Method for online calculating hydrogen utilization rate of fuel cell system based on upper computer

Abstract

The invention discloses a method for calculating the hydrogen utilization rate of a fuel cell system on line based on an upper computer. The method comprises the steps that (1) an upper computer collects the real-time flow H2act of a hydrogen flow meter according to a preset collection period Tcyclo1; (2) if the upper computer hydrogen utilization rate calculation button switch is turned on, entering step (3), and if the upper computer hydrogen utilization rate calculation button switch is turned off, returning to step (1); (3) if the program operation cycle of the hydrogen utilization rate calculation module is larger than or equal to the preset cycle Tcycle 2, entering the step (4), and if the program operation cycle of the hydrogen utilization rate calculation module is smaller than the preset cycle Tcycle 2, returning to the step (1); and (4) the theoretical hydrogen consumption and the actual hydrogen consumption are calculated, the hydrogen utilization rate eta H2 is equal to H2contoy / H2conact * 100, and the step (1) is returned. According to the method, the hydrogen utilization rate is calculated on line in real time when the upper computer of the fuel cell system testboard is calibrated and tested.

Description

Technical Field

[0001] This invention belongs to the field of fuel cells, specifically relating to a method for calculating the hydrogen utilization rate of a fuel cell system online using a host computer. Background Technology

[0002] Fuel cell vehicles use hydrogen as fuel, generating electricity through the chemical reaction of hydrogen and oxygen to power the vehicle. Their only emission is water vapor, causing no environmental pollution. Compared to traditional gasoline-powered vehicles, fuel cell vehicles have a significant advantage in reducing greenhouse gas emissions. Currently, numerous companies and research institutions worldwide are actively investing in the development and promotion of fuel cells. In China, the government has introduced a series of policies to support the development of the fuel cell industry, achieving initial results. It is foreseeable that with policy support and continuous technological advancements, fuel cells will experience significant growth in the future.

[0003] Hydrogen utilization rate is a crucial parameter for fuel cell systems. Higher hydrogen utilization rate reduces unnecessary hydrogen waste and increases system efficiency. Besides the sealing properties of the stack materials and system piping, the opening and closing cycle of the anode hydrogen drain valve also significantly impacts hydrogen utilization. After a fuel cell prototype is developed, fuel cell system testing engineers calibrate the opening and closing times of the anode drain valve based on system characteristics to optimize and improve hydrogen utilization. However, without real-time reference to hydrogen utilization rate, the calibrated opening and closing cycle of the anode drain valve may be unreasonable, leading to excessively frequent drainage and nitrogen removal, resulting in low hydrogen utilization and wasted hydrogen.

[0004] Currently, the calculation of hydrogen utilization rate in fuel cell systems mainly relies on data saved after system operation. This involves manually calculating hydrogen utilization rates under different electrical densities from the raw data files. Then, based on the calculated hydrogen utilization rates under different electrical densities, the opening and closing cycles of the hydrogen exhaust valve are calibrated, and the calculations continue offline until the hydrogen utilization rate reaches the optimal value designed in the system. However, this method does not provide real-time online monitoring of the system's hydrogen utilization rate during operation. This results in the inability to obtain the hydrogen utilization rate corresponding to the current calibration parameters during hydrogen utilization rate calibration, making it impossible to determine whether the current parameters are optimal. For engineers, the entire hydrogen utilization rate calibration process is repetitive, tedious, and inefficient. Summary of the Invention

[0005] This invention overcomes the shortcomings of existing technologies and provides a method for online calculation of hydrogen utilization rate of a fuel cell system based on a host computer. This invention solves the problem of calculating hydrogen utilization rate online in real time on a fuel cell system test bench during calibration testing. In this invention, during hydrogen utilization rate calibration testing of the fuel cell system, relevant control quantities can be adjusted according to the real-time hydrogen utilization rate to achieve the system's expected hydrogen utilization rate, improving the efficiency of engineers in calibrating and optimizing hydrogen utilization rate and shortening calibration time.

[0006] The technical solution of this invention is as follows.

[0007] A method for calculating the hydrogen utilization rate of a fuel cell system online using a host computer includes the following steps:

[0008] 1. The host computer collects data according to the preset data acquisition cycle T. cycle1 Real-time flow rate H2 collected by hydrogen flow meter act ;

[0009] 2. If the host computer's hydrogen utilization rate calculation button is turned on, proceed to step 3. If the host computer's hydrogen utilization rate calculation button is turned off, the theoretical hydrogen consumption H2 will be calculated. con_toy =0, Actual hydrogen consumption H2 con_act =0, hydrogen utilization rate η H2 =0, return to step 1;

[0010] 3. If the running cycle of the hydrogen utilization rate calculation module is greater than or equal to the preset cycle T cycle2 Then proceed to step 4. If the running cycle of the hydrogen utilization rate calculation module program is less than the preset cycle T... cycle2 If so, return to step 1;

[0011] 4. Theoretical hydrogen consumption H2 con_toy =Fuel ​​stack output current I stack *2.016* Number of fuel cell stacks N cell / 192970*T cycle2 +H2 con_toy ;

[0012] Actual hydrogen consumption H2 con_act =H2 act *T cycle2 +H2 con_act ;

[0013] Hydrogen utilization rate η H2 =H2 con_toy / H2 con_act *100, return to step 1;

[0014] 5. The hydrogen utilization rate of the system is obtained by continuously polling and calculating for ≥3 minutes.

[0015] In some embodiments, the preset acquisition period T cycle1 The duration is 0.05~0.2S;

[0016] In some embodiments, the preset acquisition period T cycle2 The time is 0.05~0.2S.

[0017] It should be noted that the theoretical hydrogen consumption H2 in this invention is... con_toy In this formula, the unit of the fuel cell stack output current Istack is A, T. cycle2 Units: s, H2 con_toy The unit is g; the calculation process of this formula uses the values ​​of the above units for calculation, and the final value obtained is the theoretical hydrogen consumption H2. con_toy， Theoretical hydrogen consumption H2 con_toy The unit is g.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] 1. This invention can calculate hydrogen utilization rate in real time on the host computer when the fuel cell is running, reducing the redundant operations caused by offline calculation and reducing the workload of offline calculation.

[0020] 2. This invention can calculate the hydrogen utilization rate in real time on the host computer when the fuel cell is running, and provide real-time feedback to the engineer to determine the optimal value of the current calibration parameters, thereby improving the efficiency of the engineer's calibration work.

[0021] 3. This invention can be reset and recalculated at any time, which makes it convenient for engineers to change parameters and continue to read hydrogen utilization rate for calibration of anode circuit parameters of fuel cell system. Attached Figure Description

[0022] Figure 1 This is a flowchart of a method for calculating the hydrogen utilization rate of a fuel cell system online using a host computer, according to the present invention. Detailed Implementation

[0023] The technical solutions described below, in conjunction with specific illustrations, are presented to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and similar extended embodiments made by those skilled in the art without inventive effort are all within the scope of protection of this invention.

[0024] Example 1

[0025] 1. Number of fuel cell stack pieces N in a fuel cell system cell =380 pieces, operating stably at 540A current;

[0026] 2. The host computer collects data according to the preset data acquisition cycle T.cycle1 =0.1s to collect real-time flow rate H2 from hydrogen flow meter act ;

[0027] 3. The hydrogen utilization rate calculation button switch is off, and the hydrogen consumption (H2) is calculated as follows: con_toy =0, Actual hydrogen consumption H2 con_act =0, hydrogen utilization rate η H2 =0, the program returns to step 2; when it is necessary to calculate the real-time hydrogen utilization rate under this current, turn on the hydrogen utilization rate calculation button on the host computer, and the program enters step 4.

[0028] 4. The running cycle of the hydrogen utilization rate calculation module is greater than or equal to the preset cycle T. cycle2 =0.1s, then proceed to step 5. If the running cycle of the hydrogen utilization rate calculation module is less than the preset cycle T cycle2 If the value is 0.1 seconds, then return to step 1;

[0029] 5. The program calculates the theoretical hydrogen consumption (H2). con_toy =540*2.016*380 / 192970*0.1+H2 con_toy Actual hydrogen consumption H2 con_act =H2 act *0.1+H2 con_act ;

[0030] 6. The program executes and calculates the hydrogen utilization rate η. H2 =H2 con_toy / H2 con_act *100, and display the value in real time on the host computer via a display control; return to step 1;

[0031] 7. After continuously polling and calculating for 3 minutes, H2 con_toy =385.88g, H2 con_act =392.55g, at which point the hydrogen utilization rate of the system is 98.3%.

[0032] Example 2

[0033] 1. Number of fuel cell stack pieces N in a fuel cell system cell =450 pieces, operating stably at 480A current;

[0034] 2. The host computer collects data according to the preset data acquisition cycle T. cycle1 =0.1s to collect real-time flow rate H2 from hydrogen flow meter act ;

[0035] 3. If the hydrogen utilization rate calculation button switch on the host computer is turned off, the hydrogen consumption H2 con_toy =0, Actual hydrogen consumption H2 con_act =0, hydrogen utilization rate ηH2 =0, the program returns to step 2; if the hydrogen utilization rate calculation button on the host computer is turned on, the program proceeds to step 4.

[0036] 4. The running cycle of the hydrogen utilization rate calculation module is greater than or equal to the preset cycle T. cycle2 =0.1s, then proceed to step 5. If the running cycle of the hydrogen utilization rate calculation module is less than the preset cycle T cycle2 If the value is 0.1 seconds, then return to step 1;

[0037] 5. The program calculates the theoretical hydrogen consumption (H2). con_toy =480*2.016*450 / 192970*0.1+H2 con_toy Actual hydrogen consumption H2 con_act =H2 act *0.1+H2 con_act ;

[0038] 6. The program executes and calculates the hydrogen utilization rate η. H2 =H2 con_toy / H2 con_act *100, and display the value in real time on the host computer via a display control; return to step 1;

[0039] 7. After continuously polling and calculating for 3 minutes, H2 con_toy =406.19g, H2 con_act =422.23g, at which point the hydrogen utilization rate of the system is 96.2%.

[0040] Example 3

[0041] 1. Number of fuel cell stack pieces N in a fuel cell system cell =450 pieces, operating stably at 400A current;

[0042] 2. The host computer collects data according to the preset data acquisition cycle T. cycle1 =0.1s to collect real-time flow rate H2 from hydrogen flow meter act ;

[0043] 3. If the hydrogen utilization rate calculation button switch on the host computer is turned off, the hydrogen consumption H2 con_toy =0, Actual hydrogen consumption H2 con_act =0, hydrogen utilization rate η H2 =0, the program returns to step 2; if the hydrogen utilization rate calculation button on the host computer is turned on, the program proceeds to step 4.

[0044] 4. The running cycle of the hydrogen utilization rate calculation module is greater than or equal to the preset cycle T. cycle2 =0.1s, then proceed to step 5. If the running cycle of the hydrogen utilization rate calculation module is less than the preset cycle T cycle2If the value is 0.1 seconds, then return to step 1;

[0045] 5. The program calculates the theoretical hydrogen consumption (H2). con_toy =400*2.016*450 / 192970*0.1+H2 con_toy Actual hydrogen consumption H2 con_act =H2 act *0.1+H2 con_act ;

[0046] 6. The program executes and calculates the hydrogen utilization rate η. H2 =H2 con_toy / H2 con_act *100, and display the value in real time on the host computer via a display control; return to step 1;

[0047] 7. After continuously polling and calculating for 3 minutes, H2 con_toy =338.49g, H2 con_act =348.24g, at which point the hydrogen utilization rate of the system is 97.2%.

[0048] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for calculating the hydrogen utilization rate of a fuel cell system online using a host computer, characterized in that, Includes the following steps: (1) The host computer collects data according to the preset acquisition period T. cycle1 Real-time flow rate H2 collected by hydrogen flow meter act ; (2) If the host computer hydrogen utilization rate calculation button switch is turned on, proceed to step (3); if the host computer hydrogen utilization rate calculation button switch is turned off, the theoretical hydrogen consumption H2 will be calculated. con_toy =0, Actual hydrogen consumption H2 con_act =0, hydrogen utilization rate η H2 =0, return to step (1); (3) If the running cycle of the hydrogen utilization rate calculation module is greater than or equal to the preset cycle T cycle2 Then proceed to step (4). If the running cycle of the hydrogen utilization rate calculation module program is less than the preset cycle T, proceed to step (4). cycle2 If so, return to step (1); (4) Calculate the theoretical hydrogen consumption H2 con_toy And actual hydrogen consumption H2 con_act The hydrogen utilization rate η is calculated using the following formula. H2 ; Hydrogen utilization rate η H2 =H2 con_toy / H2 con_act *100, return to step (1); (5) The hydrogen utilization rate of the system is obtained by continuous polling calculation.

2. The method for calculating the hydrogen utilization rate of a fuel cell system online based on a host computer, as described in claim 1, is characterized in that... The preset acquisition period T cycle1 The time is 0.05~0.2S.

3. The method for calculating the hydrogen utilization rate of a fuel cell system online based on a host computer, as described in claim 1, is characterized in that... The preset acquisition period T cycle2 The time is 0.05~0.2S.

4. The method for calculating the hydrogen utilization rate of a fuel cell system online based on a host computer, as described in claim 1, is characterized in that... The number of individual fuel cell stacks N cell Different fuel cell stacks may have different numbers of plates; please refer to the actual number.

5. The method for calculating the hydrogen utilization rate of a fuel cell system online based on a host computer according to claim 1, characterized in that, In step (4), the theoretical hydrogen consumption H2 con_toy The following formula is used to calculate: Theoretical hydrogen consumption H2 con_toy =Fuel ​​stack output current I stack *2.016* Number of fuel cell stacks N cell / 192970*T cycle2 +H2 con_toy .

6. The method for calculating the hydrogen utilization rate of a fuel cell system online based on a host computer according to claim 1, characterized in that, In step (4), the actual hydrogen consumption H2 con_act The following formula is used to calculate: Actual hydrogen consumption H2 con_act =H2 act *T cycle2 +H2 con_act .

7. The method for calculating the hydrogen utilization rate of a fuel cell system online based on a host computer according to claim 1, characterized in that, In step (5), the time for continuous polling calculation is ≥3 min.

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