Method for preventing overcharging of power battery under idling working condition of hydrogen fuel cell vehicle, control device, and storage medium

Abstract

A method for preventing overcharging of a power battery under an idling working condition of a hydrogen fuel cell vehicle, a control device, and a storage medium. The method comprises: step S1: determining the state of a fuel cell; when the fuel cell is in an operating state, executing step S2; and when the fuel cell is in a purging state, executing step S3. Step S2 comprises: step S21: acquiring FCU_Pfex, BMS_Pmaxchg, and VCU_Paux, determining whether FCU_Pfcs>BMS_Pmaxchg+VCU_Paux is satisfied, and if the condition is satisfied, sending a fuel cell enable power VCU_Pfcs to an FCU, and sending startup enable to a fuel cell PTC heater and a fuel cell heat dissipation device; and step S22: determining whether FCU_Pfcsmin<BMS_Pmaxchg+VCU_Paux+FCU_Pptc+FCU_Prad is satisfied; if the condition is not satisfied, sending shutdown enable to the fuel cell; if the condition is satisfied, keeping the startup enable and the enable power of the fuel cell, and after a time t has elapsed, determining again whether FCU_Pfcs>BMS_Pmaxchg+VCU_Paux is satisfied; and if the condition is satisfied, sending shutdown enable to the fuel cell. According to the present invention, the shutdown of the fuel cell can be more reasonably controlled while overcharging of the power battery is prevented, so that the frequency of startup and shutdown of the fuel cell and the frequency of purge interruption are reduced, thereby prolonging the service life of the fuel cell.

Description

Method, control device, and storage medium for preventing power battery overcharging during idling of hydrogen fuel cell vehicles Technical Field

[0001] The present invention relates to the field of hydrogen fuel vehicles, and in particular to a method, a control device, and a storage medium for preventing power batteries from overcharging under idling conditions of hydrogen fuel cell vehicles. Background Art

[0002] Hydrogen fuel cell vehicles are clean and pollution-free and have entered the commercial demonstration operation phase. Due to the soft output characteristics and slow dynamic response of fuel cells, most fuel cell vehicles utilize a hybrid system consisting of a fuel cell and a power battery. A power battery is a battery system that internally stores chemical energy and can directly provide power for air conditioning, interior lighting, and other systems. Fuel cells rely on externally supplied fuel, which reacts with oxygen to generate electricity. The electricity generated by hydrogen fuel cells can be directly converted into mechanical energy to drive the vehicle, or it can be charged and stored in the power battery for later use.

[0003] At present, fuel cell system manufacturers limit the lower limit of output power, that is, the minimum output power, in order to extend the service life of fuel cells and reduce high-voltage attenuation. Especially for high-power fuel cell systems, the minimum output power will be higher.

[0004] This means that when the power battery's charging is restricted due to low temperatures or other abnormal conditions, there is a risk that the fuel cell system's output power will continuously exceed the vehicle's required power, and the excess will be used to charge the power battery, causing the power battery to overcharge. This situation is more likely to occur when the vehicle is idling because the vehicle's required power is continuously reduced.

[0005] When the vehicle is idling, the fuel cell has two states. One is the fuel cell operating state. In this state, the fuel cell maintains a relatively small power generation capacity. The other is the fuel cell purge state. Purge can maintain the stable operation of the fuel cell and extend its life. In the purge state, the fuel cell still has a certain power generation capacity, making full use of the fuel and oxygen remaining after the fuel cell system is shut down.

[0006] In existing technology, when the vehicle is idling, regardless of whether the fuel cell is in operation or in purge mode, once the power battery's charging is restricted due to low temperature or other abnormal conditions, the fuel cell is directly shut down to protect the power battery. This method is not reasonable and does not take into account the situation where the power battery's charging performance recovers when the fuel cell is in operation. Direct shutdown increases the frequency of fuel cell startup and shutdown, reducing the service life of the fuel cell. In addition, when the above-mentioned problem occurs during fuel cell purge, the fuel cell system is directly shut down to protect the power battery. The fuel cell system cannot or is insufficient to provide the power supply required for purge, which will lead to purge interruption, increasing the risk of water accumulation or even ice formation inside the fuel cell system, and reducing the service life of the fuel cell.

[0007] Summary of the Invention

[0008] In view of the shortcomings of the existing technology, the present invention provides a method, device and storage medium for preventing power battery overcharge under idling conditions of hydrogen fuel cell vehicles. When solving the problem of preventing power battery overcharge, the fuel cell shutdown is more reasonably controlled, and the frequency of fuel cell startup and shutdown and purge interruption is reduced.

[0009] A method for preventing power battery overcharging of a hydrogen fuel cell vehicle under idling conditions, comprising:

[0010] Step S1: Determine the fuel cell state. When the fuel cell state is in the fuel cell operating state, execute step S2. When the fuel cell state is in the fuel cell purging state, execute step S3.

[0011] Step S2 includes:

[0012] Step S21: Obtain the real-time power FCU_P of the fuel cell system fcs , Maximum allowable continuous charging power of power battery Vehicle auxiliary system power VCU_P aux , and judge FCU_P fcs >BMS_P maxchg +VCU_P aux If the condition is met, the fuel cell enable power VCU_P is sent to the FCU. fcs And start the fuel cell PTC heater and fuel cell radiator, where the fuel cell enable power VCU_P fcs VCU_P fcs =FCU_P fcsmin ;

[0013] Step S22: Determine FCU_P fcsmin <BMS_P maxchg +VCU_P aux +FCU_Pptc +FCU_P rad Is it true, where FCU_P fcsmin is the minimum power of the fuel cell system, FCU_P ptc is the fuel cell PTC heater power, FCU_P rad The fuel cell radiator power, when the condition is not met, the fuel cell is sent to shut down enable, when the condition is met, the fuel cell start enable and enable power are continued, and after time t, the FCU_P is re-judged fcs >BMS_P maxchg +VCU_P aux If the condition is met, a shutdown enable signal is sent to the fuel cell;

[0014] Step S3 includes:

[0015] Step S31: Obtaining the real-time power FCU_P of the fuel cell system fcs , Maximum allowable continuous charging power of power battery Vehicle auxiliary system power VCU_P aux , and judge FCU_P fcs >BMS_P maxchg +VCU_P aux Is it established? If the conditions are established, the fuel cell PTC heater, fuel cell radiator, and vehicle auxiliary system power start-up are enabled;

[0016] Step S32: Determine FCU_P fcsmin <BMS_P maxchg +VCU_P aux +FCU_P ptc +FCU_P rad Is it true, where FCU_P fcsmin is the minimum power of the fuel cell system, FCU_P ptc is the fuel cell PTC heater power, FCU_P rad For the fuel cell radiator power, when the condition is met, all current startup enables and fuel cell purge states are maintained. When the condition is not met, an emergency stop enable is sent to the fuel cell.

[0017] Preferably, the time t is 60 to 120 seconds.

[0018] Preferably, in step S32, when the conditions are met and all current startup enables are maintained, the following steps are also performed: determining whether the purge is completed, and after completion, shutting down the fuel cell PTC heater, fuel cell radiator, and vehicle air conditioner.

[0019] The present invention also discloses a control device for preventing power battery overcharging under idling conditions of a hydrogen fuel cell vehicle, comprising a memory and a processor; the memory is used to store a computer program; the processor is used to implement the method described in any of the above technical solutions when executing the computer program.

[0020] The present invention also discloses a storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method described in any of the above technical solutions is implemented. In summary, the present invention has the following beneficial effects:

[0021] 1: The present invention, while solving the problem of preventing overcharging of power batteries, more reasonably controls the shutdown of the fuel cell, reduces the frequency of fuel cell startup and shutdown and the frequency of purge interruption, and increases the service life of the fuel cell.

[0022] 2: In the present invention, in step S22, if the minimum power FCU_P of the fuel cell system fcsmin When it is 0, an emergency stop signal is sent to the fuel cell to prevent the power battery from overcharging. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a flow chart of a method for preventing power battery overcharging during idling conditions of a hydrogen fuel cell vehicle. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0025] Example 1: A method for preventing power battery overcharging during idling of a hydrogen fuel cell vehicle, comprising:

[0026] Step S1: Determine the fuel cell state. When the fuel cell state is in the fuel cell operating state, execute step S2. When the fuel cell state is in the fuel cell purging state, execute step S3.

[0027] Step S2 includes:

[0028] Step S21: Obtain the real-time power FCU_P of the fuel cell system fcs , Maximum allowable continuous charging power of power battery BMS_P maxchg , vehicle auxiliary system power VCU_P aux (including air pump, steering pump, air conditioning, heater, etc. power), and judge FCU_P fcs >BMS_P maxchg +VCU_P aux Is it true? If so, it means that the output power of the fuel cell is greater than the required power of the vehicle. At this time, the fuel cell enable power VCU_P is sent to the FCU. fcsAnd start the fuel cell PTC heater and fuel cell radiator, where the fuel cell enable power VCU_P fcs VCU_P fcs =FCU_P fcsmin , FCU_P fcsmin To achieve the minimum power of the fuel cell system, this step is performed to reduce the fuel cell power and forcibly start the fuel cell PTC heater and fuel cell radiator, which can reduce the charging power of the fuel cell to the power battery;

[0029] Step S22: Determine FCU_P fcsmin <BMS_P maxchg +VCU_P aux +FCU_P ptc +FCU_P rad Is it true, where FCU_P fcsmin is the minimum power of the fuel cell system, FCU_P ptc is the fuel cell PTC heater power, FCU_P rad is the fuel cell radiator power. When the condition is not met, it means that even if the fuel cell is turned on at the minimum power, the output power of the fuel cell is still redundant. At this time, the shutdown enable is sent to the fuel cell to prevent overcharging of the power battery. When the condition is met, considering that the charging capacity of the power battery has been restored, the fuel cell startup enable and enable power are continued at this time, and after time t, the FCU_P is re-judged. fcs >BMS_P maxchg +VCU_P aux Is it true? If not, it means that the power battery charging capacity has recovered and the fuel cell does not need to be shut down. If it is true, it means that the power battery charging capacity has not recovered. At this time, a shutdown enable is sent to the fuel cell to shut down the fuel cell to protect the power battery. When the fuel cell is shut down, the purge process is executed and the purge is not interrupted.

[0030] Step S3 includes:

[0031] Step S31: Obtaining the real-time power FCU_P of the fuel cell system fcs , Maximum allowable continuous charging power of power battery Vehicle auxiliary system power VCU_P aux , and judge FCU_P fcs >BMS_P maxchg +VCU_P auxIs it true? If so, it means that the output power of the fuel cell in the purge state is greater than the required power of the vehicle. At this time, the fuel cell PTC heater, fuel cell radiator, and vehicle auxiliary system power start-up enable are enabled. This execution step forces the fuel cell PTC heater, fuel cell radiator, and vehicle auxiliary system to start, which can reduce the charging power of the fuel cell to the power battery;

[0032] Step S32: Determine FCU_P fcsmin <BMS_P maxchg +VCU_P aux +FCU_P ptc +FCU_P rad Is it true, where FCU_P fcsmin is the minimum power of the fuel cell system, FCU_P ptc is the fuel cell PTC heater power, FCU_P rad The fuel cell radiator power. When the condition is met, it means that if the fuel cell is started at minimum power, the fuel cell output power is less than the vehicle's required power, and the power battery will not be overcharged. At this time, all current startup enables are maintained, and a fuel cell shutdown command is sent to maintain the fuel cell purge state. The fuel cell system provides the power required for purge. Purge is uninterrupted, reducing the risk of water accumulation or even freezing inside the fuel cell system and extending the fuel cell's service life. When the condition is not met, it means that even if the fuel cell is started at minimum power, the fuel cell output power is still excessive. At this time, an emergency stop is sent to the fuel cell to prevent overcharging of the power battery. When the fuel cell is emergency stopped, actions such as purge cannot be performed.

[0033] In summary, this method, when considering the prevention of overcharging of the power battery, can more reasonably control the shutdown of the fuel cell, reduce the frequency of fuel cell startup and shutdown and the frequency of purge interruption, and improve the service life of the fuel cell.

[0034] In the above scheme, the time t is 60 to 120 seconds, preferably t=60 seconds.

[0035] In step S32 of the above scheme, when the conditions are met and all current startup enables are maintained, the following steps are also performed: determining whether the purge is completed, and after completion, shutting down the fuel cell PTC heater, fuel cell radiator, and vehicle air conditioner, thereby reducing the vehicle's power consumption.

[0036] Example 2: In low temperature environments, especially those with temperatures between 10 and 20 degrees Celsius below zero, data transmission equipment such as data cables and wireless modules may be frozen or damaged, resulting in data acquisition failure. When the minimum power FCU_P of the fuel cell system is fcsminWhen the value is 0, if the judgment condition in step S22 is directly executed, the judgment condition will be met but the power battery is not actually allowed to be charged, resulting in overcharging of the power battery. Therefore, different from embodiment 1, in step S22 of the above solution, if the minimum power FCU_P of the fuel cell system is fcsmin When it is 0, an emergency stop enable is sent to the fuel cell. The existence of this step effectively avoids the above situation.

[0037] Similarly, in step S32 of the above solution, if the minimum power FCU_P of the fuel cell system is fcsmin When it is 0, an emergency stop signal is sent to the fuel cell to prevent the power battery from overcharging.

[0038] Example 3. This embodiment also relates to a control device for preventing power battery overcharging under idling conditions of a hydrogen fuel cell vehicle, comprising a memory and a processor; the memory is used to store a computer program; the processor is used to implement the method described in Example 1 or Example 2 when executing the computer program.

[0039] Example 4: This embodiment also relates to a storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method described in Example 1 or Example 2 is implemented.

[0040] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Any modifications and improvements to the technical solution of the present invention made by a person of ordinary skill in the art without departing from the design concept of the present invention shall fall within the scope of protection of the present invention. The technical content for which protection is sought in the present invention is fully set forth in the claims.

Claims

1. [Corrected 19.02.2024 according to Rule 26] A method for preventing power battery overcharge in a hydrogen fuel cell vehicle under idling conditions, characterized in that: include: Step S1: judging the state of the fuel cell, when the state of the fuel cell is the fuel cell running state, executing step S2, when the state of the fuel cell is the fuel cell purging state, executing step S3; Step S2 includes: Step S21: Obtaining the real-time power FCU_P of the fuel cell system fcs , Maximum allowable continuous charging power of power battery BMS_P max chg 、VCU_P of vehicle auxiliary system aux , and determine FCU_P fcs >BMS_P max chg +VCU_P aux Is it true? If the condition is true, send the fuel cell enable power VCU_P to the FCU. fcs And enable the fuel cell PTC heater and fuel cell radiator, where the fuel cell enable power VCU_P fcs VCU_P fcs =FCU_P fcs min ; Step S22: Determine FCU_P fcs min <BMS_P max chg +VCU_P aux +FCU_P ptc +FCU_P rad Is it true, where FCU_P fcs min is the minimum power of the fuel cell system, FCU_P ptc is the fuel cell PTC heater power, FCU_P rad is the fuel cell radiator power. When the condition is not met, the shutdown enable is sent to the fuel cell. When the condition is met, the fuel cell startup enable and enable power are continued, and after time t, FCU_P is re-judged. fcs >BMS_P max chg +VCU_P aux Whether the condition is met, and when the condition is met, a shutdown enable is sent to the fuel cell; Step S3 includes: Step S31: Obtaining the real-time power FCU_P of the fuel cell system fcs , Maximum allowable continuous charging power of power battery BMS_P max chg 、VCU_P of vehicle auxiliary system aux , and determine FCU_P fcs >BMS_P max chg +VCU_P aux Whether it is established, and when the conditions are established, the fuel cell PTC heater, fuel cell radiator, and vehicle auxiliary system power start enable; Step S32: Determine FCU_P fcs min <BMS_P max chg +VCU_P aux +FCU_P ptc +FCU_P rad Is it true, where FCU_P fcs min is the minimum power of the fuel cell system, FCU_P ptc is the fuel cell PTC heater power, FCU_P rad It is the fuel cell radiator power. When the condition is met, all current startup enables and fuel cell purge states are maintained. When the condition is not met, an emergency stop enable is sent to the fuel cell.

2. A method for preventing power battery overcharging during idling of a hydrogen fuel cell vehicle according to claim 1, characterized in that: The time t is 60 to 120 seconds.

3. A method for preventing power battery overcharging under idling conditions of a hydrogen fuel cell vehicle according to claim 1, characterized in that: In step S32, when the conditions are met and all current startup enables are maintained, the following steps are also performed: determining whether the purge is completed, and after completion, shutting down the fuel cell PTC heater, fuel cell radiator, and vehicle air conditioner.

4. A method for preventing power battery overcharging during idling of a hydrogen fuel cell vehicle according to claim 1, characterized in that: In step S22, if the minimum power FCU_P of the fuel cell system fcsmin When it is 0, an emergency stop enable is sent to the fuel cell.

5. A method for preventing power battery overcharging during idling of a hydrogen fuel cell vehicle according to claim 1, characterized in that: In step S32, if the minimum power FCU_P of the fuel cell system fcsmin When it is 0, an emergency stop enable is sent to the fuel cell.

6. A hydrogen fuel cell vehicle power battery overcharge prevention control device under idling conditions, characterized in that: The invention comprises a memory and a processor; the memory is used to store a computer program; the processor is used to implement the method as claimed in any one of claims 1 to 5 when executing the computer program.

7. A storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the method as claimed in any one of claims 1 to 5 is implemented.

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