Method and device for controlling exhaust valve of fuel cell system and electronic equipment

Abstract

The invention provides a control method and device for an exhaust valve of a fuel cell system and electronic equipment, and relates to the technical field of fuel cell systems, and the control method comprises the following steps: according to the current of a hydrogen circulating pump and the high-frequency impedance of a galvanic pile in the fuel cell system, judging whether the current of the hydrogen circulating pump and the high-frequency impedance of the galvanic pile are abnormal or not in real time; if the current of the hydrogen circulating pump is abnormal or the high-frequency impedance of the galvanic pile is abnormal, the exhaust valve is controlled through the duration of the quick exhaust switch; and if the current of the hydrogen circulating pump and the high-frequency impedance of the galvanic pile are normal, correcting the preset switching duration according to the galvanic pile operation parameters in the fuel cell system, and controlling the exhaust valve according to the corrected preset switching duration. The technical problem that the application reliability of a fuel cell system is low due to exhaust valve control is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell systems, and in particular to a control method, device and electronic equipment for an exhaust valve of a fuel cell system. Background Art

[0002] After the hydrogen reacts with the air, a certain amount of nitrogen, water vapor and unconsumed hydrogen may accumulate at the hydrogen outlet of the fuel cell system, and a flow proportioning valve (FPV) is usually provided to discharge the accumulated nitrogen, water vapor, etc.

[0003] When the fuel cell system is running, its controller will turn on / off FPV at a pre-calibrated time. However, due to the rapid changes in the temperature and load current of the fuel cell stack in the actual operation of the fuel cell system, the preset FPV on / off time may not be suitable for the current working conditions, resulting in low application reliability of the fuel cell system. Summary of the invention

[0004] The object of the present invention is to provide a method, device and electronic device for controlling an exhaust valve of a fuel cell system, so as to alleviate the technical problem of low application reliability of the fuel cell system caused by exhaust valve control.

[0005] In a first aspect, an embodiment of the present invention provides a method for controlling an exhaust valve of a fuel cell system, comprising:

[0006] According to the current of the hydrogen circulation pump in the fuel cell system and the high-frequency impedance of the fuel cell stack, it is judged in real time whether the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are abnormal;

[0007] If the current of the hydrogen circulation pump is abnormal or the high-frequency impedance of the fuel cell stack is abnormal, the exhaust valve is controlled by the quick exhaust switch duration;

[0008] If the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are normal, the preset switching time is corrected according to the fuel cell stack operating parameters in the fuel cell system, and the exhaust valve is controlled according to the corrected preset switching time.

[0009] In combination with the first aspect, an embodiment of the present invention provides a first possible implementation of the first aspect, wherein the step of determining in real time whether the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are abnormal comprises:

[0010] Determine whether the current of the hydrogen circulation pump exceeds a preset current threshold; if so, the current of the hydrogen circulation pump is abnormal; if not, the current of the hydrogen circulation pump is normal;

[0011] Determine whether the high-frequency impedance of the battery stack is lower than a preset impedance threshold; if so, the high-frequency impedance of the battery stack is abnormal; if not, the high-frequency impedance of the battery stack is normal.

[0012] In combination with the first aspect, an embodiment of the present invention provides a second possible implementation of the first aspect, wherein if the current of the hydrogen circulation pump is abnormal or the high-frequency impedance of the fuel cell stack is abnormal, the step of controlling the exhaust valve by the quick exhaust switch duration includes:

[0013] If there is an abnormality in the current of the hydrogen circulation pump or in the high-frequency impedance of the fuel cell stack, the exhaust valve is controlled for a preset number of times according to the quick-release switch time; wherein the quick-release switch time is a first preset time for opening the exhaust valve and a second preset time for closing the exhaust valve.

[0014] In combination with the first aspect, an embodiment of the present invention provides a third possible implementation of the first aspect, wherein the step of correcting the preset switch duration according to the stack operating parameters in the fuel cell system includes:

[0015] According to the minimum cell voltage change before the exhaust valve is opened and after it is closed, the preset switching time corresponding to the current stack operating current is corrected.

[0016] In combination with the first aspect, an embodiment of the present invention provides a fourth possible implementation of the first aspect, wherein the step of correcting the preset switching time corresponding to the current stack operating current according to the minimum cell voltage change before and after the exhaust valve is opened and closed includes:

[0017] Recording a first current value and a first minimum cell voltage signal before the exhaust valve is opened, and recording a second current value and a second minimum cell voltage signal after the exhaust valve is closed;

[0018] If the difference between the second current value and the first current value does not exceed the preset current value, and the difference between the second minimum cell voltage signal and the first minimum cell voltage signal is greater than the first voltage threshold and less than the second voltage threshold, the preset opening time of the exhaust valve under the current stack operating current is increased by the first preset time, and the preset closing time of the exhaust valve under the current stack operating current remains unchanged;

[0019] If the difference between the second current value and the first current value does not exceed the preset current value, and the difference between the second minimum cell voltage signal and the first minimum cell voltage signal exceeds the second voltage threshold, the preset opening time of the exhaust valve under the current fuel cell stack operating current is increased by the second preset time, and the preset closing time of the exhaust valve under the current fuel cell stack operating current is reduced by the third preset time.

[0020] In combination with the first aspect, the embodiment of the present invention provides a fifth possible implementation of the first aspect, wherein the step of controlling the exhaust valve according to the corrected preset switch duration includes:

[0021] Determine whether the power of the fuel cell stack in the fuel cell system has accumulated to a preset power value, or whether the accumulated operation time of the fuel cell stack has reached a threshold;

[0022] If yes, the exhaust valve is controlled according to the revised preset switch duration;

[0023] If not, close the exhaust valve.

[0024] In combination with the first aspect, the embodiment of the present invention provides a sixth possible implementation of the first aspect, wherein the method further includes:

[0025] When the current of the hydrogen circulation pump is abnormal or the high-frequency impedance of the fuel cell stack is abnormal, the exhaust valve is controlled by the quick-release switch time. Until the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are normal, the quick-release switch time is switched to the preset switch time to control the exhaust valve.

[0026] In a second aspect, an embodiment of the present invention further provides a control device for an exhaust valve of a fuel cell system, comprising:

[0027] A judgment module, which judges in real time whether the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are abnormal according to the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack in the fuel cell system;

[0028] A first control module controls the exhaust valve by the quick exhaust switch duration if the current of the hydrogen circulation pump is abnormal or the high-frequency impedance of the fuel cell stack is abnormal;

[0029] The second control module corrects the preset switching time according to the stack operating parameters in the fuel cell system if the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are normal, and controls the exhaust valve according to the corrected preset switching time.

[0030] In a third aspect, an embodiment provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the steps of the method described in any of the aforementioned implementation methods are implemented.

[0031] In a fourth aspect, an embodiment provides a machine-readable storage medium, wherein the machine-readable storage medium stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to implement the steps of the method described in any one of the aforementioned implementations.

[0032] The embodiments of the present invention provide a control method, device and electronic device for the exhaust valve of a fuel cell system. By judging whether there is water accumulation on the anode side of the system through the current of the hydrogen circulation pump in the fuel cell system and the high-frequency impedance of the fuel cell stack, if there is water accumulation, the exhaust valve is adjusted by adjusting the quick-drain switch time to quickly drain the water. If there is no water accumulation, the preset switch time control strategy is corrected according to the current fuel cell stack operating parameters of the fuel cell system, and the exhaust valve is adjusted according to the corrected control strategy to make the exhaust valve control more consistent with the current operating state of the system to ensure application reliability.

[0033] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A flow chart of a method for controlling an exhaust valve of a fuel cell system provided by an embodiment of the present invention;

[0037] Figure 2 A flow chart of another method for controlling an exhaust valve of a fuel cell system provided by an embodiment of the present invention;

[0038] Figure 3 A schematic diagram of functional modules of a control device for an exhaust valve of a fuel cell system provided by an embodiment of the present invention;

[0039] Figure 4 A schematic diagram of the hardware architecture of an electronic device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] At present, the staff responsible for calibration generally control the fuel cell stack to operate at different current densities on the fuel cell system test bench. According to the changes in the minimum cell voltage of the fuel cell stack or other indicators, they calibrate the FPV opening time / closing time, or integrate the electric energy running at this current. When the system accumulates this electric energy in the later stage, the FPV will be turned on for a certain time.

[0042] If the FPV on / off calibration time is unreasonable, or as the fuel cell system runs, the initial calibration parameters are no longer applicable to the current system operation, then the opening of the FPV may not achieve the purpose of discharging the exhaust gas accumulated on the anode side, but instead discharge a certain amount of hydrogen, resulting in increased hydrogen consumption. In addition, in actual application, it is also possible that the FPV is not turned on when it should be turned on, resulting in unstable system operation and even anode flooding.

[0043] Based on this, an embodiment of the present invention provides a control method, device and electronic device for the exhaust valve of a fuel cell system, which intervenes in the switch of FPV according to the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack, and judges and continuously corrects the FPV switch parameters based on the change in the minimum single cell voltage before and after the FPV is turned on under steady-state conditions, thereby avoiding increased system hydrogen consumption or poor operating conditions due to unreasonable preset calibration data, thereby ensuring application reliability.

[0044] To facilitate understanding of this embodiment, a control method for a fuel cell system exhaust valve disclosed in an embodiment of the present invention is first introduced in detail. This method can be applied to intelligent control devices such as controllers, vehicle computers, and battery management systems.

[0045] Figure 1 A flow chart of a method for controlling an exhaust valve of a fuel cell system provided in an embodiment of the present invention.

[0046] Reference Figure 1 , the method may include the following steps:

[0047] Step S102, judging in real time whether the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are abnormal based on the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack in the fuel cell system.

[0048] Before step S102 , the fuel cell system is powered on and is in operation.

[0049] The inventors have discovered that during the operation of the fuel cell system, when water accumulates on the anode side, the current of the hydrogen circulation pump will increase and the high-frequency impedance of the fuel cell stack will decrease; therefore, it is possible to determine whether water accumulates on the anode side of the system by determining whether the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are abnormal.

[0050] Step S104: If the current of the hydrogen circulation pump is abnormal or the high-frequency impedance of the fuel cell stack is abnormal, the exhaust valve is controlled by the quick exhaust switch duration.

[0051] At this time, if there is water accumulation on the anode side of the system, the quick discharge switch duration is selected to control the exhaust valve. Among them, quick discharge is a fast discharge mode, and the quick discharge switch duration is to control the duration of opening and closing the fast discharge mode, thereby controlling the exhaust valve through the quick discharge switch duration.

[0052] Step S106, if the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are normal, the preset switching time is corrected according to the fuel cell stack operating parameters in the fuel cell system, and the exhaust valve is controlled according to the corrected preset switching time.

[0053] Here, if there is no water accumulation on the anode side of the system, the exhaust valve control parameter is corrected by the current stack operating parameters, and the corrected control parameter is selected to control the exhaust valve, so that the control of the exhaust valve is more in line with the current operating conditions and the application reliability is higher. It can be understood that the opening and closing state or the opening and closing angle of the exhaust valve is achieved by adjusting some control parameters of the exhaust valve itself through the corresponding control device, and each exhaust valve will correspond to the corresponding control parameter in advance. In order to ensure reliability during operation, the control parameter is corrected, and the exhaust valve is adjusted according to the corrected control parameter, which can ensure that the opening and closing of the exhaust valve is more in line with the preset switch duration; the preset switch duration can be understood as the preset duration of controlling the exhaust valve to be in the open state and the preset duration of the exhaust valve to be in the closed state. The preset switch duration here can be set in advance according to the model and parameters of the exhaust valve to set the preset opening duration and preset closing duration corresponding to the exhaust valve.

[0054] In a preferred embodiment of actual application, whether there is water accumulation on the anode side of the system is determined by the current of the hydrogen circulation pump in the fuel cell system and the high-frequency impedance of the fuel cell stack. If there is water accumulation, the exhaust valve is adjusted by the quick drain switch time to quickly drain the water. If there is no water accumulation, the preset switch time control strategy is corrected according to the current fuel cell stack operating parameters of the fuel cell system, and the exhaust valve is adjusted according to the corrected control strategy to make the exhaust valve control more consistent with the current operating state of the system to ensure application reliability.

[0055] In some embodiments, the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack can be compared with corresponding preset thresholds respectively. If either of the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack does not meet the requirements, it can be determined that there is an abnormality. Exemplarily, the step of determining in real time whether the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are abnormal in step S102 includes:

[0056] Step 1.1), determining whether the current of the hydrogen circulation pump exceeds a preset current threshold; if so, the current of the hydrogen circulation pump is abnormal; if not, the current of the hydrogen circulation pump is normal;

[0057] Step 1.2), determine whether the high-frequency impedance of the fuel cell stack is lower than a preset impedance threshold; if so, the high-frequency impedance of the fuel cell stack is abnormal; if not, the high-frequency impedance of the fuel cell stack is normal.

[0058] It should be noted that if either the current of the hydrogen circulation pump or the high-frequency impedance of the fuel cell stack is abnormal, it can be determined that water is accumulated on the anode side of the fuel cell system.

[0059] On the basis of the abnormality judgment provided in the above-mentioned embodiment, the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are detected in real time, and the switch time corresponding to the exhaust valve is switched in real time to control the switch time. The method also includes:

[0060] Step 1.3), when the current of the hydrogen circulation pump is abnormal or the high-frequency impedance of the fuel cell stack is abnormal, the exhaust valve is controlled by the quick-discharge switch time, until the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are normal, the quick-discharge switch time is switched to the preset switch time to control the exhaust valve.

[0061] If an abnormality is detected in the current of the hydrogen circulation pump or the high-frequency impedance (High Frequency Resistor, HFR) of the fuel cell stack, the FPV switch will not be controlled according to the preset switch time control map; wherein, when the current of the hydrogen circulation pump and the high-frequency impedance HFR of the fuel cell stack are in normal conditions, the preset switch time control strategy is to turn off the FPV based on the corresponding accumulated power value at a certain current, and turn on the FPV based on the preset time.

[0062] In actual applications, if it is detected that the current of the hydrogen circulation pump is large, the FPV fast exhaust mode is turned on until the current of the hydrogen circulation pump drops to the preset current threshold, and then the FPV switch is controlled by the preset switch time. Or if the high-frequency impedance is detected to be lower than the preset impedance threshold (such as 90mΩ), the FPV fast exhaust mode is turned on until the high-frequency impedance recovers to above 105mΩ, and then the FPV switch is controlled by the preset switch time.

[0063] In some embodiments, the exhaust valve is opened and closed by setting the exhaust mode in a quick exhaust mode so that the fuel cell system with water accumulation on the anode side can achieve a quick exhaust effect, specifically including:

[0064] Step 2.1), if there is an abnormality in the current of the hydrogen circulation pump or in the high-frequency impedance of the fuel cell stack, the exhaust valve is controlled for a preset number of times according to the quick exhaust switch duration.

[0065] Among them, the quick exhaust switch duration is the first preset duration for controlling the exhaust valve to be in an open state, and the duration for controlling the exhaust valve to be in a closed state is the second preset duration.

[0066] The first preset duration, the second preset duration and the preset number of times can be set according to actual conditions; as an optional embodiment, the FPV fast discharge mode is to control the FPV to open for the first preset duration of 1s and close for the second preset duration of 0.5s. If this switch cycle continues for the preset number of times 10 times, at this time, the hydrogen pump current and the high-frequency impedance of the fuel cell stack have not returned to normal, in order to protect the fuel cell system and prevent its anode inlet pressure from being too low, the FPV will no longer be turned on until it is restored to control the FPV according to the preset switch duration.

[0067] In some embodiments, if the system is in a normal state and there is no water accumulation on the anode side, the preset switch duration can be corrected according to the stack operation parameters in the fuel cell system. Exemplarily, this step mainly includes:

[0068] Step 3.1), according to the minimum cell voltage change before and after the exhaust valve is opened and closed, correct the preset switching time corresponding to the current stack operating current.

[0069] Exemplarily, the first current value I_before and the first minimum cell voltage signal V_before before the exhaust valve opens are recorded, and the second current value I_after and the second minimum cell voltage signal V_after after the exhaust valve is closed are recorded; if the difference between the second current value and the first current value exceeds the preset current value, the preset closing / opening time of the FPV under the stack operating current is controlled to remain unchanged, that is, the preset switching duration is controlled to remain unchanged; if the difference between the second current value and the first current value does not exceed the preset current value, and the difference between the second minimum cell voltage signal and the first minimum cell voltage signal is less than the first voltage threshold, the preset closing / opening time of the FPV under the stack operating current is controlled to remain unchanged; if If the difference between the second current value and the first current value does not exceed the preset current value, and the difference between the second minimum cell voltage signal and the first minimum cell voltage signal is greater than or equal to the first voltage threshold and less than the second voltage threshold, the preset opening time of the exhaust valve under the current battery stack operating current is increased by the first preset time, and the preset closing time of the exhaust valve under the current battery stack operating current remains unchanged; if the difference between the second current value and the first current value does not exceed the preset current value, and the difference between the second minimum cell voltage signal and the first minimum cell voltage signal is equal to or exceeds the second voltage threshold, the preset opening time of the exhaust valve under the current battery stack operating current is increased by the second preset time, and the preset closing time of the exhaust valve under the current battery stack operating current is reduced by the third preset time. The preset switch time control strategy modified by the above method can make the control of the switch exhaust valve more suitable for the current operation and ensure the reliability of system application.

[0070] Among them, the minimum cell voltage change threshold is set, such as the first voltage threshold V1 can be selected as 10mv, and the second voltage threshold V2 can be selected as 20mv; the minimum cell voltage change before and after FPV is turned on, that is, the difference between the second minimum cell voltage signal and the first minimum cell voltage signal is Vdiff.

[0071] Similarly, the high-frequency impedance change HFRdiff before and after FPV is turned on can also be recorded, and the difference between the first high-frequency impedance before FPV is turned on and the second high-frequency impedance after it is turned off can be compared with the high-frequency impedance change threshold, and the opening and closing of FPV can be controlled according to the comparison result; the high-frequency impedance change threshold HFR can be set to 20mΩ.

[0072] As an optional embodiment, the heat generation efficiency of the stack can be determined according to the obtained coolant temperature, stack output power, hydrogen path temperature, and air path temperature of the stack in the proton exchange membrane fuel cell; the impurity content of the hydrogen path in the proton exchange membrane fuel cell can be determined according to the heat generation efficiency of the stack; the opening and closing timing of the exhaust valve can be controlled based on the impurity content to discharge the impurities in the hydrogen path. Alternatively, the opening and closing time of the exhaust valve can be calculated according to the estimated hydrogen concentration.

[0073] On the basis of the above-mentioned embodiment, the exhaust valve may be operated as follows based on the corrected preset switch duration, specifically including:

[0074] Step 4.1), determining whether the power of the fuel cell stack in the fuel cell system has accumulated to a preset power value, or whether the accumulated operation time of the fuel cell stack has reached a threshold;

[0075] Among them, the current operating current of the battery stack is obtained, and when the power is accumulated to a preset value (such as 0.5Ah), the FPV is turned on at the preset opening time of the current operating current.

[0076] Step 4.2), if yes, then control the exhaust valve according to the revised preset switch duration;

[0077] Step 4.3), if not, close the exhaust valve.

[0078] If the stack operating current remains unchanged before and after FPV is turned on, the change in the minimum cell voltage can be used to characterize whether the preset switch time period setting of the current FPV is reasonable. If it is reasonable, the accumulated nitrogen or water vapor can be discharged by turning FPV on / off, so that the performance of the system can be restored to a certain extent. If the minimum cell voltage has not changed significantly, the current FPV switch does not need to be adjusted; if the minimum cell voltage changes significantly, a large amount of nitrogen and water vapor have accumulated at the hydrogen side outlet, and the FPV switch time needs to be adjusted appropriately. If the minimum cell voltage change Vdiff is less than V1, the preset closing / opening time of the exhaust valve under this current density remains unchanged; if the minimum cell voltage change Vdiff is greater than V1 and less than V2, the preset opening time of the exhaust valve under this current density increases by a certain value, and the preset closing time (accumulated power value threshold) remains unchanged; if the minimum cell voltage change Vdiff is greater than V2, the preset opening time of the exhaust valve increases by a certain value, and the preset closing time (accumulated power value threshold) decreases by a certain value. The FPV on / off time corrected at different current densities during operation is stored in the fuel cell system controller so that the next time the system operates, it will be controlled with the corrected value.

[0079] Figure 2 A flow chart of another method for controlling an exhaust valve of a fuel cell system provided by an embodiment of the present invention.

[0080] like Figure 2 As shown, the system is powered on at low voltage and is in operation; determine whether the hydrogen circulation pump current is > 0.6A or the high-frequency impedance is < 90mΩ; if so, enter the fast discharge mode;

[0081] Control the FPV quick exhaust, turn it on for 1 s and off for 0.5 s; judge whether there is a hydrogen circulation pump current < 0.5 A or a high-frequency impedance > 105 mΩ at this time. If so, the FPV exits the quick exhaust mode; if not, judge whether the FPV quick exhaust > 15 s. If so, the FPV exits the quick exhaust mode; if not, control the FPV quick exhaust again, turn it on for 1 s and off for 0.5 s;

[0082] If it exists, judge whether the stack power has accumulated to a preset value, or whether it has accumulated and run for 5 min; where the preset value can be 100 A; if it exists, record the current I_before and the minimum single-cell voltage signal V_before, and the FPV is turned on according to the preset controlmap, and the FPV is turned on according to the preset controlmap, and then judge whether there is a situation where the FPV turn-on time > the preset time, and the preset time can be selected as 2 s; if it exists, control the FPV to turn off; if not, execute the step of turning on the FPV according to the preset controlmap again; when the FPV is turned off, record the current I_after and the minimum single-cell voltage signal V_after, and judge whether there is an absolute value of the difference between I_after and I_before > 20 A; if so, keep the preset turn-off / turn-on time of the FPV under the stack operating current unchanged; if not, according to Vdiff = V_after - V_before, judge whether there is a situation where Vdiff < V1 (10 mv). If so, keep the preset turn-off / turn-on time of the FPV under the stack operating current unchanged; if not, judge whether there is a situation where Vdiff < V2 (20 mv); if so, increase the preset turn-on time of the FPV under the stack operating current by a certain value and keep the preset turn-off time unchanged; if not, increase the preset turn-on time of the FPV under the stack operating current by a certain value and decrease the preset turn-off time by a certain value; the system shuts down and stores the FPV switch time at the current current density.

[0083] The embodiment of the present invention not only controls the switch of the FPV based on the data during the steady-state operation calibration test of the system bench, that is, based on the FPV turn-on / turn-off time calibrated by the system bench experiment (the turn-off time is based on the accumulated power value), but also intervenes in the switch of the FPV according to the magnitude of the hydrogen circulation pump current and the high-frequency impedance. In view of the change in the minimum single-cell voltage of the stack before and after the FPV is turned on under steady-state conditions, the FPV switch parameters are judged and continuously corrected in real time, avoiding the increase in system hydrogen consumption or poor operating conditions caused by unreasonable preset calibration data.

[0084] The advantage of the embodiment of the invention is that the calculation method for the on / off control of the exhaust valve is simple and does not require complex calculation formulas. The reliability is higher according to the different judgment bases when the system is in a steady state or dynamically changing conditions, and the parameters are constantly self-corrected, and the critical value of the exhaust valve opening time and closing time is constantly explored, that is, the system is constantly optimized.

[0085] like Figure 3 As shown, an embodiment of the present invention further provides a control device for an exhaust valve of a fuel cell system, comprising:

[0086] A judgment module, which judges in real time whether the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are abnormal according to the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack in the fuel cell system;

[0087] A first control module controls the exhaust valve by the quick exhaust switch duration if the current of the hydrogen circulation pump is abnormal or the high-frequency impedance of the fuel cell stack is abnormal;

[0088] The second control module corrects the preset switching time according to the stack operating parameters in the fuel cell system if the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are normal, and controls the exhaust valve according to the corrected preset switching time.

[0089] In some embodiments, the judgment module is also specifically used to judge whether the current of the hydrogen circulation pump exceeds a preset current threshold; if it exceeds, the current of the hydrogen circulation pump is abnormal; if it does not exceed, the current of the hydrogen circulation pump is normal; judge whether the high-frequency impedance of the fuel cell stack is lower than a preset impedance threshold; if it is lower, the high-frequency impedance of the fuel cell stack is abnormal; if it is not lower, the high-frequency impedance of the fuel cell stack is normal.

[0090] In some embodiments, the first control module is further specifically used to control the exhaust valve according to the quick-release switch time for a preset number of times if there is an abnormality in the current of the hydrogen circulation pump or the high-frequency impedance of the fuel cell stack; wherein the quick-release switch time is a first preset time for opening the exhaust valve and a second preset time for closing the exhaust valve.

[0091] In some embodiments, the second control module is further specifically used to correct the preset switching time corresponding to the current stack operating current according to the minimum cell voltage change before the exhaust valve is opened and after it is closed.

[0092] In some embodiments, the second control module is also specifically used to record the first current value and the first minimum cell voltage signal before the exhaust valve is opened, and record the second current value and the second minimum cell voltage signal after the exhaust valve is closed; if the difference between the second current value and the first current value does not exceed the preset current value, and the difference between the second minimum cell voltage signal and the first minimum cell voltage signal is greater than the first voltage threshold and less than the second voltage threshold, then the preset opening time of the exhaust valve under the current battery stack operating current is increased by the first preset time, and the preset closing time of the exhaust valve under the current battery stack operating current remains unchanged; if the difference between the second current value and the first current value does not exceed the preset current value, and the difference between the second minimum cell voltage signal and the first minimum cell voltage signal exceeds the second voltage threshold, then the preset opening time of the exhaust valve under the current battery stack operating current is increased by the second preset time, and the preset closing time of the exhaust valve under the current battery stack operating current is reduced by the third preset time.

[0093] In some embodiments, the second control module is further specifically used to determine whether the power of the fuel cell stack in the fuel cell system has accumulated to a preset power value, or whether the accumulated operating time of the fuel cell stack has reached a threshold value; if so, the exhaust valve is controlled according to the corrected preset switching time; if not, the exhaust valve is closed.

[0094] In some embodiments, the first control module is further specifically used to control the exhaust valve by the quick-release switch time when the current of the hydrogen circulation pump is abnormal or the high-frequency impedance of the fuel cell stack is abnormal, until the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are normal, and then the quick-release switch time is switched to a preset switch time to control the exhaust valve.

[0095] An embodiment of the present invention provides an electronic device for implementing an electronic device. In this embodiment, the electronic device may be, but is not limited to, a personal computer (PC), a laptop computer, a monitoring device, a server, or other computer device with analysis and processing capabilities.

[0096] As an exemplary embodiment, see Figure 4 The electronic device 110 includes a communication interface 111, a processor 112, a memory 113 and a bus 114. The processor 112, the communication interface 111 and the memory 113 are connected via the bus 114. The memory 113 is used to store a computer program that supports the processor 112 to execute the method. The processor 112 is configured to execute the program stored in the memory 113.

[0097] The machine-readable storage medium mentioned in this article can be any electronic, magnetic, optical or other physical storage device that can contain or store information, such as executable instructions, data, etc. For example, the machine-readable storage medium can be: RAM (Radom Access Memory), volatile memory, non-volatile memory, flash memory, storage drive (such as hard disk drive), any type of storage disk (such as CD, DVD, etc.), or similar storage medium, or a combination thereof.

[0098] The non-volatile medium may be a non-volatile memory, a flash memory, a storage drive (such as a hard drive), any type of storage disk (such as a CD, DVD, etc.), or a similar non-volatile storage medium, or a combination thereof.

[0099] It can be understood that the specific operation methods of each functional module in this embodiment can refer to the detailed description of the corresponding steps in the above method embodiment, and will not be repeated here.

[0100] The computer-readable storage medium provided in the embodiment of the present invention stores a computer program. When the computer program code is executed, the method described in any of the above embodiments can be implemented. For specific implementation, please refer to the method embodiment, which will not be described in detail here.

[0101] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0102] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0103] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0104] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or can easily conceive of changes, or make equivalent replacements for some of the technical features therein. Such modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A method for controlling an exhaust valve of a fuel cell system, characterized in that: include: According to the current of the hydrogen circulation pump in the fuel cell system and the high-frequency impedance of the fuel cell stack, it is judged in real time whether the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are abnormal; If the current of the hydrogen circulation pump is abnormal or the high-frequency impedance of the fuel cell stack is abnormal, the exhaust valve is controlled by the quick exhaust switch duration; If the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are normal, the preset switching time is corrected according to the fuel cell stack operating parameters in the fuel cell system, and the exhaust valve is controlled according to the corrected preset switching time.

2. The method according to claim 1, characterized in that The step of determining in real time whether the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are abnormal comprises: Determine whether the current of the hydrogen circulation pump exceeds a preset current threshold; if so, the current of the hydrogen circulation pump is abnormal; if not, the current of the hydrogen circulation pump is normal; Determine whether the high-frequency impedance of the battery stack is lower than a preset impedance threshold; if so, the high-frequency impedance of the battery stack is abnormal; if not, the high-frequency impedance of the battery stack is normal.

3. The method according to claim 1, characterized in that If the current of the hydrogen circulation pump is abnormal or the high-frequency impedance of the fuel cell stack is abnormal, the step of controlling the exhaust valve by the quick exhaust switch duration includes: If there is an abnormality in the current of the hydrogen circulation pump or in the high-frequency impedance of the fuel cell stack, the exhaust valve is controlled for a preset number of times according to the quick-release switch time; wherein the quick-release switch time is a first preset time for opening the exhaust valve and a second preset time for closing the exhaust valve.

4. The method according to claim 1, characterized in that The step of correcting the preset switch duration according to the stack operation parameters in the fuel cell system includes: According to the minimum cell voltage change before the exhaust valve is opened and after it is closed, the preset switching time corresponding to the current stack operating current is corrected.

5. The method according to claim 4, characterized in that The step of correcting the preset switching time corresponding to the current stack operating current according to the minimum cell voltage change before and after the exhaust valve is opened and closed includes: Recording a first current value and a first minimum cell voltage signal before the exhaust valve is opened, and recording a second current value and a second minimum cell voltage signal after the exhaust valve is closed; If the difference between the second current value and the first current value does not exceed the preset current value, and the difference between the second minimum cell voltage signal and the first minimum cell voltage signal is greater than or equal to the first voltage threshold and less than the second voltage threshold, the preset opening time of the exhaust valve under the current stack operating current is increased by the first preset time, and the preset closing time of the exhaust valve under the current stack operating current remains unchanged; If the difference between the second current value and the first current value does not exceed the preset current value, and the difference between the second minimum cell voltage signal and the first minimum cell voltage signal is equal to or exceeds the second voltage threshold, the preset opening time of the exhaust valve under the current fuel cell stack operating current is increased by the second preset time, and the preset closing time of the exhaust valve under the current fuel cell stack operating current is reduced by the third preset time.

6. The method according to claim 1, characterized in that The steps of controlling the exhaust valve according to the revised preset switch time include: Determine whether the power of the fuel cell stack in the fuel cell system has accumulated to a preset power value, or whether the accumulated operation time of the fuel cell stack has reached a threshold; If yes, the exhaust valve is controlled according to the revised preset switch duration; If not, close the exhaust valve.

7. The method according to claim 1, characterized in that The method further comprises: When the current of the hydrogen circulation pump is abnormal or the high-frequency impedance of the fuel cell stack is abnormal, the exhaust valve is controlled by the quick-release switch time. Until the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are normal, the quick-release switch time is switched to the preset switch time to control the exhaust valve.

8. A control device for an exhaust valve of a fuel cell system, characterized in that: include: A judgment module, which judges in real time whether the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are abnormal according to the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack in the fuel cell system; A first control module controls the exhaust valve by the quick exhaust switch duration if the current of the hydrogen circulation pump is abnormal or the high-frequency impedance of the fuel cell stack is abnormal; The second control module corrects the preset switching time according to the stack operating parameters in the fuel cell system if the current of the hydrogen circulation pump and the high-frequency impedance of the fuel cell stack are normal, and controls the exhaust valve according to the corrected preset switching time.

9. An electronic device, characterized in that: The method comprises a memory, a processor, and a program stored in the memory and capable of being run on the processor, wherein the processor implements the method according to any one of claims 1 to 7 when executing the program.

10. A computer-readable storage medium, characterized in that: The readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 7 is implemented.

Images