Hydrogen fuel cell vehicle power battery overcharge prevention method, control device and storage medium

Abstract

Hydrogen fuel cell vehicle power battery overcharge prevention method, control device and storage medium under idle condition, comprising: step S1: judging fuel cell state, when fuel cell running state, execute step S2, when fuel cell purge state, execute step s3; Step s2 includes: step S21: obtaining FCU_P fex , BMS_P maxchg , VCU_P aux , and judging whether FCU_P fcs >BMS_P maxchg +VCU_P aux is established, and when the condition is established, sending fuel cell enable power VCU_P fcs and starting enable to fuel cell PTC heater and fuel cell radiator; Step S22: judging whether it is established, when the condition is not established, sending shutdown enable to fuel cell, when the condition is established, continuing fuel cell startup enable and enable power, and after time t, re-judging whether FCU_P fcs >BMS_P maxchg +VCU_P aux is established, when the condition is established, sending shutdown enable to fuel cell. The application is more reasonable in controlling fuel cell shutdown when solving the problem of power battery overcharge prevention, reduces the frequency of fuel cell shutdown and interruption in purging, and improves the service life of fuel cell.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydrogen fuel vehicles, in particular to a hydrogen fuel cell vehicle idling condition power battery overcharge prevention method, control device and storage medium. BACKGROUND

[0002] Hydrogen fuel cell vehicles are clean and pollution-free, and have entered the commercial demonstration operation stage. Due to the soft output characteristics and slow dynamic response of fuel cells, most fuel cell vehicles adopt a hybrid power form composed of fuel cells and power batteries. The power battery is a battery system that stores chemical energy internally and can directly provide power for air conditioning, interior lighting systems and the like. The fuel cell relies on external fuel supply and reacts with oxygen to generate electric energy. The electric energy generated by the hydrogen fuel cell can be directly converted into mechanical energy to drive the vehicle, or the electric energy can be stored in the power battery for later use by charging the power battery.

[0003] Currently, fuel cell system manufacturers limit the minimum output power, i.e. the lower limit of the output power, in order to prolong the service life of the fuel cell and reduce high potential attenuation. In particular, the minimum output power of high-power fuel cell systems is higher.

[0004] This means that when the power battery is limited due to low temperature or other abnormal conditions, the fuel cell system output power is continuously greater than the vehicle demand power, and the excess part charges the power battery, causing the power battery to be overcharged. This situation is more likely to occur under vehicle idling conditions due to the decrease in the vehicle's continuous demand power.

[0005] Under vehicle idling conditions, the fuel cell has two states: one is the fuel cell running state, in which the fuel cell maintains a relatively small power generation; the other is the fuel cell purging state, which can maintain the stable operation of the fuel cell and prolong its service life. Under the purging state, the fuel cell still has a certain power generation, which fully utilizes the residual fuel and oxygen after the fuel cell system is shut down.

[0006] In the prior art, under vehicle idling conditions, whether the fuel cell is in a running state or a purging state, once the power battery is limited due to low temperature or other abnormal conditions, the fuel cell is directly shut down from the perspective of protecting the power battery. This method is not reasonable and does not consider the situation where the power battery charging performance recovers when the fuel cell is in a running state. Directly shutting down the fuel cell will increase the frequency of starting and stopping the fuel cell, reducing the service life of the fuel cell. In addition, when the fuel cell is purging, the above problem occurs. In order to protect the power battery, the fuel cell is directly controlled to stop, the fuel cell system cannot or is insufficient to provide the power supply required for purging, thereby causing the purging to be interrupted, increasing the risk of water accumulation or even icing in the fuel cell system, and reducing the service life of the fuel cell. SUMMARY

[0007] In view of the deficiencies of the prior art, the present application provides a hydrogen fuel cell vehicle idle condition power battery overcharge prevention method, device and storage medium, which can more reasonably control the fuel cell shutdown when solving the problem of power battery overcharge prevention, reduce the frequency of fuel cell shutdown and interruption of purging,

[0008] A hydrogen fuel cell vehicle idle condition power battery overcharge prevention method, comprising:

[0009] Step S1: judging the fuel cell state, when the fuel cell state is the fuel cell running state, executing step S2, and when the fuel cell state is the fuel cell purging state, executing step S3;

[0010] Step S2 comprises:

[0011] Step S21: obtaining the real-time power FCU_P of the fuel cell system jck , the maximum allowable continuous charging power BMS_P of the power battery maxchg , the power VCU_P of the vehicle auxiliary system aux , and judging whether FCU_P fcs >BMS_P maxchg +VCU_P aux is true, and when the condition is true, sending the fuel cell enable power VCU_P fts to the FCU and starting the enable of the fuel cell PTC heater and the fuel cell radiator, wherein the fuel cell enable power VCU_P fcs is VCU_P fcs =FCU_P fcsmin ; Step S22: judging whether FCU_P fcsmin <BMS_P maxchg +VCU-P cax +FCU-P ptc +FCU_P rad is true, wherein FCU_P fcsmin is the minimum power of the fuel cell system, FCU_P ptc is the PTC heater power of the fuel cell, and FCU_P rad is the radiator power of the fuel cell, when the condition is not true, sending the shutdown enable to the fuel cell, and when the condition is true, continuing the fuel cell startup enable and enable power, and after a time t, re-judging whether FCU_P fcs >BMS_P maxchg +VCU_P aux is true, and when the condition is true, sending the shutdown enable to the fuel cell;

[0012] Step S3 comprises:

[0013] Step S31: obtaining real-time power FCU_P of fuel cell system jck , maximum allowed continuous charging power BMS_P of power battery maxchg , power VCU_P of vehicle auxiliary system aux , and determining whether FCU_P fcs >BMS_P maxchg +VCU_P aux is established, and enabling fuel cell PTC heater, fuel cell radiator and vehicle auxiliary system power when the condition is established.

[0014] Step S32: determining whether FCU-P fcsmin <BMS_P maxchg +VCU_P cdx +FCU_P prc +FCU_P rad is established, wherein FCU_P fcsmin is minimum power of fuel cell system, FCU_P ptc is PTC heater power of fuel cell, and FCU_P rad is radiator power of fuel cell, maintaining all current enabling and fuel cell purge state when the condition is established, and sending emergency stop enabling to fuel cell when the condition is not established.

[0015] Preferably, the time t is 60-120 seconds.

[0016] Preferably, in step S32, when the condition is established and all current enabling is maintained, the following steps are further executed: determining whether the purge is completed, and enabling fuel cell PTC heater, fuel cell radiator and vehicle air conditioner to be closed after the completion.

[0017] The application also discloses a hydrogen fuel cell vehicle idling condition power battery overcharge prevention control device, which comprises a memory and a processor.

[0018] The application also discloses a storage medium, wherein the storage medium stores a computer program, and the computer program is executed by the processor to realize the method in any of the above technical solutions.

[0019] 1: The application can more reasonably control fuel cell shutdown, reduce fuel cell shutdown and purge interruption frequencies, and prolong fuel cell service life when solving the problem of power battery overcharge prevention.

[0020] 2: The application, in step S22, if the minimum power FCU_P of the fuel cell system is 0, then send an emergency stop enable to the fuel cell to prevent overcharging of the power battery. fcsmin When the minimum power FCU_P of the fuel cell system is 0, an emergency stop enable is sent to the fuel cell to prevent overcharging of the power battery. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A flow chart of a method for preventing overcharging of a power battery in an idle speed operating condition of a hydrogen fuel cell vehicle. DETAILED DESCRIPTION

[0022] The following is a specific embodiment of the application and further describes the technical solutions of the application in conjunction with the drawings, but the application is not limited to these embodiments.

[0023] Embodiment 1: A method for preventing overcharging of a power battery in an idle speed operating condition of a hydrogen fuel cell vehicle, comprising:

[0024] Step S1: Determine the fuel cell state. When the fuel cell state is a fuel cell operating state, execute step S2. When the fuel cell state is a fuel cell purging state, execute step S3.

[0025] Step S2 comprises:

[0026] Step S21: Obtain the real-time power FCU_P of the fuel cell system, the maximum allowed continuous charging power BMS_P of the power battery, and the power VCU_P of the vehicle auxiliary system (including the power of the air pump, steering pump, air conditioner, and heater), and determine whether FCU_P > BMS_P + VCU_P is true. If true, it indicates that the output power of the fuel cell is greater than the demand power of the vehicle. At this time, send the fuel cell enable power VCU_P to the FCU and start the enable of the fuel cell PTC heater and the fuel cell radiator, wherein the fuel cell enable power VCU_P is VCU_P = FCU_P, and FCU_P is the minimum power of the fuel cell system. This execution step reduces the power of the fuel cell, forcibly starts the fuel cell PTC heater and the fuel cell radiator, and can reduce the charging power of the fuel cell to the power battery. jcs maxchg aux fcs maxchg aux fcs fcs fcs fcsmin fcsmin

[0027] Step S22: Determine whether FCU_P < BMS_P + VCU_P + FCU_P is true. If true, it indicates that the output power of the fuel cell is less than the demand power of the vehicle. At this time, send an emergency stop enable to the fuel cell to prevent overcharging of the power battery. fcsmin maxchg aus ptc rad ​​​​​​​​​​​​​​​whether FCU_P fcsmin is greater than FCU_P ptc , FCU_P rad is fuel cell radiator power, when the condition is not established, it means that even if the fuel cell is started 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 the power battery, when the condition is established, the situation that the power battery charging capacity is restored is considered, so at this time, the fuel cell startup enable and the enable power are continued, and after a time t, the FCU_P fcs is greater than BMS_P maxchg + VCU_P aux , if not, it means that the power battery charging capacity is restored, and the fuel cell does not need to be shut down, if it is established, it means that the power battery charging capacity has not been restored, at this time, the shutdown enable is sent to the fuel cell to shut down the fuel cell, thereby protecting the power battery. When the fuel cell is shut down, the purge process is executed, and the purge is not interrupted.

[0028] Step S3 comprises:

[0029] Step S31: obtain the real-time power FCU_P fcs of the fuel cell system, the maximum allowed continuous charging power BMS_P maxchg of the power battery, and the power VCU_P aux of the vehicle auxiliary system, and determine whether FCU_P fcs is greater than BMS_P maxchg + VCU_P aux , if it is established, it means that the output power of the fuel cell in the purge state is greater than the demand power of the vehicle, at this time, the startup enable of the fuel cell PTC heater, the fuel cell radiator, and the vehicle auxiliary system power is enabled, this execution step forces the startup of the fuel cell PTC heater, the fuel cell radiator, and the vehicle auxiliary system, which can reduce the charging power of the fuel cell to the power battery;

[0030] Step S32: determine whether FCU_P fcsmin is less than BMS_P maxchg + VCU_P cus + FCU_P ptc + FCU_P rad , wherein FCU_P fcsmin is the minimum power of the fuel cell system, FCU_P ptc is the fuel cell PTC heater power, and FCU_P radThe 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.

[0031] 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.

[0032] In the above scheme, the time t is 60 to 120 seconds, preferably t=60 seconds.

[0033] 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.

[0034] 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 fcsmin When 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.

[0035] 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.

[0036] 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.

[0037] Embodiment 4, in this embodiment, also relates to a storage medium, on which a computer program is stored, which, when executed by a processor, implements the method as in Embodiment 1 or Embodiment 2.

[0038] The above-described embodiments are only preferred embodiments of the present application, and are not intended to limit the concept and scope of the present application. Various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art without departing from the design concept of the present application shall fall within the protection scope of the present application. The technical content claimed by the present application has been fully recorded in the claims.

Claims

1. A method for preventing power battery overcharging during idling of a hydrogen fuel cell vehicle, characterized in that: include: 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. Step S2 includes: 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 , 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 ; 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 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; 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 maxchg , 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; Step S32: Determine FCU_P fcsmin <BMS-P maxchg +VCU_P aux +FCU_P ptc +FCU-P rcd 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.

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. The method for preventing power battery overcharging during idling 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. The 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 fuel cell system minimum power FCU_P fcsmin When it is 0, an emergency stop enable is sent to the fuel cell.

5. The 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 fuel cell system minimum power FCU_P 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 according to 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 according to any one of claims 1 to 5 is implemented.

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