Heating method and device of hydrogen circulating pump, fuel cell system and vehicle

Abstract

The invention provides a heating method and device of a hydrogen circulating pump, a fuel cell system and a vehicle, the method is applied to the technical field of fuel cells, and the method comprises the following steps: when the current rotating speed of the hydrogen circulating pump is smaller than a preset rotating speed and a first duration when the current rotating speed is smaller than the preset rotating speed is longer than a preset duration; determining the shortest total deicing time according to the temperature interval of the current environment temperature, determining the optimal hydrogen pressure interval according to the shortest total deicing time, determining the target heating temperature and the target valve opening and closing frequency according to the current environment temperature, the optimal hydrogen pressure interval and the shortest total deicing time, and heating the cooling liquid according to the temperature. And after the temperature of the cooling liquid reaches the target heating temperature, the valve frequency is adjusted according to the target valve opening and closing frequency till the current rotating speed of the hydrogen circulating pump is larger than or equal to the preset rotating speed. According to the method, the problem that the hydrogen circulating pump is frozen after cold start of the fuel cell system can be effectively avoided, so that the system can be normally started in a low-temperature environment.

Description

Technical Field

[0001] The present application relates to the field of fuel cells, and more specifically, to a heating method and device for a hydrogen circulation pump in the field of fuel cells, a fuel cell system and a vehicle. Background Art

[0002] When the fuel cell system is cold-started at low temperatures, the hydrogen circulation pump may freeze and fail to start, which may cause system failure or even require repairs, leading to customer complaints.

[0003] In the related art, in order to solve the problem of hydrogen circulation pump freezing in low temperature environment, a low-frequency and high-current method is used to increase the torque to achieve the purpose of defrosting.

[0004] However, the current value required to break the ice for the hydrogen circulation pump is difficult to control. If the current is too large, it may cause damage to the circuit board. If the current is too small, the hydrogen circulation pump may not be started normally in a low temperature environment. Therefore, this solution has poor stability and poses safety hazards. Summary of the invention

[0005] The present application provides a heating method and device for a hydrogen circulation pump, a fuel cell system and a vehicle. The method can solve the problem of hydrogen circulation pump freezing after the fuel cell system is cold started, so that the system can start normally in a low temperature environment.

[0006] In a first aspect, a method for heating a hydrogen circulation pump is provided, the method comprising:

[0007] The current speed and current ambient temperature of the hydrogen circulation pump are obtained; if the current speed is less than a preset speed and the first duration during which the current speed is less than the preset speed is greater than a preset duration, the shortest total ice-melting time is determined according to the temperature interval in which the current ambient temperature is located, and the optimal hydrogen pressure interval is determined according to the shortest total ice-melting time, and the target heating temperature and the target valve opening and closing frequency are determined according to the current ambient temperature, the optimal hydrogen pressure interval and the shortest total ice-melting time; the coolant is heated according to the target heating temperature, and after the coolant temperature reaches the target heating temperature, the valve frequency is adjusted according to the target valve opening and closing frequency until the current speed of the hydrogen circulation pump is greater than or equal to the preset speed.

[0008] Through the above technical solution, the present application determines whether the current speed and duration of the hydrogen circulation pump are within the normal range. When the speed is less than the calibrated value and the duration is greater than a certain amount, the shortest total deicing time is determined according to the current ambient temperature, and then the valve opening and closing frequency that makes the deicing time of the hydrogen circulation pump the shortest is determined to achieve low-temperature start of the fuel cell system. Therefore, the present application effectively avoids the problem of hydrogen circulation pump freezing after the cold start of the fuel cell system, combines the current ambient temperature and hydrogen pressure of the fuel cell system, matches the appropriate deicing strategy, and enables the system to start normally in a low-temperature environment.

[0009] In combination with the first aspect, in some possible implementations, determining the optimal hydrogen pressure interval based on the shortest total ice-melting time includes: matching at least one target hydrogen pressure interval based on the shortest total ice-melting time, wherein there is no intersection between the at least one target hydrogen pressure interval; determining the minimum hydrogen pressure in the at least one target hydrogen pressure interval, and using the target hydrogen pressure interval corresponding to the minimum hydrogen pressure as the optimal hydrogen pressure interval.

[0010] Through the above technical solution, after obtaining the current ambient temperature, the present application matches the ambient temperature range. In the temperature range where the current ambient temperature is located, the system can automatically determine the shortest total ice-melting time. Based on this, the present application obtains multiple hydrogen pressure ranges. Therefore, the present application obtains the optimal hydrogen pressure range by selecting the minimum hydrogen pressure.

[0011] In combination with the first aspect, in some possible implementations, the shortest total deicing time is the sum of a first time for heating the coolant to the target heating temperature at the current ambient temperature and a second time for defrosting by adjusting the valve frequency according to the target valve opening and closing frequency based on the optimal pressure hydrogen interval, and determining the target heating temperature and the target valve opening and closing frequency according to the current ambient temperature, the optimal hydrogen pressure interval and the shortest total deicing time includes:

[0012] Based on the current ambient temperature, determining a first target calibration table from a plurality of preset heating time calibration tables, and determining the target heating temperature according to the first time and the first target calibration table, wherein the first target calibration table includes a plurality of heating temperatures and a heating time for heating the coolant to each heating temperature;

[0013] Based on the optimal hydrogen pressure range and the target heating temperature, a second target calibration table is determined from a plurality of preset defrosting time calibration tables, and the target valve opening and closing frequency is obtained according to the second time and the second target calibration table, wherein the second target calibration table includes a plurality of groups of valve opening and closing frequencies and the hydrogen circulation pump defrosting time corresponding to each group of valve opening and closing frequencies.

[0014] Through the above technical solution, the present application provides multiple heating time calibration tables for matching the target calibration table according to the current ambient temperature. Since the calibration table includes the heating target temperature and its corresponding hydrogen circulation pump defrosting time, the present application can obtain the appropriate target heating temperature according to the calibration table. The present application provides multiple defrosting time calibration tables for obtaining the valve opening and closing frequency and its corresponding hydrogen circulation pump defrosting time according to the optimal hydrogen pressure range and the target heating temperature.

[0015] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, before determining the first target calibration table from the preset multiple heating time calibration tables based on the current ambient temperature, it also includes: determining multiple ambient temperature intervals to be calibrated and multiple heating temperatures; based on each ambient temperature interval to be calibrated, recording the heating time for heating the coolant to each heating temperature; and obtaining the preset multiple heating time calibration tables according to the multiple ambient temperature intervals to be calibrated, the multiple heating temperatures and the heating time for heating the coolant to each heating temperature.

[0016] Through the above technical solution, the present application calibrates the target heating temperature of the heater under different ambient temperatures, and selects the heating target temperature with the shortest defrosting time of the hydrogen circulation pump at each temperature. Thus, the present application can obtain multiple heating time calibration tables to match the appropriate heating temperature according to different ambient temperatures.

[0017] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, before determining the second target calibration table from the preset multiple defrosting time calibration tables based on the optimal hydrogen pressure interval and the target heating temperature, it also includes: determining multiple hydrogen pressure intervals; under each of the ambient temperature intervals to be calibrated, based on each heating temperature, recording the hydrogen circulation pump defrosting time corresponding to each group of valve opening and closing frequencies under each hydrogen pressure interval; obtaining the preset multiple defrosting time calibration tables according to the multiple heating temperatures, the multiple hydrogen pressure intervals, the multiple groups of valve opening and closing frequencies and the hydrogen circulation pump defrosting time corresponding to each group of valve opening and closing frequencies under the multiple groups of valve opening and closing frequencies.

[0018] Through the above technical scheme, the present application obtains, according to the current ambient temperature and based on each heating temperature, multiple sets of valve opening and closing frequencies and their corresponding hydrogen circulation pump defrosting time in each hydrogen pressure range through experiments. Therefore, the present application can obtain suitable valve opening and closing frequencies of the drain valve and the nitrogen exhaust valve by matching the hydrogen pressure range, and the hydrogen circulation pump defrosting time at this valve opening and closing frequency is the shortest.

[0019] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, when adjusting the valve frequency according to the target valve opening and closing frequency, it also includes: based on a preset instruction sending cycle, sending a rotation instruction to the hydrogen circulation pump; obtaining the real-time speed of the hydrogen circulation pump, if the real-time speed is less than the preset speed and the second continuous time length that the real-time speed is less than the preset speed is greater than the preset time length, then continuously adjusting the valve frequency according to the target valve opening and closing frequency.

[0020] Through the above technical solution, after heating the coolant, the present application detects the speed and duration again. If the speed does not meet the requirements for the operation of the fuel cell system, the valve frequency continues to be adjusted according to the target valve opening and closing frequency until it reaches the standard for normal operation of the system, and the operation of adjusting the valve frequency is ended. In this way, the problem of freezing of the hydrogen circulation pump is effectively solved, so that the system can start normally in a low temperature environment.

[0021] In combination with the first aspect and the above-mentioned implementation methods, in some possible implementation methods, after adjusting the valve frequency according to the target valve opening and closing frequency, it also includes: obtaining the total time used for the current defrosting; if the total time used for the current defrosting is greater than the shortest total defrosting time, sending an optical reminder message and / or an acoustic reminder message to a preset mobile terminal.

[0022] Through the above technical solution, after adjusting the frequency of the valve, the present application counts the current defrosting time. When the time is greater than a certain amount, it is determined that the hydrogen circulation pump heating strategy has a fault, thereby providing feedback to the user, troubleshooting the fault in a timely manner, and ensuring the safety of the fuel cell system.

[0023] In a second aspect, a heating device for a hydrogen circulation pump is provided, the device comprising:

[0024] an acquisition module for acquiring a current rotational speed and a current ambient temperature of a hydrogen circulation pump; a determination module for determining a minimum total ice-melting time according to a temperature interval in which the current ambient temperature is located, when the current rotational speed is less than a preset rotational speed and a first duration during which the current rotational speed is less than the preset rotational speed is greater than a preset duration, and determining an optimal hydrogen pressure interval according to the shortest total ice-melting time, and determining a target heating temperature and a target valve opening and closing frequency according to the current ambient temperature, the optimal hydrogen pressure interval and the shortest total ice-melting time; and a heating module for heating a coolant according to the target heating temperature, and after the coolant temperature reaches the target heating temperature, adjusting the valve frequency according to the target valve opening and closing frequency until the current rotational speed of the hydrogen circulation pump is greater than or equal to the preset rotational speed.

[0025] In conjunction with the second aspect, in some possible implementations, the determining module includes:

[0026] a matching unit, used to match at least one target hydrogen pressure interval according to the shortest total ice-melting time, wherein there is no intersection between the at least one target hydrogen pressure interval; a first determination unit, used to determine the minimum hydrogen pressure in the at least one target hydrogen pressure interval, and use the target hydrogen pressure interval corresponding to the minimum hydrogen pressure as the optimal hydrogen pressure interval.

[0027] In combination with the second aspect and the above implementations, in some possible implementations, the shortest total ice-melting time is the sum of a first time for heating the coolant to the target heating temperature at the current ambient temperature and a second time for melting by adjusting the valve frequency according to the target valve opening and closing frequency based on the optimal pressure hydrogen interval, and the determination module further includes:

[0028] a second determining unit, configured to determine a first target calibration table from a plurality of preset heating time calibration tables based on the current ambient temperature, and determine the target heating temperature according to the first time and the first target calibration table, wherein the first target calibration table includes a plurality of heating temperatures and a heating time for heating the coolant to each heating temperature;

[0029] a third determination unit, for determining a second target calibration table from a plurality of preset defrosting time calibration tables based on the optimal hydrogen pressure range and the target heating temperature, and obtaining the target valve opening and closing frequency according to the second time and the second target calibration table, wherein the second target calibration table includes a plurality of groups of valve opening and closing frequencies and a hydrogen circulation pump defrosting time corresponding to each group of valve opening and closing frequencies.

[0030] In combination with the second aspect and the foregoing implementation manner, in some possible implementation manners, before determining the first target calibration table from the preset multiple heating time calibration tables based on the current ambient temperature, the second determination unit is specifically configured to:

[0031] Determine a plurality of ambient temperature intervals to be calibrated and a plurality of heating temperatures; based on each ambient temperature interval to be calibrated, record the heating time for heating the coolant to each heating temperature; obtain the plurality of preset heating time calibration tables according to the plurality of ambient temperature intervals to be calibrated, the plurality of heating temperatures and the heating time for heating the coolant to each heating temperature.

[0032] In combination with the second aspect and the above implementation, in some possible implementations, before determining the second target calibration table from a plurality of preset defrosting time calibration tables based on the optimal hydrogen pressure range and the target heating temperature, the third determining unit is further used to:

[0033] Determine a plurality of hydrogen pressure intervals; under each of the ambient temperature intervals to be calibrated, based on the each heating temperature, record the defrosting time of the hydrogen circulation pump corresponding to each group of valve opening and closing frequencies under each hydrogen pressure interval; obtain the plurality of preset defrosting time calibration tables according to the plurality of heating temperatures, the plurality of hydrogen pressure intervals, the plurality of groups of valve opening and closing frequencies and the defrosting time of the hydrogen circulation pump corresponding to each group of valve opening and closing frequencies under the plurality of groups of valve opening and closing frequencies.

[0034] In combination with the second aspect and the above implementations, in some possible implementations, when the valve frequency is adjusted according to the target valve opening and closing frequency, the heating module further includes:

[0035] The first sending unit is used to send a rotation instruction to the hydrogen circulation pump based on a preset instruction sending cycle; the judgment unit is used to obtain the real-time rotation speed of the hydrogen circulation pump, if the real-time rotation speed is less than the preset rotation speed and the second continuous time length that the real-time rotation speed is less than the preset rotation speed is greater than the preset time length, then the valve frequency is continuously adjusted according to the target valve opening and closing frequency.

[0036] In combination with the second aspect and the above-mentioned implementation methods, in some possible implementation methods, after adjusting the valve frequency according to the target valve opening and closing frequency, the heating module also includes: a second acquisition unit, used to obtain the total time currently used for defrosting; a second sending unit, used to send optical reminder information and / or acoustic reminder information to a preset mobile terminal when the total time currently used for defrosting is greater than the shortest total defrosting time.

[0037] In a third aspect, a fuel cell system is provided, comprising the heating device for the hydrogen circulation pump as described above.

[0038] In a fourth aspect, a vehicle is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the heating method of the hydrogen circulation pump as described in the above embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the principle of a solution provided by an embodiment of the present application;

[0040] Figure 2 is a flow chart of a heating method for a hydrogen circulation pump provided in an embodiment of the present application;

[0041] Figure 3 is a schematic diagram of a heating device for a hydrogen circulation pump provided in an embodiment of the present application;

[0042] Figure 4 It is a schematic diagram of the structure of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The technical solution in the present application will be described clearly and in detail below in conjunction with the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0044] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0045] Those skilled in the art will understand that low-temperature starting performance is a very important indicator for a fuel cell system. Due to the limitations of system architecture and product performance, the hydrogen circulation pump may freeze and fail to start when the system is cold-started under low-temperature conditions.

[0046] Therefore, in view of the above-mentioned problem, the present application proposes a heating method for a hydrogen circulation pump. The method involves an icing heating strategy for a hydrogen circulation pump during cold start of a fuel cell. When icing occurs in the hydrogen circulation pump during the cold start process, a hydrogen plate exchange heating strategy is adopted. After heating, the hydrogen circulation pump breaks the ice, and the system operates normally without causing degradation of the fuel cell stack performance.

[0047] Before explaining the heating method of the hydrogen circulation pump provided in the embodiment of the present application, the principle of the scheme involved in the embodiment of the present application is first explained.

[0048] Figure 1 This is a schematic diagram of the principle of a solution of an embodiment of the present application, such as Figure 1 As shown, the heating method of the hydrogen circulation pump of the present application involves the following components: a fuel cell stack 1, an electric heater 2, a cooling water pump 3, a gas-liquid separator 4, a hydrogen circulation pump 5, a drain valve 6, a nitrogen exhaust valve 7, and a heat exchanger 8.

[0049] Among them, the hydrogen circulation pump 5 is used to circulate hydrogen, the drain valve 6 is used to drain water, the nitrogen exhaust valve 7 is used to drain nitrogen and water, the cooling water pump 3 is used to circulate coolant to cool the fuel cell stack, the electric heater 2 is used to heat the coolant, the heat exchanger 8 is used to exchange heat for hydrogen, and the gas-liquid separator 4 is used to separate water vapor.

[0050] The present application heats the coolant by PTC (Parametric Technology Corporation, electric heater), that is, the electric heater 2, and uses the heat inside the coolant to heat the low-temperature hydrogen into high-temperature hydrogen when using the heat exchanger 8. The high-temperature hydrogen is circulated in the hydrogen circulation loop to increase the temperature of the hydrogen circulation loop. After reaching the ice melting temperature of the hydrogen circulation pump 5, the cold start is successful. The following examples are listed in combination with the accompanying drawings to describe in detail the heating method of the hydrogen circulation pump of the present application.

[0051] Figure 2 This is a flow chart of a heating method for a hydrogen circulation pump provided in an embodiment of the present application.

[0052] For example, Figure 2 As shown, the method comprises the following steps:

[0053] In step S201, the current rotation speed of the hydrogen circulation pump and the current ambient temperature are obtained.

[0054] Among them, the current rotation speed of the hydrogen circulation pump and the current ambient temperature can be obtained through corresponding sensors respectively.

[0055] It is understandable that if the speed of the hydrogen circulation pump cannot reach the set value within a certain period of time, it is determined that the hydrogen circulation pump is frozen. Therefore, the embodiment of the present application needs to obtain the current speed of the hydrogen circulation pump and the duration of the current speed being less than the preset speed, thereby determining whether the hydrogen circulation pump needs to be heated. Furthermore, by obtaining the current ambient temperature, the heating temperature of the hydrogen circulation pump is determined, and the fuel cell system is adjusted according to the current hydrogen pressure of the hydrogen circulation pump so that it can start normally in a low temperature environment.

[0056] In step S202, if the current speed is less than the preset speed and the first duration of the current speed being less than the preset speed is greater than the preset duration, the shortest total ice-melting time is determined according to the temperature range of the current ambient temperature, and the optimal hydrogen pressure range is determined according to the shortest total ice-melting time, and the target heating temperature and the target valve opening and closing frequency are determined according to the current ambient temperature, the optimal hydrogen pressure range and the shortest total ice-melting time.

[0057] It should be noted that, after obtaining the current speed, the fuel cell system of the embodiment of the present application needs to compare the current speed with the preset speed, and compare the duration that the current speed is less than the preset speed with the preset duration. When the current speed is less than the preset speed and the duration that the current speed is less than the preset speed is greater than the preset duration, that is, when the speed is too small and the process lasts too long, it is determined that the hydrogen circulation pump is frozen at this time. Then, the present application determines the shortest total de-icing time according to the current ambient temperature obtained in step S201 and the calibrated temperature range, and determines the target heating temperature and the target valve opening and closing frequency in combination with the current ambient temperature and the determined optimal pressure range of the hydrogen circulation pump. Thus, the coolant is heated according to the determined heating temperature, and the valve is adjusted according to the determined valve opening and closing frequency, so that the hydrogen circulation pump breaks the ice, and the de-icing time is shortest, which greatly improves the timeliness and safety of the cold start of the hydrogen circulation pump.

[0058] Specifically, before the cold start, the FCU (Fuel-cell Control Unit) sends a startup command to the hydrogen circulation pump, and the system receives the hydrogen circulation pump feedback speed. When the hydrogen circulation pump speed cannot reach the set value within 5s (calibrated quantity), the hydrogen circulation pump is judged to be frozen, and the corresponding de-icing strategy is started synchronously. In addition, this application does not specifically limit the duration of the current speed reaching the set value, and those skilled in the art can set it according to actual conditions.

[0059] The following examples will specifically introduce the hydrogen circulation pump heating strategy of the present application.

[0060] In an embodiment of the present application, the total defrosting time may be the sum of the time required to heat the coolant to a certain heating temperature at a certain ambient temperature and the time required to defrost by adjusting the valve frequency according to a certain valve opening and closing frequency based on a certain hydrogen pressure range, that is, the shortest total defrosting time is the sum of the first time required to heat the coolant to the target heating temperature at the current ambient temperature and the second time required to defrost by adjusting the valve frequency according to the target valve opening and closing frequency based on the optimal hydrogen pressure range.

[0061] It should be noted that, in this embodiment, the target heating temperature of the coolant is to heat the coolant to a heating temperature within a normal range based on the current ambient temperature when the hydrogen circulation pump is frozen. The target valve opening and closing frequency is to adjust the calibration value of the valve after the coolant reaches the normal temperature range, and its function is to make the speed of the hydrogen circulation pump reach the start-up standard.

[0062] Optionally, in some embodiments, determining the optimal hydrogen pressure interval based on the shortest total ice-melting time includes: matching at least one target hydrogen pressure interval based on the shortest total ice-melting time, wherein there is no intersection between at least one target hydrogen pressure interval; determining the minimum hydrogen pressure in at least one target hydrogen pressure interval, and taking the target hydrogen pressure interval corresponding to the minimum hydrogen pressure as the optimal hydrogen pressure interval.

[0063] It is understandable that in step S201, the present application can obtain the current ambient temperature through the temperature sensor, and the current ambient temperature value matches the temperature range set by the present application, so that the vehicle system automatically obtains the shortest ice-melting time through the temperature range where the current ambient temperature is located. For example, if the current ambient temperature is -10°C, and the temperature value T is in the temperature range -10≤T<0°C, the vehicle system automatically obtains through relevant calculations that at this ambient temperature, the shortest total ice-melting time required to start the hydrogen circulation pump is 10 minutes.

[0064] Furthermore, through the shortest total ice-melting time, the present application can match one or more hydrogen pressure intervals. Since the present application needs to determine a unique target hydrogen pressure interval, that is, the optimal hydrogen pressure interval, the present application compares the hydrogen pressures in multiple target hydrogen pressure intervals and takes the hydrogen pressure interval with the minimum hydrogen pressure as the optimal hydrogen pressure interval.

[0065] For example, when the current ambient temperature is -10°C, the total shortest defrosting time obtained by the temperature range under this temperature value is 10 minutes, and the target hydrogen pressure range corresponding to 10 minutes is 120≤P<140Kpa and 140≤P<160Kpa. At this time, the minimum hydrogen pressure P is 120Kpa. Therefore, in this embodiment, the optimal hydrogen pressure range is 120≤P<140Kpa.

[0066] Optionally, in some embodiments, the target heating temperature and the target valve opening and closing frequency are determined according to the current ambient temperature, the optimal hydrogen pressure range and the shortest total defrosting time, including: based on the current ambient temperature, determining a first target calibration table from a plurality of preset heating time calibration tables, and determining the target heating temperature according to the first time and the first target calibration table, wherein the first target calibration table includes a plurality of heating temperatures and a heating time for heating the coolant to each heating temperature; based on the optimal hydrogen pressure range and the target heating temperature, determining a second target calibration table from a plurality of preset defrosting time calibration tables, and obtaining the target valve opening and closing frequency according to the second time and the second target calibration table, wherein the second target calibration table includes a plurality of groups of valve opening and closing frequencies and a hydrogen circulation pump defrosting time corresponding to each group of valve opening and closing frequencies.

[0067] It should be noted that the present application fully considers the impact of the current ambient temperature on the temperature of the hydrogen circulation pump. Therefore, the present application provides multiple heating time calibration tables, which are used to match the temperature range of the current ambient temperature obtained in step S201 to obtain a more reasonable PTC heating target temperature table, that is, the first target calibration table in the embodiment of the present application. Therefore, the present application can heat the coolant to the preset temperature based on the time corresponding to each heating temperature, and use the heating temperature that heats the coolant to the preset temperature in the shortest time as the target heating temperature.

[0068] Optionally, the present application also provides multiple defrosting time calibration tables. Based on the above embodiments, the present application can obtain the optimal hydrogen pressure range and the target heating temperature. Therefore, combined with this data, the present application can determine the calibration table for adjusting the valve frequency in multiple defrosting time calibration tables, that is, the second target calibration table in the embodiment of the present application, and then, according to the second time, the target valve opening and closing frequency and its corresponding hydrogen circulation pump defrosting time are matched in the second target calibration table.

[0069] Therefore, the present application fully considers the current ambient temperature and obtains a heating temperature that heats the coolant to a normal temperature range with the shortest heating time; based on the optimal hydrogen pressure range and the target heating temperature, the target valve opening and closing frequency is obtained from the second target calibration table, and then the valve of the hydrogen circulation pump is adjusted according to the target valve opening and closing frequency.

[0070] Optionally, in some embodiments, before determining the first target calibration table from a plurality of preset heating time calibration tables based on the current ambient temperature, it also includes: determining a plurality of ambient temperature intervals to be calibrated and a plurality of heating temperatures; based on each ambient temperature interval to be calibrated, recording the heating time for heating the coolant to each heating temperature; and obtaining a plurality of preset heating time calibration tables according to the plurality of ambient temperature intervals to be calibrated, the plurality of heating temperatures and the heating time for heating the coolant to each heating temperature.

[0071] It should be noted that the present application first needs to calibrate multiple ambient temperature intervals to be calibrated, and according to each ambient temperature interval, calculate the coolant heating temperature required in the temperature interval, so as to obtain each temperature interval and its corresponding multiple heating temperatures.

[0072] Furthermore, based on each ambient temperature interval to be calibrated, the present application records the heating time for heating the coolant to the heating temperature under the current temperature environment through a limited number of experiments. Thus, the present application obtains multiple heating time calibration tables, which include multiple ambient temperature intervals to be calibrated, multiple heating temperatures, and the heating time for heating the coolant to each heating temperature.

[0073] In some embodiments, the coolant is heated using a PTC heater in the system to heat the coolant to above 60°C (calibrated amount). In this embodiment, the target temperature of PTC heating needs to be calibrated according to the ambient temperature. The calibration principle of this application, that is, the multiple heating time calibration tables in the embodiments of this application are as follows, where Table 1 is a heating time calibration table when the ambient temperature T is -30≤T<-20°C, Table 2 is a heating time calibration table when the ambient temperature T is -20≤T<-10°C, and Table 3 is a heating time calibration table when the ambient temperature T is -10≤T<0°C.

[0074] Table 1

[0075]

[0076] Table 2

[0077]

[0078] Table 3

[0079]

[0080] Therefore, the present application can match a suitable heating time calibration table according to the current ambient temperature. Since the target temperature calibration table includes multiple PTC heating target temperatures and the time for each heating temperature to heat the coolant to the preset temperature, the present application can use the heating temperature with the shortest time as the target heating temperature based on the time for each heating temperature to heat the coolant to the preset temperature, so as to achieve the effect of shortening the heating time.

[0081] It should be noted that in addition to heating the coolant according to the target heating temperature, the present application needs to calibrate different hydrogen inlet pressures. Taking into account that different opening and closing frequencies have different effects on the cold start of the fuel cell stack, the present application provides multiple defrosting time calibration tables to match the current hydrogen pressure value.

[0082] Optionally, in some embodiments, before determining the second target calibration table from a plurality of preset defrosting time calibration tables based on the optimal hydrogen pressure interval and the target heating temperature, it also includes: determining a plurality of hydrogen pressure intervals; in each ambient temperature interval to be calibrated, based on each heating temperature, recording the defrosting time of the hydrogen circulation pump corresponding to each group of valve opening and closing frequencies in each hydrogen pressure interval; obtaining a plurality of preset defrosting time calibration tables according to the defrosting time of the hydrogen circulation pump corresponding to each group of valve opening and closing frequencies under a plurality of heating temperatures, a plurality of hydrogen pressure intervals, a plurality of groups of valve opening and closing frequencies, and a plurality of groups of valve opening and closing frequencies.

[0083] Based on the above embodiments, the present application determines multiple hydrogen pressure intervals and multiple heating temperatures in each ambient temperature interval to be calibrated. In each hydrogen pressure interval, the present application records the hydrogen circulation pump defrosting time corresponding to each group of valve opening and closing frequencies through a limited number of experiments, thereby obtaining multiple defrosting time calibration tables, which include multiple hydrogen pressure intervals, multiple groups of valve opening and closing frequencies, and the hydrogen circulation pump defrosting time corresponding to each group of valve opening and closing frequencies under multiple groups of valve opening and closing frequencies.

[0084] It should be noted that if Figure 1 As shown, the embodiment of the present application can obtain the current hydrogen pressure range through the pressure sensor. At the same time, the opening frequency of the drain valve 6 and the nitrogen exhaust valve 7 needs to be calibrated, and the hydrogen pressure and the drain valve 6 and the nitrogen exhaust valve 7 calibration mainly calibrate the hydrogen circulation pump defrosting time and reduce the hydrogen consumption.

[0085] Specifically, since the multiple defrosting time calibration tables of the embodiments of the present application contain multiple groups of valve opening and closing frequencies and the hydrogen circulation pump defrosting time corresponding to each group of valve opening and closing frequencies, the target defrosting time calibration table can be obtained according to the optimal hydrogen pressure range obtained by matching, thereby obtaining the target valve opening and closing frequency, and then, the drain valve and the nitrogen exhaust valve are controlled until the current speed obtained is not less than the preset speed.

[0086] It should be noted that this application needs to calibrate the cold start effect of the fuel cell stack under different hydrogen inlet pressures and different valve opening and closing frequencies. The shortest defrosting time indicates that the hydrogen pressure and valve frequency at this point meet the requirements. Ultimately, the operating condition with the lowest hydrogen pressure and the shortest valve opening and closing frequency is selected as the optimal operating condition.

[0087] Specifically, the principles of the multiple ice-melting time calibration tables of the present application are as follows: Table 4 is a ice-melting time calibration table when the hydrogen pressure value P is 120 kpa, Table 5 is a ice-melting time calibration table when the hydrogen pressure value P is 140 kpa, and Table 6 is a ice-melting time calibration table when the hydrogen pressure value P is 160 kpa.

[0088] Table 4

[0089]

[0090] Table 5

[0091]

[0092] Table 6

[0093]

[0094] Preferably, when calibrating different hydrogen inlet pressures and multiple valve opening and closing frequencies and their corresponding defrosting times, the application controls the pressure of the injected hydrogen at 160Kpa as the optimal working condition.

[0095] Therefore, the present application matches multiple defrosting time calibration tables based on the optimal hydrogen pressure range and the target heating temperature, determines the target valve opening and closing frequency based on the hydrogen circulation pump defrosting time corresponding to each group of valve opening and closing frequencies, and combines the optimal hydrogen pressure range and the shortest total defrosting time, so that the present application can control the drain valve and the nitrogen exhaust valve according to the target valve opening and closing frequency.

[0096] In step S203, the coolant is heated according to the target heating temperature, and after the coolant temperature reaches the target heating temperature, the valve frequency is adjusted according to the target valve opening and closing frequency until the current speed of the hydrogen circulation pump is greater than or equal to the preset speed.

[0097] Specifically, through step S202, the present application can obtain the target heating temperature and target valve opening and closing frequency for adjusting the hydrogen circulation pump based on the current ambient temperature. Therefore, after heating the coolant according to the target heating temperature, the present application provides hydrogen to the fuel cell system based on the minimum hydrogen pressure in the optimal hydrogen pressure range, and adjusts the valve frequency according to the target valve opening and closing frequency, so that the hydrogen circulation pump breaks the ice, and the fuel cell system can start normally in a low temperature environment.

[0098] Optionally, in some embodiments, when adjusting the valve frequency according to the target valve opening and closing frequency, it also includes: sending a rotation instruction to the hydrogen circulation pump based on a preset instruction sending cycle; obtaining the real-time speed of the hydrogen circulation pump, if the real-time speed is less than the preset speed and the second duration that the real-time speed is less than the preset speed is greater than the preset duration, then continuously adjusting the valve frequency according to the target valve opening and closing frequency.

[0099] It can be understood that the operating conditions of the hydrogen circulation pump can only be met when the speed of the hydrogen circulation pump is greater than or equal to the calibration amount. Therefore, when the valve frequency is adjusted according to the target valve opening and closing frequency, the real-time speed of the hydrogen circulation pump is monitored. When the real-time speed is less than the preset speed and the duration of the real-time speed being less than the preset speed is greater than the preset time, it is determined that the temperature of the hydrogen circulation pump at this time still does not meet the standard, so the valve is continuously adjusted according to the target valve opening and closing frequency, otherwise, the operation of adjusting the valve frequency is stopped.

[0100] Specifically, during the defrosting process, rotation instructions are sent to the hydrogen circulation pump at certain intervals to detect whether the hydrogen circulation pump has broken the ice and returned to normal: if the hydrogen circulation pump cannot operate normally, the defrosting steps are repeated; if the hydrogen circulation pump resumes operation, the FCU sends an instruction to the system to jump to normal operating status, and the system starts successfully.

[0101] In addition, the present application has obtained through limited experiments that the period of sending the rotation instruction is once every 10 seconds. Therefore, those skilled in the art can perform heating control of the hydrogen circulation pump according to the preferred calibration amount.

[0102] Optionally, in some embodiments, after adjusting the valve frequency according to the target valve opening and closing frequency, it also includes: obtaining the current total time used for defrosting; if the current total time used for defrosting is greater than the shortest total defrosting time, sending optical reminder information and / or acoustic reminder information to a preset mobile terminal.

[0103] It is understandable that if the ice-melting time is too long and the hydrogen circulation pump still does not reach the starting temperature, it is determined that the hydrogen circulation pump is faulty at this time. In order to timely feedback the working status of the hydrogen circulation pump to the user, the fuel cell system of the present application generates optical reminder information or acoustic reminder information or optical reminder information and acoustic reminder information when the current total ice-melting time is greater than the shortest total ice-melting time, and sends the reminder information to the preset mobile terminal to remind the user that the heating function of the hydrogen circulation pump is faulty, thereby further ensuring the safety of the fuel cell system by troubleshooting. In addition, the preset mobile terminal in this embodiment can be a smart phone, the optical reminder information can be a push message sent by the system to the mobile terminal, and the acoustic reminder information can be a whistle sent by the fuel cell system to the mobile terminal, which is not specifically limited here.

[0104] In summary, the heating method of the hydrogen circulation pump of the present application, when the current speed of the hydrogen circulation pump is less than the preset speed and the first continuous time of the current speed being less than the preset speed is greater than the preset time, determines the shortest total ice-melting time according to the temperature range of the current ambient temperature, determines the optimal hydrogen pressure range according to the shortest total ice-melting time, and determines the target heating temperature and the target valve opening and closing frequency according to the current ambient temperature, the optimal hydrogen pressure range and the shortest total ice-melting time, heats the coolant according to the temperature, and after the coolant temperature reaches the target heating temperature, adjusts the valve frequency according to the target valve opening and closing frequency until the current speed of the hydrogen circulation pump is greater than or equal to the preset speed. This method can solve the problem of hydrogen circulation pump freezing after the cold start of the fuel cell system, so that the system can start normally in a low temperature environment, and will not cause the problem of fuel cell performance degradation.

[0105] Figure 3 It is a structural schematic diagram of a heating device for a hydrogen circulation pump provided in an embodiment of the present application.

[0106] For example, Figure 3 As shown, the heating device 10 of the hydrogen circulation pump may include an acquisition module 100 , a determination module 200 and a heating module 300 .

[0107] Among them, the acquisition module 100 is used to obtain the current speed and current ambient temperature of the hydrogen circulation pump; the determination module 200 is used to determine the shortest total ice-melting time according to the temperature range of the current ambient temperature when the current speed is less than the preset speed and the first continuous time that the current speed is less than the preset speed is greater than the preset time, and determine the optimal hydrogen pressure range according to the shortest total ice-melting time, and determine the target heating temperature and the target valve opening and closing frequency according to the current ambient temperature, the optimal hydrogen pressure range and the shortest total ice-melting time; and the heating module 300 is used to heat the coolant according to the target heating temperature, and after the coolant temperature reaches the target heating temperature, adjust the valve frequency according to the target valve opening and closing frequency until the current speed of the hydrogen circulation pump is greater than or equal to the preset speed.

[0108] Optionally, in some embodiments, the determination module 200 includes: a matching unit and a first determination unit.

[0109] Among them, the matching unit is used to match at least one target hydrogen pressure interval according to the shortest total ice melting time, wherein there is no intersection between at least one target hydrogen pressure interval; the first determination unit is used to determine the minimum hydrogen pressure in at least one target hydrogen pressure interval, and use the target hydrogen pressure interval corresponding to the minimum hydrogen pressure as the optimal hydrogen pressure interval.

[0110] Optionally, in some embodiments, the shortest total defrosting time is the sum of a first time for heating the coolant to a target heating temperature under the current ambient temperature and a second time for defrosting by adjusting the valve frequency according to a target valve opening and closing frequency based on an optimal pressure hydrogen interval. The determination module 200 includes: a second determination unit and a third determination unit.

[0111] The second determination unit is used to determine a first target calibration table from a plurality of preset heating time calibration tables based on the current ambient temperature, and determine a target heating temperature according to the first time and the first target calibration table, wherein the first target calibration table includes a plurality of heating temperatures and a heating time for heating the coolant to each heating temperature;

[0112] The third determination unit is used to determine a second target calibration table from a plurality of preset defrosting time calibration tables based on the optimal hydrogen pressure range and the target heating temperature, and obtain a target valve opening and closing frequency according to the second time and the second target calibration table, wherein the second target calibration table includes a plurality of groups of valve opening and closing frequencies and a hydrogen circulation pump defrosting time corresponding to each group of valve opening and closing frequencies.

[0113] Optionally, in some embodiments, before determining the first target calibration table from a plurality of preset heating time calibration tables based on the current ambient temperature, the second determining unit is specifically configured to:

[0114] Determine multiple ambient temperature intervals to be calibrated and multiple heating temperatures; based on each ambient temperature interval to be calibrated, record the heating time for heating the coolant to each heating temperature; and obtain multiple preset heating time calibration tables based on the multiple ambient temperature intervals to be calibrated, the multiple heating temperatures and the heating time for heating the coolant to each heating temperature.

[0115] Optionally, in some embodiments, before determining the second target calibration table from a plurality of preset defrosting time calibration tables based on the optimal hydrogen pressure range and the target heating temperature, the third determining unit is further configured to:

[0116] Determine multiple hydrogen pressure intervals; in each ambient temperature interval to be calibrated, based on each heating temperature, record the defrosting time of the hydrogen circulation pump corresponding to each group of valve opening and closing frequencies in each hydrogen pressure interval; obtain multiple preset defrosting time calibration tables according to the defrosting time of the hydrogen circulation pump corresponding to each group of valve opening and closing frequencies under multiple heating temperatures, multiple hydrogen pressure intervals, multiple groups of valve opening and closing frequencies, and multiple groups of valve opening and closing frequencies.

[0117] Optionally, in some embodiments, when the valve frequency is adjusted according to the target valve opening and closing frequency to provide hydrogen to the fuel cell system, the heating module 300 further includes: a first sending unit and a judging unit.

[0118] Among them, the first sending unit is used to send a rotation instruction to the hydrogen circulation pump based on a preset instruction sending cycle; the judgment unit is used to obtain the real-time speed of the hydrogen circulation pump. If the real-time speed is less than the preset speed and the second continuous time that the real-time speed is less than the preset speed is greater than the preset time, the valve frequency is adjusted according to the target valve opening and closing frequency.

[0119] Optionally, in some embodiments, after adjusting the valve frequency according to the target valve opening and closing frequency to provide hydrogen to the fuel cell system, the heating module 300 further includes: a second acquisition unit and a second sending unit.

[0120] Among them, the second acquisition unit is used to obtain the total time currently used for defrosting; the second sending unit is used to send optical reminder information and / or acoustic reminder information to a preset mobile terminal when the total time currently used for defrosting is greater than the shortest total defrosting time.

[0121] It should be noted that the above explanation of the embodiment of the heating method for the hydrogen circulation pump is also applicable to the heating device for the hydrogen circulation pump of this embodiment, and will not be repeated here.

[0122] In the case of an integrated unit, the device may include a processing module and a storage module. When the device is applied to a car, the processing module may be used to control and manage the actions of the car. The storage module may be used to support the car to execute mutual program codes, etc.

[0123] The processing module may be a processor or a controller, which may implement or execute various exemplary logic blocks, modules and circuits disclosed in the present application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module may be a memory.

[0124] In summary, the heating device of the hydrogen circulation pump of the present application determines the shortest total ice-melting time according to the temperature range of the current ambient temperature when the current speed of the hydrogen circulation pump is less than the preset speed and the first continuous time of the current speed being less than the preset speed is greater than the preset time, determines the optimal hydrogen pressure range according to the shortest total ice-melting time, and determines the target heating temperature and the target valve opening and closing frequency according to the current ambient temperature, the optimal hydrogen pressure range and the shortest total ice-melting time, heats the coolant according to the temperature, and after the coolant temperature reaches the target heating temperature, adjusts the valve frequency according to the target valve opening and closing frequency until the current speed of the hydrogen circulation pump is greater than or equal to the preset speed. This method can solve the problem of hydrogen circulation pump freezing after the cold start of the fuel cell system, so that the system can start normally in a low temperature environment without causing the problem of fuel cell stack performance degradation.

[0125] An embodiment of the present application also provides a fuel cell system, which includes the heating device of the hydrogen circulation pump as described above.

[0126] The embodiment of the present application also provides a vehicle, Figure 4 is a schematic diagram of the structure of a vehicle provided in an embodiment of the present application, such as Figure 4 As shown, the vehicle may include a memory and a processor, wherein the memory stores executable program code, and the processor is used to call and execute the executable program code to execute the heating method of the hydrogen circulation pump provided in the embodiment of the present application.

[0127] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0128] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0129] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for heating a hydrogen circulation pump, characterized in that: The following steps are involved: Get the current speed and current ambient temperature of the hydrogen circulation pump; If the current speed is less than the preset speed and the first duration of the current speed being less than the preset speed is greater than the preset duration, a minimum total ice-melting time is determined according to the temperature interval of the current ambient temperature, an optimal hydrogen pressure interval is determined according to the shortest total ice-melting time, and a target heating temperature and a target valve opening and closing frequency are determined according to the current ambient temperature, the optimal hydrogen pressure interval and the shortest total ice-melting time; and The coolant is heated according to the target heating temperature, and after the coolant temperature reaches the target heating temperature, the valve frequency is adjusted according to the target valve opening and closing frequency until the current speed of the hydrogen circulation pump is greater than or equal to the preset speed.

2. The method according to claim 1, characterized in that The determining of the optimal hydrogen pressure range according to the shortest total deicing time comprises: Matching at least one target hydrogen pressure interval according to the shortest total deicing time, wherein there is no intersection between the at least one target hydrogen pressure interval; The minimum hydrogen pressure in the at least one target hydrogen pressure interval is determined, and the target hydrogen pressure interval corresponding to the minimum hydrogen pressure is used as the optimal hydrogen pressure interval.

3. The method according to claim 1, characterized in that The shortest total deicing time is the sum of a first time for heating the coolant to the target heating temperature at the current ambient temperature and a second time for deicing by adjusting the valve frequency according to the target valve opening and closing frequency based on the optimal pressure hydrogen interval. The target heating temperature and the target valve opening and closing frequency are determined according to the current ambient temperature, the optimal hydrogen pressure interval and the shortest total deicing time, including: Based on the current ambient temperature, determining a first target calibration table from a plurality of preset heating time calibration tables, and determining the target heating temperature according to the first time and the first target calibration table, wherein the first target calibration table includes a plurality of heating temperatures and a heating time for heating the coolant to each heating temperature; Based on the optimal hydrogen pressure range and the target heating temperature, a second target calibration table is determined from a plurality of preset defrosting time calibration tables, and the target valve opening and closing frequency is obtained according to the second time and the second target calibration table, wherein the second target calibration table includes a plurality of groups of valve opening and closing frequencies and the hydrogen circulation pump defrosting time corresponding to each group of valve opening and closing frequencies.

4. The method according to claim 3, characterized in that Before determining the first target calibration table from the preset multiple heating time calibration tables based on the current ambient temperature, the method further includes: Determine multiple ambient temperature intervals to be calibrated and multiple heating temperatures; Based on each ambient temperature interval to be calibrated, recording the heating time for heating the coolant to each heating temperature; The preset multiple heating time calibration tables are obtained according to the multiple ambient temperature intervals to be calibrated, the multiple heating temperatures and the heating time for heating the coolant to each heating temperature.

5. The method according to claim 4, characterized in that Before determining a second target calibration table from a plurality of preset defrosting time calibration tables based on the optimal hydrogen pressure range and the target heating temperature, the method further includes: Determining multiple hydrogen pressure intervals; In each of the ambient temperature intervals to be calibrated, based on each of the heating temperatures, the defrosting time of the hydrogen circulation pump corresponding to the opening and closing frequency of each group of valves in each of the hydrogen pressure intervals is recorded; The preset multiple defrosting time calibration tables are obtained according to the multiple heating temperatures, the multiple hydrogen pressure intervals, the multiple valve opening and closing frequencies and the hydrogen circulation pump defrosting time corresponding to each valve opening and closing frequency under the multiple valve opening and closing frequencies.

6. The method according to claim 1, characterized in that When the valve frequency is adjusted according to the target valve opening and closing frequency, it also includes: Based on a preset instruction sending cycle, sending a rotation instruction to the hydrogen circulation pump; The real-time rotation speed of the hydrogen circulation pump is obtained. If the real-time rotation speed is less than the preset rotation speed and the second duration during which the real-time rotation speed is less than the preset rotation speed is greater than the preset duration, the valve frequency is continuously adjusted according to the target valve opening and closing frequency.

7. The method according to claim 1, characterized in that After adjusting the valve frequency according to the target valve opening and closing frequency, the method further includes: Get the total time used for current defrosting; If the total time currently used for defrosting is greater than the shortest total defrosting time, an optical reminder message and / or an acoustic reminder message is sent to a preset mobile terminal.

8. A heating device for a hydrogen circulation pump, characterized in that: include: An acquisition module is used to acquire the current speed of the hydrogen circulation pump and the current ambient temperature; a determination module, configured to determine a minimum total deicing time according to a temperature interval in which the current ambient temperature is located, and determine an optimal hydrogen pressure interval according to the shortest total deicing time, when the current speed is less than a preset speed and a first duration in which the current speed is less than the preset speed is greater than a preset duration, and determine a target heating temperature and a target valve opening and closing frequency according to the current ambient temperature, the optimal hydrogen pressure interval and the shortest total deicing time; and The heating module is used to heat the coolant according to the target heating temperature, and after the coolant temperature reaches the target heating temperature, adjust the valve frequency according to the target valve opening and closing frequency until the current speed of the hydrogen circulation pump is greater than or equal to the preset speed.

9. A fuel cell system, characterized in that: include: The heating device for the hydrogen circulation pump as claimed in claim 8.

10. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the heating method for the hydrogen circulation pump as described in any one of claims 1 to 7.

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