Opening degree determination method and device and vehicle

Abstract

The invention relates to an opening degree determining method and device and a vehicle, relates to the technical field of batteries, and at least solves the technical problem that surge may occur to a compressor in the related technology. The method comprises the following steps: under the condition that a hydrogen cavity of the fuel cell finishes exhausting, obtaining reaction demand information of the fuel cell, the reaction demand information being used for indicating gas parameters required by the fuel cell for converting chemical energy into electric energy; wherein in the process of exhausting the hydrogen cavity, a stack-out stop valve in the fuel cell is in a closed state, and a bypass throttle valve in the fuel cell is in an open state; on the basis of the reaction demand information, the reactor-out stop valve is adjusted to the first target opening degree from the closed state, the opening degree of the bypass throttle valve is adjusted to the second target opening degree, the opening degree of the reactor-out stop valve is used for adjusting the gas flow of the reactor-out stop valve, and the opening degree of the bypass throttle valve is used for adjusting the gas flow of the bypass throttle valve; the second target opening degree is in negative correlation with the first target opening degree, so that surge of the compressor is avoided.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a method and device for determining an opening degree and a vehicle. Background Art

[0002] During the operation of a vehicle, air needs to be introduced into a fuel cell through a compressor so that the fuel cell can convert chemical energy into electrical energy through an electrochemical reaction to supply power to the vehicle. In this process, if oxygen in the air mixes with hydrogen in the fuel cell, an explosion may occur.

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

[0004] The above methods can avoid the mixing of oxygen in the air and hydrogen in the fuel cell, but the above methods do not consider introducing air into the stack of the fuel cell for electrochemical reaction after purging, which may cause the compressor to surge. Therefore, how to avoid compressor surge has become an urgent problem to be solved currently. Summary of the Invention

[0005] This application provides a method and device for determining an opening degree and a vehicle to at least solve the technical problem that the compressor may surge in the related art.

[0006] According to the first aspect provided by this application, this application provides a method for determining an opening degree, which includes: when the exhaust of the hydrogen chamber of the fuel cell is completed, obtaining reaction demand information of the fuel cell, where the reaction demand information is used to indicate the gas parameters required for the fuel cell to convert chemical energy into electrical energy. Wherein, during the exhaust process of the hydrogen chamber, the outlet 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. Based on the reaction demand information, adjust the outlet shut-off valve from the closed state to a first target opening degree, and adjust the opening degree of the bypass throttle valve 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 a possible implementation manner, the reaction demand information includes: flow demand information and pressure demand information. The flow demand information is used to indicate the gas flow required for the fuel cell to convert chemical energy into electrical energy, and the pressure demand information is used to indicate 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 the closed state to the first target opening degree, and adjusting the opening degree of the bypass throttle valve to the second target opening degree, includes: obtaining the first target opening degree based on the flow demand information and the pressure demand information. Adjusting the outlet shut-off valve from the closed state to the first target opening degree. Obtaining the second target opening degree based on the first target opening degree and the flow demand information. Adjusting the opening degree of the bypass throttle valve to the second target opening degree.

[0008] In a possible implementation manner, the flow demand information includes: the flow demand of the inlet shut-off valve in the fuel cell, and the pressure demand information includes the pressure demand of the inlet shut-off valve. Obtaining the first target opening degree based on the flow demand information and the pressure demand information includes: obtaining the first correspondence relationship, where the first correspondence relationship includes: the correspondence relationship between multiple first preset opening degrees of the outlet shut-off valve and multiple preset inlet gas information. One first preset opening degree corresponds to one preset inlet gas information, and the preset inlet gas information includes: preset inlet gas flow and preset inlet gas pressure. Obtaining the first target opening degree based on the first correspondence relationship, the flow demand of the inlet shut-off valve, and the pressure demand of the inlet shut-off valve.

[0009] In a possible implementation manner, obtaining the first target opening degree based on the first correspondence relationship, the flow demand of the inlet shut-off valve, and the pressure demand of the inlet shut-off valve includes: determining the target rotational speed of the compressor in the fuel cell based on the flow demand of the inlet shut-off valve and the pressure demand of the inlet shut-off valve. When the compressor maintains the target rotational speed, obtaining the first target opening degree based on the first correspondence relationship, the flow demand of the inlet shut-off valve, and the pressure demand of the inlet shut-off valve.

[0010] In a possible implementation manner, the flow demand information includes: the flow demand of the outlet shut-off valve. Obtaining the second target opening degree based on the first target opening degree and the flow demand information includes: obtaining the current ambient air pressure. When the current ambient air pressure is less than or equal to the preset air pressure threshold, obtaining the second correspondence relationship, where the second correspondence relationship includes: the correspondence relationship between multiple second preset opening degrees of the bypass throttle valve and multiple first preset opening degree information. One second preset opening degree corresponds to one first preset opening degree information, and the first preset opening degree information includes: the first preset opening degree and the preset total flow. Obtaining the target flow demand based on the flow demand of the inlet shut-off valve and the flow demand of the outlet shut-off valve. Obtaining the second target opening degree based on the second correspondence relationship, the first target opening degree, and the target flow demand.

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

[0012] In a possible implementation manner, adjusting the outgoing stack shut-off valve from the closed state to the first target opening degree includes: determining the opening degree change rate of the outgoing stack shut-off valve based on the first target opening degree. Based on the opening degree change rate, adjusting the outgoing stack shut-off valve from the closed state to the first target opening degree.

[0013] In a possible implementation manner, the opening degree determination method further includes: obtaining an incoming stack flow rate difference and a bypass flow rate difference, where the incoming stack flow rate difference is the difference between the flow rate requirement of the incoming stack shut-off valve and the current flow rate of the incoming stack 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. When the incoming stack 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, stop adjusting the opening degree of the outgoing stack shut-off valve and the opening degree of the bypass throttle valve.

[0014] In a possible implementation manner, the opening degree determination method further includes: obtaining the flow rate requirement of the incoming stack shut-off valve in the fuel cell and the current flow rate of the bypass throttle valve. When the flow rate requirement of the incoming stack 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, it is determined that the hydrogen chamber has completed exhaust.

[0015] According to the second aspect provided by the present application, there is provided an opening degree determination device, where the device includes an acquisition module and a processing module. The acquisition module is configured to obtain reaction requirement information of the fuel cell when the hydrogen chamber of the fuel cell has completed exhaust, and the reaction requirement information is used to indicate the gas parameters required for the fuel cell to convert chemical energy into electrical energy. Wherein, during the exhaust process of the hydrogen chamber, the outgoing stack shut-off valve in the fuel cell is in the closed state, and the bypass throttle valve in the fuel cell is in the open state. The processing module is configured to adjust the outgoing stack shut-off valve from the closed state to a first target opening degree and adjust the opening degree of the bypass throttle valve to a second target opening degree based on the reaction requirement information. The opening degree of the outgoing stack shut-off valve is used to adjust the gas flow rate of the outgoing stack 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 a possible implementation manner, the reaction demand information includes: flow demand information and pressure demand information. The flow demand information is used to indicate the gas flow required for the fuel cell to convert chemical energy into electrical energy, and the pressure demand information is used to indicate the gas pressure required for the fuel cell to convert chemical energy into electrical energy. The processing module is configured to obtain a first target opening degree based on the flow demand information and the pressure demand information. The processing module is further configured to adjust the outlet shut-off valve from the 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 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 a possible implementation manner, the flow demand information includes the flow demand of the inlet shut-off valve in the fuel cell, and the pressure demand information includes the pressure demand of the inlet shut-off valve. The obtaining module is configured to obtain a first corresponding relationship, where the first corresponding relationship includes the corresponding relationship between multiple first preset opening degrees of the outlet shut-off valve and multiple preset inlet gas information. One first preset opening degree corresponds to one preset inlet gas information, and the preset inlet gas information includes: preset inlet gas flow and preset inlet gas pressure. The processing module is configured to obtain a first target opening degree based on the first corresponding relationship, the flow demand of the inlet shut-off valve, and the pressure demand of the inlet shut-off valve.

[0018] In a possible implementation manner, the processing module is configured to determine the target speed of the compressor in the fuel cell based on the flow demand of the inlet shut-off valve and the pressure demand of the inlet shut-off valve. The processing module is further configured to obtain a first target opening degree based on the first corresponding relationship, the flow demand of the inlet shut-off valve, and the pressure demand of the inlet shut-off valve when the compressor maintains the target speed.

[0019] In a possible implementation manner, the flow demand information includes the flow demand of the outlet shut-off valve. The obtaining module is configured to obtain the current ambient air pressure. The obtaining module is further configured to obtain a second corresponding relationship when the current ambient air pressure is less than or equal to a preset air pressure threshold. The second corresponding relationship includes the corresponding relationship between multiple second preset opening degrees of the bypass throttle valve and multiple first preset opening degree information. One second preset opening degree corresponds to one first preset opening degree information, and the first preset opening degree information includes: the first preset opening degree and the preset total flow. The processing module is configured to obtain a target flow demand based on the flow demand of the inlet shut-off valve and the flow demand of the outlet shut-off valve. The processing module is further configured to obtain a second target opening degree based on the second corresponding relationship, the first target opening degree, and the target flow demand.

[0020] In a possible implementation, an acquisition module is configured to obtain a third correspondence when the current ambient air pressure is greater than a preset air pressure threshold. The 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, and the second preset opening degree information includes: a first preset opening degree and a preset inlet gas flow rate. A processing module is configured to obtain a second target opening degree based on the third correspondence, the first target opening degree, and the flow rate requirement of the inlet shut-off valve.

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

[0022] In a possible implementation, an acquisition module is configured to obtain an inlet flow rate difference and a bypass flow rate difference. The inlet flow rate difference is the difference between the flow rate requirement of the inlet shut-off valve and the current flow rate of the inlet 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. The processing module is configured to stop adjusting the opening degree of the outlet shut-off valve and the opening degree of the bypass throttle valve when the inlet 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 a possible implementation, an acquisition module is configured to obtain the flow rate requirement of the inlet shut-off valve in the fuel cell and the current flow rate of the bypass throttle valve. The processing module is configured to determine that the hydrogen chamber has completed exhaust when the flow rate requirement of the inlet 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.

[0024] According to a third aspect of the present application, an opening degree determination device is provided, including: a processor; a memory for storing instructions executable by the processor; wherein, the processor is configured to execute the instructions to implement the method according to the first aspect and any possible implementation thereof.

[0025] According to a fourth aspect of the present application, a vehicle is provided. The vehicle includes the opening degree determination device according to the second aspect, and the vehicle is configured to implement the method according to the first aspect and any possible implementation thereof as described above.

[0026] Advantages of the present invention: During the process of exhausting the hydrogen chamber, the outlet shut-off valve in the fuel cell is in the closed state, and the bypass throttle valve in the fuel cell is in the open state, which can discharge the impurities in the hydrogen chamber. When the exhaust of the hydrogen chamber of the fuel cell is completed, by obtaining the reaction demand information of the fuel cell and adjusting the outlet shut-off valve from the closed state to the first target opening degree and adjusting the opening degree of the bypass throttle valve to the second target opening degree based on the reaction demand information, the gas flow inside the fuel cell can be regulated. Since the opening degree of the outlet shut-off valve can be used to adjust the gas flow of the outlet shut-off valve, and the opening degree of the bypass throttle valve can be used to adjust the gas flow of the bypass throttle valve, and the second target opening degree is negatively correlated with the first target opening degree, in this way, the gas flow balance inside the fuel cell can be achieved, and the compressor in the fuel cell can be prevented from surging. Further, by adjusting the opening degrees of the outlet shut-off valve and the bypass throttle valve through the reaction demand information, while adjusting the gas flow of the outlet shut-off valve and the gas flow of the bypass throttle valve, the fuel cell can convert chemical energy into electrical energy and thus output electric power.

[0027] (2)The stack generates electric energy through the chemical reaction of gas. The flow demand information can provide sufficient reaction gas for the stack, and the pressure demand information can affect the chemical reaction rate of the stack. Therefore, based on the flow demand information and the pressure demand information, obtaining the first target opening degree can enable the stack to carry out chemical reactions normally while avoiding compressor surging. Based on the first target opening degree and the flow demand information, obtaining the second target opening degree can enable the bypass throttle valve and the outlet shut-off valve to act in coordination. In this way, when increasing the opening degree of the outlet shut-off valve, the opening degree of the bypass throttle valve can be reduced, thereby adjusting the air flow distribution in the fuel cell, further avoiding violent fluctuations in pressure and flow, maintaining a stable working condition, and preventing the compressor from surging.

[0028] (3)By obtaining the first corresponding relationship, the corresponding relationship between multiple first preset opening degrees of the outlet shut-off valve and multiple preset inlet gas information can be obtained when the compressor does not surge. In this way, the first target opening degree obtained through the first corresponding relationship, the flow demand of the inlet shut-off valve, and the pressure demand of the inlet shut-off valve can ensure that the compressor does not surge.

[0029] (4)When the compressor maintains the target speed, the rotor of the compressor always runs at a single speed, which can make the mechanical vibration frequency stable, avoid the shafting resonance interval, and reduce the risk of vibration faults. Further, when the compressor maintains the target speed, without complex variable frequency speed regulation control, only by adjusting the opening degrees of the outlet shut-off valve and the bypass throttle valve, while meeting the reaction conditions of the stack, the control logic complexity and equipment cost can be reduced, and the compressor can be prevented from surging.

[0030] When 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 plateau area. Since the air pressure in the plateau area is relatively low while the air pressure inside the fuel cell is relatively high, it is necessary to bypass the throttle valve to assist the inlet stack stop valve and the outlet stack stop valve to discharge gas, reducing the air pressure difference inside and outside the fuel cell, so as to avoid compressor surge caused by large fluctuations in the gas inside the fuel cell.

[0031] When the current ambient air pressure is greater than the preset air pressure threshold, it indicates that the fuel cell is in a plain area. Since the air pressure in the plain area is relatively high and is relatively close to the air pressure inside the fuel cell. Therefore, during the reaction process of the fuel cell, only by considering the gas flow rate through the inlet stack stop valve and the influence of the opening degree of the outlet stack stop valve on the gas inside the fuel cell, the opening degree of the bypass throttle valve can be obtained, so that during the process of the fuel cell switching from purging and removing impurities in the hydrogen chamber to power generation of the fuel cell, the internal air flow and air pressure of the fuel cell are stable, avoiding periodic oscillation inside the compressor.

[0032] During the process of the change in the opening degree of the outlet stack stop valve, the change rate of the opening degree of the outlet stack stop valve will also affect the pressure and flow rate of the compressor. Therefore, by setting the change rate of the opening degree and based on the change rate of the opening degree, adjusting the outlet stack stop valve from the closed state to the first target opening degree can maintain the air pressure balance and air flow balance inside the fuel cell, thus avoiding periodic oscillation of the air flow inside the compressor.

[0033] When the difference in the inlet stack flow rate is less than or equal to the first preset flow rate difference, and / or the difference in the 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 inlet stack stop valve has approached the flow rate requirement of the inlet stack stop valve, and the opening degree of the outlet stack stop valve has been adjusted to the first target opening degree, and the opening degree of the bypass throttle valve has been adjusted to the second target opening degree. That is to say, the actual gas flow rate through the inlet stack stop valve has met the conditions for the chemical reaction of the fuel cell stack. At this time, stopping the adjustment of the opening degree of the outlet stack stop valve and the opening degree of the bypass throttle valve can reduce resource consumption.

[0034] (9) When the flow rate requirement of the inlet stack stop valve changes from 0 to greater than the first preset flow rate threshold, it indicates that the fuel cell is about to undergo a chemical reaction through the fuel cell stack. When the current flow rate of the bypass throttle valve is greater than the second preset flow rate threshold, it indicates that the flow rate entering the compressor increases, and the fuel cell is about to undergo a chemical reaction through the fuel cell stack. At this time, it can be determined that the hydrogen chamber has completed exhaust, and the opening degree of the outlet stack stop valve and the opening degree of the bypass throttle valve can be adjusted to prevent the compressor from surging during the process of the fuel cell switching from purging and removing impurities in the hydrogen chamber to power generation of the fuel cell.

[0035] It should be noted that for the technical effects brought by any of the implementation manners in the second aspect to the fourth aspect, reference may be made to the technical effects brought by the corresponding implementation manner in the first aspect, which will not be elaborated herein.

[0036] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application, and do not constitute an improper limitation to this application.

[0038] Figure 1 is a schematic structural diagram of a fuel cell system shown according to an exemplary embodiment; Figure 2 is a schematic flowchart of a method for determining an opening degree shown according to an exemplary embodiment; Figure 3 is a schematic structural diagram of a device for determining an opening degree shown according to an exemplary embodiment; Figure 4 is a schematic structural diagram of another device for determining an opening degree shown according to an exemplary embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] In order to enable those of ordinary skill 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 drawings.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with this application. On the contrary, they are merely examples of devices and methods consistent with some aspects of this application as detailed in the appended claims.

[0041] The present application provides a method for determining the opening degree. In this method, during the process of exhausting the hydrogen chamber, the outlet shut-off valve in the fuel cell is in the closed state, and the bypass throttle valve in the fuel cell is in the open state, which can discharge impurities in the hydrogen chamber. When the exhaust of the hydrogen chamber of the fuel cell is completed, by obtaining the reaction demand information of the fuel cell and adjusting the outlet shut-off valve from the closed state to the first target opening degree based on the reaction demand information, and adjusting the opening degree of the bypass throttle valve to the second target opening degree, the gas flow inside the fuel cell can be regulated. Since the opening degree of the outlet shut-off valve can be used to adjust the gas flow of the outlet shut-off valve, and the opening degree of the bypass throttle valve can be used to adjust the gas flow of the bypass throttle valve, and the second target opening degree is negatively correlated with the first target opening degree, in this way, the gas flow balance inside the fuel cell can be achieved, and the compressor in the fuel cell can be prevented from surging. Further, by adjusting the opening degrees of the outlet shut-off valve and the bypass throttle valve through the reaction demand information, while regulating the gas flow of the outlet shut-off valve and the gas flow of the bypass throttle valve, the fuel cell can convert chemical energy into electrical energy and thus output electric power.

[0042] It should be noted that the execution subject of the opening degree determination method provided by the present application can be an opening degree determination device, which can be a fuel cell system or a vehicle. At the same time, the device can also be the Central Processing Unit (CPU) of the vehicle, or the module for determining the opening degree in the device, or the vehicle-mounted device in the vehicle. The present application does not limit this. In the embodiments of the present application, taking the vehicle as an example of executing the opening degree determination method, the opening degree determination method provided by the embodiments of the present application is described.

[0043] The implementation environment of the embodiments of the present application is introduced below.

[0044] Exemplarily, as Figure 1 shown, it shows a fuel cell system. The fuel cell system includes: a fuel cell control system and an air subsystem. Among them, the air subsystem includes: an air filter, a flow meter, a compressor, an intercooler, a temperature sensor, a first pressure sensor, an inlet shut-off valve, a fuel cell stack, an outlet shut-off valve, a bypass throttle valve, a second pressure sensor, and a muffler.

[0045] Among them, the air filter is used to filter the gas entering the compressor.

[0046] The flow meter is used to measure the flow rate of the filtered gas.

[0047] The compressor is used to compress the filtered gas.

[0048] The intercooler is used to cool the gas whose temperature rises during the compression process of the compressor.

[0049] A temperature sensor for measuring the temperature of the gas flowing through the inlet reactor shut-off valve.

[0050] A first pressure sensor for measuring the pressure of the gas flowing through the inlet reactor shut-off valve.

[0051] An inlet reactor shut-off valve for regulating the flow rate and pressure of the inlet reactor air.

[0052] A fuel cell stack for outputting electric power through an electrochemical reaction of hydrogen and oxygen.

[0053] An outlet reactor shut-off valve for regulating the flow rate and pressure of the outlet reactor air.

[0054] A bypass throttle valve for regulating the flow rate and pressure of the bypass air.

[0055] A second pressure sensor for measuring the pressure of the gas flowing through the bypass throttle valve.

[0056] A muffler for reducing the noise generated during the operation of the fuel cell system.

[0057] It should be noted that this application places no restrictions on the compressor. For example, the compressor can be an air compressor.

[0058] Optionally, the flow meter is connected between the air filter and the compressor, the temperature sensor is connected between the inlet reactor shut-off valve and the intercooler, the first pressure sensor is located at the inlet of the inlet reactor shut-off valve, and the second pressure sensor is located at the outlet of the bypass throttle valve.

[0059] It should be noted that when the fuel cell system is started, in order to ensure the purity of the reaction gas in the hydrogen chamber of the fuel cell stack, it is necessary to perform purge first. At this time, the air subsystem can control the opening degree of the bypass throttle valve, and then regulate the air flow rate flowing through the bypass throttle valve, so that the hydrogen concentration of the tail exhaust gas is within the safety threshold.

[0060] In a possible design, the inlet reactor shut-off valve and the outlet reactor shut-off valve are in a closed state. The fuel cell control system can control the bypass throttle valve 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 the compressor according to the 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. After that, the cooled air flows through the bypass throttle valve and the muffler, mixes with the gas on the anode side of the fuel cell stack, and then is discharged from the fuel cell system.

[0061] It should be noted that whether the flow rate and pressure requirements are met are determined by the feedback values of the flow meter, the first pressure sensor, and the second pressure sensor.

[0062] It should be noted that after the fuel cell system purges impurities, the fuel cell system starts to prepare for power generation. At this time, the bypass throttle valve gradually closes, and the inlet stack isolation valve and the outlet stack isolation valve slowly open. Air needs to be introduced into the air chamber of the stack, and after the fuel cell system builds voltage, the current is controlled to generate electricity.

[0063] To avoid compressor surge during this process, the traditional method is to first close the compressor and the bypass valve. After determining that there is no risk of compressor surge, the outlet stack isolation valve is opened, and the compressor is requested to operate after the actual opening of the outlet isolation valve is greater than a certain threshold. However, this method increases the start-stop process of the compressor, affecting the service life of the air bearings of the compressor. Moreover, it causes a relatively long system startup response process, affecting the power generation time of the fuel cell.

[0064] Therefore, the opening of the outlet stack isolation valve and the opening of the bypass throttle valve can be controlled by the fuel cell control system to avoid compressor surge.

[0065] In a possible design, the fuel cell system can obtain the system power generation demand, the current ambient temperature, and the current ambient air pressure. Then, the fuel cell control system can calculate based on the system power generation demand to obtain the flow demand and pressure demand of the inlet stack isolation valve. The fuel cell control system can calculate based on the current ambient air pressure to obtain the flow demand of the bypass throttle valve. The fuel cell control system can measure the current flow of the bypass throttle valve through a second pressure sensor. When the flow demand of the inlet stack isolation 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.

[0066] After that, the fuel cell control system can calculate based on the current ambient temperature, the current ambient air pressure, the flow demand of the bypass throttle valve, the flow demand of the inlet stack isolation valve, and the pressure demand of the inlet stack isolation valve to obtain the total flow demand and the target speed of the compressor, and control the compressor to operate based on the total flow demand and the target speed. Then, the fuel cell control system can obtain the first target opening of the outlet stack isolation valve based on the flow demand of the inlet stack isolation valve, the pressure demand of the inlet stack isolation valve, and the first corresponding relationship, and determine the opening change rate of the outlet stack isolation valve based on the first target opening. Then, the fuel cell control system can adjust the outlet stack isolation valve from the closed state to the first target opening based on the opening change rate. Then, the fuel cell control system can obtain the second target opening based on the second corresponding relationship, the first target opening, and the target flow demand. Then, the fuel cell control system can adjust the opening of the bypass throttle valve to the second target opening.

[0067] After that, the fuel cell control system can obtain the difference between the inlet stack flow rate and the bypass flow rate difference. The difference between the inlet stack flow rate is the difference between the flow rate demand of the inlet stack shut-off valve and the current flow rate of the inlet stack shut-off valve. The bypass flow rate difference is the difference between the flow rate demand of the bypass throttle valve and the current flow rate of the bypass throttle valve. If the difference between the inlet stack flow rate is less than or equal to the first preset flow rate difference, and / or the bypass flow rate difference is less than or equal to the second preset flow rate difference, then the fuel cell control system can stop adjusting the opening degree of the outlet stack shut-off valve and the opening degree of the bypass throttle valve. If the difference between the inlet stack flow rate is greater than the first preset flow rate difference, and the bypass flow rate difference is greater than the second preset flow rate difference, then the fuel cell control system continues to adjust the outlet stack shut-off valve from the closed state to the first target opening degree, and adjusts the opening degree of the bypass throttle valve to the second target opening degree.

[0068] It should be noted that the first corresponding relationship is the corresponding relationship between multiple first preset opening degrees of the outlet stack shut-off valve under the standard working conditions calibrated in advance and multiple preset inlet gas information. One first preset opening degree corresponds to one preset inlet gas information. The preset inlet gas information includes: preset inlet gas flow rate and preset inlet gas pressure. The second corresponding relationship is the opening degree characteristics of the outlet stack shut-off valve and the bypass throttle valve under the standard working conditions calibrated in advance.

[0069] It should be noted that this application does not limit the standard working conditions. For example, the standard working conditions can be 0 degrees Celsius (°C) and 1 standard atmosphere (atm).

[0070] It should be noted that the fuel cell control system can collect the feedback signal values of the flow meter, the first pressure sensor, the temperature sensor, and the second pressure sensor through the wire harness.

[0071] In this way, based on the analysis of the response process of the air system during the startup process of the fuel cell system, combined with the influence of the opening degree of the outlet stack shut-off valve and the opening degree of the bypass throttle valve on the system flow resistance characteristics, the opening of the outlet stack shut-off valve can be smoothly controlled, the bypass throttle valve can be closed, and compressor surge can be avoided. And when the fuel cell system starts up, the compressor can still operate normally, thereby improving the system response speed and increasing the service life of the compressor.

[0072] For the convenience of understanding, the following specifically introduces the opening degree determination method provided by this application in combination with the drawings.

[0073] As Figure 2 shown, the opening degree determination method includes: S201. When the exhaust of the hydrogen chamber of the fuel cell is completed, obtain the reaction demand information of the fuel cell.

[0074] In an embodiment of the present application, during the process of exhausting the hydrogen chamber, the outlet shut-off valve in the fuel cell is in the closed state, and the bypass throttle valve in the fuel cell is in the open state.

[0075] Among them, the reaction demand information is used to indicate the gas parameters required for the fuel cell to convert chemical energy into electrical energy.

[0076] Optionally, the reaction demand information includes: flow demand information and pressure demand information. The flow demand information is used to indicate the gas flow required for the fuel cell to convert chemical energy into electrical energy, and the pressure demand information is used to indicate the gas pressure required for the fuel cell to convert chemical energy into electrical energy.

[0077] In a possible design, the flow demand information includes: the flow demand of the inlet shut-off valve in the fuel cell and the flow demand of the outlet shut-off valve, and the pressure demand information includes the pressure demand of the inlet shut-off valve.

[0078] S202. Based on the reaction demand information, adjust the outlet shut-off valve from the closed state to the first target opening degree.

[0079] Among them, the opening degree of the outlet shut-off valve is used to adjust the gas flow of the outlet shut-off valve.

[0080] In a possible implementation manner, the first target opening degree can be obtained based on the flow demand information and the pressure demand information. Then, the outlet shut-off valve can be adjusted from the closed state to the first target opening degree.

[0081] It should be noted that when the outlet shut-off valve and the inlet shut-off valve are not opened or the opening angle is too small, if the bypass throttle valve is closed or the opening angle is too small, the gas flow in the system will suddenly decrease, resulting in a pressure drop, which may be lower than the surge threshold of the compressor, thereby causing compressor surge.

[0082] It can be understood that the stack generates electrical energy through the chemical reaction of gas. The flow demand information can provide sufficient reaction gas for the stack, and the pressure demand information can affect the chemical reaction rate of the stack. Therefore, based on the flow demand information and the pressure demand information, obtaining the first target opening degree can enable the stack to carry out chemical reactions normally while avoiding compressor surge.

[0083] Optionally, a first correspondence can be obtained. The first correspondence includes: the correspondence between multiple first preset opening degrees of the outlet shut-off valve and multiple preset inlet gas information. One first preset opening degree corresponds to one preset inlet gas information. The preset inlet gas information includes: preset inlet gas flow and preset inlet gas pressure. Then, based on the first correspondence, the flow demand of the inlet shut-off valve, and the pressure demand of the inlet shut-off valve, the first target opening degree is obtained.

[0084] Exemplarily, the preset inlet gas flow rate 1 is 25 grams per second (g / s), the preset inlet gas pressure 1 is 170 kilopascals (kPa), and the first preset opening 1 is 25%; the preset inlet gas flow rate 2 is 27 g / s, the preset inlet gas pressure 2 is 270 kPa, and the first preset opening 2 is 28%; the preset inlet gas flow rate 3 is 27 g / s, the preset inlet gas pressure 3 is 300 kPa, and the first preset opening 3 is 30%. If the flow rate demand of the inlet shut-off valve is 27 g / s and the pressure demand of the inlet shut-off valve is 300 kPa, then the first target opening is 30%.

[0085] It should be noted that when both the outlet shut-off valve and the bypass throttle valve are open, in some scenarios, the compressor may still surge.

[0086] It can be understood that by obtaining the first correspondence relationship, the correspondence relationship between multiple first preset openings of the outlet shut-off valve and multiple preset inlet gas information can be obtained when the compressor does not surge. In this way, the first target opening obtained through the first correspondence relationship, the flow rate demand of the inlet shut-off valve, and the pressure demand of the inlet shut-off valve can ensure that the compressor does not surge.

[0087] Optionally, the target speed of the compressor in the fuel cell can be determined based on the flow rate demand of the inlet shut-off valve and the pressure demand of the inlet shut-off valve. Then, when the compressor maintains the target speed, the first target opening is obtained based on the first correspondence relationship, the flow rate demand of the inlet shut-off valve, and the pressure demand of the inlet shut-off valve.

[0088] Specifically, the current ambient air pressure and the current ambient temperature can be obtained. Then, data processing can be performed based on the current ambient air pressure, the current ambient temperature, and the pressure demand of the inlet shut-off valve to obtain the target speed of the compressor.

[0089] It should be noted that during dynamic processes such as vehicle acceleration and deceleration, parameters such as the speed, flow rate, and pressure ratio of the air compressor will change rapidly. If the speed of the compressor changes, components such as the impeller and bearing of the compressor need to bear the alternating stress caused by the speed change. In this way, it may cause premature wear of components such as mechanical seals and couplings. And it may cause the compressor to surge.

[0090] It can be understood that when the compressor maintains the target speed, the rotor of the compressor always operates at a single speed, which can make the mechanical vibration frequency stable, avoid the shafting resonance interval, and reduce the risk of vibration faults. Further, when the compressor maintains the target speed, there is no need for complex variable frequency speed control. By only adjusting the openings of the outlet shut-off valve and the bypass throttle valve, the control logic complexity and equipment cost can be reduced while meeting the reaction conditions of the fuel cell, and compressor surging can be avoided.

[0091] S203. Adjust the opening degree of the bypass throttle valve to the second target opening degree.

[0092] Wherein, 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.

[0093] In a possible implementation manner, the second target opening degree can be obtained based on the first target opening degree and the flow demand information. Then, the opening degree of the bypass throttle valve can be adjusted to the second target opening degree.

[0094] It can be understood that obtaining the second target opening degree based on the first target opening degree and the flow demand information can enable the bypass throttle valve and the outlet stack shut-off valve to act in coordination. In this way, when increasing the opening degree of the outlet stack shut-off valve, the opening degree of the bypass throttle valve can be reduced, so as to adjust the air flow distribution in the fuel cell, and further avoid drastic fluctuations in pressure and flow rate, maintain a stable working condition, and avoid compressor surge.

[0095] In a possible design, the current ambient air pressure can be obtained. Then, when the current ambient air pressure is less than or equal to the preset air pressure threshold, obtain the second corresponding relationship. The second corresponding relationship includes: the corresponding relationship between multiple second preset opening degrees of the bypass throttle valve and multiple first preset opening degree information. 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, the target flow demand can be obtained based on the flow demand of the inlet stack shut-off valve and the flow demand of the outlet stack shut-off valve. Then, the second target opening degree can be obtained based on the second corresponding relationship, the first target opening degree, and the target flow demand.

[0096] It can be understood that when 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 plateau area. Since the air pressure in the plateau area is relatively low and the air pressure inside the fuel cell is relatively high, the bypass throttle valve is required to assist the inlet stack shut-off valve and the outlet stack shut-off valve to discharge gas, reduce the air pressure difference inside and outside the fuel cell, and thus avoid compressor surge caused by large fluctuations in the gas inside the fuel cell.

[0097] In another possible design, when the current ambient air pressure is greater than the preset air pressure threshold, obtain the third corresponding relationship. The third corresponding relationship includes: the corresponding relationship between multiple second preset opening degrees and multiple second preset opening degree information. One second preset opening degree corresponds to one second preset opening degree information. The second preset opening degree information includes: the first preset opening degree and the preset inlet gas flow rate. Then, the second target opening degree can be obtained based on the third corresponding relationship, the first target opening degree, and the flow demand of the inlet stack shut-off valve.

[0098] It can be understood that when the current ambient air pressure is greater than the preset air pressure threshold, it indicates that the fuel cell is in a plain area. Since the air pressure in the plain area is relatively high and is relatively close to the air pressure inside the fuel cell. Therefore, during the reaction of the fuel cell, by only considering the gas flow rate through the inlet stack shut-off valve and the influence of the opening degree of the outlet stack shut-off valve on the gas inside the fuel cell, the opening degree of the bypass throttle valve can be obtained, so that during the process of the fuel cell switching from purging and removing impurities from the hydrogen chamber to generating electricity, the air flow and air pressure inside the fuel cell are stable, and periodic oscillation inside the compressor is avoided.

[0099] Based on the above technical solution, during the process of exhausting the hydrogen chamber, the outlet stack shut-off valve in the fuel cell is in the closed state, and the bypass throttle valve in the fuel cell is in the open state, which can discharge the impurities in the hydrogen chamber. When the exhaust of the hydrogen chamber of the fuel cell is completed, by obtaining the reaction demand information of the fuel cell and adjusting the outlet stack shut-off valve from the closed state to the first target opening degree and adjusting the opening degree of the bypass throttle valve to the second target opening degree based on the reaction demand information, the gas flow rate inside the fuel cell can be adjusted. Since the opening degree of the outlet stack shut-off valve can be used to adjust the gas flow rate of the outlet stack shut-off valve, 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, in this way, the gas flow rate balance inside the fuel cell can be achieved, and surging of the compressor in the fuel cell can be avoided. Further, by adjusting the opening degrees of the outlet stack shut-off valve and the bypass throttle valve through the reaction demand information, while adjusting the gas flow rate of the outlet stack shut-off valve and the gas flow rate of the bypass throttle valve, the fuel cell can convert chemical energy into electrical energy and thus output electric power.

[0100] It should be noted that adjusting the outlet stack shut-off valve from the closed state to the first target opening degree and adjusting the opening degree of the bypass throttle valve to the second target opening degree is a changing process.

[0101] In some embodiments, the opening degree change rate of the outlet stack shut-off valve can be determined based on the first target opening degree. Then, based on the opening degree change rate, the outlet stack shut-off valve can be adjusted from the closed state to the first target opening degree.

[0102] It can be understood that during the process of the change of the opening degree of the outlet stack shut-off valve, the opening degree change rate of the outlet stack shut-off valve will also affect the pressure and flow rate of the compressor. Therefore, by setting the opening degree change rate and adjusting the outlet stack shut-off valve from the closed state to the first target opening degree based on the opening degree change rate, the air pressure balance and air flow balance inside the fuel cell can be maintained, thus avoiding periodic oscillation of the air flow inside the compressor.

[0103] It should be understood that after obtaining the first target opening degree, the opening degree of the out-of-pile cutoff 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.

[0104] In some embodiments, the current opening degree of the out-of-pile cutoff valve can be obtained. Then, based on the current opening degree of the out-of-pile cutoff valve and the second corresponding relationship, the target change 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 change opening degree. Then, the updated current opening degree of the out-of-pile cutoff valve can be obtained, and based on the updated current opening degree of the out-of-pile cutoff valve and the second corresponding relationship, the updated target change opening degree can be obtained. Then, the opening degree of the bypass throttle valve can be adjusted to the updated target change opening degree. This iteration is carried out until the current opening degree of the out-of-pile cutoff valve is adjusted to the first target opening degree.

[0105] It should be understood that when the current opening degree of the out-of-pile cutoff valve is adjusted to the first target opening degree, the updated target change opening degree is the second target opening degree.

[0106] It should be noted that adjusting the actual gas flow rate flowing through the in-pile cutoff valve to the flow rate requirement of the in-pile cutoff valve is a changing process. Similarly, adjusting the actual gas flow rate flowing through the bypass throttle valve to the flow rate requirement of the bypass throttle valve is also a changing process. When the total flow rate remains unchanged, there is an associated relationship among the actual gas flow rate flowing through the in-pile cutoff valve, the actual gas flow rate flowing through the bypass throttle valve, the opening degree of the out-of-pile cutoff valve, and the opening degree of the bypass throttle valve. If the current opening degree of the out-of-pile cutoff 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 flowing through the in-pile cutoff valve has not reached the flow rate requirement of the in-pile cutoff valve, and the actual gas flow rate flowing through the bypass throttle valve has not reached the flow rate requirement of the bypass throttle valve.

[0107] That is to say, if the actual gas flow rate flowing through the in-pile cutoff valve reaches the flow rate requirement of the in-pile cutoff valve, and / or the actual gas flow rate flowing through the bypass throttle valve reaches the flow rate requirement of the bypass throttle valve, it means that the opening degree of the out-of-pile cutoff valve has reached the first target opening degree and the opening degree of the bypass throttle valve has reached the second target opening degree.

[0108] In some embodiments, the in-pile flow difference and the bypass flow difference can be obtained. The in-pile flow difference is the difference between the flow rate requirement of the in-pile cutoff valve and the current flow rate of the in-pile cutoff valve, and the bypass flow 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, when the in-pile flow difference is less than or equal to the first preset flow difference, and / or the bypass flow difference is less than or equal to the second preset flow difference, stop adjusting the opening degree of the out-of-pile cutoff valve and the opening degree of the bypass throttle valve.

[0109] It can be understood that when the difference in the incoming stack flow rate is less than or equal to the first preset flow rate difference, and / or the difference in the 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 incoming stack shut-off valve has approached the flow rate requirement of the incoming stack shut-off valve, and the opening degree of the outgoing stack shut-off valve has been adjusted to the first target opening degree, and the opening degree of the bypass throttle valve has been adjusted to the second target opening degree. That is to say, the actual gas flow rate through the incoming stack shut-off valve has met the conditions for the chemical reaction in the fuel cell stack. At this time, stopping the adjustment of the opening degree of the outgoing stack shut-off valve and the opening degree of the bypass throttle valve can reduce resource consumption.

[0110] In some embodiments, the flow rate requirement of the incoming stack shut-off valve and the current flow rate of the bypass throttle valve in the fuel cell can be obtained. Then, when the flow rate requirement of the incoming stack shut-off valve is greater than the first preset flow rate threshold and the current flow rate of the bypass throttle valve is greater than the second preset flow rate threshold, it is determined that the hydrogen chamber has completed exhaust.

[0111] It can be understood that the change of the flow rate requirement of the incoming stack shut-off valve from 0 to greater than the first preset flow rate threshold indicates that the fuel cell is about to carry out a chemical reaction through the fuel cell stack. The current flow rate of the bypass throttle valve being greater than the second preset flow rate threshold indicates that the flow rate into the compressor has increased and the fuel cell is about to carry out a chemical reaction through the fuel cell stack. At this time, the hydrogen chamber can complete exhaust, and the opening degree of the outgoing stack shut-off valve and the opening degree of the bypass throttle valve can be adjusted, so that the compressor will not surge during the process of the fuel cell switching from hydrogen chamber impurity purge to fuel cell power generation.

[0112] The above mainly introduces the solution provided by the embodiments of the present application from the perspective of methods. To implement the above functions, the opening degree determination device includes the corresponding hardware structure and / or software module for executing each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0113] The embodiments of the present application can divide the function modules of the opening degree determination device according to the above methods. For example, the opening degree determination device can include each function module corresponding to each function division, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of a software function module. It should be noted that the division of modules in the embodiments of the present application is illustrative, only a logical function division, and there may be other division methods in actual implementation.

[0114] Referring to Figure 3 , the opening degree determination device includes an acquisition module 301 and a processing module 302.

[0115] The acquisition module 301 is configured to acquire reaction demand information of the fuel cell when the hydrogen chamber of the fuel cell has completed exhaust, and the reaction demand information is used to indicate the gas parameters required for the fuel cell to convert chemical energy into electrical energy. Among them, during the process of exhausting the hydrogen chamber, the outlet shut-off valve in the fuel cell is in the closed state, and the bypass throttle valve in the fuel cell is in the open state.

[0116] The processing module 302 is configured to adjust the outlet shut-off valve from the closed state to a first target opening degree and adjust the opening degree of the bypass throttle valve 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.

[0117] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment related to the method, and will not be elaborated here.

[0118] As Figure 4 shown, the opening degree determination device includes but is not limited to: a processor 401 and a memory 402.

[0119] Among them, the above-mentioned memory 402 is used to store the executable instructions of the above-mentioned processor 401. It can be understood that the above-mentioned processor 401 is configured to execute instructions to implement the opening degree determination method in the above embodiment.

[0120] It should be noted that those skilled in the art can understand that Figure 4 the structure of the opening degree determination device shown in Figure 4 does not constitute a limitation on the opening degree determination device. The opening degree determination device may include more or fewer components than

[0121] The processor 401 is the control center of the opening degree determination device, connecting various parts of the entire opening degree determination device through various interfaces and lines. By running or executing software programs and / or modules stored in the memory 402, and by invoking the data stored in the memory 402, it executes various functions of the opening degree determination device and processes data, thereby monitoring the entire opening degree 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. Among them, the application processor mainly processes the operating system, user interface, application programs, etc., and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor may not be integrated into the processor 401 either.

[0122] The memory 402 can be used to store software programs and various data. The memory 402 mainly includes a program storage area and a data storage area. Among them, the program storage area can store the operating system, application programs required by at least one functional module (such as the determination unit, processing unit, etc.). In addition, the memory 402 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.

[0123] In an exemplary embodiment, the present application embodiment also provides a vehicle, which includes an opening degree determination device, and the vehicle can execute to complete the method in the above embodiment through the opening degree determination device.

[0124] It should be noted that the vehicle can be, but is not limited to, a pure electric vehicle (Pure Electric Vehicle / Battery Electric Vehicle, PEV / BEV), a hybrid electric vehicle (Hybrid Electric Vehicle, HEV), a range extended electric vehicle (Range Extended Electric Vehicle, REEV), a plug-in hybrid electric vehicle (Plug-in Hybrid Electric Vehicle, PHEV), a new energy vehicle, a fuel vehicle, etc.

[0125] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as the memory 402 including instructions, and the above instructions can be executed by the processor 401 of the opening degree determination device to implement the method in the above embodiment.

[0126] In actual implementation, Figure 3 the functions of the acquisition module 301 and the processing module 302 in Figure 4The processor 401 in it calls the computer program stored in the memory 402 for implementation. For the specific execution process, reference can be made to the description of the method part in the above embodiment, which will not be elaborated here.

[0127] Optionally, the computer-readable storage medium may be a non-transitory computer-readable storage medium. For example, the non-transitory computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc read-only memory (CD-ROM), magnetic tape, a floppy disk, and an optical data storage device, etc.

[0128] In an exemplary embodiment, the present application embodiment also provides a computer program product including one or more instructions, and the one or more instructions can be executed by the processor 401 of the opening degree determination device to complete the method in the above embodiment.

[0129] It should be noted that when the instructions in the above computer-readable storage medium or the one or more instructions in the computer program product are executed by the processor of the opening degree determination device, each process of the above method embodiment is implemented, and the same technical effects as the above method can be achieved. To avoid repetition, it will not be elaborated here.

[0130] Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and conciseness of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0131] In several embodiments provided by the present application, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point, the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in electrical, mechanical or other forms.

[0132] The unit described as a separating component may or may not be physically separated. The component shown as a unit may be a single physical unit or multiple physical units, that is, it may be located in one place or may be distributed to multiple different places. Some or all of the classification units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0133] In addition, each functional unit in various embodiments of the present application may be integrated in a processing unit, may exist separately as individual physical units, or two or more units may be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0134] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on such an understanding, the technical solution of the embodiments of the present application, in essence, or the part that contributes to the prior art, or all or part of this 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 enable a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the methods in various embodiments of the present application. The aforementioned storage medium includes: USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical discs and other various media that can store program codes.

[0135] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for determining the opening degree, characterized in that, The opening degree determination method includes: When the hydrogen chamber of the fuel cell completes exhaust, obtain the reaction demand information of the fuel cell, where the reaction demand information is used to indicate the gas parameters required for the fuel cell to convert chemical energy into electrical energy; wherein, during the exhaust process of the hydrogen chamber, the outlet shut-off valve in the fuel cell is in the closed state, and the bypass throttle valve in the fuel cell is in the open state; Based on the reaction demand information, adjust the outlet shut-off valve from the closed state to a first target opening degree, and adjust the opening degree of the bypass throttle valve 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.

2. The opening degree determination method according to claim 1, characterized in that The reaction demand information includes: flow rate demand information and pressure demand information. The flow rate demand information is used to indicate the gas flow rate required for the fuel cell to convert chemical energy into electrical energy, and the pressure demand 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 outlet shut-off valve from the closed state to a first target opening degree and adjusting the opening degree of the bypass throttle valve to a second target opening degree based on the reaction demand information includes: Based on the flow rate demand information and the pressure demand information, obtain the first target opening degree; Adjust the outlet shut-off valve from the closed state to the first target opening degree; Based on the first target opening degree and the flow rate demand information, obtain the second target opening degree; Adjust the opening degree of the bypass throttle valve to the second target opening degree.

3. The opening degree determination method according to claim 2, wherein The flow rate demand information includes: the flow rate demand of the inlet shut-off valve in the fuel cell, and the pressure demand information includes the pressure demand of the inlet shut-off valve; the step of obtaining the first target opening degree based on the flow rate demand information and the pressure demand information includes: Obtain a first correspondence relationship, where the first correspondence relationship includes: the correspondence relationship between multiple first preset opening degrees of the outlet shut-off valve and multiple preset inlet gas information. One of the first preset opening degrees corresponds to one of the preset inlet gas information, and the preset inlet gas information includes: preset inlet gas flow rate and preset inlet gas pressure; Based on the first correspondence relationship, the flow rate demand of the inlet shut-off valve, and the pressure demand of the inlet shut-off valve, obtain the first target opening degree.

4. The opening degree determination method according to claim 3, characterized in that, The step of obtaining the first target opening degree based on the first correspondence relationship, the flow rate demand of the inlet shut-off valve, and the pressure demand of the inlet shut-off valve includes: Based on the flow rate demand of the inlet shut-off valve and the pressure demand of the inlet shut-off valve, determine the target rotational speed of the compressor in the fuel cell; When the compressor maintains the target rotational speed, based on the first correspondence relationship, the flow rate demand of the inlet shut-off valve, and the pressure demand of the inlet shut-off valve, obtain the first target opening degree.

5. The opening degree determination method according to claim 3, characterized in that The flow demand information includes: the flow demand of the out-of-stack cut-off valve; obtaining the second target opening based on the first target opening and the flow demand information includes: Obtain the current ambient air pressure; When the current ambient air pressure is less than or equal to a preset air pressure threshold, obtain a second correspondence relationship, where the second correspondence relationship includes: the correspondence relationship between multiple second preset openings of the bypass throttle valve and multiple first preset opening information, one of the second preset openings corresponding to one of the first preset opening information, and the first preset opening information includes: the first preset opening and the preset total flow rate; Based on the flow demand of the in-stack cut-off valve and the flow demand of the out-of-stack cut-off valve, obtain the target flow demand; Based on the second correspondence relationship, the first target opening, and the target flow demand, obtain the second target opening.

6. The opening degree determination method according to claim 5, characterized in that, The opening determination method further includes: When the current ambient air pressure is greater than the preset air pressure threshold, obtain a third correspondence relationship, where the third correspondence relationship includes: the correspondence relationship between the multiple second preset openings and multiple second preset opening information, one of the second preset openings corresponding to one of the second preset opening information, and the second preset opening information includes: the first preset opening and the preset in-stack gas flow rate; Based on the third correspondence relationship, the first target opening, and the flow demand of the in-stack cut-off valve, obtain the second target opening.

7. The opening degree determination method according to any one of claims 1-4, characterized in that, Adjusting the out-of-stack cut-off valve from the closed state to the first target opening includes: Based on the first target opening, determine the opening change rate of the out-of-stack cut-off valve; Based on the opening change rate, adjust the out-of-stack cut-off valve from the closed state to the first target opening.

8. The opening degree determination method according to any one of claims 1-4, characterized in that, The opening determination method further includes: Obtain the in-stack flow difference and the bypass flow difference, where the in-stack flow difference is the difference between the flow demand of the in-stack cut-off valve and the current flow of the in-stack cut-off valve, and the bypass flow difference is the difference between the flow demand of the bypass throttle valve and the current flow of the bypass throttle valve; When the in-stack flow difference is less than or equal to a first preset flow difference, and / or the bypass flow difference is less than or equal to a second preset flow difference, stop adjusting the opening of the out-of-stack cut-off valve and the opening of the bypass throttle valve.

9. The opening degree determination method according to any one of claims 1-4, characterized in that The opening determination method further includes: Obtain the flow demand of the in-stack cut-off valve in the fuel cell and the current flow of the bypass throttle valve; When the flow demand of the in-stack cut-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, determine that the hydrogen chamber has completed exhaust.

10. An opening degree determination device, characterized in that, The device includes an acquisition module and a processing module; The acquisition module is used to obtain the reaction demand information of the fuel cell when the hydrogen chamber of the fuel cell has completed exhaust, and the reaction demand information is used to indicate the gas parameters required for the fuel cell to convert chemical energy into electrical energy; wherein, during the exhaust process of the hydrogen chamber, the out-of-stack cut-off valve in the fuel cell is in the closed state, and the bypass throttle valve in the fuel cell is in the open state; The processing module is configured to adjust the outlet shut-off valve from the closed state to a first target opening degree and adjust the opening degree of the bypass throttle valve 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.

11. An opening degree determining device, characterized in that, Comprising: A processor; A memory for storing executable instructions of the processor; Wherein, the processor is configured to execute the instructions to implement the opening degree determination method according to any one of claims 1 to 9.

12. A vehicle, characterized in that, The vehicle includes the opening degree determination device according to claim 11.

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