Control method and device of fuel cell engine and vehicle

Abstract

The invention relates to a control method and device of a fuel cell engine and a vehicle, the fuel cell engine comprises a cell stack and gas buffer equipment, a gas outlet of the gas buffer equipment is connected with a gas inlet of the cell stack, and the method comprises the following steps: obtaining a first gas temperature of the gas inlet of the cell stack, and adjusting the gas mass flow rate of the gas inlet of the gas buffer equipment according to the first gas temperature and a preset temperature threshold so as to obtain a second gas temperature of the gas inlet of the cell stack, and controlling the fuel cell engine to start according to the second gas temperature.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, in particular to a control method and device of a fuel cell engine and a vehicle. BACKGROUND

[0002] With the development of new energy technology, fuel cell vehicles use hydrogen energy as fuel, have the advantages of high power and long endurance, and gradually become an important development direction of new energy vehicles.

[0003] However, the current fuel cell cannot accurately control the temperature of hydrogen entering the battery stack, which affects the starting performance of the engine, shortens the service life of the engine, and affects the stability and safety of the vehicle. SUMMARY

[0004] To solve the above problems, the present disclosure provides a control method and device of a fuel cell engine and a vehicle.

[0005] According to a first aspect of the embodiments of the present disclosure, a control method of a fuel cell engine is provided, the fuel cell engine comprising a battery stack and a gas buffer device, an outlet of the gas buffer device and an inlet of the battery stack are connected, the method comprising: obtaining a first gas temperature of the inlet of the battery stack; adjusting a gas mass flow of the inlet of the gas buffer device according to the first gas temperature and a preset temperature threshold, to obtain a second gas temperature of the inlet of the battery stack; controlling the fuel cell engine to start according to the second gas temperature.

[0006] Optionally, the adjusting the gas mass flow of the inlet of the gas buffer device according to the first gas temperature and the preset temperature threshold to obtain the second gas temperature of the inlet of the battery stack comprises: in the case that the first gas temperature is less than the preset temperature threshold, adjusting the gas mass flow of the inlet of the gas buffer device according to the first gas temperature and the preset temperature threshold.

[0007] Optionally, the adjusting the gas mass flow of the inlet of the gas buffer device according to the first gas temperature and the preset temperature threshold comprises: determining a third gas temperature of the inlet of the gas buffer device according to the first gas temperature and the preset temperature threshold; determining a target gas mass flow according to the third gas temperature according to a temperature flow correspondence relationship; the temperature flow correspondence relationship comprises a correspondence relationship between the gas temperature and the gas mass flow at the inlet of the gas buffer device; adjusting the gas mass flow to the target gas mass flow.

[0008] Optionally, the determining the third gas temperature of the gas inlet of the gas buffer device according to the first gas temperature and the preset temperature threshold comprises: acquiring a gas pressure in the gas buffer device; acquiring a quantity of substance of the gas entering the gas buffer device in a specified time period; and determining the third gas temperature according to the first gas temperature, the preset temperature threshold, the gas pressure and the quantity of substance.

[0009] Optionally, the fuel cell engine further comprises a gasification device, an outlet of the gasification device being connected to the gas inlet of the gas buffer device; and the temperature-flow rate correspondence is determined in advance by: acquiring a fourth gas temperature of a gas inlet of the gasification device in a historical time period; acquiring a first liquid temperature of a liquid inlet of the gasification device, a second liquid temperature of a liquid outlet of the gasification device and a liquid mass flow rate of a liquid in the gasification device in the historical time period; and determining the temperature-flow rate correspondence according to the fourth gas temperature, the first liquid temperature, the second liquid temperature and the liquid mass flow rate.

[0010] Optionally, the fuel cell engine further comprises a flow rate adjusting device, the outlet of the gasification device being connected to the gas inlet of the gas buffer device through the flow rate adjusting device, the flow rate adjusting device comprising an ejector and a solenoid valve; and the adjusting the gas mass flow rate to the target gas mass flow rate comprises: in a case where the target gas mass flow rate is less than or equal to a maximum gas supply flow rate of the fuel cell engine, adjusting the gas mass flow rate by the ejector; or in a case where the target gas mass flow rate is greater than the maximum gas supply flow rate, adjusting the gas mass flow rate by the solenoid valve.

[0011] Optionally, the controlling the fuel cell engine to start according to the second gas temperature comprises: in a case where the second gas temperature is greater than or equal to the preset temperature threshold, controlling the fuel cell engine to start.

[0012] Optionally, the method further comprises: acquiring a gas pressure in the gas buffer device; determining an output power capacity of the fuel cell engine according to the gas pressure; in a case where the output power capacity is greater than or equal to a vehicle demand power, taking the vehicle demand power as an output power of the fuel cell engine; or in a case where the output power capacity is less than the vehicle demand power, taking the output power capacity as the output power of the fuel cell engine.

[0013] According to a second aspect of the embodiments of the present disclosure, a control device of a fuel cell engine is provided, the fuel cell engine comprising a cell stack and a gas buffer device, an outlet of the gas buffer device being connected to an inlet of the cell stack, the device comprising: a first gas temperature of the inlet of the cell stack; an adjustment module configured to adjust a mass flow rate of gas at the inlet of the gas buffer device according to the first gas temperature and a preset temperature threshold, so as to obtain a second gas temperature of the inlet of the cell stack; a control module configured to control the fuel cell engine to start up according to the second gas temperature.

[0014] Optionally, the adjustment module is configured to adjust the mass flow rate of gas at the inlet of the gas buffer device according to the first gas temperature and the preset temperature threshold, in a case where the first gas temperature is less than the preset temperature threshold.

[0015] Optionally, the adjustment module is configured to determine a third gas temperature at the inlet of the gas buffer device according to the first gas temperature and the preset temperature threshold; determine a target mass flow rate of gas according to the third gas temperature, according to a temperature-flow rate correspondence relationship; the temperature-flow rate correspondence relationship comprises a correspondence relationship between a gas temperature and a mass flow rate of gas at the inlet of the gas buffer device; and adjust the mass flow rate of gas to the target mass flow rate of gas.

[0016] Optionally, the adjustment module is configured to obtain a gas pressure in the gas buffer device; obtain a quantity of substance of gas entering the gas buffer device within a specified time period; and determine the third gas temperature according to the first gas temperature, the preset temperature threshold, the gas pressure and the quantity of substance.

[0017] Optionally, the fuel cell engine further comprises a gasification device, an outlet of the gasification device being connected to an inlet of the gas buffer device; and the temperature-flow rate correspondence relationship is determined in advance by the following manner: the obtaining module is configured to obtain a fourth gas temperature at the inlet of the gasification device within a historical time period; obtain a first liquid temperature at a liquid inlet of the gasification device, a second liquid temperature at a liquid outlet of the gasification device, and a liquid mass flow rate of liquid in the gasification device within the historical time period; and determine the temperature-flow rate correspondence relationship according to the fourth gas temperature, the first liquid temperature, the second liquid temperature and the liquid mass flow rate.

[0018] Optionally, the fuel cell engine further comprises a flow regulating device, the gas outlet of the gasification device is connected with the gas inlet of the gas buffer device through the flow regulating device, the flow regulating device comprises an ejector and a solenoid valve; the regulating module is configured to, in a case where the target gas mass flow is less than or equal to a maximum gas supply flow of the fuel cell engine, regulate the gas mass flow through the ejector, or in a case where the target gas mass flow is greater than the maximum gas supply flow, regulate the gas mass flow through the solenoid valve.

[0019] Optionally, the control module is configured to, in a case where the second gas temperature is greater than or equal to the preset temperature threshold, control the fuel cell engine to start.

[0020] Optionally, the control module is further configured to acquire a gas pressure in the gas buffer device; determine an output power capacity of the fuel cell engine according to the gas pressure; in a case where the output power capacity is greater than or equal to a vehicle demand power, take the vehicle demand power as the output power of the fuel cell engine; or in a case where the output power capacity is less than the vehicle demand power, take the output power capacity as the output power of the fuel cell engine.

[0021] According to a third aspect of the embodiments of the present disclosure, a vehicle is provided, comprising the control device of the fuel cell engine of the second aspect of the present disclosure.

[0022] According to the above technical solution, by acquiring a first gas temperature of an air inlet of a cell stack of the fuel cell engine, and according to the first gas temperature and a preset temperature threshold, adjusting a gas mass flow of a gas inlet of a gas buffer device of the fuel cell engine to obtain a second gas temperature of the air inlet of the cell stack, and according to the second gas temperature, controlling the fuel cell engine to start. In this way, the hydrogen flow of the gas inlet of the gas buffer device of the fuel cell engine can be controlled according to the hydrogen temperature of the air inlet of the cell stack of the fuel cell engine, the hydrogen temperature entering the cell stack can be accurately controlled, the safe and stable start of the engine under different external environmental conditions can be realized, the service life of the engine can be prolonged, and the stability and safety of the vehicle can be improved.

[0023] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation of the present disclosure. In the drawings: Figure 1is a flow chart of a control method of a fuel cell engine according to an example embodiment.

[0025] Figure 2 is a flow chart of another control method of a fuel cell engine according to an example embodiment.

[0026] Figure 3 is a block diagram of a control device of a fuel cell engine according to an example embodiment.

[0027] Figure 4 is a block diagram of an electronic device according to an example embodiment of the present disclosure.

[0028] Figure 5 is a block diagram of a vehicle according to an example embodiment of the present disclosure. DETAILED DESCRIPTION

[0029] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0030] In the following description, the words "first", "second", and the like, are used only to distinguish the described objects, and cannot be understood as indicating or implying relative importance, nor indicating or implying an order.

[0031] First, the application scenario of the present disclosure is described. The present disclosure is applied to the application scenario of controlling a fuel cell engine of a fuel cell vehicle, the fuel cell engine comprising a liquid gas storage device, a gasification device, a flow regulating device, a gas buffer device and a battery stack connected in sequence. The liquid gas in the liquid gas storage device is converted into gaseous gas through heat exchange of the gasification device, and the gas pressure is stored and regulated through the gas buffer device, so as to supply gas to the battery stack, and realize the start of the fuel cell engine.

[0032] In the related art, with the development of new energy technology, fuel cell vehicles use hydrogen energy as fuel, have the advantages of high power and long endurance, and gradually become an important development direction of new energy vehicles. However, the current fuel cell cannot accurately control the hydrogen temperature entering the battery stack, which affects the starting performance of the engine, shortens the service life of the engine, and affects the stability and safety of the vehicle.

[0033] To solve the above problems, the present disclosure provides a fuel cell engine control method, device, electronic equipment and vehicle, which can obtain the first gas temperature of the gas inlet of the battery stack of the fuel cell engine, adjust the gas mass flow of the gas inlet of the gas buffer device of the fuel cell engine according to the first gas temperature and the preset temperature threshold, obtain the second gas temperature of the gas inlet of the battery stack, and control the fuel cell engine to start according to the second gas temperature. In this way, the hydrogen flow of the gas inlet of the gas buffer device of the fuel cell engine can be controlled according to the hydrogen temperature of the gas inlet of the battery stack of the fuel cell engine, the hydrogen temperature entering the battery stack can be accurately controlled, the engine can be safely and stably started under different external environmental conditions, the service life of the engine is prolonged, and the stability and safety of the vehicle are improved.

[0034] The present disclosure will be described below in conjunction with specific embodiments.

[0035] Figure 1 is a flow chart of a control method of a fuel cell engine according to an exemplary embodiment, as shown in Figure 1 The method can include the following steps: In step S101, the first gas temperature of the gas inlet of the battery stack of the fuel cell engine is obtained.

[0036] The fuel cell engine can include a liquid gas storage device, a gasification device, a flow regulating device, a gas buffer device and a battery stack connected in sequence, the gas can be hydrogen, the gasification device is used to convert the liquid gas from the liquid gas storage device into gaseous gas through heat exchange, the flow regulating device is used to regulate the gas flow entering the gas buffer device, the gas buffer device is used to store gaseous gas and regulate the pressure of gaseous gas, and the battery stack is used to receive the gas transmitted by the gas buffer device and convert the chemical energy of the gas into electrical energy through an electrochemical reaction to drive the vehicle. For example, when the ECU (Electronic Control Unit) of the vehicle determines that the fuel cell engine starts at low temperature (such as ambient temperature less than 0℃), the battery stack needs to perform an electrochemical reaction at this time, the first gas temperature of the gas inlet of the battery stack can be obtained. The first gas temperature can be obtained by a temperature sensing device such as a temperature sensor.

[0037] In step S102, the gas mass flow of the gas inlet of the gas buffer device of the fuel cell engine is adjusted according to the first gas temperature and the preset temperature threshold, so as to obtain the second gas temperature of the gas inlet of the battery stack.

[0038] The outlet of the gas buffer device is connected with the inlet of the battery stack. The preset temperature threshold can be a lower limit of a temperature at which the battery stack can perform an electrochemical reaction when the fuel cell engine is started at a low temperature, and the preset temperature threshold can be determined in advance by experiment The inlet of the gas buffer device is connected with the outlet of the gasification device of the fuel cell engine through a flow regulating device. The flow regulating device can be an injector or a solenoid valve, and the gas buffer device can be a gas buffer tank. For example, when it is determined by the ECU of the vehicle that the fuel cell engine is started at a low temperature, the mass flow rate of the hydrogen gas at the inlet of the gas buffer device is adjusted by the flow regulating device according to the first temperature and the preset temperature threshold to obtain the second temperature.

[0039] In a possible implementation, the mass flow rate of the hydrogen gas at the inlet of the gas buffer device of the fuel cell engine can be adjusted according to the first temperature and the preset temperature threshold when the first temperature is less than the preset temperature threshold.

[0040] For example, when the first temperature obtained satisfies , the hydrogen gas at the inlet of the battery stack is at a low temperature and cannot reach the lower limit of the temperature at which the battery stack can perform an electrochemical reaction. At this time, the mass flow rate of the hydrogen gas at the inlet of the gas buffer device can be adjusted to increase the hydrogen gas flowing into the gas buffer device, accelerate the thermodynamic reaction in the gas buffer device, and increase the temperature of the hydrogen gas in the gas buffer device, so that the second temperature of the hydrogen gas at the inlet of the battery stack satisfies , reaches the lower limit of the temperature at which the battery stack can perform an electrochemical reaction, thereby ensuring that the battery stack can perform an electrochemical reaction, where is the preset temperature threshold.

[0041] In step S103, the fuel cell engine is controlled to start according to the second temperature.

[0042] The second temperature can be obtained by the ECU of the vehicle, and the fuel cell engine is controlled to start according to the second temperature.

[0043] In a possible implementation, the fuel cell engine can be controlled to start when the second temperature is greater than or equal to the preset temperature threshold.

[0044] For example, in the acquired second gas temperature In the case of satisfying In this case, the hydrogen temperature of the gas inlet of the cell stack has reached the lower limit of the temperature at which the cell stack can perform the electrochemical reaction, and the fuel cell engine can be controlled to start at this time.

[0045] The above technical solution can obtain the first gas temperature of the gas inlet of the cell stack of the fuel cell engine, adjust the gas mass flow of the gas inlet of the gas buffer device of the fuel cell engine according to the first gas temperature and the preset temperature threshold, obtain the second gas temperature of the gas inlet of the cell stack, and control the fuel cell engine to start according to the second gas temperature. In this way, the hydrogen flow of the gas inlet of the gas buffer device of the fuel cell engine can be controlled according to the hydrogen temperature of the gas inlet of the cell stack of the fuel cell engine, the hydrogen temperature entering the cell stack can be accurately controlled, the engine can be safely and stably started under different external environmental conditions, the service life of the engine is prolonged, and the stability and safety of the vehicle are improved.

[0046] In some embodiments, the above step S102 can include the following steps: S1021, determining a third gas temperature of the gas inlet of the gas buffer device according to the first gas temperature and the preset temperature threshold.

[0047] The gas inlet of the gas buffer device is connected with the gas outlet of the gasification device of the fuel cell engine, the gasification device is used for heat exchange of liquid gas, and the gaseous gas formed after heat exchange is transmitted to the gas inlet of the gas buffer device. In addition, during the process of transmitting the gas between the gas buffer device and the cell stack, the proportion of temperature loss of the gas to the third gas temperature is low, and the temperature loss can be ignored. In this way, by determining the third gas temperature, the temperature of the gas inlet of the gas buffer device is subsequently adjusted to the third gas temperature, the gas temperature of the gas inlet of the cell stack can be adjusted, so as to accurately control the hydrogen temperature entering the cell stack, and the engine can be safely and stably started under different external environmental conditions.

[0048] In a possible implementation, the gas pressure in the gas buffer device can be obtained, the amount of substance of the gas entering the gas buffer device within a specified time period can be obtained, and the third gas temperature can be determined according to the first gas temperature, the preset temperature threshold, the gas pressure and the amount of substance.

[0049] The gas pressure can be obtained by a pressure measuring device such as a pressure sensor, the specified time period can include a time period during which the fuel cell engine is started at a low temperature, and the amount of substance can be calculated by obtaining a mass flow rate of the gas into the gas buffer device during the specified time period.

[0050] For example, the third gas temperature can be calculated as follows: First, according to the ideal gas state equation, the amount of substance of the original gas in the gas buffer device is:

[0051] wherein, is the amount of substance of the original gas in the gas buffer device, is the gas pressure in the gas buffer device, is the volume of the gas buffer device, is the first gas temperature, and R is the gas constant.

[0052] Secondly, the amount of substance of the gas into the gas buffer device during the specified time period can be calculated as follows:

[0053] wherein, is the amount of substance of the gas into the gas buffer device during the specified time period, is the mass flow rate of the gas into the gas buffer device during the specified time period, is the length of the specified time period.

[0054] Finally, according to the law of conservation of energy, the total energy of the gas in the gas buffer device is equal to the sum of the energy of the original gas in the gas buffer device and the energy of the gas into the gas buffer device, which can be represented by the following formula:

[0055] wherein, is the specific heat capacity of the gas at constant pressure, is the amount of substance of the original gas in the gas buffer device, is the amount of substance of the gas into the gas buffer device during the specified time period, is the preset temperature threshold, is the third gas temperature, is the first gas temperature.

[0056] Simplifying the above formula, the calculation formula of the third gas temperature can be obtained as follows:

[0057] wherein, is the third gas temperature, is the amount of substance of the original gas in the gas buffer device, is the amount of substance of the gas entering the gas buffer device within a specified time period, is the preset temperature threshold, is the first gas temperature.

[0058] S1022, according to the temperature flow corresponding relationship, determining the target gas mass flow according to the third gas temperature.

[0059] The temperature flow corresponding relationship includes the corresponding relationship between the gas temperature and the gas mass flow at the gas inlet of the gas buffer device. The temperature flow corresponding relationship can include a calculation formula between the gas temperature and the gas mass flow. For example, after the third gas temperature is calculated, the target gas mass flow can be calculated through the calculation formula between the gas temperature and the gas mass flow. Subsequently, the gas mass flow at the gas inlet of the gas buffer device can be adjusted to the target gas mass flow, so as to realize the adjustment of the gas mass flow at the gas inlet of the battery stack, thereby realizing the accurate control of the hydrogen temperature entering the battery stack and realizing the safe and stable start of the engine under different external environmental conditions.

[0060] In a possible implementation, the temperature flow corresponding relationship can be determined in the following manner: obtaining a fourth gas temperature at the gas inlet of the gasification device of the fuel cell engine within a historical time period, obtaining a first liquid temperature at the liquid inlet of the gasification device, a second liquid temperature at the liquid outlet of the gasification device, and a liquid mass flow of the liquid in the gasification device within the historical time period, and determining the temperature flow corresponding relationship according to the fourth gas temperature, the first liquid temperature, the second liquid temperature and the liquid mass flow.

[0061] The historical time period can include a time period before the low-temperature start of the fuel cell engine. The gasification device can be a water bath type gasifier. The gas inlet of the water bath type gasifier is connected to the liquid gas storage device through the air bath type gasifier. The gas outlet of the water bath type gasifier is connected to the gas buffer device through the flow regulating device. The liquid in the gasification device can be engine circulating liquid. The gasification device can heat and warm the liquid gas transmitted by the air bath type gasifier and the engine circulating liquid. The fourth gas temperature, the first liquid temperature and the second liquid temperature can be obtained by a temperature measuring device such as a temperature sensor. The liquid mass flow can be obtained by a flow sensing device such as a flow sensor.

[0062] For example, according to the law of conservation of energy, the following equation can be established:

[0063] The above formula can be transformed to obtain the corresponding relationship between the gas temperature and the gas mass flow of the gas inlet of the gas buffer device, as follows:

[0064] wherein, is the gas temperature of the gas inlet of the gas buffer device, is the constant-pressure specific heat capacity of the engine circulating liquid, is the liquid mass flow of the engine circulating liquid, is the second liquid temperature, is the first liquid temperature, is the working efficiency of the gasification device, the value range of which can be 0.8-0.95, is the constant-pressure specific heat capacity of the gas, is the gas mass flow of the gas inlet of the gas buffer device, is the fourth gas temperature. In addition, the corresponding relationship between the gas temperature and the gas mass flow can be adjusted by adjusting the liquid mass flow of the engine circulating liquid, for example, by reducing the liquid mass flow , at this time, the product of the gas temperature and the gas mass flow is reduced, and the target adjustment amount of the gas temperature is a constant value, thereby compressing the adjustment range of the gas mass flow ; or by increasing the liquid mass flow , at this time, the product of the gas temperature and the gas mass flow is increased, and the target adjustment amount of the gas temperature is a constant value, thereby expanding the adjustment range of the gas mass flow .

[0065] Exemplarily, the value of the third gas temperature is substituted into the above formula, i.e., let , the value of calculated is the target mass flow.

[0066] S1023, adjust the gas mass flow to the target gas mass flow.

[0067] In this way, by adjusting the gas mass flow of the gas inlet of the gas buffer device to the target gas mass flow, the gas mass flow of the gas inlet of the battery stack can be adjusted, so that the hydrogen temperature entering the battery stack can be accurately controlled, and the safe and stable start of the engine under different external environmental conditions can be realized.

[0068] In a possible implementation, the gas mass flow can be adjusted to the target gas mass flow by a flow adjusting device, and the gas outlet of the gasification device is connected to the gas inlet of the gas buffer device through the flow adjusting device. The flow adjusting device can include an injector and a solenoid valve. When the target gas mass flow is less than or equal to the maximum gas supply flow of the fuel cell engine, the gas mass flow can be adjusted by the injector; or when the target gas mass flow is greater than the maximum gas supply flow, the gas mass flow can be adjusted by the solenoid valve.

[0069] The maximum gas supply flow represents the maximum gas flow input to the gas inlet of the battery stack when the battery stack is stably working. The injector can be a hydrogen jet. When the target gas mass flow is less than or equal to the maximum gas supply flow, the hydrogen consumption of the battery stack is low, and the flow can be accurately adjusted by the injector; when the target gas mass flow is greater than the maximum gas supply flow, the hydrogen consumption of the battery stack is high, and the flow can be quickly adjusted by the solenoid valve. In this way, the hydrogen jet and the solenoid valve are cooperatively applied in the fuel cell engine, the energy efficiency is effectively improved, and energy saving is realized.

[0070] In some embodiments, the gas pressure in the gas buffer device can be obtained, and the output power capacity of the fuel cell engine can be determined according to the gas pressure. When the output power capacity is greater than or equal to the vehicle demand power, the vehicle demand power can be taken as the output power of the fuel cell engine; or when the output power capacity is less than the vehicle demand power, the output power capacity can be taken as the output power of the fuel cell engine.

[0071] The output power capacity represents the output power of the fuel cell engine. The gas pressure can be obtained by a pressure measuring device such as a pressure sensor, and the output power capacity of the fuel cell engine can be determined according to the gas pressure based on an empirical formula obtained through experimental calibration.

[0072] Considering that the gas pressure in the gas buffer device and the output power capacity of the fuel cell engine are linearly related within a certain range, the empirical formula can be expressed as:

[0073] wherein, is the output power capacity of the fuel cell engine, is an empirical coefficient obtained by experiment, is the gas pressure of the fuel cell engine, is the minimum starting pressure of the cell stack of the fuel cell engine.

[0074] For example, in the case that the output power capacity is greater than or equal to the vehicle demand power , at this time the output power of the engine can meet the vehicle driving demand, the vehicle demand power may be taken as the output power of the fuel cell engine. Correspondingly, in the case that the output power capacity is less than the vehicle demand power , at this time the output power of the engine cannot meet the vehicle driving demand, the output power capacity may be taken as the output power of the fuel cell engine. In this way, the output power of the engine can be flexibly controlled according to the gas pressure of the engine, so as to avoid the pressure failure caused by the mismatch between the pressure and the output power, and improve the stability and safety of the vehicle.

[0075] Figure 2 is a flow chart of another control method of a fuel cell engine according to an example embodiment, as shown in Figure 2 , the method comprises: S201, obtaining a first gas temperature of an air inlet of a cell stack of the fuel cell engine.

[0076] For example, in the case that the ECU of the vehicle determines that the fuel cell engine starts at low temperature (such as the ambient temperature is less than 0℃), at this time the cell stack needs to perform electrochemical reaction, the first gas temperature of the air inlet of the cell stack can be obtained. The first gas temperature can be obtained by a temperature sensing device such as a temperature sensor.

[0077] S202, in the case that the first gas temperature is less than the preset temperature threshold, obtaining a gas pressure in a gas buffer device of the fuel cell engine.

[0078] The preset temperature threshold can be a lower limit value of the temperature at which the cell stack can perform electrochemical reaction when the fuel cell engine starts at low temperature, and the preset temperature threshold may be determined by experiment in advance. When the obtained first gas temperature satisfies , the hydrogen temperature at the air inlet of the cell stack is low and cannot reach the lower limit value of the temperature at which the cell stack can perform electrochemical reaction. The air inlet of the gas buffer device is connected with a gasification device of the fuel cell engine, and the gas pressure can be obtained by a pressure measuring device such as a pressure sensor.

[0079] S203, acquiring a mass of the gas entering the gas buffer device in a specified time period.

[0080] The specified time period can include a time period during which the fuel cell engine is started at a low temperature. The mass of the gas entering the gas buffer device in the specified time period can be calculated according to the following formula:

[0081] The mass of the gas entering the gas buffer device in the specified time period is The mass of the gas entering the gas buffer device in the specified time period is The mass flow rate of the gas entering the gas buffer device in the specified time period is The length of the specified time period is

[0082] S204, determining a third gas temperature of the gas inlet of the gas buffer device according to the first gas temperature, the preset temperature threshold, the gas pressure, and the mass.

[0083] The calculation formula of the third gas temperature is as follows:

[0084] The third gas temperature is The third gas temperature is The mass of the original gas in the gas buffer device is The mass of the gas entering the gas buffer device in the specified time period is The preset temperature threshold is The first gas temperature is

[0085] S205, determining a target gas mass flow rate according to the third gas temperature according to a temperature flow rate correspondence relationship.

[0086] The temperature flow rate correspondence relationship includes a correspondence relationship between a gas temperature and a gas mass flow rate at the gas inlet of the gas buffer device. The temperature flow rate correspondence relationship includes a calculation formula between the gas temperature and the gas mass flow rate. The temperature flow rate correspondence relationship can be determined in advance by the following method: acquiring a fourth gas temperature at the gas inlet of the gasification device of the fuel cell engine in a historical time period, acquiring a first liquid temperature at the liquid inlet of the gasification device, a second liquid temperature at the liquid outlet of the gasification device, and a liquid mass flow rate of the liquid in the gasification device in the historical time period, and determining the temperature flow rate correspondence relationship according to the fourth gas temperature, the first liquid temperature, the second liquid temperature, and the liquid mass flow rate.

[0087] For example, the temperature flow rate correspondence relationship is as follows:

[0088] wherein, is the gas temperature at the gas inlet of the gas buffer device, is the constant-pressure specific heat capacity of the engine circulating liquid, is the liquid mass flow rate, is the second liquid temperature, is the first liquid temperature, is the working efficiency of the gasification device, the value range of can be 0.8-0.95, is the constant-pressure specific heat capacity of the gas, is the gas mass flow rate at the gas inlet of the gas buffer device, is the fourth gas temperature.

[0089] S206, adjusting the gas mass flow rate to the target gas mass flow rate to obtain a second gas temperature at the gas inlet of the battery stack.

[0090] wherein the gas mass flow rate can be adjusted to the target gas mass flow rate by a flow adjusting device connected to the gas outlet of the gasification device and the gas inlet of the gas buffer device respectively, the flow adjusting device comprising an ejector and a solenoid valve. The gas mass flow rate at the gas inlet of the gas buffer device can be adjusted to the target gas mass flow rate by the ejector when the target gas mass flow rate is less than or equal to the maximum gas supply flow rate of the fuel cell engine; the gas mass flow rate at the gas inlet of the gas buffer device can be adjusted to the target gas mass flow rate by the solenoid valve when the target gas mass flow rate is greater than the maximum gas supply flow rate of the fuel cell engine.

[0091] S207, in the case that the second gas temperature is greater than or equal to the preset temperature threshold, controlling the fuel cell engine to start.

[0092] According to the above scheme, the first gas temperature of the air inlet of the cell stack of the fuel cell engine is acquired, and in the case that the first gas temperature is less than the preset temperature threshold, the gas pressure in the gas buffer device of the fuel cell engine is acquired, and the amount of substance of the gas entering the gas buffer device within a specified time period is acquired, and the third gas temperature of the air inlet of the gas buffer device is determined according to the first gas temperature, the preset temperature threshold, the gas pressure and the amount of substance, the target gas mass flow is determined according to the third gas temperature according to the temperature flow correspondence relationship, the gas mass flow is adjusted to the target gas mass flow, the second gas temperature of the air inlet of the cell stack is obtained, and in the case that the second gas temperature is greater than or equal to the preset temperature threshold, the fuel cell engine is controlled to start. In this way, the hydrogen flow of the air inlet of the gas buffer device of the fuel cell engine can be controlled according to the hydrogen temperature of the air inlet of the cell stack of the fuel cell engine, the hydrogen temperature entering the cell stack can be accurately controlled, the engine can be safely and stably started under different external environmental conditions, the service life of the engine is prolonged, and the stability and safety of the vehicle are improved.

[0093] It should be noted that the above Figure 2 The related description of each step in the embodiments shown in the above

[0094] Figure 3 is a block diagram of a control device 300 of a fuel cell engine according to an exemplary embodiment, the fuel cell engine comprising a cell stack and a gas buffer device, the gas outlet of the gas buffer device being connected to the air inlet of the cell stack, referring to Figure 3 The device comprises: An acquisition module 301 is configured to acquire a first gas temperature of an air inlet of a cell stack. An adjustment module 302 is configured to adjust a gas mass flow of an air inlet of a gas buffer device according to the first gas temperature and a preset temperature threshold, so as to obtain a second gas temperature of the air inlet of the cell stack. A control module 303 is configured to control a fuel cell engine to start according to the second gas temperature.

[0095] Optionally, the adjustment module 302 is configured to adjust the gas mass flow of the air inlet of the gas buffer device according to the first gas temperature and the preset temperature threshold in the case that the first gas temperature is less than the preset temperature threshold.

[0096] Optionally, the adjustment module 302 is used to determine the third gas temperature at the air inlet of the gas buffer device based on the first gas temperature and the preset temperature threshold; determine the target gas mass flow rate according to the third gas temperature according to the temperature-flow correspondence; the temperature-flow correspondence includes the correspondence between the gas temperature and the gas mass flow rate at the air inlet of the gas buffer device; and adjust the gas mass flow rate to the target gas mass flow rate.

[0097] Optionally, the regulating module 302 is used to obtain the gas pressure in the gas buffer device; obtain the amount of the substance in the gas entering the gas buffer device within a specified time period; and determine the third gas temperature based on the first gas temperature, the preset temperature threshold, the gas pressure and the amount of the substance.

[0098] Optionally, the fuel cell engine also includes a gasification device, and the gas outlet of the gasification device is connected to the gas inlet of the gas buffer device; the temperature-flow correspondence is predetermined in the following manner: the acquisition module 301 obtains the fourth gas temperature of the gas inlet of the gasification device within a historical time period; obtains the first liquid temperature of the liquid inlet of the gasification device, the second liquid temperature of the liquid outlet of the gasification device within the historical time period, and obtains the liquid mass flow rate of the liquid in the gasification device; determines the temperature-flow correspondence based on the fourth gas temperature, the first liquid temperature, the second liquid temperature and the liquid mass flow rate.

[0099] Optionally, the fuel cell engine also includes a flow regulating device, and the gas outlet of the gasification device is connected to the gas inlet of the gas buffer device through the flow regulating device, and the flow regulating device includes an injector and a solenoid valve; the regulating module 302 is used to regulate the gas mass flow through the injector when the target gas mass flow is less than or equal to the maximum gas supply flow of the fuel cell engine; or to regulate the gas mass flow through the solenoid valve when the target gas mass flow is greater than the maximum gas supply flow.

[0100] Optionally, the control module 303 is configured to control the fuel cell engine to start when the second gas temperature is greater than or equal to the preset temperature threshold.

[0101] Optionally, the control module 303 is also used to obtain the gas pressure in the gas buffer device; determine the output power capacity of the fuel cell engine based on the gas pressure; when the output power capacity is greater than or equal to the vehicle's required power, use the vehicle's required power as the output power of the fuel cell engine; or, when the output power capacity is less than the vehicle's required power, use the output power capacity as the output power of the fuel cell engine.

[0102] The above-described device can obtain a first gas temperature at the inlet of a fuel cell stack and, when the first gas temperature is less than a preset temperature threshold, obtain the gas pressure in the gas buffer device of the fuel cell engine and obtain the amount of a substance in the gas entering the gas buffer device within a specified time period. Based on the first gas temperature, the preset temperature threshold, the gas pressure, and the amount of the substance, a third gas temperature at the inlet of the gas buffer device is determined. A target gas mass flow rate is determined based on the third gas temperature according to a temperature-flow relationship, and the gas mass flow rate is adjusted to the target gas mass flow rate to obtain a second gas temperature at the inlet of the fuel cell stack. When the second gas temperature is greater than or equal to the preset temperature threshold, the fuel cell engine is controlled to start. In this way, the hydrogen flow rate at the inlet of the gas buffer device of the fuel cell engine can be controlled based on the hydrogen temperature at the inlet of the fuel cell stack, achieving precise control of the hydrogen temperature entering the fuel cell stack, enabling safe and stable engine startup under different external environmental conditions, extending the engine's service life, and improving the stability and safety of the vehicle.

[0103] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0104] Figure 4 FIG. 4 is a block diagram of an electronic device 400 according to an exemplary embodiment of the present disclosure. Figure 4 As shown, the electronic device 400 may include: a processor 401 , a memory 402 , and may further include one or more of a multimedia component 403 , an input / output (I / O) interface 404 , and a communication component 405 .

[0105] The processor 401 is configured to control overall operations of the electronic device 400 to complete all or part of the steps of the above-mentioned fuel cell engine control method. The memory 402 is configured to store various types of data to support operations of the electronic device 400, which can include, for example, instructions for any application or method operating on the electronic device 400, and application-related data, such as contact data, sent and received messages, pictures, audio, video, and the like. The memory 402 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The multimedia component 403 can include a screen and an audio component. The screen can be, for example, a touch screen, and the audio component is configured to output and / or input audio signals. For example, the audio component can include a microphone configured to receive external audio signals. The received audio signals can be further stored in the memory 402 or transmitted through the communication component 405. The audio component also includes at least one speaker configured to output audio signals. The I / O interface 404 provides an interface between the processor 401 and other interface modules, which can be a keyboard, a mouse, a button, and the like. The buttons can be virtual buttons or physical buttons. The communication component 405 is configured to perform wired or wireless communication between the electronic device 400 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, near field communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, and the like, or a combination of one or more of them, is not limited herein. Therefore, the corresponding communication component 405 can include a Wi-Fi module, a Bluetooth module, an NFC module, and the like.

[0106] In an exemplary embodiment, the electronic device 400 can be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic elements for performing the above-described control method of the fuel cell engine.

[0107] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, which, when executed by a processor, implement the steps of the above-described control method of the fuel cell engine. For example, the computer-readable storage medium can be the above-described memory 402 including program instructions, which can be executed by the processor 401 of the electronic device 400 to complete the above-described control method of the fuel cell engine.

[0108] Figure 5 is a structural block diagram of a vehicle 500 including the above-described control device 300 of the fuel cell engine according to an exemplary embodiment.

[0109] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0110] In addition, it should be noted that each specific technical feature described in the above-described specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0111] Furthermore, any combination of the various different embodiments of the present disclosure can also be made, as long as it does not deviate from the idea of the present disclosure, and it should also be considered as disclosed by the present disclosure.

Claims

1. A method for controlling a fuel cell engine, characterized in that: The fuel cell engine includes a battery stack and a gas buffer device, wherein a gas outlet of the gas buffer device is connected to a gas inlet of the battery stack, and the method includes: Acquiring a first gas temperature at an air inlet of the battery stack; adjusting the gas mass flow rate at the gas inlet of the gas buffer device according to the first gas temperature and a preset temperature threshold to obtain a second gas temperature at the gas inlet of the battery stack; The fuel cell engine is controlled to start according to the second gas temperature.

2. The method according to claim 1, characterized in that The step of adjusting the gas mass flow rate at the gas inlet of the gas buffer device according to the first gas temperature and a preset temperature threshold to obtain a second gas temperature at the gas inlet of the battery stack includes: When the first gas temperature is lower than the preset temperature threshold, the gas mass flow rate at the gas inlet of the gas buffer device is adjusted according to the first gas temperature and the preset temperature threshold.

3. The method according to claim 2, characterized in that The adjusting the gas mass flow rate of the gas inlet of the gas buffer device according to the first gas temperature and the preset temperature threshold comprises: determining a third gas temperature at the gas inlet of the gas buffer device according to the first gas temperature and the preset temperature threshold; Determining the target gas mass flow rate according to the third gas temperature in accordance with a temperature-flow correspondence relationship; the temperature-flow correspondence relationship includes a correspondence relationship between the gas temperature and the gas mass flow rate at the gas inlet of the gas buffer device; The gas mass flow rate is adjusted to the target gas mass flow rate.

4. The method according to claim 3, characterized in that Determining the third gas temperature at the gas inlet of the gas buffer device according to the first gas temperature and the preset temperature threshold includes: obtaining the gas pressure in the gas buffer device; Obtaining the amount of gas entering the gas buffer device within a specified time period; The third gas temperature is determined according to the first gas temperature, the preset temperature threshold, the gas pressure, and the amount of the substance.

5. The method according to claim 3, characterized in that The fuel cell engine further includes a gasification device, wherein the gas outlet of the gasification device is connected to the gas inlet of the gas buffer device; the temperature-flow correspondence is predetermined by: Acquire a fourth gas temperature at a gas inlet of the gasification equipment within a historical time period; Obtaining a first liquid temperature at a liquid inlet of the vaporization device, a second liquid temperature at a liquid outlet of the vaporization device, and a liquid mass flow rate of the liquid in the vaporization device within the historical time period; The temperature-flow correspondence is determined according to the fourth gas temperature, the first liquid temperature, the second liquid temperature, and the liquid mass flow rate.

6. The method according to claim 5, characterized in that The fuel cell engine further includes a flow regulating device, the gas outlet of the gasification device is connected to the gas inlet of the gas buffer device through the flow regulating device, and the flow regulating device includes an injector and a solenoid valve; The adjusting the gas mass flow rate to the target gas mass flow rate comprises: When the target gas mass flow rate is less than or equal to the maximum gas supply flow rate of the fuel cell engine, adjusting the gas mass flow rate through the injector; or, When the target gas mass flow rate is greater than the maximum gas supply flow rate, the gas mass flow rate is adjusted by the solenoid valve.

7. The method according to claim 1, characterized in that The controlling the fuel cell engine to start according to the second gas temperature includes: When the second gas temperature is greater than or equal to the preset temperature threshold, the fuel cell engine is controlled to start.

8. The method according to any one of claims 1 to 7, characterized in that The method further comprises: obtaining the gas pressure in the gas buffer device; determining the output power capacity of the fuel cell engine according to the gas pressure; In the case where the output power capacity is greater than or equal to the vehicle required power, the vehicle required power is used as the output power of the fuel cell engine; or When the output power capacity is smaller than the vehicle required power, the output power capacity is used as the output power of the fuel cell engine.

9. A control device for a fuel cell engine, characterized in that: The fuel cell engine includes a battery stack and a gas buffer device, wherein the gas outlet of the gas buffer device is connected to the gas inlet of the battery stack, and the device includes: an acquisition module, configured to acquire a first gas temperature at an air inlet of the battery stack; a regulating module, configured to regulate the gas mass flow rate at the gas inlet of the gas buffer device according to the first gas temperature and a preset temperature threshold, so as to obtain a second gas temperature at the gas inlet of the battery stack; A control module is used to control the fuel cell engine to start according to the second gas temperature.

10. A vehicle, characterized in that: A control device comprising the fuel cell engine according to claim 9.

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