Methods, devices and vehicles for determining opening degree

Abstract

This application relates to a method, apparatus, and vehicle for determining the opening degree, and pertains to the field of battery technology, at least addressing the technical problem of compressor surge in related technologies. The method includes: acquiring reaction demand information of the fuel cell after the hydrogen chamber of the fuel cell has been vented, the reaction demand information indicating the gas parameters required for the fuel cell to convert chemical energy into electrical energy; wherein, during the venting of the hydrogen chamber, the fuel cell's outflow valve is closed, and the bypass throttle valve is open; based on the reaction demand information, adjusting the outflow valve from the closed state to a first target opening degree, and adjusting the bypass throttle valve's opening degree to a second target opening degree, the opening degree of the outflow valve being used to adjust the gas flow rate of the outflow valve, and the opening degree of the bypass throttle valve being used to adjust the gas flow rate of the bypass throttle valve, the second target opening degree being negatively correlated with the first target opening degree to avoid compressor surge.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a method, apparatus, and vehicle for determining the opening degree. Background Technology

[0002] During vehicle operation, air is fed into the fuel cell via a compressor, allowing the fuel cell to convert chemical energy into electrical energy through an electrochemical reaction, thus powering the vehicle. In this process, if oxygen from the air mixes with hydrogen from the fuel cell, it could potentially cause an explosion.

[0003] One prior art provides a hydrogen fuel cell processing system that separates nitrogen and oxygen from the air using a gas separation device and uses nitrogen for purging to remove residual gases from the fuel cell stack. Another prior art provides a nitrogen purging method that enriches nitrogen using an oxygen-permeable membrane and purges the fuel cell stack with nitrogen during shutdown or startup, preventing direct contact between hydrogen and oxygen.

[0004] The methods described above can all prevent oxygen from the air from mixing with hydrogen in the fuel cell. However, these methods do not consider introducing air into the fuel cell stack after purging to facilitate electrochemical reactions, which could potentially cause compressor surge. Therefore, how to avoid compressor surge has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides a method, apparatus, and vehicle for determining the opening degree, so as to at least solve the technical problem that compressors may experience surge in related technologies.

[0006] According to a first aspect of this application, this application provides a method for determining the opening degree. The method includes: acquiring reaction demand information of the fuel cell after the hydrogen chamber of the fuel cell has been vented, the reaction demand information indicating the gas parameters required for the fuel cell to convert chemical energy into electrical energy. During the venting of the hydrogen chamber, the fuel cell's outlet shut-off valve is closed, and the bypass throttle valve is open. Based on the reaction demand information, the outlet shut-off valve is adjusted from the closed state to a first target opening degree, and the bypass throttle valve's opening degree is adjusted to a second target opening degree. The opening degree of the outlet shut-off valve is used to adjust the gas flow rate of the outlet shut-off valve, and the opening degree of the bypass throttle valve is used to adjust the gas flow rate of the bypass throttle valve. The second target opening degree is negatively correlated with the first target opening degree.

[0007] In one possible implementation, the reaction demand information includes flow rate demand information and pressure demand information. The flow rate demand information indicates the gas flow rate required for the fuel cell to convert chemical energy into electrical energy, and the pressure demand information indicates the gas pressure required for the fuel cell to convert chemical energy into electrical energy. Based on the reaction demand information, adjusting the outlet shut-off valve from a closed state to a first target opening and adjusting the bypass throttle valve opening to a second target opening includes: obtaining the first target opening based on the flow rate demand information and the pressure demand information; adjusting the outlet shut-off valve from a closed state to the first target opening; obtaining the second target opening based on the first target opening and the flow rate demand information; and adjusting the bypass throttle valve opening to the second target opening.

[0008] In one possible implementation, the flow requirement information includes the flow requirement of the infeed shut-off valve in the fuel cell, and the pressure requirement information includes the pressure requirement of the infeed shut-off valve. Based on the flow requirement information and the pressure requirement information, a first target opening is obtained, including: acquiring a first correspondence, which includes the correspondence between multiple first preset openings of the outfeed shut-off valve and multiple preset infeed gas information, where one first preset opening corresponds to one preset infeed gas information, and the preset infeed gas information includes: preset infeed gas flow rate and preset infeed gas pressure. Based on the first correspondence, the flow requirement of the infeed shut-off valve, and the pressure requirement of the infeed shut-off valve, the first target opening is obtained.

[0009] In one possible implementation, obtaining a first target opening degree based on a first correspondence, the flow requirement of the infeed shut-off valve, and the pressure requirement of the infeed shut-off valve includes: determining a target rotational speed of the compressor in the fuel cell based on the flow requirement of the infeed shut-off valve and the pressure requirement of the infeed shut-off valve. While maintaining the target rotational speed of the compressor, the first target opening degree is obtained based on the first correspondence, the flow requirement of the infeed shut-off valve, and the pressure requirement of the infeed shut-off valve.

[0010] In one possible implementation, the flow demand information includes the flow demand of the outflow shut-off valve. Based on the first target opening and the flow demand information, a second target opening is obtained, including acquiring the current ambient air pressure. If the current ambient air pressure is less than or equal to a preset air pressure threshold, a second correspondence is obtained. This second correspondence includes a correspondence between multiple second preset openings of the bypass throttle valve and multiple first preset openings, where one second preset opening corresponds to one first preset opening. The first preset opening includes a first preset opening and a preset total flow rate. Based on the flow demand of the inflow shut-off valve and the outflow shut-off valve, a target flow demand is obtained. Based on the second correspondence, the first target opening, and the target flow demand, the second target opening is obtained.

[0011] In one possible implementation, the opening determination method further includes: when the current ambient air pressure is greater than a preset air pressure threshold, obtaining a third correspondence relationship, which includes: a correspondence between multiple second preset openings and multiple second preset opening information, wherein one second preset opening corresponds to one second preset opening information, and the second preset opening information includes: a first preset opening and a preset infeed gas flow rate. Based on the third correspondence relationship, the first target opening, and the flow requirement of the infeed shut-off valve, a second target opening is obtained.

[0012] In one possible implementation, adjusting the discharge shut-off valve from a closed state to a first target opening degree includes: determining the rate of change of the opening degree of the discharge shut-off valve based on the first target opening degree; and adjusting the discharge shut-off valve from a closed state to the first target opening degree based on the rate of change of the opening degree.

[0013] In one possible implementation, the opening determination method further includes: acquiring the infeed flow rate difference and the bypass flow rate difference, wherein the infeed flow rate difference is the difference between the flow rate requirement of the infeed shut-off valve and the current flow rate of the infeed shut-off valve, and the bypass flow rate difference is the difference between the flow rate requirement of the bypass throttle valve and the current flow rate of the bypass throttle valve. If the infeed flow rate difference is less than or equal to a first preset flow rate difference, and / or the bypass flow rate difference is less than or equal to a second preset flow rate difference, the adjustment of the outlet shut-off valve opening and the bypass throttle valve opening is stopped.

[0014] In one possible implementation, the opening determination method further includes: acquiring the flow demand of the inlet shut-off valve and the current flow of the bypass throttle valve in the fuel cell. If the flow demand of the inlet shut-off valve is greater than a first preset flow threshold, and the current flow of the bypass throttle valve is greater than a second preset flow threshold, it is determined that the hydrogen chamber has completed venting.

[0015] According to a second aspect of this application, an opening degree determination device is provided, comprising an acquisition module and a processing module. The acquisition module is used to acquire reaction demand information of the fuel cell when the hydrogen chamber of the fuel cell has been vented. This reaction demand information indicates the gas parameters required for the fuel cell to convert chemical energy into electrical energy. During the venting of the hydrogen chamber, the fuel cell's outlet shut-off valve is closed, and the bypass throttle valve is open. The processing module is used to adjust the outlet shut-off valve from the closed state to a first target opening degree and adjust the bypass throttle valve opening to a second target opening degree based on the reaction demand information. The opening degree of the outlet shut-off valve is used to adjust the gas flow rate of the outlet shut-off valve, and the opening degree of the bypass throttle valve is used to adjust the gas flow rate of the bypass throttle valve. The second target opening degree is negatively correlated with the first target opening degree.

[0016] In one possible implementation, the reaction demand information includes: flow rate demand information and pressure demand information. The flow rate demand information indicates the gas flow rate required for the fuel cell to convert chemical energy into electrical energy, and the pressure demand information indicates the gas pressure required for the fuel cell to convert chemical energy into electrical energy. A processing module is configured to obtain a first target opening degree based on the flow rate demand information and the pressure demand information. The processing module is further configured to adjust the outlet shut-off valve from a closed state to the first target opening degree. The processing module is further configured to obtain a second target opening degree based on the first target opening degree and the flow rate demand information. The processing module is further configured to adjust the opening degree of the bypass throttle valve to the second target opening degree.

[0017] In one possible implementation, the flow requirement information includes the flow requirement of the fuel cell's infeed shut-off valve, and the pressure requirement information includes the pressure requirement of the infeed shut-off valve. An acquisition module is used to acquire a first correspondence, which includes a correspondence between multiple first preset opening degrees of the outfeed shut-off valve and multiple preset infeed gas information, where one first preset opening degree corresponds to one preset infeed gas information, and the preset infeed gas information includes a preset infeed gas flow rate and a preset infeed gas pressure. A processing module is used to obtain a first target opening degree based on the first correspondence, the flow requirement of the infeed shut-off valve, and the pressure requirement of the infeed shut-off valve.

[0018] In one possible implementation, the processing module is configured to determine the target rotational speed of the compressor in the fuel cell based on the flow rate requirement and pressure requirement of the infeed shut-off valve. The processing module is further configured to, while maintaining the target rotational speed of the compressor, obtain a first target opening degree based on a first correspondence, the flow rate requirement and pressure requirement of the infeed shut-off valve.

[0019] In one possible implementation, the flow demand information includes the flow demand of the outflow shut-off valve. An acquisition module is used to acquire the current ambient air pressure. The acquisition module is further used to acquire a second correspondence when the current ambient air pressure is less than or equal to a preset air pressure threshold. The second correspondence includes a correspondence between multiple second preset opening degrees of the bypass throttle valve and multiple first preset opening degree information, where one second preset opening degree corresponds to one first preset opening degree information, and the first preset opening degree information includes a first preset opening degree and a preset total flow rate. A processing module is used to obtain a target flow demand based on the flow demand of the inflow shut-off valve and the flow demand of the outflow shut-off valve. The processing module is further used to obtain a second target opening degree based on the second correspondence, the first target opening degree, and the target flow demand.

[0020] In one possible implementation, the acquisition module is used to acquire a third correspondence when the current ambient air pressure is greater than a preset air pressure threshold. The third correspondence includes a correspondence between multiple second preset opening degrees and multiple second preset opening degree information, where one second preset opening degree corresponds to one second preset opening degree information. The second preset opening degree information includes a first preset opening degree and a preset infeed gas flow rate. The processing module is used to obtain a second target opening degree based on the third correspondence, the first target opening degree, and the flow rate requirement of the infeed shut-off valve.

[0021] In one possible implementation, the processing module is configured to determine the rate of change of the outlet shut-off valve's opening based on a first target opening. The processing module is also configured to adjust the outlet shut-off valve from a closed state to the first target opening based on the rate of change of the opening.

[0022] In one possible implementation, the acquisition module is used to acquire the infeed flow rate difference and the bypass flow rate difference. The infeed flow rate difference is the difference between the flow rate requirement of the infeed shut-off valve and the current flow rate of the infeed shut-off valve. The bypass flow rate difference is the difference between the flow rate requirement of the bypass throttle valve and the current flow rate of the bypass throttle valve. The processing module is used to stop adjusting the opening degree of the outfeed shut-off valve and the opening degree of the bypass throttle valve when the infeed flow rate difference is less than or equal to a first preset flow rate difference and / or the bypass flow rate difference is less than or equal to a second preset flow rate difference.

[0023] In one possible implementation, an acquisition module is used to acquire the flow demand of the infeed shut-off valve and the current flow of the bypass throttle valve in the fuel cell. A processing module is used to determine that the hydrogen chamber has completed venting when the flow demand of the infeed shut-off valve is greater than a first preset flow threshold and the current flow of the bypass throttle valve is greater than a second preset flow threshold.

[0024] According to a third aspect provided in this application, an opening degree determination apparatus is provided, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute instructions to implement the method as described in the first aspect and any possible implementation thereof.

[0025] According to the fourth aspect provided in this application, a vehicle is provided, the vehicle including the opening degree determining device as described in the second aspect, the vehicle being used to implement the method as described in the first aspect above and any possible implementation thereof.

[0026] The beneficial effects of this invention are:

[0027] (1) During the venting of the hydrogen chamber, the fuel cell's outflow valve is closed, and the bypass throttle valve is open, allowing impurities in the hydrogen chamber to be discharged. After the hydrogen chamber of the fuel cell is vented, by acquiring the fuel cell's reaction demand information and adjusting the outflow valve from closed to the first target opening and the bypass throttle valve to the second target opening based on the reaction demand information, the gas flow rate inside the fuel cell can be regulated. Since the opening of the outflow valve can be used to adjust the gas flow rate of the outflow valve, and the opening of the bypass throttle valve can be used to adjust the gas flow rate of the bypass throttle valve, and the second target opening is negatively correlated with the first target opening, the gas flow rate inside the fuel cell can be balanced, preventing the compressor in the fuel cell from surging. Furthermore, by adjusting the opening of the outflow valve and the bypass throttle valve based on the reaction demand information, while regulating the gas flow rate of the outflow valve and the bypass throttle valve, the fuel cell can convert chemical energy into electrical energy, thereby outputting electricity.

[0028] (2) The fuel cell stack generates electrical energy through the chemical reaction of gases. Flow demand information can provide sufficient reactant gases for the fuel cell stack, while pressure demand information can affect the chemical reaction rate of the fuel cell stack. Therefore, based on the flow demand information and pressure demand information, a first target opening degree is obtained, which allows the fuel cell stack to carry out chemical reactions normally without compressor surge. Based on the first target opening degree and flow demand information, a second target opening degree is obtained, which allows the bypass throttle valve and the outgoing shut-off valve to work in tandem. In this way, while increasing the opening degree of the outgoing shut-off valve, the opening degree of the bypass throttle valve can be reduced, thereby adjusting the airflow distribution in the fuel cell, thus avoiding drastic fluctuations in pressure and flow, maintaining stable operating conditions, and preventing compressor surge.

[0029] (3) By obtaining the first correspondence, the correspondence between multiple first preset opening degrees of the discharge shut-off valve and multiple preset gas input information can be obtained when the compressor does not surge. In this way, the first target opening degree obtained by the first correspondence, the flow requirement of the discharge shut-off valve and the pressure requirement of the discharge shut-off valve can ensure that the compressor does not surge.

[0030] (4) When the compressor maintains the target speed, the compressor rotor always operates at a single speed, which can stabilize the mechanical vibration frequency and avoid the shaft resonance range, reducing the risk of vibration failure. Furthermore, when the compressor maintains the target speed, there is no need for complex variable frequency speed control. The control logic complexity and equipment cost can be reduced while avoiding compressor surge, simply by adjusting the opening of the reactor off-stop valve and the bypass throttle valve.

[0031] (5) If the current ambient air pressure is less than or equal to the preset air pressure threshold, it indicates that the fuel cell is in a high-altitude area. Since the air pressure is lower in high-altitude areas and higher inside the fuel cell, it is necessary to bypass the throttle valve to assist the in-pile shut-off valve and the out-of-pile shut-off valve to discharge gas, reduce the pressure difference between the inside and outside of the fuel cell, and thus avoid compressor surge caused by large fluctuations in the gas inside the fuel cell.

[0032] (6) If the current ambient air pressure is greater than the preset air pressure threshold, it indicates that the fuel cell is located in a plain area. Since the air pressure in the plain area is higher, it is closer to the air pressure inside the fuel cell. Therefore, during the fuel cell reaction, only the gas flow rate through the inlet shut-off valve and the opening degree of the outlet shut-off valve need to be considered to determine the opening degree of the bypass throttle valve. This ensures that the airflow and air pressure inside the fuel cell remain stable during the process of switching from hydrogen chamber purging and impurity removal to fuel cell power generation, thus avoiding periodic oscillations inside the compressor.

[0033] (7) During the process of the change of the opening degree of the outgoing valve, the rate of change of the opening degree of the outgoing valve will also affect the pressure and flow rate of the compressor. Therefore, by setting the rate of change of the opening degree and adjusting the outgoing valve from the closed state to the first target opening degree based on the rate of change of the opening degree, the pressure balance and airflow balance inside the fuel cell can be maintained, thereby avoiding periodic oscillation of the airflow inside the compressor.

[0034] (8) When the difference in infeed flow rate is less than or equal to the first preset flow rate difference, and / or the difference in bypass flow rate is less than or equal to the second preset flow rate difference, it indicates that the actual gas flow rate through the infeed shut-off valve is close to the flow rate requirement of the infeed shut-off valve, and the opening of the outfeed shut-off valve has been adjusted to the first target opening, and the opening of the bypass throttle valve has been adjusted to the second target opening. In other words, the actual gas flow rate through the infeed shut-off valve meets the conditions for the fuel cell stack to undergo a chemical reaction. At this time, stopping the adjustment of the opening of the outfeed shut-off valve and the opening of the bypass throttle valve can reduce resource consumption.

[0035] (9) When the flow demand of the infeed shut-off valve changes from 0 to greater than the first preset flow threshold, it indicates that the fuel cell is about to undergo a chemical reaction through the stack. When the current flow of the bypass throttle valve is greater than the second preset flow threshold, it indicates that the flow into the compressor is increasing, and the fuel cell is about to undergo a chemical reaction through the stack. At this time, it can be determined that the hydrogen chamber has been vented, and the opening of the outfeed shut-off valve and the bypass throttle valve can be adjusted to ensure that the compressor does not surge during the process of switching from hydrogen chamber purging to fuel cell power generation.

[0036] It should be noted that the technical effects of any of the implementation methods in the second to fourth aspects can be found in the technical effects of the corresponding implementation methods in the first aspect, and will not be repeated here.

[0037] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0039] Figure 1 This is a schematic diagram of the structure of a fuel cell system according to an exemplary embodiment;

[0040] Figure 2 This is a flowchart illustrating an opening degree determination method according to an exemplary embodiment;

[0041] Figure 3 This is a schematic diagram of the structure of an opening degree determining device according to an exemplary embodiment;

[0042] Figure 4 This is a schematic diagram of another opening degree determining device according to an exemplary embodiment. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0044] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0045] This application provides a method for determining the opening degree. In this method, during the venting of the hydrogen chamber, the fuel cell's outflow valve is closed, and the bypass throttle valve is open, allowing impurities in the hydrogen chamber to be discharged. After the hydrogen chamber of the fuel cell is vented, by acquiring the fuel cell's reaction demand information and adjusting the outflow valve from closed to a first target opening degree and the bypass throttle valve opening to a second target opening degree based on this information, the gas flow rate inside the fuel cell can be regulated. Since the opening degree of the outflow valve can be used to adjust the gas flow rate of the outflow valve, and the opening degree of the bypass throttle valve can be used to adjust the gas flow rate of the bypass throttle valve, and the second target opening degree is negatively correlated with the first target opening degree, a gas flow balance can be achieved inside the fuel cell, preventing compressor surge in the fuel cell. Furthermore, by adjusting the opening degrees of the outflow valve and bypass throttle valve based on the reaction demand information, while regulating the gas flow rate of the outflow valve and bypass throttle valve, the fuel cell can convert chemical energy into electrical energy, thereby outputting electricity.

[0046] It should be noted that the execution entity of the opening degree determination method provided in this application can be an opening degree determination device, which can be a fuel cell system or a vehicle. Furthermore, the device can also be the vehicle's central processing unit (CPU), a module within that device used to determine the opening degree, or an in-vehicle infotainment system; this application does not impose any limitations on this. In this embodiment, the opening degree determination method is illustrated using a vehicle as an example.

[0047] The implementation environment of the embodiments of this application is described below.

[0048] For example, such as Figure 1 As shown, a fuel cell system is illustrated. The fuel cell system includes a fuel cell control system and an air subsystem. The air subsystem includes an air filter, a flow meter, a compressor, an intercooler, a temperature sensor, a first pressure sensor, a stack inlet shut-off valve, the fuel cell stack, a stack outlet shut-off valve, a bypass throttle valve, a second pressure sensor, and a muffler.

[0049] The air filter is used to filter the gas entering the compressor.

[0050] A flow meter is used to measure the flow rate of filtered gas.

[0051] A compressor is used to compress filtered gas.

[0052] An intercooler is used to cool the gas whose temperature rises during the compression process of a compressor.

[0053] Temperature sensor used to measure the temperature of gas flowing through the infeed shut-off valve.

[0054] The first pressure sensor is used to measure the pressure of the gas flowing through the infeed shut-off valve.

[0055] The infeed shut-off valve is used to regulate the flow rate and pressure of the infeed air.

[0056] A fuel cell stack is used to generate electricity through an electrochemical reaction involving hydrogen and oxygen.

[0057] The discharge shut-off valve is used to regulate the flow rate and pressure of the discharge air.

[0058] The bypass throttle valve is used to regulate the flow and pressure of air in the bypass passage.

[0059] The second pressure sensor is used to measure the pressure of the gas flowing through the bypass throttle valve.

[0060] A muffler is used to reduce the noise generated during the operation of a fuel cell system.

[0061] It should be noted that this application does not limit the type of compressor. For example, the compressor can be an air compressor.

[0062] Optionally, the flow meter is connected between the air filter and the compressor, the temperature sensor is connected between the inlet shut-off valve and the intercooler, the first pressure sensor is located at the inlet of the inlet shut-off valve, and the second pressure sensor is located at the outlet of the bypass throttle valve.

[0063] It should be noted that during the startup of the fuel cell system, impurity purging is required to ensure the purity of the reactant gas in the hydrogen chamber of the fuel cell stack. At this time, the air subsystem can regulate the airflow through the bypass throttle valve by controlling its opening, thereby ensuring that the hydrogen concentration in the exhaust gas remains within a safe threshold.

[0064] In one possible design, the infeed and outfeed shut-off valves are closed. The fuel cell control system can control the bypass throttle to open. Then, the fuel cell control system can control the compressor to rotate. Driven by the compressor, air flows through the air filter and compressor according to a preset gas flow rate and preset gas pressure. Then, the fuel cell control system can control the intercooler to cool the air whose temperature has risen after flowing through the compressor. Afterward, the cooled air flows through the bypass throttle and muffler, mixes with the gas on the anode side of the fuel cell stack, and is then discharged from the fuel cell system.

[0065] It should be noted that whether the flow and pressure requirements are met is determined by the feedback values ​​from the flow meter, the first pressure sensor, and the second pressure sensor.

[0066] It should be noted that after the fuel cell system undergoes impurity purging, it begins preparing to generate electricity. At this time, the bypass throttle valve gradually closes, while the in-stack shut-off valve and out-stack shut-off valve slowly open. Air needs to be introduced into the air chamber of the fuel cell stack, and the current is controlled to generate electricity after the fuel cell system establishes voltage.

[0067] To avoid compressor surge during this process, the traditional method involves first shutting down the compressor and bypass valve. Only after confirming there is no risk of compressor surge is the outlet shut-off valve opened, and the compressor is requested to start only when the actual opening of the outlet shut-off valve exceeds a certain threshold. However, this method increases the compressor start-up and shutdown process, affecting the lifespan of the compressor's air bearings. Furthermore, it results in a longer system start-up response time, impacting the fuel cell's power generation time.

[0068] Therefore, the opening degree of the stack shut-off valve and the bypass throttle valve can be controlled by the fuel cell control system to prevent compressor surge.

[0069] In one possible design, the fuel cell system can acquire the system's power generation demand, the current ambient temperature, and the current ambient air pressure. Then, the fuel cell control system can calculate the flow rate and pressure requirements of the infeed shut-off valve based on the system's power generation demand. The fuel cell control system can also calculate the flow rate requirement of the bypass throttle valve based on the current ambient air pressure. The fuel cell control system can measure the current flow rate of the bypass throttle valve using a second pressure sensor. If the flow rate requirement of the infeed shut-off valve is greater than a first preset flow rate threshold, and the current flow rate of the bypass throttle valve is greater than a second preset flow rate threshold, the hydrogen chamber is determined to have completed venting.

[0070] Subsequently, the fuel cell control system can calculate the total flow requirement and the target speed of the compressor based on the current ambient temperature, current ambient air pressure, flow requirement of the bypass throttle valve, flow requirement of the inlet shut-off valve, and pressure requirement of the inlet shut-off valve, and control the compressor to operate based on the total flow requirement and the target speed. Next, the fuel cell control system can determine the first target opening degree of the outlet shut-off valve based on the flow requirement and pressure requirement of the inlet shut-off valve and a first correspondence, and determine the opening change rate of the outlet shut-off valve based on the first target opening degree. Then, the fuel cell control system can adjust the outlet shut-off valve from the closed state to the first target opening degree based on the opening change rate. Next, the fuel cell control system can determine the second target opening degree based on a second correspondence, the first target opening degree, and the target flow requirement. Finally, the fuel cell control system can adjust the opening degree of the bypass throttle valve to the second target opening degree.

[0071] Subsequently, the fuel cell control system can acquire the infeed flow rate difference and the bypass flow rate difference. The infeed flow rate difference is the difference between the flow rate requirement of the infeed shut-off valve and the current flow rate of the infeed shut-off valve. The bypass flow rate difference is the difference between the flow rate requirement of the bypass throttle valve and the current flow rate of the bypass throttle valve. If the infeed flow rate difference is less than or equal to a first preset flow rate difference, and / or the bypass flow rate difference is less than or equal to a second preset flow rate difference, the fuel cell control system can stop adjusting the opening of the outfeed shut-off valve and the opening of the bypass throttle valve. If the infeed flow rate difference is greater than the first preset flow rate difference, and the bypass flow rate difference is greater than the second preset flow rate difference, the fuel cell control system continues to adjust the outfeed shut-off valve from the closed state to the first target opening, and adjusts the opening of the bypass throttle valve to the second target opening.

[0072] It should be noted that the first correspondence is the relationship between multiple preset opening degrees of the discharge shut-off valve and multiple preset feed gas information under pre-tested and calibrated standard operating conditions. Each preset opening degree corresponds to one preset feed gas information, which includes: preset feed gas flow rate and preset feed gas pressure. The second correspondence is the opening characteristics of the discharge shut-off valve and bypass throttle valve under pre-tested and calibrated standard operating conditions.

[0073] It should be noted that this application does not impose any restrictions on standard operating conditions. For example, standard operating conditions can be 0 degrees Celsius (°C) and 1 standard atmosphere (atm).

[0074] It should be noted that the fuel cell control system can collect feedback signal values ​​from the flow meter, the first pressure sensor, the temperature sensor, and the second pressure sensor through the wiring harness.

[0075] Therefore, based on the analysis of the air system's response process during fuel cell system startup, and considering the impact of the opening degrees of the stack outlet shut-off valve and bypass throttle valve on the system's flow resistance characteristics, the opening of the stack outlet shut-off valve and the closing of the bypass throttle valve can be smoothly controlled to avoid compressor surge. Furthermore, the compressor can still operate normally during fuel cell system startup, thereby improving system response speed and increasing compressor lifespan.

[0076] For ease of understanding, the following description, in conjunction with the accompanying drawings, provides a detailed explanation of the aperture determination method provided in this application.

[0077] like Figure 2 As shown, the method for determining the opening degree includes:

[0078] S201. After the hydrogen chamber of the fuel cell has been vented, obtain the reaction demand information of the fuel cell.

[0079] In this embodiment of the application, during the process of venting the hydrogen chamber, the stack exit valve in the fuel cell is in the closed state, and the bypass throttle valve in the fuel cell is in the open state.

[0080] Among them, the reaction requirement information is used to indicate the gas parameters required for the fuel cell to convert chemical energy into electrical energy.

[0081] Optionally, the reaction requirement information includes: flow rate requirement information and pressure requirement information. The flow rate requirement information is used to indicate the gas flow rate required for the fuel cell to convert chemical energy into electrical energy, and the pressure requirement information is used to indicate the gas pressure required for the fuel cell to convert chemical energy into electrical energy.

[0082] In one possible design, the flow requirement information includes the flow requirements of the infeed shut-off valve and the outfeed shut-off valve in the fuel cell, and the pressure requirement information includes the pressure requirement of the infeed shut-off valve.

[0083] S202. Based on the reaction demand information, adjust the reactor discharge shut-off valve from the closed state to the first target opening degree.

[0084] The opening degree of the discharge shut-off valve is used to adjust the gas flow rate of the discharge shut-off valve.

[0085] In one possible implementation, the first target opening degree can be obtained based on flow demand information and pressure demand information. Then, the outflow shut-off valve can be adjusted from the closed state to the first target opening degree.

[0086] It should be noted that if the outflow and inflow shut-off valves are not open or are opened at too small an angle, and the bypass throttle valve is closed or opened at too small an angle, the gas flow in the system will suddenly decrease, causing a pressure drop that may fall below the compressor's surge threshold, thus triggering compressor surge.

[0087] It is understandable that the fuel cell stack generates electricity through the chemical reaction of gases. Flow rate requirements can provide sufficient reactant gases to the stack, while pressure requirements can influence the chemical reaction rate. Therefore, by determining the initial target opening based on both flow rate and pressure requirements, the fuel cell stack can proceed with the chemical reaction normally while avoiding compressor surge.

[0088] Optionally, a first correspondence can be obtained, which includes the correspondence between multiple first preset openings of the discharge shut-off valve and multiple preset feed gas information. Each first preset opening corresponds to one preset feed gas information, which includes preset feed gas flow rate and preset feed gas pressure. Then, based on the first correspondence, the flow rate requirement of the feed shut-off valve, and the pressure requirement of the feed shut-off valve, a first target opening is obtained.

[0089] For example, the preset feed gas flow rate 1 is 25 g / s, the preset feed gas pressure 1 is 170 kPa, and the first preset opening 1 is 25%; the preset feed gas flow rate 2 is 27 g / s, the preset feed gas pressure 2 is 270 kPa, and the first preset opening 2 is 28%; the preset feed gas flow rate 3 is 27 g / s, the preset feed gas pressure 3 is 300 kPa, and the first preset opening 3 is 30%. If the feed shut-off valve's flow rate requirement is 27 g / s and its pressure requirement is 300 kPa, then the first target opening is 30%.

[0090] It should be noted that even with both the discharge shut-off valve and the bypass throttle valve open, the compressor may still experience surge in some scenarios.

[0091] Understandably, by obtaining the first correspondence, the correspondence between multiple preset opening degrees of the discharge shut-off valve and multiple preset gas input information can be obtained under the condition that the compressor does not surge. Thus, the first target opening degree obtained through the first correspondence, the flow requirement of the discharge shut-off valve, and the pressure requirement of the discharge shut-off valve can ensure that the compressor does not surge.

[0092] Optionally, the target rotational speed of the compressor in the fuel cell can be determined based on the flow rate requirement and pressure requirement of the infeed shut-off valve. Then, while maintaining the target rotational speed of the compressor, a first target opening degree is obtained based on the first correspondence, the flow rate requirement and pressure requirement of the infeed shut-off valve.

[0093] Specifically, the current ambient air pressure and current ambient temperature can be obtained. Then, based on the current ambient air pressure, current ambient temperature, and the pressure requirement of the inlet shut-off valve, data processing can be performed to obtain the compressor's target speed.

[0094] It should be noted that during dynamic processes such as vehicle acceleration and deceleration, parameters such as the air compressor's speed, flow rate, and pressure ratio change rapidly. If the compressor's speed changes, components such as the impeller and bearings need to withstand alternating stresses caused by the speed change. This may lead to premature wear of components such as mechanical seals and couplings. Furthermore, it may cause the compressor to surge.

[0095] Understandably, when the compressor maintains its target speed, the compressor rotor operates at a single speed, which stabilizes the mechanical vibration frequency, avoids the shaft resonance range, and reduces the risk of vibration failure. Furthermore, when the compressor maintains its target speed, complex variable frequency speed control is unnecessary. Simply adjusting the opening of the discharge shut-off valve and the bypass throttle valve can meet the reactor stack reaction conditions while reducing the complexity of control logic and equipment costs, and preventing compressor surge.

[0096] S203. Adjust the opening of the bypass throttle valve to the second target opening.

[0097] The bypass throttle opening is used to adjust the gas flow rate of the bypass throttle, and the second target opening is negatively correlated with the first target opening.

[0098] In one possible implementation, a second target opening can be obtained based on the first target opening and the flow demand information. Then, the opening of the bypass throttle valve can be adjusted to the second target opening.

[0099] Understandably, based on the first target opening degree and flow demand information, a second target opening degree is obtained, which allows the bypass throttle valve and the outflow shut-off valve to work in tandem. Thus, by increasing the outflow shut-off valve opening, the bypass throttle valve opening can be reduced, thereby adjusting the airflow distribution within the fuel cell, preventing drastic fluctuations in pressure and flow, maintaining stable operating conditions, and avoiding compressor surge.

[0100] In one possible design, the current ambient air pressure can be obtained. Then, if the current ambient air pressure is less than or equal to a preset air pressure threshold, a second correspondence is obtained. This second correspondence includes the correspondence between multiple second preset opening degrees of the bypass throttle valve and multiple first preset opening degree information, where one second preset opening degree corresponds to one first preset opening degree information. The first preset opening degree information includes: the first preset opening degree and the preset total flow rate. Then, based on the flow rate requirements of the inlet shut-off valve and the outlet shut-off valve, the target flow rate requirement can be obtained. Finally, based on the second correspondence, the first target opening degree, and the target flow rate requirement, the second target opening degree can be obtained.

[0101] It is understandable that if the current ambient air pressure is less than or equal to the preset air pressure threshold, it indicates that the fuel cell is in a high-altitude region. Because the air pressure is lower in high-altitude regions and higher inside the fuel cell, a bypass throttle valve is needed to assist the infeed and outfeed shut-off valves in discharging gas, reducing the pressure difference between the inside and outside of the fuel cell, thereby avoiding compressor surge caused by large fluctuations in the gas inside the fuel cell.

[0102] In another possible design, when the current ambient air pressure is greater than a preset air pressure threshold, a third correspondence is obtained. This third correspondence includes the correspondence between multiple second preset opening degrees and multiple second preset opening degree information, where one second preset opening degree corresponds to one second preset opening degree information. The second preset opening degree information includes a first preset opening degree and a preset infeed gas flow rate. Then, based on the third correspondence, the first target opening degree, and the flow rate requirement of the infeed shut-off valve, the second target opening degree can be obtained.

[0103] It is understandable that if the current ambient air pressure is higher than the preset air pressure threshold, it indicates that the fuel cell is located in a flat area. Since the air pressure in a flat area is higher, it is closer to the air pressure inside the fuel cell. Therefore, during the fuel cell reaction, only the gas flow rate through the inlet shut-off valve and the opening degree of the outlet shut-off valve need to be considered to determine the opening degree of the bypass throttle. This ensures stable airflow and pressure inside the fuel cell during the transition from hydrogen chamber purging and impurity removal to fuel cell power generation, preventing periodic oscillations within the compressor.

[0104] Based on the above technical solution, during the venting of the hydrogen chamber, the fuel cell's outflow valve is closed, while the bypass throttle valve is open, allowing impurities in the hydrogen chamber to be discharged. After the hydrogen chamber of the fuel cell is vented, by acquiring the fuel cell's reaction demand information and adjusting the outflow valve from closed to a first target opening and the bypass throttle valve to a second target opening based on this information, the gas flow rate inside the fuel cell can be regulated. Since the opening of the outflow valve can be used to adjust the gas flow rate, and the opening of the bypass throttle valve can be used to adjust the gas flow rate, and the second target opening is negatively correlated with the first target opening, a gas flow balance can be achieved inside the fuel cell, preventing compressor surge. Furthermore, by adjusting the openings of the outflow valve and bypass throttle valve based on the reaction demand information, while simultaneously regulating the gas flow rate of the outflow valve and bypass throttle valve, the fuel cell can convert chemical energy into electrical energy, thereby outputting electricity.

[0105] It should be noted that adjusting the outlet shut-off valve from the closed state to the first target opening degree, and adjusting the bypass throttle valve opening degree to the second target opening degree, is a process of change.

[0106] In some embodiments, the rate of change of the outlet valve opening can be determined based on a first target opening. Then, based on the rate of change of the opening, the outlet valve can be adjusted from a closed state to the first target opening.

[0107] Understandably, as the opening degree of the fuel cell discharge shut-off valve changes, the rate of change of the valve's opening degree also affects the compressor's pressure and flow rate. Therefore, by setting the rate of change of the opening degree and adjusting the discharge shut-off valve from the closed state to the first target opening degree based on this rate of change, the internal pressure and airflow balance of the fuel cell can be maintained, thereby preventing periodic oscillations in the airflow within the compressor.

[0108] It should be understood that after obtaining the first target opening degree, the opening degree of the outlet shut-off valve cannot be immediately adjusted to the first target opening degree. Similarly, the opening degree of the bypass throttle valve cannot be immediately adjusted to the second target opening degree.

[0109] In some embodiments, the current opening degree of the outgoing reactor shut-off valve can be obtained. Then, based on the current opening degree of the outgoing reactor shut-off valve and a second correspondence, a target variable opening degree of the bypass throttle valve can be obtained. Then, the opening degree of the bypass throttle valve can be adjusted to the target variable opening degree. Then, the updated current opening degree of the outgoing reactor shut-off valve can be obtained, and based on the updated current opening degree of the outgoing reactor shut-off valve and the second correspondence, an updated target variable opening degree can be obtained. Then, the opening degree of the bypass throttle valve can be adjusted to the updated target variable opening degree. This process is iterated until the current opening degree of the outgoing reactor shut-off valve is adjusted to the first target opening degree.

[0110] It should be understood that when the current opening of the reactor gate valve is adjusted to the first target opening, the updated target change opening is the second target opening.

[0111] It should be noted that adjusting the actual gas flow rate through the reactor inlet shut-off valve to meet its flow rate requirement is a variable process. Similarly, adjusting the actual gas flow rate through the bypass throttle valve to meet its flow rate requirement is also a variable process. With the total flow rate remaining constant, there is a correlation between the actual gas flow rate through the reactor inlet shut-off valve, the actual gas flow rate through the bypass throttle valve, the opening degree of the reactor outlet shut-off valve, and the opening degree of the bypass throttle valve. If the current opening degree of the reactor outlet shut-off valve is not adjusted to the first target opening degree, and the current opening degree of the bypass throttle valve is not adjusted to the second target opening degree, then the actual gas flow rate through the reactor inlet shut-off valve will also fail to meet its flow rate requirement, and the actual gas flow rate through the bypass throttle valve will also fail to meet its flow rate requirement.

[0112] In other words, if the actual gas flow through the inlet shut-off valve reaches the flow requirement of the inlet shut-off valve, and / or the actual gas flow through the bypass throttle valve reaches the flow requirement of the bypass throttle valve, it means that the opening degree of the outlet shut-off valve has reached the first target opening degree, and the opening degree of the bypass throttle valve has reached the second target opening degree.

[0113] In some embodiments, the infeed flow rate difference and the bypass flow rate difference can be obtained. The infeed flow rate difference is the difference between the flow rate requirement of the infeed shut-off valve and the current flow rate of the infeed shut-off valve. The bypass flow rate difference is the difference between the flow rate requirement of the bypass throttle valve and the current flow rate of the bypass throttle valve. Then, if the infeed flow rate difference is less than or equal to a first preset flow rate difference, and / or the bypass flow rate difference is less than or equal to a second preset flow rate difference, the adjustment of the outlet shut-off valve opening and the bypass throttle valve opening is stopped.

[0114] Understandably, when the difference in infeed flow rate is less than or equal to the first preset flow rate difference, and / or the difference in bypass flow rate is less than or equal to the second preset flow rate difference, it indicates that the actual gas flow rate through the infeed shut-off valve is close to the flow rate requirement of the infeed shut-off valve, and the opening of the outfeed shut-off valve has been adjusted to the first target opening, and the opening of the bypass throttle valve has been adjusted to the second target opening. In other words, the actual gas flow rate through the infeed shut-off valve meets the conditions for a chemical reaction to occur in the fuel cell stack. At this point, stopping the adjustment of the opening of the outfeed shut-off valve and the bypass throttle valve can reduce resource consumption.

[0115] In some embodiments, the flow demand of the inlet shut-off valve and the current flow of the bypass throttle valve in the fuel cell can be obtained. Then, if the flow demand of the inlet shut-off valve is greater than a first preset flow threshold and the current flow of the bypass throttle valve is greater than a second preset flow threshold, it is determined that the hydrogen chamber has been vented.

[0116] Understandably, when the flow demand at the infeed shut-off valve changes from 0 to greater than the first preset flow threshold, it indicates that the fuel cell is about to undergo a chemical reaction through the stack. When the current flow at the bypass throttle valve exceeds the second preset flow threshold, it indicates an increase in the flow into the compressor, meaning the fuel cell is about to undergo a chemical reaction through the stack. At this point, the hydrogen chamber can be vented, and the opening of the outfeed shut-off valve and the bypass throttle valve can be adjusted to prevent compressor surge during the transition from hydrogen chamber purging to fuel cell power generation.

[0117] The foregoing mainly describes the solutions provided by the embodiments of this application from a methodological perspective. To achieve the above functions, the opening degree determination device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily recognize that, based on the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0118] This application embodiment can divide the opening degree determination device into functional modules according to the above method. For example, the opening degree determination device may include functional modules corresponding to each functional division, or two or more functions may be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. It should be noted that the module division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0119] Reference Figure 3 The opening degree determination device includes an acquisition module 301 and a processing module 302.

[0120] The acquisition module 301 is used to acquire reaction demand information of the fuel cell after the hydrogen chamber of the fuel cell has been vented. The reaction demand information is used to indicate the gas parameters required for the fuel cell to convert chemical energy into electrical energy. During the venting process of the hydrogen chamber, the fuel cell's stack exit valve is in the closed state, and the fuel cell's bypass throttle valve is in the open state.

[0121] The processing module 302 is used to adjust the outlet shut-off valve from the closed state to a first target opening degree and the bypass throttle valve opening degree to a second target opening degree based on the reaction demand information. The opening degree of the outlet shut-off valve is used to adjust the gas flow rate of the outlet shut-off valve, and the opening degree of the bypass throttle valve is used to adjust the gas flow rate of the bypass throttle valve. The second target opening degree is negatively correlated with the first target opening degree.

[0122] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0123] like Figure 4 As shown, the opening degree determination device includes, but is not limited to, a processor 401 and a memory 402.

[0124] The memory 402 described above is used to store the executable instructions of the processor 401. It is understood that the processor 401 is configured to execute instructions to implement the opening degree determination method in the above embodiments.

[0125] It should be noted that those skilled in the art will understand that Figure 4 The structure of the opening degree determining device shown does not constitute a limitation on the opening degree determining device. The opening degree determining device may include a ratio Figure 4 This may indicate more or fewer components, or a combination of certain components, or a different arrangement of components.

[0126] The processor 401 is the control center of the aperture determination device. It connects various parts of the device via various interfaces and lines, and performs various functions and processes data by running or executing software programs and / or modules stored in the memory 402, and by calling data stored in the memory 402, thereby providing overall monitoring of the aperture determination device. The processor 401 may include one or more processing units. Optionally, the processor 401 may integrate an application processor and a modem processor. The application processor primarily handles the operating system, user interface, and applications, while the modem processor primarily handles wireless communication. It is understood that the modem processor may not be integrated into the processor 401.

[0127] The memory 402 can be used to store software programs and various data. The memory 402 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, application programs required by at least one functional module (such as a determination unit, processing unit, etc.), etc. Furthermore, the memory 402 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0128] In an exemplary embodiment, this application also provides a vehicle that includes an opening degree determining device, which can be used to perform the methods described above.

[0129] It should be noted that the vehicles can be, but are not limited to, pure electric vehicles (PEV / BEV), hybrid electric vehicles (HEV), range-extended electric vehicles (REEV), plug-in hybrid electric vehicles (PHEV), new energy vehicles, and gasoline vehicles.

[0130] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 402 including instructions, which can be executed by a processor 401 of an opening determination device to implement the methods in the above embodiments.

[0131] In actual implementation, Figure 3 The functions of the acquisition module 301 and the processing module 302 can both be provided by Figure 4The processor 401 calls the computer program stored in the memory 402 to implement the process. The specific execution process can be found in the description of the method section in the previous embodiment, and will not be repeated here.

[0132] Optionally, the computer-readable storage medium may be a non-transitory computer-readable storage medium, such as a read-only memory (ROM), a random access memory (RAM), a compact disc read-only memory (CD-ROM), magnetic tape, floppy disk, and optical data storage device.

[0133] In an exemplary embodiment, this application also provides a computer program product including one or more instructions, which can be executed by the processor 401 of the opening degree determination device to perform the method described above.

[0134] It should be noted that when one or more instructions in the computer-readable storage medium or computer program product are executed by the processor of the opening degree determination device, they implement the various processes of the above method embodiments and achieve the same technical effect as the above method. To avoid repetition, they will not be described again here.

[0135] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0136] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another apparatus, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0137] The units described as separate components may or may not be physically separate. A component shown as a unit can be one or more physical units; that is, it can be located in one place or distributed in multiple different locations. Some or all of the classified units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0138] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0139] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, essentially, or the part that contributes to the prior art, or a complete or partial classification of the technical solution, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0140] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for determining the opening degree, characterized in that, The method for determining the opening degree includes: When the hydrogen chamber of the fuel cell is vented, the reaction demand information of the fuel cell is obtained. The reaction demand information is used to indicate the gas parameters required for the fuel cell to convert chemical energy into electrical energy. The reaction demand information includes the flow rate requirement of the infeed shut-off valve and the flow rate requirement of the outfeed shut-off valve in the fuel cell. During the venting of the hydrogen chamber, the outfeed shut-off valve in the fuel cell is closed and the bypass throttle valve in the fuel cell is open. Based on the reaction requirement information, the discharge shut-off valve is adjusted from the closed state to the first target opening degree, and the opening degree of the discharge shut-off valve is used to adjust the gas flow rate of the discharge shut-off valve. Obtain the current ambient air pressure; When the current ambient air pressure is less than or equal to a preset air pressure threshold, a second correspondence is obtained. The second correspondence includes the correspondence between multiple second preset openings of the bypass throttle valve and multiple first preset opening information. One second preset opening corresponds to one first preset opening information. The first preset opening information includes the first preset opening and preset total flow of the stack-out stop valve. Based on the flow requirements of the infeed shut-off valve and the outfeed shut-off valve, the target flow requirement is obtained. Based on the second correspondence, the first target opening degree, and the target traffic demand, the second target opening degree is obtained; When the current ambient air pressure is greater than a preset air pressure threshold, a third correspondence is obtained. The third correspondence includes the correspondence between the plurality of second preset opening degrees and the plurality of second preset opening information. One second preset opening degree corresponds to one second preset opening information. The second preset opening information includes the first preset opening degree and the preset infeed gas flow rate. Based on the third correspondence, the first target opening degree, and the flow requirement of the infeed shut-off valve, the second target opening degree is obtained; Adjust the opening of the bypass throttle valve to the second target opening; The opening degree of the bypass throttle valve is used to adjust the gas flow rate of the bypass throttle valve, and the second target opening degree is negatively correlated with the first target opening degree.

2. The method for determining the opening degree according to claim 1, characterized in that, The reaction requirement information includes flow rate requirement information and pressure requirement information. The flow rate requirement information is used to indicate the gas flow rate required for the fuel cell to convert chemical energy into electrical energy, and the pressure requirement information is used to indicate the gas pressure required for the fuel cell to convert chemical energy into electrical energy. The step of adjusting the reactor shut-off valve from the closed state to the first target opening degree based on the reaction demand information includes: Based on the traffic demand information and the pressure demand information, the first target opening degree is obtained; Adjust the discharge shut-off valve from the closed state to the first target opening degree.

3. The method for determining the opening degree according to claim 2, characterized in that, The flow requirement information includes the flow requirement of the fuel cell inlet shut-off valve, and the pressure requirement information includes the pressure requirement of the inlet shut-off valve; obtaining the first target opening degree based on the flow requirement information and the pressure requirement information includes: Obtain a first correspondence relationship, which includes: the correspondence between multiple first preset openings of the discharge shut-off valve and multiple preset gas input information, wherein one first preset opening corresponds to one preset gas input information, and the preset gas input information includes: preset gas input flow rate and preset gas input pressure; Based on the first correspondence, the flow requirement of the infeed shut-off valve, and the pressure requirement of the infeed shut-off valve, the first target opening degree is obtained.

4. The method for determining the opening degree according to claim 3, characterized in that, The process of obtaining the first target opening degree based on the first correspondence, the flow requirement of the infeed shut-off valve, and the pressure requirement of the infeed shut-off valve includes: Based on the flow rate requirement and pressure requirement of the infeed shut-off valve, the target rotational speed of the compressor in the fuel cell is determined. While the compressor maintains the target speed, the first target opening degree is obtained based on the first correspondence, the flow requirement of the infeed shut-off valve, and the pressure requirement of the infeed shut-off valve.

5. The method for determining the opening degree according to any one of claims 1-4, characterized in that, Adjusting the discharge shut-off valve from the closed state to the first target opening degree includes: Based on the first target opening degree, determine the rate of change of the opening degree of the outflow shut-off valve; Based on the opening change rate, the outflow shut-off valve is adjusted from the closed state to the first target opening.

6. The method for determining the opening degree according to any one of claims 1-4, characterized in that, The method for determining the opening degree also includes: Obtain the infeed flow rate difference and the bypass flow rate difference. The infeed flow rate difference is the difference between the flow rate requirement of the infeed shut-off valve and the current flow rate of the infeed shut-off valve. The bypass flow rate difference is the difference between the flow rate requirement of the bypass throttle valve and the current flow rate of the bypass throttle valve. If the difference in the infeed flow rate is less than or equal to a first preset flow rate difference, and / or the difference in the bypass flow rate is less than or equal to a second preset flow rate difference, the adjustment of the opening of the outfeed shut-off valve and the opening of the bypass throttle valve shall be stopped.

7. The method for determining the opening degree according to any one of claims 1-4, characterized in that, The method for determining the opening degree also includes: Obtain the flow requirement of the stack cut-off valve in the fuel cell and the current flow of the bypass throttle valve; If the flow requirement of the inlet shut-off valve is greater than the first preset flow threshold and the current flow of the bypass throttle valve is greater than the second preset flow threshold, it is determined that the hydrogen chamber has completed exhaust.

8. An opening degree determining device, characterized in that, The device includes an acquisition module and a processing module; The acquisition module is used to acquire the reaction demand information of the fuel cell when the hydrogen chamber of the fuel cell has been vented. The reaction demand information is used to indicate the gas parameters required for the fuel cell to convert chemical energy into electrical energy. The reaction demand information includes the flow rate requirement of the infeed shut-off valve and the flow rate requirement of the outfeed shut-off valve in the fuel cell. During the venting of the hydrogen chamber, the outfeed shut-off valve in the fuel cell is in a closed state, and the bypass throttle valve in the fuel cell is in an open state. The processing module is used to adjust the discharge shut-off valve from a closed state to a first target opening degree based on the reaction demand information, and the opening degree of the discharge shut-off valve is used to adjust the gas flow rate of the discharge shut-off valve. The acquisition module is also used to acquire the current ambient air pressure; The acquisition module is further configured to acquire a second correspondence when the current ambient air pressure is less than or equal to a preset air pressure threshold. The second correspondence includes the correspondence between multiple second preset openings of the bypass throttle valve and multiple first preset opening information. One second preset opening corresponds to one first preset opening information. The first preset opening information includes the first preset opening and preset total flow of the stack-out stop valve. The processing module is also used to obtain the target flow requirement based on the flow requirement of the infeed shut-off valve and the flow requirement of the outfeed shut-off valve. The processing module is further configured to obtain a second target opening based on the second correspondence, the first target opening, and the target traffic demand; The acquisition module is further configured to acquire a third correspondence when the current ambient air pressure is greater than a preset air pressure threshold. The third correspondence includes the correspondence between the plurality of second preset opening degrees and the plurality of second preset opening degree information, wherein one second preset opening degree corresponds to one second preset opening degree information, and the second preset opening degree information includes the first preset opening degree and the preset infeed gas flow rate. The processing module is further configured to obtain the second target opening based on the third correspondence, the first target opening, and the flow requirement of the infeed shut-off valve; The processing module is also used to adjust the opening of the bypass throttle valve to the second target opening. The opening degree of the bypass throttle valve is used to adjust the gas flow rate of the bypass throttle valve, and the second target opening degree is negatively correlated with the first target opening degree.

9. An opening degree determining device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the opening degree determination method as described in any one of claims 1 to 7.

10. A vehicle, characterized in that, The vehicle includes the opening degree determining device as described in claim 9.

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