree of the electromagnetic proportional valve is controlled according to the measured value of the first flowmeter of the hydrogen circulation system, so as to obtain a specified hydrogen output.

[0021] The opening degree of the back pressure valve is controlled according to the measured value of the second flowmeter of the hydrogen flow consumption device, so as to obtain a specified hydrogen consumption.

[0022] The speed of the hydrogen circulation pump and the opening degree of the electromagnetic proportional valve are adjusted according to the measured value of the pressure sensor of the hydrogen circulation system, so as to obtain a specified pressure at the anode inlet, and the corresponding speed n i of the hydrogen circulation pump and the opening degree k i of the electromagnetic proportional valve are recorded.

[0023] In step S303, the opening interval and the opening duration of the hydrogen discharge electromagnetic valve are adjusted with the speed n i of the hydrogen circulation pump and the opening degree k i of the electromagnetic proportional valve as initial values, so as to obtain the lower limit value of the opening interval and the upper limit value of the opening duration of the hydrogen discharge electromagnetic valve.

[0024] Steps S302-S303 are repeatedly executed to complete the working condition calibration at all discrete current values.

[0025] Preferably, the step S302 comprises:

[0026] In step S3021, the opening interval of the hydrogen discharge electromagnetic valve is set as x i (s), and the opening duration is set as y i (s).

[0027] Step S3022, according to the measured value of the first flowmeter, slowly adjust the opening of the electromagnetic proportional valve, so that the measured value F a of the first flowmeter is within the range of the required amount of hydrogen flow Q i (He).

[0028] |F a ﹣Q i (He)|≤α i ;

[0029] Step S3023, open the hydrogen flow consumption device, according to the measured value of the second flowmeter, adjust the opening of the back pressure valve, so that the measured value F b of the second flowmeter is within the range of the required amount of hydrogen consumption Q c (He).

[0030] |F b ﹣Q c (He)|≤β i ;

[0031] Step S3024, close the back pressure valve, according to the measured value of the pressure sensor, adjust the speed of the hydrogen circulating pump, so that the measured value p of the pressure sensor is within the range of the pressure value p i at the anode inlet.

[0032] |p﹣p i |≤γ i ;

[0033] Step S3025, according to the measured value F a of the first flowmeter and the measured value p of the pressure sensor, fine-tune the opening of the electromagnetic proportional valve and the speed of the hydrogen circulating pump, so that:

[0034] |F a ﹣Q i (He)|≤α i and |p﹣p i |≤γ i ;

[0035] Record the speed n i of the hydrogen circulating pump and the opening k i of the electromagnetic proportional valve.

[0036] Where x i (s), y i (s) are artificial experience parameters, and α, β, γ are the error range allowed by the user in the calibration process.

[0037] Preferably, the step S303 comprises:

[0038] Step S3031, set the upper limit opening of the electromagnetic proportional valve to ki , the hydrogen circulation pump rotation speed value is n i ;

[0039] Step S3032, set the opening duration as y i , sequentially reduce the opening interval by a specified step, when the measured value p of the pressure sensor and the pressure value p i at the anode inlet satisfy the relationship: |p-p i |≥δi, record the opening interval x at this time i ;

[0040] Step S3033, keep the opening interval as x i , sequentially increase the opening duration by a specified step, when the measured value p of the pressure sensor and the pressure value p i at the anode inlet satisfy the relationship: |p-p i |≥δi, record the opening duration y at this time i ;

[0041] Wherein, δ is the error range allowed by the user in the calibration process.

[0042] According to a third aspect of the embodiments of the present application, an electronic device is provided, comprising:

[0043] a memory;

[0044] a processor; and

[0045] a computer program;

[0046] Wherein, the computer program is stored in the memory and is configured to be executed by the processor to implement the method as claimed in any one of the above.

[0047] According to a fourth aspect of the embodiments of the present application, a computer readable storage device is provided, characterized in that a computer program is stored thereon; the computer program is executed by a processor to implement the method as claimed in any one of the above.

[0048] The fuel cell hydrogen circulation system offline calibration device and offline calibration method provided in the embodiments of the present application have the following technical effects compared with the prior art:

[0049] 1、In the present application, the first flow meter can measure the hydrogen output of the hydrogen circulation system of the fuel cell to be calibrated, the pressure sensor can measure the inlet pressure of the hydrogen circulation pump of the hydrogen circulation system of the fuel cell to be calibrated, and the hydrogen flow consumption device can simulate the hydrogen consumption; the controller calculates the hydrogen output demand and hydrogen consumption demand corresponding to each discrete current value according to the stack parameters of the battery; during the offline calibration process:

[0050] The controller adjusts the control components (valves, pumps) of the hydrogen circulation system according to the hydrogen output demand and the hydrogen consumption demand at each discrete current value, so that the hydrogen output quantity is consistent with the hydrogen output demand, and the hydrogen consumption quantity is consistent with the hydrogen consumption demand; according to the measurement value of the pressure sensor, the control components (valves, pumps) of the hydrogen circulation system are fine-tuned, so that the measurement value of the pressure sensor is consistent with the anode inlet pressure value; and the parameter calibration value of the control components of the hydrogen circulation system is recorded when the above conditions are met, thereby completing the offline calibration of the hydrogen circulation system.

[0051] The present application can realize offline calibration of the hydrogen circulation system for fuel cells, and compared with the online calibration of the prior art, can ensure rapid and accurate offline map calibration in the full operating condition range, effectively improve the calibration efficiency, and has high practicability.

[0052] 2. In the present application, the hydrogen circulation pump speed and the electromagnetic proportional valve opening degree can be adjusted for each discrete current value to meet the flow and pressure requirements, thereby laying a foundation for formulating an excellent final map for online calibration.

[0053] 3. In the present application, the lower limit value of the hydrogen discharge electromagnetic valve opening interval and the upper limit value of the hydrogen discharge electromagnetic valve opening duration can be obtained according to the change of the anode inlet pressure value, thereby providing effective reference values for the online calibration process, reducing the workload of online calibration, and effectively improving the safety of online calibration. BRIEF DESCRIPTION OF DRAWINGS

[0054] The accompanying drawings, which are included to provide a further understanding of the present application, constitute a part of the present application and illustrate the illustrative embodiments of the present application and their description serve to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0055] Figure 1 It is a structural schematic diagram of the fuel cell hydrogen circulation system in the prior art.

[0056] Figure 2 It is a circuit structure schematic diagram of the fuel cell hydrogen circulation system offline calibration device provided by the present application.

[0057] Figure 3 It is a structural schematic diagram of the fuel cell hydrogen circulation system offline calibration device provided by the present application.

[0058] Figure 4 It is a flowchart of the fuel cell hydrogen circulation system offline calibration method provided by the present application.

[0059] Figure 5A flowchart of step S30 in the off-line calibration method of the hydrogen circulation system for fuel cells provided in the present application is shown in the figure;

[0060] The figures are marked as follows:

[0061] 10 is a hydrogen circulation system, 20 is a hydrogen flow consumption device, 30 is a pressure sensor, 40 is a first flow meter, 50 is a tail exhaust sensor, and 60 is a controller;

[0062] 101 is a gas source, 102 is a solenoid valve, 103 is a solenoid proportional valve, 104 is a hydrogen circulation pump, 105 is a hydrogen exhaust solenoid valve, and 106 is a hydrogen circulation pump controller;

[0063] 201 is a three-way valve, 202 is a back pressure valve, and 203 is a second flow meter. DETAILED DESCRIPTION

[0064] The embodiments of the present application disclose an off-line calibration device and method of a hydrogen circulation system for fuel cells, to solve the problem of low calibration efficiency of the existing fuel cell hydrogen circulation system.

[0065] In order to make the technical solutions and advantages in the embodiments of the present application clearer, the exemplary embodiments of the present application are further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0066] Please refer to Figure 2 In a specific embodiment, the off-line calibration device of the hydrogen circulation system for fuel cells comprises: a hydrogen circulation system 10 of a fuel cell to be calibrated, a hydrogen flow consumption device 20, a pressure sensor 30, a first flow meter 40, and a controller 60.

[0067] The first flow meter 40, the pressure sensor 30, the hydrogen flow consumption device 20, and the like are sequentially arranged on the output pipeline of the hydrogen circulation system 10 of the fuel cell to be calibrated.

[0068] The first flow meter 40 is used to measure the hydrogen output of the hydrogen circulation system 10 of the fuel cell to be calibrated, the pressure sensor 30 is used to measure the inlet pressure of the hydrogen circulation pump 104 of the hydrogen circulation system 10 of the fuel cell to be calibrated, and the hydrogen flow consumption device 20 is used to simulate a hydrogen consumption device.

[0069] The controller 60 is used to calculate the hydrogen output demand and the hydrogen consumption demand corresponding to each discrete current value according to the stack parameters of the battery.

[0070] According to the hydrogen output demand, the hydrogen consumption demand and the anode inlet pressure value at each discrete current value, the parameter calibration value of the hydrogen circulation system 10 at each discrete current value is obtained by adjusting the control components of the hydrogen circulation system 10 and the control components of the hydrogen flow consumption device 20, under the condition that the hydrogen output demand is consistent with the hydrogen output, the hydrogen consumption demand is consistent with the hydrogen output, and the measured value of the pressure sensor 30 is consistent with the anode inlet pressure value.

[0071] In the embodiment, the first flow meter can measure the hydrogen output of the hydrogen circulation system of the fuel cell to be calibrated, the pressure sensor can measure the inlet pressure of the hydrogen circulation pump of the hydrogen circulation system of the fuel cell to be calibrated, the hydrogen flow consumption device can simulate the hydrogen consumption, and the controller can calculate the hydrogen output demand and the hydrogen consumption demand corresponding to each discrete current value according to the stack parameters of the fuel cell.

[0072] According to the hydrogen output demand and the hydrogen consumption demand at each discrete current value, the controller adjusts the control components (valves and pumps) of the hydrogen circulation system to make the hydrogen output consistent with the hydrogen output demand, adjusts the control components of the hydrogen flow consumption device to make the hydrogen consumption consistent with the hydrogen consumption demand, and adjusts the control components (valves and pumps) of the hydrogen circulation system according to the measured value of the pressure sensor to make the measured value of the pressure sensor consistent with the anode inlet pressure value, and records the parameter calibration value of the control components of the hydrogen circulation system under the above conditions, thereby completing the offline calibration of the hydrogen circulation system.

[0073] The present application can realize the offline calibration of the hydrogen circulation system for fuel cells, and can ensure the rapid and accurate calibration of the offline map in the full operating condition range, effectively improve the calibration efficiency, and has high practicability compared with the online calibration of the prior art.

[0074] Please refer to Figure 3 The offline calibration device further comprises a tail emission sensor 50 arranged at the end of the output pipeline, and the output end of the tail emission sensor 50 is connected to the input end of the controller 60.

[0075] Specifically, the hydrogen circulation system 10 comprises a gas source 101, an electromagnetic valve 102, an electromagnetic proportional valve 103, a hydrogen circulation pump 104, a hydrogen discharge electromagnetic valve 105, and a hydrogen circulation pump controller 106; the hydrogen flow consumption device 20 comprises a three-way valve 201, a back pressure valve 202, and a second flow meter 203; the electromagnetic valve 102, the electromagnetic proportional valve 103, the first flow meter 40, the pressure sensor 30, the three-way valve 201, and the hydrogen discharge electromagnetic valve 105 are sequentially arranged on the output pipeline of the gas source 101; a first circulation branch pipe is connected to the pipeline between the first output port of the three-way valve 201 and the hydrogen discharge electromagnetic valve 105, and a second circulation branch pipe is connected to the pipeline between the first flow meter 40 and the pressure sensor 30; the first circulation branch pipe is connected to the gas inlet of the hydrogen circulation pump 104, and the first circulation branch pipe is connected to the gas outlet of the hydrogen circulation pump 104; the second output port of the three-way valve 201 is connected to the hydrogen discharge pipeline, and the back pressure valve 202 and the second flow meter 203 are sequentially arranged on the hydrogen discharge pipeline; the signal output end of the first flow meter 40, the signal output end of the pressure sensor 30, the signal output end of the tail discharge sensor 50, and the signal output end of the second flow meter 203 are connected to the input end of the controller 60; the output end of the controller 60 is connected to the control end of the electromagnetic valve 102, the control end of the electromagnetic proportional valve 103, the control end of the hydrogen discharge electromagnetic valve 105, the control end of the back pressure valve 202, and the control end of the hydrogen circulation pump controller 106, and the output end of the hydrogen circulation pump controller 106 is connected to the hydrogen circulation pump 104.

[0076] In this embodiment, the gas source 101, the electromagnetic valve 102, the electromagnetic proportional valve 103, the hydrogen circulation pump 104, the hydrogen discharge electromagnetic valve 105, and the like are all provided by the hydrogen circulation system 10 of the fuel cell to be calibrated, so that the obtained offline map is targeted.

[0077] In this embodiment, the hydrogen flow consumption device 20 comprises the three-way valve 201, the back pressure valve 202, and the second flow meter 203; since there is no consumption device of the fuel cell in the offline process, the hydrogen flow consumption device can simulate the hydrogen consumption process of the fuel cell system during power generation.

[0078] In this embodiment, the parameters of the hydrogen circulation system 10 include the opening of the electromagnetic proportional valve 103 and the rotating speed of the hydrogen circulation pump 104, and in the offline calibration process:

[0079] The measured value of the first flow meter is used to control the opening of the electromagnetic proportional valve to obtain a specified hydrogen output; the measured value of the second flow meter is used to control the opening of the back pressure valve to obtain a specified hydrogen consumption; and on the basis of reaching the above conditions, the speed of the hydrogen circulating pump and the opening of the electromagnetic proportional valve are adjusted according to the measured value of the pressure sensor to obtain a specified pressure at the anode inlet; and the corresponding speed n of the hydrogen circulating pump when the specified pressure at the anode inlet is recorded i and the opening k of the electromagnetic proportional valve i ; then, the opening interval and the opening duration of the hydrogen discharge electromagnetic valve are adjusted respectively with the speed n of the hydrogen circulating pump i and the opening k of the electromagnetic proportional valve i as initial values to obtain a lower limit value of the opening interval of the hydrogen discharge electromagnetic valve and an upper limit value of the opening duration of the hydrogen discharge electromagnetic valve; and the working condition calibration under all discrete current values is completed.

[0080] Further, in the offline calibration process, the gas source 101 outputs helium gas; in this embodiment, in order to ensure the safety of the calibration process, helium gas with a relative molecular mass close to that of hydrogen is used instead of hydrogen,

[0081] In addition, the application also provides an offline calibration method for a hydrogen circulating system of a fuel cell.

[0082] Referring to Figure 4 , the offline calibration method for the hydrogen circulating system of the fuel cell comprises the following steps:

[0083] In step S10, a first flow meter measures the hydrogen output of the hydrogen circulating system of the fuel cell to be calibrated; a pressure sensor measures the inlet pressure of the hydrogen circulating pump of the hydrogen circulating system of the fuel cell to be calibrated; and a hydrogen flow consumption device simulates the hydrogen consumption.

[0084] In step S20, the hydrogen output, the inlet pressure of the hydrogen circulating pump and the hydrogen consumption are sent to a controller.

[0085] In step S30, the controller calculates the hydrogen output demand, the hydrogen consumption demand and the hydrogen remaining amount corresponding to each discrete current value according to the stack parameters of the fuel cell.

[0086] According to the hydrogen output demand, the hydrogen consumption demand and the anode inlet pressure value under each discrete current value, the parameter calibration values of the hydrogen circulating system under each discrete current value are obtained by adjusting the control components of the hydrogen circulating system and the control components of the hydrogen flow consumption device under the conditions that the hydrogen output demand is consistent with the hydrogen output, the hydrogen consumption demand is consistent with the hydrogen output and the measured value of the pressure sensor is consistent with the anode inlet pressure value.

[0087] In the embodiment, the step S30, the controller calculates the hydrogen output demand, hydrogen consumption demand and hydrogen surplus corresponding to each discrete current value according to the stack parameters of the battery; wherein:

[0088] Each discrete current value can adopt the discrete value given in the current-performance parameter table provided by the stack manufacturer, or multiple discrete current values containing maximum and minimum values can be selected from the current-performance curve diagram provided by the manufacturer, and the number is m.

[0089] The calculation of the hydrogen output demand corresponding to different discrete current values is shown in formula (1):

[0090]

[0091] Wherein: W H2 is the required hydrogen mass flow, unit g / s; λ ca is the excess hydrogen coefficient, provided by the manufacturer; N fc is the number of single units in the stack, provided by the manufacturer; M H2 is the molar mass of hydrogen; F is the Faraday constant; I i is the discrete current value;

[0092] In the embodiment, in order to ensure the safety of the calibration process, the gas used in the calibration process is helium (the relationship between mass flow and volume flow is: W=ρQ; the conversion formula between the volume flow of hydrogen and helium is:

[0093] When calibrating at room temperature, the corresponding temperature correction coefficient needs to be multiplied Wherein, T' is the specified inlet gas temperature of the fuel cell;

[0094] Therefore, the calculation of the helium mass flow value is shown in formula (2):

[0095]

[0096] Please refer to Figure 5 , specifically, the step S30 comprises:

[0097] Step S301, according to the stack parameters of the battery, calculate the hydrogen output demand Q i , hydrogen consumption demand Q c and hydrogen surplus Q s corresponding to each discrete current value;

[0098] Step S302, under the specified discrete current value, set the opening interval and opening time length of the hydrogen discharge electromagnetic valve, and according to the measurement value of the first flow meter of the hydrogen circulation system, control the opening degree of the electromagnetic proportional valve to obtain the specified hydrogen output;

[0099] and according to the measured value of the second flow meter of the hydrogen flow consumption device, the opening of the back pressure valve is controlled to obtain the specified hydrogen consumption amount;

[0100] and according to the measured value of the pressure sensor of the hydrogen circulation system, the rotating speed of the hydrogen circulation pump and the opening of the electromagnetic proportional valve are adjusted to obtain the specified pressure at the anode inlet, and when the specified pressure at the anode inlet is recorded, the corresponding rotating speed n of the hydrogen circulation pump is recorded i and the opening k of the electromagnetic proportional valve i ;

[0101] Step S303, the opening interval and the opening duration of the hydrogen discharge electromagnetic valve are respectively adjusted with the rotating speed n of the hydrogen circulation pump i and the opening k of the electromagnetic proportional valve i as initial values, to obtain the lower limit value of the opening interval of the hydrogen discharge electromagnetic valve and the upper limit value of the opening duration of the hydrogen discharge electromagnetic valve;

[0102] Steps S302-S303 are executed cyclically to complete the working condition calibration under all discrete current values.

[0103] Further, the step S302 comprises:

[0104] Step S3021, the opening interval of the hydrogen discharge electromagnetic valve is set as x i (s), and the opening duration is set as y i (s);

[0105] Step S3022, according to the measured value of the first flow meter, the opening of the electromagnetic proportional valve is slowly adjusted, so that the measured value F a of the first flow meter and the hydrogen flow demand Q i (He) satisfy the following relationship:

[0106] |F a ﹣Q i (He)|≤α i ;

[0107] Step S3023, the hydrogen flow consumption device is started, and according to the measured value of the second flow meter, the opening of the back pressure valve is adjusted, so that the measured value F b of the second flow meter and the hydrogen consumption demand Q c (He) satisfy the following relationship:

[0108] |F b ﹣Q c (He)|≤β i ;

[0109] Step S3024, the back pressure valve is closed, and according to the measured value of the pressure sensor, the rotating speed of the hydrogen circulation pump is adjusted, so that the measured value p of the pressure sensor and the pressure value p at the anode inlet satisfy the following relationship:i The relationship is:

[0110] |p﹣p i |≤γ i ;

[0111] Step S3025, based on the measured value F of the first flow meter a The pressure sensor's measured value p is used to fine-tune the opening of the electromagnetic proportional valve and the speed of the hydrogen circulation pump to meet the following requirements:

[0112] |F a -Q i (He)|≤α i And |p﹣p i |≤γ i ;

[0113] Record the rotational speed n of the hydrogen circulation pump. i and the opening degree k of the electromagnetic proportional valve i ;

[0114] Where, x i (s), y i (s) represents human experience parameters, and α, β, and γ represent the error range allowed by the user during the calibration process.

[0115] Through step S302, at a specified discrete current value, the parameter calibration values ​​of the upper limit opening of the electromagnetic proportional valve and the speed of the hydrogen circulation pump can be obtained.

[0116] Furthermore, step S303 includes:

[0117] Step S3031: Under the specified discrete current value, set the upper limit opening degree of the electromagnetic proportional valve to k. i The hydrogen circulation pump speed is n i ;

[0118] Step S3032, set the activation duration to y i The opening interval is decreased sequentially in specified steps until the pressure sensor's measured value p equals the pressure value p at the anode inlet. i The relationship is: |p﹣p i When |≥δi, record the opening interval as x. i ;

[0119] Step S3033, maintain the opening interval at x i The opening time is increased sequentially in specified steps until the pressure sensor's measured value p equals the pressure value p at the anode inlet. i The relationship is: |p﹣p i When |≥δi, record the duration y of the operation at this time. i ;

[0120] wherein, δ is the error range allowed by the user in the calibration process.

[0121] In this embodiment, the specified step length is 1s.

[0122] By the step S303, when the specified discrete current value is obtained, the lower limit value of the opening interval of the hydrogen exhaust electromagnetic valve, the upper limit value of the opening duration of the hydrogen exhaust electromagnetic valve, the parameter calibration value of the opening interval of the hydrogen exhaust electromagnetic valve and the opening duration of the hydrogen exhaust electromagnetic valve are obtained.

[0123] In this application, the offline calibration method and the offline calibration device are based on the same inventive concept, and since the principles of solving problems are similar, the implementation of the offline calibration method and the offline calibration device can be referred to each other, and the repeated parts will not be described.

[0124] The application also provides an electronic device, comprising:

[0125] a memory;

[0126] a processor; and

[0127] a computer program;

[0128] The computer program is stored in the memory and is configured to be executed by the processor to implement the method as described above.

[0129] The application also provides a computer readable storage medium having a computer program stored thereon; the computer program is executed by a processor to implement the method as described above.

[0130] In summary, the application provides a hydrogen circulation system offline calibration device and offline calibration method for fuel cells, which can realize rapid and accurate offline map calibration, and the reference map obtained by the application can be directly written into the system control software as the fuel cell working condition architecture, reducing the time for repeatedly adjusting calibration parameters in the product development process and the energy loss and fault risk caused thereby, and having strong practicability.

[0131] Those skilled in the art will understand that embodiments of the application can be provided as methods, systems, or computer program products. Therefore, the application can be in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0132] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0133] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0134] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 means for functionally implementing the steps listed in the flowchart block or blocks.

[0135] While the preferred embodiments of the application have been described, additional variations and modifications can be employed by those skilled in the art. Therefore, the appended claims intend to cover all such modifications and variations as fall within the true spirit and scope of the application.

[0136] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. An off-line calibration device for a hydrogen circulation system for a fuel cell, characterized by include: The hydrogen circulation system (10), hydrogen flow consumption device (20), pressure sensor (30), first flow meter (40) and controller (60) of the fuel cell to be calibrated. The first flow meter (40), pressure sensor (30), and hydrogen flow consumption device (20) are sequentially installed on the output pipeline of the hydrogen circulation system (10) of the fuel cell to be calibrated; The first flow meter (40) is used to measure the hydrogen output of the hydrogen circulation system (10) of the fuel cell to be calibrated; the pressure sensor (30) is used to measure the inlet pressure of the hydrogen circulation pump (104) of the hydrogen circulation system (10) of the fuel cell to be calibrated; and the hydrogen flow consumption device (20) is used to simulate the hydrogen consumption. The controller (60) is used to calculate the hydrogen output demand, hydrogen consumption demand and anode inlet pressure value corresponding to each discrete current value based on the battery stack parameters. Based on the hydrogen output demand, hydrogen consumption demand, and anode inlet pressure value under each discrete current value, the control components of the hydrogen circulation system (10) and the control components of the hydrogen flow consumption device (20) are adjusted to obtain the parameter calibration values ​​of the hydrogen circulation system (10) under each discrete current value, under the conditions that the hydrogen output demand is consistent with the hydrogen output, the hydrogen consumption demand is consistent with the hydrogen output, and the measured value of the pressure sensor (30) is consistent with the anode inlet pressure value. The controller adjusts the control components of the hydrogen circulation system according to the hydrogen output demand and hydrogen consumption demand under each discrete current value, so that the hydrogen output is consistent with the hydrogen output demand. By adjusting the control components of the hydrogen flow consumption device, the hydrogen consumption can be made consistent with the hydrogen consumption demand. Based on the pressure sensor readings, the control components of the hydrogen circulation system are fine-tuned to ensure that the pressure sensor readings match the anode inlet pressure. The calibration values ​​of the control components of the hydrogen circulation system are recorded when all of the above conditions are met, thus completing the offline calibration of the hydrogen circulation system.

2. The apparatus according to claim 1, wherein The offline calibration device further includes a tailpipe sensor (50) located at the end of the output pipeline, the output end of which is connected to the input end of the controller (60).

3. The apparatus according to claim 1, wherein The hydrogen circulation system (10) includes: a gas source (101), a solenoid valve (102), a solenoid proportional valve (103), a hydrogen circulation pump (104), a hydrogen discharge solenoid valve (105), and a hydrogen circulation pump controller (106). The solenoid valve (102), solenoid proportional valve (103), first flow meter (40), pressure sensor (30), three-way valve (201), and hydrogen discharge solenoid valve (105) are sequentially arranged on the output pipeline of the gas source (101); The first output port of the three-way valve (201) is connected with the first circulation branch pipe between the hydrogen discharge electromagnetic valve (105), and the second circulation branch pipe is connected between the first flow meter (40) and the pressure sensor (30); the first circulation branch pipe is connected with the gas inlet of the hydrogen circulation pump (104), and the first circulation branch pipe is connected with the gas outlet of the hydrogen circulation pump (104); The second output port of the three-way valve (201) is connected with the hydrogen discharge pipeline, and the back pressure valve (202) and the second flow meter (203) are sequentially arranged on the hydrogen discharge pipeline; The signal output ends of the first flow meter (40), the pressure sensor (30), the tail discharge sensor (50) and the second flow meter (203) are connected with the input end of the controller (60) respectively; The output end of the controller (60) is connected with the control end of the electromagnetic valve (102), the control end of the electromagnetic proportional valve (103), the control end of the hydrogen discharge electromagnetic valve (105), the control end of the back pressure valve (202) and the control end of the hydrogen circulation pump controller (106), and the output end of the hydrogen circulation pump controller (106) is connected with the hydrogen circulation pump (104).

4. The apparatus according to claim 3, wherein In the offline calibration process, the gas output by the gas source (101) is helium.

5. A method for off-line calibration of a hydrogen circulation system for a fuel cell, characterized by, The method comprises the following steps: Step S10, the first flow meter measures the hydrogen output of the hydrogen circulation system of the fuel cell to be calibrated; The pressure sensor measures the inlet pressure of the hydrogen circulation pump of the hydrogen circulation system of the fuel cell to be calibrated; and the hydrogen flow consumption device simulates the hydrogen consumption amount; Step S20, the hydrogen output, the inlet pressure of the hydrogen circulation pump and the hydrogen consumption amount are sent to the controller; Step S30, the controller calculates the hydrogen output demand, the hydrogen consumption demand and the hydrogen remaining amount corresponding to each discrete current value according to the stack parameters of the fuel cell; According to the hydrogen output demand, the hydrogen consumption demand and the anode inlet pressure value under each discrete current value, the parameter calibration value of the hydrogen circulation system under each discrete current value is obtained by adjusting the control components of the hydrogen circulation system and the control components of the hydrogen flow consumption device under the condition that the hydrogen output demand is consistent with the hydrogen output, the hydrogen consumption demand is consistent with the hydrogen output and the measurement value of the pressure sensor is consistent with the anode inlet pressure value; The controller adjusts the control components of the hydrogen circulation system to make the hydrogen output consistent with the hydrogen output demand according to the hydrogen output demand and the hydrogen consumption demand under each discrete current value; The control components of the hydrogen flow consumption device are adjusted to make the hydrogen consumption consistent with the hydrogen consumption demand; According to the measurement value of the pressure sensor, the control components of the hydrogen circulation system are finely adjusted to make the measurement value of the pressure sensor consistent with the anode inlet pressure value; and the parameter calibration value of the control components of the hydrogen circulation system under the condition that the above conditions are met is recorded, and the offline calibration of the hydrogen circulation system is completed.

6. The method of claim 5, wherein, The step S30 comprises: Step S301, according to the stack parameters of the battery, the hydrogen output demand Q corresponding to each discrete current value is calculated i , the hydrogen consumption demand Q c , and the hydrogen remaining amount Q s ; Step S302, set the opening interval and opening duration of the hydrogen exhaust electromagnetic valve at the specified discrete current value, and control the opening of the electromagnetic proportional valve according to the measurement value of the first flowmeter of the hydrogen circulation system to obtain the specified hydrogen output; and control the opening of the back pressure valve according to the measurement value of the second flowmeter of the hydrogen flow consumption device to obtain the specified hydrogen consumption; and according to the measured value of the pressure sensor of the hydrogen circulation system, adjusting the rotating speed of the hydrogen circulation pump and the opening of the electromagnetic proportional valve to obtain the specified pressure at the anode inlet, and recording the rotating speed of the hydrogen circulation pump corresponding to the specified pressure at the anode inlet and the opening of the electromagnetic proportional valve ; Step S303, the rotation speed of the hydrogen circulation pump and the opening of the electromagnetic proportional valve As initial values, the opening interval and the opening duration of the hydrogen discharge electromagnetic valve are adjusted respectively to obtain the lower limit value of the opening interval of the hydrogen discharge electromagnetic valve and the upper limit value of the opening duration of the hydrogen discharge electromagnetic valve; Steps S302-S303 are executed in a loop to complete the working condition calibration at all discrete current values.

7. The method of claim 6, wherein, The step S302 comprises: Step S3021, the opening interval of the hydrogen discharge electromagnetic valve is set as , and the opening duration is set as ; Step S3022, according to the measured value of the first flowmeter, slowly adjust the opening of the electromagnetic proportional valve, so that the measured value of the first flowmeter is proportional to the hydrogen flow demand . ； Step S3023, open the hydrogen flow consumption device, according to the measured value of the second flow meter, adjust the opening of the back pressure valve, so that the measured value of the second flow meter is proportional to the hydrogen consumption demand . ； Step S3024, the back pressure valve is closed, according to the measured value of the pressure sensor, the rotating speed of the hydrogen circulation pump is adjusted, so that the relationship between the measured value p of the pressure sensor and the pressure value at the anode inlet is: ​ ； Step S3025, based on the measured value of the first flowmeter , the measured value p of the pressure sensor, the opening of the electromagnetic proportional valve and the rotation speed of the hydrogen circulation pump, so as to satisfy and ; Recording the rotational speed of a hydrogen circulation pump and the opening of an electromagnetic proportional valve ; wherein, , are artificial experience parameters, and a, b, g are the error range allowed by the user in the calibration process.

8. The method of claim 6, wherein, The step S303 comprises: Step S3031, at the specified discrete current value, set the upper limit opening degree of the electromagnetic proportional valve to , and the hydrogen circulation pump rotation speed value to ; Step S3032, set the opening duration as , and sequentially reduce the opening interval with a specified step size. When the relationship between the measured value p of the pressure sensor and the pressure value at the anode inlet is , record the opening interval at this time as ; and . Step S3033, keep the opening interval as , sequentially increase the opening duration with a specified step, and when the relationship between the measured value p of the pressure sensor and the pressure value at the anode inlet is , record the opening duration at this time . ; Wherein, δ is the error range allowed by the user during calibration.

9. An electronic device, comprising: Comprise: A memory; A processor; And A computer program; Wherein, the computer program is stored in the memory and is configured to be executed by the processor to implement the method of any one of claims 5 to 8.

10. A computer-readable storage device, comprising: Having a computer program stored thereon; the computer program is executed by the processor to implement the method of any one of claims 5 to 8.

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