Hydrogen leakage detection method, device and equipment, vehicle and medium

Abstract

The invention discloses a hydrogen leakage detection method, device and equipment, a vehicle and a medium, and is applied to the technical field of fuel cells. The method specifically comprises the following steps: acquiring the current rotating speed of a hydrogen circulating pump, the current pile inlet hydrogen pressure and the current pile outlet hydrogen pressure; determining a current stack inlet and outlet hydrogen pressure difference based on the current stack inlet hydrogen pressure and the current stack outlet hydrogen pressure; based on a first mapping relation between the measured value of the current pile inlet hydrogen flow and the rotating speed of the hydrogen circulating pump, the pile inlet hydrogen pressure and the difference between the pile inlet hydrogen pressure and the pile outlet hydrogen pressure, determining the measured value of the current pile inlet hydrogen flow; determining a current stack inlet hydrogen flow theoretical value based on a second mapping relation between the stack inlet hydrogen flow theoretical value and the current density value; and the current hydrogen leakage detection result is determined based on the current electric pile inlet hydrogen flow measured value and the current electric pile inlet hydrogen flow theoretical value, and therefore real-time detection of the hydrogen leakage amount in the whole life cycle of vehicle operation can be achieved.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a hydrogen leakage detection method, device, equipment, vehicle and medium. Background Art

[0002] A fuel cell system is a system that uses a fuel cell stack to generate electricity and controls the power generation of the fuel cell stack. In a fuel cell system, the anode system is a system that supplies hydrogen as fuel to the fuel cell stack. In order to ensure the service life and safety of the fuel cell system, it is necessary to ensure the strong sealing and low leakage of the hydrogen circuit of the anode system. How to detect the hydrogen leakage of the anode system in real time during the operation of new energy vehicles is a technical problem that currently needs to be solved in the field of fuel cell technology. Summary of the invention

[0003] The present application provides a hydrogen leakage detection method, device, equipment, vehicle and medium to solve the problem that it is difficult to detect hydrogen leakage during the operation of new energy vehicles in the prior art. Specifically, the technical solution provided by the present application is as follows:

[0004] On the one hand, the present application provides a hydrogen leakage detection method, comprising:

[0005] Obtain the current hydrogen circulation pump speed, the current fuel cell stack inlet hydrogen pressure and the current fuel cell stack outlet hydrogen pressure corresponding to the current power density value during the operation of the fuel cell system on the new energy vehicle, and determine the current fuel cell stack inlet and outlet hydrogen pressure difference based on the current fuel cell stack inlet hydrogen pressure and the current fuel cell stack outlet hydrogen pressure;

[0006] Based on a first mapping relationship between an actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current electric density value and a hydrogen circulation pump speed, a hydrogen pressure at the stack inlet, and a hydrogen pressure difference at the stack inlet and outlet, an actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current hydrogen circulation pump speed, the current hydrogen pressure at the stack inlet, and the current hydrogen pressure difference at the stack inlet and outlet is determined as the actual measured value of the hydrogen flow rate at the stack inlet; wherein the first mapping relationship is measured and calibrated when there is no hydrogen leakage in the anode system of the fuel cell system;

[0007] Based on a second mapping relationship between a theoretical value of hydrogen flow at the inlet of the fuel cell stack corresponding to the fuel cell system and the electric density value, the theoretical value of hydrogen flow at the inlet of the fuel cell stack corresponding to the current electric density value is determined as the current theoretical value of hydrogen flow at the inlet of the fuel cell stack;

[0008] Based on the actual measured value of the hydrogen flow rate at the current fuel cell stack inlet and the theoretical value of the hydrogen flow rate at the current fuel cell stack inlet, the current hydrogen leakage detection result of the anode system in the fuel cell system is determined.

[0009] On the other hand, the present application also provides a hydrogen leakage detection device, comprising:

[0010] A data acquisition unit is used to obtain the current hydrogen circulation pump speed, the current fuel cell stack inlet hydrogen pressure and the current fuel cell stack outlet hydrogen pressure corresponding to the current power density value during the operation of the fuel cell system on the new energy vehicle, and determine the current fuel cell stack inlet and outlet hydrogen pressure difference based on the current fuel cell stack inlet hydrogen pressure and the current fuel cell stack outlet hydrogen pressure;

[0011] A first determination unit is used to determine the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current hydrogen circulation pump speed, the current hydrogen pressure at the stack inlet and the current hydrogen pressure difference at the stack inlet and outlet as the actual measured value of the hydrogen flow rate at the stack inlet based on a first mapping relationship between the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current electric density value and the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet; wherein the first mapping relationship is measured and calibrated when there is no hydrogen leakage in the anode system of the fuel cell system;

[0012] A second determining unit is used to determine the theoretical value of the hydrogen flow rate at the inlet of the stack corresponding to the current power density value as the current theoretical value of the hydrogen flow rate at the inlet of the stack based on a second mapping relationship between the theoretical value of the hydrogen flow rate at the inlet of the stack corresponding to the fuel cell system and the power density value;

[0013] The leakage detection unit is used to determine the current hydrogen leakage detection result of the anode system in the fuel cell system based on the current measured value of the hydrogen flow at the inlet of the fuel cell stack and the current theoretical value of the hydrogen flow at the inlet of the fuel cell stack.

[0014] On the other hand, the present application also provides a fuel cell control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the above-mentioned hydrogen leakage detection method is implemented when the processor executes the computer program.

[0015] On the other hand, the present application also provides a fuel cell system, including a fuel cell stack, an anode system for supplying hydrogen to the fuel cell stack, a cathode system for supplying air to the fuel cell stack, a cooling system for cooling the fuel cell stack, and the above-mentioned fuel cell control device.

[0016] On the other hand, the present application also provides a new energy vehicle, including a body, a chassis frame, wheels, an electric motor, a vehicle control system, and the above-mentioned fuel cell system.

[0017] On the other hand, the present application also provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed by a processor, the above-mentioned hydrogen leakage detection method is implemented.

[0018] The beneficial effects of this application are as follows:

[0019] The present application measures and calibrates the first mapping relationship between the actual measured value of the hydrogen flow rate at the stack inlet corresponding to different electric density values ​​and the speed of the hydrogen circulation pump, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet when there is no hydrogen leakage in the anode system of the fuel cell system. In the process of the fuel cell system running on the new energy vehicle, the first mapping relationship can be used to determine the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current speed of the hydrogen circulation pump, the current hydrogen pressure at the stack inlet and the current hydrogen pressure difference at the stack inlet and outlet as the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current electric density value. Therefore, based on the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current electric density value and the theoretical value of the hydrogen flow rate at the stack inlet corresponding to the current electric density value, real-time detection of the hydrogen leakage of the anode system in the fuel cell system can be achieved during the full life cycle of the new energy vehicle. Further, when the hydrogen leakage is detected to exceed the limit, the new energy vehicle can be triggered to alarm in time, effectively ensuring the safety of the new energy vehicle and personnel, and there is no need to add additional components such as hydrogen concentration sensors, thereby providing an effective solution for hydrogen leakage detection during the operation of new energy vehicles without increasing the detection cost.

[0020] Other features and advantages of the present application will be described in the subsequent description, and in part, will become apparent from the description, or will be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the anode system of the fuel cell system in the embodiment of the present application;

[0023] Figure 2 This is a schematic diagram of the general process of the hydrogen leakage detection method in the embodiment of the present application;

[0024] Figure 3 This is a functional structure diagram of a hydrogen leakage detection device in an embodiment of the present application;

[0025] Figure 4 Schematic diagram of the hardware structure of the fuel cell control device in the embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and beneficial effects of this application clearer, the technical solution in the embodiment of this application will be clearly and completely described below in conjunction with the drawings in the embodiment of this application. Obviously, the described embodiment is only a part of the embodiment of this application, not all the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] In order to facilitate those skilled in the art to better understand the present application, the technical terms involved in the present application are briefly introduced below.

[0028] The first mapping relationship is a mapping relationship between an actual value of hydrogen flow at the inlet of the fuel cell stack measured and calibrated when there is no hydrogen leakage in the anode system of the fuel cell system and a hydrogen circulation pump speed, a hydrogen pressure at the inlet of the fuel cell stack, and a hydrogen pressure difference at the inlet and outlet of the fuel cell stack;

[0029] The second mapping relationship is the mapping relationship between the theoretical value of the hydrogen flow rate at the stack inlet and the power density value determined based on the power generation characteristics of the fuel cell system. It can be obtained from the instruction manual of the fuel cell system, or can be obtained by theoretical deduction based on various parameters of the fuel cell system.

[0030] The anode system is the system that supplies hydrogen to the fuel cell stack in the fuel cell system. Figure 1 As shown, the anode system at least includes a hydrogen injection valve IJV, a hydrogen circulation pump ARB, a speed sensor ( Figure 1 Not shown), water tank WT, drain valve ADV, nitrogen drain valve APV, first pressure sensor PT1 and second pressure sensor PT2, etc., wherein the hydrogen injection valve IJV is used to realize the hydrogen flow control into the stack, the hydrogen circulation pump ARB is used to realize the hydrogen circulation, the water tank WT is used to realize the gas-liquid separation, the drain valve ADV is used to realize the drainage, the nitrogen drain valve APV is used to realize the nitrogen and water drainage, the first pressure sensor PT1 is used to collect the hydrogen pressure at the inlet of the fuel cell, and the second pressure sensor PT2 is used to collect the hydrogen pressure at the outlet of the fuel cell. In this application, during the calibration process of the first mapping relationship, refer to Figure 1 As shown, the anode system may further include a flow sensor, which is removed after the first mapping relationship calibration is completed.

[0031] It should be noted that the terms "first", "second", etc. mentioned in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0032] After introducing the technical terms involved in this application, the application scenarios and design concepts of this application are briefly introduced.

[0033] In order to monitor whether there is hydrogen leakage in the anode system of the fuel cell system, the traditional solution is to install a hydrogen concentration sensor at the tail exhaust of the anode system, so as to determine whether there is hydrogen leakage in the anode system through the hydrogen concentration value collected by the hydrogen concentration sensor. This hydrogen leakage detection solution requires the installation of a hydrogen concentration sensor at the tail exhaust of the anode system, which has a high detection cost and cannot detect the amount of hydrogen leakage, making it difficult to achieve quantitative detection of hydrogen leakage. In addition, when the hydrogen concentration sensor is damaged, the hydrogen leakage detection fails, and there are still certain safety hazards.

[0034] To this end, the present application measures and calibrates a first mapping relationship between the actual measured value of the hydrogen flow rate at the stack inlet corresponding to different electric density values ​​and the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet, when there is no hydrogen leakage in the anode system of the fuel cell system. During the operation of the fuel cell system on a new energy vehicle, the first mapping relationship can be used to determine the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current hydrogen circulation pump speed, the current hydrogen pressure at the stack inlet and the current hydrogen pressure difference at the stack inlet and outlet as the current actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current electric density value, so that the current stack corresponding to the current electric density value can be determined by using the second mapping relationship between the theoretical value of the hydrogen flow rate at the stack inlet and the electric density value. After obtaining the theoretical value of the inlet hydrogen flow rate, based on the actual measured value of the current stack inlet hydrogen flow rate corresponding to the current electrical density value and the current stack inlet hydrogen flow rate theoretical value, real-time detection of the hydrogen leakage of the anode system in the fuel cell system during the full life cycle of the new energy vehicle can be achieved, and then the new energy vehicle can be triggered to alarm in time when the hydrogen leakage exceeds the limit, effectively ensuring the safety of new energy vehicles and personnel, and there is no need to add additional components such as hydrogen concentration sensors, thereby effectively avoiding the problem of hydrogen leakage detection failure due to damage to components such as hydrogen concentration sensors, and thus providing a lasting and effective solution for hydrogen leakage detection during the operation of new energy vehicles without increasing the detection cost.

[0035] After introducing the application scenarios and design ideas of the present application, the technical solutions provided by the present application are described in detail below.

[0036] The present application provides a hydrogen leakage detection method, which can be applied to a fuel cell control device in a fuel cell system, such as an FCU (Fuel cell Control Unit) in a fuel cell system, or an HCU (Hydrogen Control Unit) in an anode system of a fuel cell system. For details, see Figure 2 As shown, the general process of the hydrogen leakage detection method provided in the embodiment of the present application is as follows:

[0037] Step 201: Obtain the current hydrogen circulation pump speed, current stack inlet hydrogen pressure and current stack outlet hydrogen pressure corresponding to the current power density value during the operation of the fuel cell system on the new energy vehicle, and determine the current stack inlet and outlet hydrogen pressure difference based on the current stack inlet hydrogen pressure and the current stack outlet hydrogen pressure.

[0038] In practical applications, see Figure 1 As shown, in the anode system, a speed sensor is usually provided on the hydrogen circulation pump ARB ( Figure 1 (not shown in the figure), a first pressure sensor PT1 is usually provided at the inlet of the fuel cell stack, and a second pressure sensor PT2 is usually provided at the outlet of the fuel cell stack. Based on this, during the operation of the fuel cell system on a new energy vehicle, on the one hand, the current electric density value can be determined, and on the other hand, the hydrogen circulation pump speed collected by the speed sensor arranged on the hydrogen circulation pump ARB can be obtained as the current hydrogen circulation pump speed corresponding to the current electric density value, the hydrogen pressure at the inlet of the fuel cell stack collected by the first pressure sensor PT1 arranged at the inlet of the fuel cell stack is obtained as the current hydrogen pressure at the inlet of the fuel cell stack corresponding to the current electric density value, and the hydrogen pressure at the outlet of the fuel cell stack collected by the second pressure sensor PT2 arranged at the outlet of the fuel cell stack is obtained as the current hydrogen pressure at the outlet of the fuel cell stack corresponding to the current electric density value.

[0039] Step 202: Based on the first mapping relationship between the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current electric density value and the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet, the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current hydrogen circulation pump speed, the current hydrogen pressure at the stack inlet and the current hydrogen pressure difference at the stack inlet and outlet is determined as the current actual measured value of the hydrogen flow rate at the stack inlet; wherein the first mapping relationship is measured and calibrated when there is no hydrogen leakage in the anode system of the fuel cell system.

[0040] In practical applications, in order to detect the hydrogen flow rate at the inlet of the fuel cell stack without adding additional flow sensors and other components during the operation of the fuel cell system on new energy vehicles, the first mapping relationship between the measured value of the hydrogen flow rate at the inlet of the fuel cell stack corresponding to different electrical density values ​​and the speed of the hydrogen circulation pump, the hydrogen pressure at the inlet of the fuel cell stack and the hydrogen pressure difference at the inlet and outlet of the fuel cell stack can be measured and calibrated in advance on a calibration bench. Specifically, the following methods can be used, but are not limited to:

[0041] Firstly, under the condition that there is no hydrogen leakage in the anode system of the fuel cell system, the actual measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to each set electrical density value during the operation of the fuel cell system on the calibration test bench are obtained.

[0042] In the specific implementation, in order to ensure that there is no hydrogen leakage in the anode system, the anode system in the fuel cell system can be firstly tested for air tightness. After it is determined based on the air tightness test result that there is no hydrogen leakage in the anode system in the fuel cell system, the actual measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the inlet of the fuel cell stack, the hydrogen pressure at the outlet of the fuel cell stack and the hydrogen flow rate at the inlet of the fuel cell stack corresponding to each set air tightness value during the operation of the fuel cell system on the calibration bench are obtained. In practical applications, during the calibration process of the first mapping relationship, refer to Figure 1 As shown, in the anode system, in addition to the rotation speed sensor ( Figure 1 Not shown), a first pressure sensor PT1 is provided at the inlet of the fuel cell stack, a second pressure sensor PT2 is provided at the outlet of the fuel cell stack, and a flow sensor is also provided at the inlet of the fuel cell stack. Based on this, during the calibration process of the first mapping relationship, for each set electrical density value, in the process of controlling the fuel cell to operate according to the set electrical density value on the calibration bench, the speed of the hydrogen circulation pump collected by the speed sensor provided on the hydrogen circulation pump ARB can be obtained as the speed of the hydrogen circulation pump corresponding to the set electrical density value, the hydrogen pressure at the inlet of the fuel cell stack collected by the first pressure sensor PT1 provided at the inlet of the fuel cell stack is obtained as the hydrogen pressure at the inlet of the fuel cell stack corresponding to the set electrical density value, and the setting The hydrogen pressure at the stack outlet collected by the second pressure sensor PT2 at the stack outlet is used as the hydrogen pressure at the stack outlet corresponding to the set electrical density value, and the hydrogen flow at the stack inlet collected by the flow sensor arranged at the stack inlet is obtained as the actual measured value of the hydrogen flow at the stack inlet corresponding to the set electrical density value, so that the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the actual measured values ​​of the hydrogen flow at the stack inlet corresponding to each set electrical density value can be obtained, and the flow sensor arranged at the stack inlet can be removed after the first mapping relationship calibration is completed, so that the detection of the hydrogen flow rate at the stack inlet can be realized without adding additional flow sensors and other components.

[0043] Then, based on the measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to each set electric density value, the measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to different electric density values ​​are fitted.

[0044] In practical applications, in order to reduce the number of calibration times and improve calibration efficiency, the actual measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to each set electrical density value can be measured to obtain the actual measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to each set electrical density value as shown in Table 1. Based on the actual measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to each set electrical density value, the actual measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to different electrical density values ​​are fitted.

[0045] Table 1.

[0046] Set electric density value / (A / cm2) 0.1 0.2 0.3 … Hydrogen circulation pump speed / rpm 1000 2000 3000 … Hydrogen pressure at the fuel cell inlet / kpa 110 120 130 … Hydrogen pressure at stack outlet / kpa 101 105 110 … Measured value of hydrogen flow at the fuel cell stack inlet / SLPM 100 200 300 …

[0047] Finally, based on the measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to different electrical density values, the first mapping relationship between the measured values ​​of the hydrogen flow rate at the stack inlet corresponding to different electrical density values ​​and the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet is determined.

[0048] In practical applications, after obtaining the measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to different electric density values, the hydrogen pressure difference at the stack inlet and outlet corresponding to different electric density values ​​can be calculated first based on the hydrogen pressure at the stack inlet and the hydrogen pressure at the stack outlet corresponding to different electric density values, and then based on the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet, the hydrogen pressure difference at the stack inlet and outlet and the measured values ​​of the hydrogen flow rate at the stack inlet corresponding to different electric density values, a first mapping relationship between the measured values ​​of the hydrogen flow rate at the stack inlet corresponding to different electric density values ​​and the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet is determined, for example, as shown in Table 2.

[0049] Table 2.

[0050] Electric density value / (A / cm2) 0.1 … 0.2 … Hydrogen circulation pump speed / rpm 1000 … 2000 … Hydrogen pressure at the fuel cell inlet / kpa 110 … 120 … Hydrogen pressure at stack outlet / kpa 101 … 105 … Hydrogen pressure difference between the inlet and outlet of the fuel cell stack / kpa 9 … 15 … Measured value of hydrogen flow at the fuel cell stack inlet / SLPM 100 … 200 …

[0051] After the calibration of the first mapping relationship is completed, during the operation of the fuel cell system on the new energy vehicle, the first mapping relationship between the actual measured value of the hydrogen flow rate at the stack inlet corresponding to different electric density values ​​and the speed of the hydrogen circulation pump, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet is determined. Based on the first mapping relationship between the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current electric density value and the speed of the hydrogen circulation pump, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet, the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current hydrogen circulation pump speed, the current hydrogen pressure at the stack inlet and the current hydrogen pressure difference at the stack inlet and outlet is determined as the current measured value of the hydrogen flow rate at the stack inlet.

[0052] Step 203: Based on the second mapping relationship between the theoretical value of hydrogen flow at the stack inlet and the electric density value corresponding to the fuel cell system, the theoretical value of hydrogen flow at the stack inlet corresponding to the current electric density value is determined as the current theoretical value of hydrogen flow at the stack inlet.

[0053] In practical applications, the second mapping relationship can be obtained from the instruction manual of the fuel cell system, or it can be obtained by theoretical deduction based on various parameters of the fuel cell system. Based on this, during the operation of the fuel cell system on a new energy vehicle, the theoretical value of the hydrogen flow rate at the stack inlet corresponding to the current electric density value can be determined as the current theoretical value of the hydrogen flow rate at the stack inlet based on the second mapping relationship between the theoretical value of the hydrogen flow rate at the stack inlet corresponding to the fuel cell system and the electric density value.

[0054] Step 204: Based on the actual value of the hydrogen flow rate at the current fuel cell stack inlet and the theoretical value of the hydrogen flow rate at the current fuel cell stack inlet, determine the current hydrogen leakage detection result of the anode system in the fuel cell system.

[0055] In the specific implementation, the flow difference between the current measured value of the hydrogen flow at the inlet of the fuel cell stack and the current theoretical value of the hydrogen flow at the inlet of the fuel cell stack can be determined as the current hydrogen leakage detection result of the anode system in the fuel cell system, thereby realizing the quantitative detection of the hydrogen leakage of the anode system by using the current measured value of the hydrogen flow at the inlet of the fuel cell stack and the current theoretical value of the hydrogen flow at the inlet of the fuel cell stack, and then the new energy vehicle can be triggered to alarm in time when it is determined that the hydrogen leakage amount exceeds the limit value, that is, the flow difference between the current measured value of the hydrogen flow at the inlet of the fuel cell stack and the current theoretical value of the hydrogen flow at the inlet of the fuel cell stack is determined as the hydrogen leakage amount, and a hydrogen leakage alarm is issued when the hydrogen leakage amount is not lower than the set threshold, thereby effectively ensuring the safety of new energy vehicles and personnel and realizing timely maintenance of the fuel cell system.

[0056] Based on the above embodiments, the present application also provides a hydrogen leakage detection device, see Figure 3 As shown, the hydrogen leakage detection device 300 provided in the embodiment of the present application at least includes:

[0057] The data acquisition unit 301 is used to obtain the current hydrogen circulation pump speed, the current fuel cell stack inlet hydrogen pressure and the current fuel cell stack outlet hydrogen pressure corresponding to the current power density value during the operation of the fuel cell system on the new energy vehicle, and determine the current fuel cell stack inlet and outlet hydrogen pressure difference based on the current fuel cell stack inlet hydrogen pressure and the current fuel cell stack outlet hydrogen pressure;

[0058] The first determination unit 302 is used to determine the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current hydrogen circulation pump speed, the current hydrogen pressure at the stack inlet and the current hydrogen pressure difference at the stack inlet and outlet as the actual measured value of the hydrogen flow rate at the stack inlet based on the first mapping relationship between the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current electric density value and the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet; wherein the first mapping relationship is measured and calibrated when there is no hydrogen leakage in the anode system of the fuel cell system;

[0059] The second determining unit 303 is used to determine the theoretical value of the hydrogen flow rate at the inlet of the stack corresponding to the current power density value as the current theoretical value of the hydrogen flow rate at the inlet of the stack based on the second mapping relationship between the theoretical value of the hydrogen flow rate at the inlet of the stack corresponding to the fuel cell system and the power density value;

[0060] The leakage detection unit 304 is used to determine the current hydrogen leakage detection result of the anode system in the fuel cell system based on the current measured value of the hydrogen flow at the inlet of the fuel cell stack and the current theoretical value of the hydrogen flow at the inlet of the fuel cell stack.

[0061] In a possible implementation, the hydrogen leakage detection device 300 provided in the embodiment of the present application further includes:

[0062] The relationship calibration unit 305 is used to obtain the actual measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to each set electric density value during the operation of the fuel cell system on the calibration test bench when there is no hydrogen leakage in the anode system of the fuel cell system; based on the actual measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to each set electric density value, fit the actual measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to different electric density values; based on the actual measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to different electric density values, determine the first mapping relationship between the actual measured values ​​of the hydrogen flow rate at the stack inlet corresponding to different electric density values ​​and the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet.

[0063] In one possible implementation, the relationship calibration unit 305 is specifically used to control the fuel cell to operate according to the set electrical density value on the calibration test bench for each set electrical density value, obtain the hydrogen circulation pump speed collected by the speed sensor arranged on the hydrogen circulation pump as the hydrogen circulation pump speed corresponding to the set electrical density value, obtain the stack inlet hydrogen pressure collected by the first pressure sensor arranged at the stack inlet as the stack inlet hydrogen pressure corresponding to the set electrical density value, obtain the stack outlet hydrogen pressure collected by the second pressure sensor arranged at the stack outlet as the stack outlet hydrogen pressure corresponding to the set electrical density value, and obtain the stack inlet hydrogen flow collected by the flow sensor arranged at the stack inlet as the stack inlet hydrogen flow actual measured value corresponding to the set electrical density value.

[0064] In one possible implementation, the data acquisition unit 301 is specifically used to determine the current electric density value during the operation of the fuel cell system on a new energy vehicle, obtain the hydrogen circulation pump speed collected by the speed sensor arranged on the hydrogen circulation pump as the current hydrogen circulation pump speed corresponding to the current electric density value, obtain the hydrogen pressure at the inlet of the fuel cell stack collected by the first pressure sensor arranged at the inlet of the fuel cell stack as the current hydrogen pressure at the inlet of the fuel cell stack corresponding to the current electric density value, and obtain the hydrogen pressure at the outlet of the fuel cell stack collected by the second pressure sensor arranged at the outlet of the fuel cell stack as the current hydrogen pressure at the outlet of the fuel cell stack corresponding to the current electric density value.

[0065] In a possible implementation, the leakage detection unit 304 is specifically used to determine the flow difference between the current measured value of the hydrogen flow at the fuel cell stack inlet and the current theoretical value of the hydrogen flow at the fuel cell stack inlet as the current hydrogen leakage detection result of the anode system in the fuel cell system.

[0066] It should be noted that the principle of solving the technical problem by the hydrogen leakage detection device 300 provided in the embodiment of the present application is similar to the hydrogen leakage detection method provided in the embodiment of the present application. Therefore, the implementation of the hydrogen leakage detection device 300 provided in the embodiment of the present application can refer to the implementation of the hydrogen leakage detection method provided in the embodiment of the present application, and the repeated parts will not be repeated.

[0067] After introducing the hydrogen leakage detection method and device provided in the embodiment of the present application, the fuel cell control device provided in the embodiment of the present application is briefly introduced next.

[0068] The fuel cell control device provided in the embodiment of the present application may be, but is not limited to, an FCU, an HCU, etc. For details, see Figure 4As shown, the fuel cell control device 400 provided in the embodiment of the present application includes at least a processor 401, a memory 402, and a computer program stored in the memory 402 and executable on the processor 401. When the processor 401 executes the computer program, the hydrogen leakage detection method provided in the embodiment of the present application is implemented.

[0069] The fuel cell control device 400 provided in the embodiment of the present application may also include a bus 403 connecting different components (including the processor 401 and the memory 402). The bus 403 represents one or more of several types of bus structures, including a memory bus, a peripheral bus, a local bus, and the like.

[0070] The memory 402 may include a readable medium in the form of a volatile memory, such as a RAM (Random Access Memory) 4021 and / or a cache memory 4022, and may further include a ROM (Read Only Memory) 4023. The memory 402 may also include a program tool 4025 having a group (at least one) of program modules 4024, and the program modules 4024 include but are not limited to: an operating subsystem, one or more application programs, other program modules, and program data, each of which or some combination may include the implementation of a network environment.

[0071] The fuel cell control device 400 may also communicate with one or more external devices 404 (e.g., keyboards, remote controls, etc.), and may also communicate with one or more devices that enable a user to interact with the fuel cell control device 400 (e.g., mobile phones, computers, etc.), and / or communicate with any device that enables the fuel cell control device 400 to communicate with one or more other fuel cell control devices 400 (e.g., routers, modems, etc.). Such communication may be performed through an I / O (Input / Output) interface 405. Furthermore, the fuel cell control device 400 may also communicate with one or more networks (e.g., LAN (Local Area Network), WAN (Wide Area Network) and / or public networks, such as the Internet) through a network adapter 406. Figure 4 As shown, the network adapter 406 communicates with other modules of the fuel cell control device 400 via the bus 403. It should be understood that although Figure 4Not shown, other hardware and / or software modules may be used in conjunction with the fuel cell control device 400, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (Redundant Arrays of Independent Disks) subsystems, tape drives, and data backup storage subsystems.

[0072] It should be noted that Figure 4 The fuel cell control device 400 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0073] Based on the above embodiments, an embodiment of the present application also provides a fuel cell system, which fuel cell system at least includes a fuel cell stack, an anode system for supplying hydrogen to the fuel cell stack, a cathode system for supplying air to the fuel cell stack, a cooling system for cooling the fuel cell stack, and the above-mentioned fuel cell control device provided in the embodiment of the present application.

[0074] In addition, an embodiment of the present application also provides a new energy vehicle, which includes at least a body, a chassis frame, wheels, an electric motor, a vehicle control system, and the above-mentioned fuel cell system provided in an embodiment of the present application.

[0075] In addition, the embodiment of the present application further provides a computer-readable storage medium, which stores computer instructions, and when the computer instructions are executed by the processor, the hydrogen leakage detection method provided in the embodiment of the present application is implemented. Specifically, the computer instructions can be built-in or installed in the processor, so that the processor can implement the hydrogen leakage detection method provided in the embodiment of the present application by executing the built-in or installed computer instructions.

[0076] In addition, the hydrogen leakage detection method provided in the embodiment of the present application can also be implemented as a program product, which includes a program code. When the program code is executed by a processor, the hydrogen leakage detection method provided in the embodiment of the present application is implemented.

[0077] The program product provided in the embodiments of the present application may adopt any combination of one or more readable media, wherein the readable medium may be a readable signal medium or a readable storage medium, and the readable storage medium may be but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any combination of the above. Specifically, more specific examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable disk, a hard disk, RAM, ROM, EPROM (Erasable Programmable Read Only Memory), optical fiber, CD-ROM (Compact Disc Read-Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0078] The program product provided in the embodiment of the present application may adopt a CD-ROM and include program code, and may also be run on a fuel cell control device such as an FCU, HCU, etc. However, the program product provided in the embodiment of the present application is not limited thereto, and in the embodiment of the present application, the readable storage medium may be any tangible medium containing or storing a program, and the program may be used by or in combination with an instruction execution system, apparatus, or device.

[0079] It should be noted that, although several units or subunits of the device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more units described above can be embodied in one unit. Conversely, the features and functions of one unit described above can be further divided into multiple units to be embodied.

[0080] In addition, although the operations of the method of the present application are described in a specific order in the drawings, this does not require or imply that the operations must be performed in this specific order, or that all the operations shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0081] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0082] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for detecting hydrogen leakage, characterized in that: include: Obtain the current hydrogen circulation pump speed, the current fuel cell stack inlet hydrogen pressure and the current fuel cell stack outlet hydrogen pressure corresponding to the current power density value during the operation of the fuel cell system on the new energy vehicle, and determine the current fuel cell stack inlet and outlet hydrogen pressure difference based on the current fuel cell stack inlet hydrogen pressure and the current fuel cell stack outlet hydrogen pressure; Based on a first mapping relationship between the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current electric density value and the speed of the hydrogen circulation pump, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet, the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current speed of the hydrogen circulation pump, the current hydrogen pressure at the stack inlet and the current hydrogen pressure difference at the stack inlet and outlet is determined as the actual measured value of the hydrogen flow rate at the stack inlet; wherein the first mapping relationship is measured and calibrated when there is no hydrogen leakage in the anode system of the fuel cell system; Based on a second mapping relationship between the theoretical value of hydrogen flow at the stack inlet corresponding to the fuel cell system and the electric density value, the theoretical value of hydrogen flow at the stack inlet corresponding to the current electric density value is determined as the current theoretical value of hydrogen flow at the stack inlet; Based on the current measured value of the hydrogen flow rate at the fuel cell stack inlet and the current theoretical value of the hydrogen flow rate at the fuel cell stack inlet, a current hydrogen leakage detection result of the anode system in the fuel cell system is determined.

2. The hydrogen leakage detection method according to claim 1, characterized in that: Before obtaining the current hydrogen circulation pump speed, the current stack inlet hydrogen pressure and the current stack outlet hydrogen pressure corresponding to the current electric density value during the operation of the fuel cell system on the new energy vehicle, it also includes: In the case where there is no hydrogen leakage in the anode system of the fuel cell system, the actual measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the inlet of the fuel cell stack, the hydrogen pressure at the outlet of the fuel cell stack and the hydrogen flow rate at the inlet of the fuel cell stack corresponding to each set electric density value during the operation of the fuel cell system on the calibration bench are obtained; Based on the measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the fuel cell stack inlet, the hydrogen pressure at the fuel cell stack outlet and the hydrogen flow rate at the fuel cell stack inlet corresponding to the respective set power density values, the measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the fuel cell stack inlet, the hydrogen pressure at the fuel cell stack outlet and the hydrogen flow rate at the fuel cell stack inlet corresponding to different power density values ​​are fitted; Based on the measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet, the hydrogen pressure at the stack outlet and the hydrogen flow rate at the stack inlet corresponding to different electrical density values, the first mapping relationship between the measured values ​​of the hydrogen flow rate at the stack inlet corresponding to different electrical density values ​​and the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet is determined.

3. The hydrogen leakage detection method according to claim 2, characterized in that: Obtaining the measured values ​​of the hydrogen circulation pump speed, the hydrogen pressure at the inlet of the fuel cell stack, the hydrogen pressure at the outlet of the fuel cell stack, and the hydrogen flow rate at the inlet of the fuel cell stack corresponding to each set electric density value during the operation of the fuel cell system on the calibration bench, including: For each set electrical density value, in the process of controlling the fuel cell to operate on the calibration bench according to the set electrical density value, the speed of the hydrogen circulation pump collected by the speed sensor arranged on the hydrogen circulation pump is obtained as the hydrogen circulation pump speed corresponding to the set electrical density value, the hydrogen pressure at the stack inlet collected by the first pressure sensor arranged at the stack inlet is obtained as the hydrogen pressure at the stack inlet corresponding to the set electrical density value, the hydrogen pressure at the stack outlet collected by the second pressure sensor arranged at the stack outlet is obtained as the hydrogen pressure at the stack outlet corresponding to the set electrical density value, and the hydrogen flow rate at the stack inlet collected by the flow sensor arranged at the stack inlet is obtained as the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the set electrical density value.

4. The hydrogen leakage detection method according to claim 1, characterized in that: Obtain the current hydrogen circulation pump speed, current stack inlet hydrogen pressure and current stack outlet hydrogen pressure corresponding to the current electric density value during the operation of the fuel cell system on the new energy vehicle, including: During the operation of the fuel cell system on the new energy vehicle, the current electric density value is determined, the speed of the hydrogen circulation pump collected by the speed sensor arranged on the hydrogen circulation pump is obtained as the current hydrogen circulation pump speed corresponding to the current electric density value, the hydrogen pressure at the inlet of the fuel cell stack collected by the first pressure sensor arranged at the inlet of the fuel cell stack is obtained as the current inlet hydrogen pressure of the fuel cell stack corresponding to the current electric density value, and the hydrogen pressure at the outlet of the fuel cell stack collected by the second pressure sensor arranged at the outlet of the fuel cell stack is obtained as the current outlet hydrogen pressure of the fuel cell stack corresponding to the current electric density value.

5. The hydrogen leakage detection method according to any one of claims 1 to 4, characterized in that: Determining a current hydrogen leakage detection result of the anode system in the fuel cell system based on the current measured value of the hydrogen flow rate at the fuel cell stack inlet and the current theoretical value of the hydrogen flow rate at the fuel cell stack inlet includes: The flow difference between the current measured value of the hydrogen flow at the fuel cell stack inlet and the current theoretical value of the hydrogen flow at the fuel cell stack inlet is determined as the current hydrogen leakage detection result of the anode system in the fuel cell system.

6. A hydrogen leakage detection device, characterized in that: include: A data acquisition unit, used to obtain the current hydrogen circulation pump speed, the current fuel cell stack inlet hydrogen pressure and the current fuel cell stack outlet hydrogen pressure corresponding to the current power density value during the operation of the fuel cell system on the new energy vehicle, and determine the current fuel cell stack inlet and outlet hydrogen pressure difference based on the current fuel cell stack inlet hydrogen pressure and the current fuel cell stack outlet hydrogen pressure; a first determination unit, for determining the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current hydrogen circulation pump speed, the current hydrogen pressure at the stack inlet and the current hydrogen pressure difference at the stack inlet and outlet as the actual measured value of the hydrogen flow rate at the stack inlet based on a first mapping relationship between the actual measured value of the hydrogen flow rate at the stack inlet corresponding to the current electric density value and the hydrogen circulation pump speed, the hydrogen pressure at the stack inlet and the hydrogen pressure difference at the stack inlet and outlet; wherein the first mapping relationship is measured and calibrated when there is no hydrogen leakage in the anode system of the fuel cell system; A second determining unit is used to determine the theoretical value of the hydrogen flow rate at the stack inlet corresponding to the current power density value as the current theoretical value of the hydrogen flow rate at the stack inlet based on a second mapping relationship between the theoretical value of the hydrogen flow rate at the stack inlet corresponding to the fuel cell system and the power density value; The leakage detection unit is used to determine the current hydrogen leakage detection result of the anode system in the fuel cell system based on the current measured value of the hydrogen flow at the inlet of the fuel cell stack and the current theoretical value of the hydrogen flow at the inlet of the fuel cell stack.

7. A fuel cell control device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the hydrogen leakage detection method according to any one of claims 1 to 5 when executing the computer program.

8. A fuel cell system comprising a fuel cell stack, an anode system for supplying hydrogen to the fuel cell stack, a cathode system for supplying air to the fuel cell stack, and a cooling system for cooling the fuel cell stack, characterized in that: Also included is the fuel cell control device as claimed in claim 7.

9. A new energy vehicle, comprising a vehicle body, a chassis frame, wheels, an electric motor, and a vehicle control system, characterized in that: Also included is the fuel cell system as claimed in claim 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, the hydrogen leakage detection method according to any one of claims 1 to 5 is implemented.

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