Power request method for hybrid vehicle, readable storage medium and vehicle

Abstract

The application belongs to the technical field of hybrid electric vehicles, and particularly relates to a power request method for a hybrid electric vehicle, a readable storage medium and a vehicle. The application comprises the following steps: determining a target SOC range of a power battery, dividing the target SOC range into at least two working intervals, and setting a power correction parameter for each working interval; when the SOC of the power battery is within the target SOC range, obtaining a requested power sent to a fuel cell according to the power correction parameter of the working interval in which the SOC is located. The application can better resist the disturbance of the change of the required power of the vehicle on the SOC of the power battery, can better maintain the SOC of the power battery within the target SOC range, thereby maintaining high power performance and energy recovery performance, improving NVH performance, and avoiding overcharging.

Description

Technical Field

[0001] This invention belongs to the field of hybrid electric vehicle technology, specifically relating to a power request method for hybrid electric vehicles, a readable storage medium, and a vehicle. Background Technology

[0002] With increasing emphasis on environmental protection, fuel cells, due to their clean combustion and emission methods, are gradually gaining acceptance and are hailed as the ultimate energy source of the 21st century. Hybrid electric vehicles equipped with fuel cells typically utilize a combination of fuel cells and a power battery. The fuel cell acts as a range extender to ensure continuous vehicle operation, while the power battery handles the vehicle's power response and energy recovery. Current technology requests different constant power from the fuel cell based on the power battery's State of Charge (SOC), without considering the overall vehicle power demand. This can lead to overcharging of the power battery, affecting its lifespan, or excessively low SOC, resulting in reduced discharge power and impacting power performance and overall vehicle NVH (Noise, Vibration, and Harshness) performance. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art and provide a power request method for hybrid electric vehicles.

[0004] This invention is achieved through the following technical solution: a power request method for a hybrid electric vehicle, comprising the following steps:

[0005] Determine the target SOC range of the power battery, divide the target SOC range into at least two working intervals, and set power correction parameters for each working interval.

[0006] When the SOC of the power battery is within the target SOC range, the requested power is obtained to the fuel cell based on the power correction parameters of the operating range where the SOC is located.

[0007] Furthermore, the target SOC range of a power battery refers to the SOC range with high discharge performance, where high discharge performance means that the maximum discharge power reaches 50kW or more within 2 seconds.

[0008] Further, four - level thresholds are set within the target SOC range, namely: SOC1, SOC2, SOC3, SOC4, and SOC1 < SOC2 < SOC3 < SOC4. SOC1 and SOC4 are the lower limit value and the upper limit value of the target SOC range respectively; three working intervals are divided according to the four - level thresholds: SOC1 - SOC2 is the first working interval, SOC2 - SOC3 is the second working interval, and SOC3 - SOC4 is the third working interval.

[0009] Further, when the SOC of the power battery is within the first working interval, the requested power is calculated according to the following formula:

[0010] P req =min(P bat_chg_max *P scofac ,P bat_chg_max -P offset )

[0011] In the formula, P req represents the requested power; P bat_chg_max represents the maximum charging power of the power battery; P scofac represents the first power correction parameter determined according to SOC, 0 < P scofac ≤1; P offset represents the preset difference of charging power.

[0012] Further, when the SOC of the power battery is within the second working interval, the requested power is calculated according to the following formula:

[0013] P req =min(P Dem +P socoffset ,P bat_chg_max -P offset )

[0014] In the formula, P req represents the requested power; P bat_chg_max represents the maximum charging power of the power battery; P Dem represents the vehicle demand power; P socoffset represents the second power correction parameter; P offset represents the preset difference of charging power.

[0015] Further, the preset difference of charging power P offset The preset difference of charging power P offset has a value range of 1 - 3 kW.

[0016] Further, when the SOC of the power battery is within the third working interval, the requested power is calculated according to the following formula:

[0017] P req =Pbat_chg_max *P′ scofac

[0018] In the formula, P req Indicates the requested power; P bat_chg_max This indicates the maximum charging power of the power battery; P′ scofac Let P' represent the third power correction parameter. scofac =0;

[0019] According to the third power correction parameter P′ scofac The requested power is 0, and the fuel cell is controlled to be in standby mode.

[0020] Furthermore, when the SOC of the power battery is less than the lower limit of the target SOC range, the optimal discharge power P of the fuel cell is compared. eff With the maximum charging power P of the power battery bat_chg_max The optimal discharge power P eff This refers to the maximum discharge power at the maximum conversion efficiency, where maximum conversion efficiency is the maximum efficiency by which the fuel cell converts chemical energy into electrical energy. The minimum of the two values ​​is taken. If the vehicle's required power P Dem If the value is greater than the specified value, then the maximum charging power P of the power battery is used. bat_chg_max The requested power P sent to the fuel cell req If the total vehicle power requirement P Dem If the value is less than or equal to the smaller value, then the smaller value is used as the requested power P. req .

[0021] Furthermore, when the SOC of the power battery is greater than the upper limit of the target SOC range, the requested power sent to the fuel cell is 0, and the fuel cell stops operating.

[0022] Furthermore, the target SOC range is 30% to 80%, the first working interval is 30% ≤ SOC ≤ 50%, the second working interval is 50% < SOC ≤ 70%, and the third working interval is 70% < SOC ≤ 80%.

[0023] The present invention also provides a computer-readable storage medium storing at least one computer-executable program, which, when executed by the computer, causes the computer to perform the steps of the power request method for a hybrid electric vehicle of the present invention.

[0024] The present invention also provides a vehicle including the computer-readable storage medium of the present invention.

[0025] Compared with the prior art, the beneficial effects of the present invention include:

[0026] When the SOC of the power battery is within the target SOC range, this invention can effectively resist the disturbances to the SOC of the power battery caused by changes in the vehicle's power demand, maintain the SOC of the power battery within the target SOC range, preserve high power performance and energy recovery performance, improve NVH performance, and prevent overcharging. When the SOC of the power battery is outside the target SOC range, this invention can quickly adjust the SOC of the power battery back to the target SOC range. Attached Figure Description

[0027] Figure 1 This is a flowchart of the power request method for a hybrid electric vehicle in Example 1. Detailed Implementation

[0028] When the State of Charge (SOC) of a power battery is maintained within the target SOC range, the battery exhibits high discharge performance and energy recovery capabilities. Conversely, an excessively low SOC leads to insufficient vehicle power performance, while an excessively high SOC reduces the battery's charging power and weakens energy recovery, which refers to the motor outputting negative torque to charge the power battery.

[0029] To better maintain the state of charge (SOC) of the power battery within the target SOC range, this invention provides a power request method for hybrid electric vehicles, the method comprising the following steps:

[0030] The target SOC range of the power battery is determined, the target SOC range is divided into at least two working intervals, and corresponding power correction parameters are set for each working interval. The power correction parameters are used to adjust the amount of power requested to the fuel cell according to the SOC.

[0031] When the SOC of the power battery is within the target SOC range, the requested power is obtained to the fuel cell based on the power correction parameters of the operating range where the SOC is located.

[0032] The target SOC range of a power battery refers to the SOC range with high discharge performance. High discharge performance means that the maximum discharge power reaches more than 50kW within 2 seconds. It is determined by the characteristics of the power battery itself. Different types of power batteries have different target SOC ranges. This specific implementation takes a power-type power battery as an example for explanation, and its target SOC range is 30% to 80%.

[0033] It should be noted that the fuel cell can directly supply power to the motor and also charge the power battery, and the power battery can also directly supply power to the motor. The electric power output by the fuel cell according to the requested power is preferentially provided to the motor to meet the power demand of the whole vehicle. If the requested power exceeds the power demand of the whole vehicle, the excess part is used to charge the power battery. If the requested power cannot meet the power demand of the whole vehicle, the difference between the power demand of the whole vehicle and the requested power is provided by the power battery to the motor.

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] Embodiment 1

[0036] In this embodiment, four-level thresholds are set within the target SOC range, namely: SOC1, SOC2, SOC3, SOC4, and SOC1 < SOC2 < SOC3 < SOC4. Among them, SOC1 and SOC4 are the lower limit value and the upper limit value of the target SOC range respectively.

[0037] Three working intervals are divided according to the four-level thresholds: SOC1~SOC2 is the first working interval, SOC2~SOC3 is the second working interval, and SOC3~SOC4 is the third working interval; in this embodiment, the first working interval is 30% ≤ SOC ≤ 50%, the second working interval is 50% < SOC ≤ 70%, and the third working interval is 70% < SOC ≤ 80%. For each working interval, different methods are used to calculate the requested power.

[0038] The following references Figure 1 will make a more specific description of the power request method of the hybrid vehicle adopted in this embodiment.

[0039] When the SOC of the power battery is less than the lower limit value of the target SOC range, compare the optimal discharge power P eff of the fuel cell with the maximum charging power P bat_chg_max of the power battery, and take the smaller value of the two as the smaller value; if the power demand P Dem of the whole vehicle is greater than the smaller value, then take the maximum charging power P bat_chg_max of the power battery as the requested power P req sent to the fuel cell. In this way, under the constraint of the maximum charging power of the power battery, the charging power can be increased as much as possible, so that the SOC can be restored to the target SOC range as soon as possible; if the power demand P Dem of the whole vehicle is less than or equal to the smaller value, then take the smaller value as the requested power P req . In this way, it can not only increase the SOC but also take into account the economy of fuel cell power generation.

[0040] The optimal discharge power P effThis refers to the maximum discharge power at the maximum conversion efficiency, which is the maximum conversion efficiency by which a fuel cell converts chemical energy into electrical energy. For example, a fuel cell has a maximum discharge power of 70kW at a conversion efficiency of 30%, and a maximum discharge power of 50kW at a conversion efficiency of 60%. Therefore, the optimal discharge power is 50kW.

[0041] Optimal discharge power P eff The universal characteristic diagram of a fuel cell can be obtained. The universal characteristic diagram of a fuel cell and its generation method are existing technologies. Please refer to "Chinese Patent (CN110993992A) "Method for Generating Universal Characteristic Diagram of Fuel Cell System", which will not be elaborated here.

[0042] When the SOC of the power battery is less than the lower limit of the target SOC range, a special case needs to be explained: when the power demand of the vehicle is greater than the smaller value, although the requested power is the maximum charging power of the power battery, the optimal discharge power of the fuel cell is less than the maximum charging power of the power battery, the fuel cell outputs at its own maximum discharge power.

[0043] Specifically, when the SOC of the power battery is less than the lower limit of the target SOC range, the code for calculating the requested power is as follows:

[0044] If P Dem ≤min(P bat_chg_max P eff )

[0045] P req =min(P bat-chg_max P eff )

[0046] Else P req =P bat_chg_max

[0047] In this invention, "min()" refers to the minimum value operation.

[0048] When the SOC of the power battery is within the target SOC range, the corresponding power correction parameters are obtained according to the operating range of the SOC. Under the premise of limiting the requested power to be less than the maximum charging power of the power battery, the requested power is calculated based on the maximum charging power of the power battery or the required power of the vehicle, according to the power correction parameters, so that the requested power can decrease as the SOC increases, as follows:

[0049] When the SOC of the power battery is within the first operating range of the target SOC range, the requested power is calculated according to the following formula:

[0050] P req =min(P bat_chg_max*P scofac P bat_chg_max -P offset )

[0051] In the formula, P req Indicates the requested power; P bat_chg_max P represents the maximum charging power of the power battery. scofac This indicates that the first power correction parameter (i.e., the power correction parameter for the first operating range) is determined based on the SOC, 0 <P scofac ≤1; P offset This indicates the preset difference in charging power.

[0052] When the SOC of the power battery is within the first operating range, the primary goal is to increase the SOC due to its low SOC level. Therefore, the calculation formula is based on the maximum charging power of the power battery, and then adjusted using the first power correction parameter P. scofac To adjust the requested power based on the SOC, and at the same time, P in the formula bat_chg_max -P offset This feature can limit the requested power to less than the maximum charging power of the power battery to prevent overcharging.

[0053] The first power correction parameter P scofac Obtained by looking up a table, as shown in Table 1:

[0054] Table 1 (SOC - First Power Correction Parameter P) scofac Mapping table)

[0055] <![CDATA[P scofac ]]> 1 1 1 1 1 1 0.8 0.6 0.4 0.3 0.2

[0056] Table 1 lists the first power correction parameter P corresponding to the discrete values ​​of SOC. scofac For SOCs not listed in the table, the corresponding first power correction parameter P is obtained through interpolation. scofac In this embodiment, the mean interpolation method is used. For example, if the SOC is 45%, then 0.6 and 0.4 are taken respectively for 44% and 46%, and the average value of the two is calculated to be 0.5. Therefore, the first power correction parameter P when the SOC is 45% is... scofac It is 0.5.

[0057] When the SOC of the power battery is within the second operating range of the target SOC range, the requested power is calculated according to the following formula:

[0058] P req =min(P Dem +P socoffset P bat_chg_max -P offset )

[0059] In the formula, P req Indicates the requested power; Pbat_chg_max P represents the maximum charging power of the power battery. Dem P represents the total power required by the vehicle. socoffset This indicates that P represents the second power correction parameter determined based on the SOC (i.e., the power correction parameter for the second operating range). socoffset ≤0; P offset This represents the preset difference in charging power. In this embodiment, the preset difference in charging power P offset The value range is 1 to 3 kW.

[0060] The second power correction parameter P socoffset Obtained by looking up a table, as shown in Table 2:

[0061] Table 2 (SOC-P) socoffset Mapping table)

[0062] <![CDATA[P socoffset ]]> 0 0 0 -2 -4 -10 -10 -20

[0063] Table 2 lists the second power correction parameter P corresponding to the discrete values ​​of SOC. socoffset For SOCs not listed in the table, the corresponding second power correction parameter P is obtained through interpolation. socoffset In this embodiment, the mean interpolation method is used. For example, if the SOC is 65%, then -2 and -4 are taken respectively for 64% and 66%, and the average value is -3. Then, the second power correction parameter P when the SOC is 65% is calculated. socoffset It is -3.

[0064] When the SOC of the power battery is within the second operating range, due to the higher SOC, in order to ensure better NVH performance at higher charge levels, a preset power demand difference P is introduced based on the vehicle's required power. socoffset This suppresses the power output of the fuel cell, thereby ensuring NVH performance. Meanwhile, P in the formula... bat_chg_max -P offset This feature can limit the requested power to less than the maximum charging power of the power battery to prevent overcharging.

[0065] When the SOC of the power battery is within the third operating range, the requested power is calculated using the following formula:

[0066] P req =P bat_chg_max *P′ scofac

[0067] In the formula, P req Indicates the requested power; P bat_chg_max This indicates the maximum charging power of the power battery; P′ scofac This represents the third power correction parameter (i.e., the power correction parameter for the third operating range), and P′ scofac =0;

[0068] According to the third power correction parameter P′ scofac The requested power is 0, and the fuel cell is controlled to be in standby mode.

[0069] When the SOC of the power battery is in the third operating range, the SOC is close to the upper limit of the target SOC range. When the power battery cannot meet the power demand of the vehicle (at which point the SOC is very likely to drop to the second operating range), the fuel cell can respond quickly because it is in standby mode.

[0070] When the SOC of the power battery is greater than the upper limit of the target SOC range, the requested power to the fuel cell is 0, the fuel cell stops operating, and the power battery meets the power requirements of the whole vehicle.

[0071] When the SOC of the power battery is greater than the upper limit of the target SOC range, the power battery has sufficient charge, the fuel cell exits operation, and enters pure electric mode. The power battery then meets the power demand of the vehicle, improving NVH performance. At the same time, without the fuel cell to supplement power, the SOC can drop to the target SOC range as quickly as possible.

[0072] Example 2

[0073] In this embodiment, the power request method for hybrid electric vehicles in Embodiment 1 is configured in a computer-readable storage medium. The computer-readable storage medium used in this embodiment is a VCU (Vehicle Control Unit). The VCU obtains the SOC of the vehicle's power battery and the vehicle's required power in real time through vehicle CAN network communication, calculates the requested power according to the power request method for hybrid electric vehicles in this embodiment, and sends a power request to the fuel cell based on the requested power.

[0074] This embodiment also provides a vehicle, including the computer-readable storage medium of this embodiment, namely the vehicle controller.

[0075] Example 3

[0076] This embodiment takes into account that the optimal discharge power of the fuel cell changes with the chemical reaction state of the fuel cell itself, and the maximum charging power of the power battery changes with the state of charge (SOC) and temperature. The difference between this embodiment and Embodiment 1 is that this embodiment continuously updates the maximum charging power of the power battery and the optimal discharge power of the fuel cell.

[0077] This embodiment obtains the maximum charging power of the power battery and the optimal discharge power of the fuel cell under different conditions through experimental testing, calibrates the maximum charging power of the power battery under different SOC and temperature, and calibrates the optimal discharge power of the fuel cell under different hydrogen pressure and temperature, forming a corresponding mapping table for updating by looking up the table.

[0078] Example 4

[0079] In this embodiment, the power request method for hybrid electric vehicles in Embodiment 3 is configured in a computer-readable storage medium. The computer-readable storage medium used in this embodiment is a VCU (Vehicle Control Unit). The VCU obtains the vehicle's power battery SOC (State of Change) and required power in real time through vehicle CAN network communication, calculates the requested power according to the power request method for hybrid electric vehicles in this embodiment, and sends a power request to the fuel cell based on the requested power.

[0080] This embodiment also provides a vehicle, including the computer-readable storage medium of this embodiment, namely the vehicle controller.

[0081] In summary, the present invention can quickly adjust the SOC of the power battery back to the target SOC range. When the SOC of the power battery is within the target SOC range, regardless of how the power demand of the vehicle changes, the present invention can maintain the SOC of the power battery within the target SOC range, improve NVH performance, and avoid overcharging.

[0082] Example 5

[0083] This embodiment divides the target SOC range of 30% to 80% into two working intervals: the first working interval is 30% ≤ SOC ≤ 60%, and the second working interval is 60% < SOC ≤ 80%.

[0084] When the SOC of the power battery is within the first operating range of the target SOC range, the requested power is calculated according to the following formula:

[0085] P req =min(P bat_chg_max *P scofac P bat_chg_max -P offset )

[0086] In the formula, P req Indicates the requested power; P bat_chg_max P represents the maximum charging power of the power battery. scofac This indicates the first power correction parameter determined based on the SOC, 0 <P scofac ≤1; P offsetThis indicates the preset difference in charging power.

[0087] When the SOC of the power battery is within the first operating range, the primary goal is to increase the SOC due to its low SOC level. Therefore, the calculation formula is based on the maximum charging power of the power battery, and then adjusted using the first power correction parameter P. scofac To adjust the requested power based on the SOC, and at the same time, P in the formula bat_chg_max -P offset This feature can limit the requested power to less than the maximum charging power of the power battery to prevent overcharging.

[0088] The first power correction parameter P scofac Obtained by looking up a table, as shown in Table 3:

[0089] Table 3 (SOC - First Power Correction Parameter P) scofac Mapping table)

[0090] <![CDATA[P scofac ]]> 1 1 1 1 1 1 0.8 0.6 0.4 0.3 0.2 0.1

[0091] Table 3 lists the first power correction parameter P corresponding to the discrete values ​​of SOC. scofac For SOCs not listed in the table, the corresponding first power correction parameter P can be obtained through interpolation. scofac In this embodiment, the mean interpolation method is used. For example, if the SOC is 55%, then 0.2 and 0.1 are taken respectively for 50% and 60%, and the average value of the two is calculated to be 0.15. Therefore, the first power correction parameter P when the SOC is 55% is... scofac The value is 0.15. Calculate the first power correction parameter P when the SOC is 53%. scofac At that time, the first power correction parameter P can be used according to the SOC values ​​of 50% and 55%, respectively. scofac To perform mean interpolation.

[0092] When the SOC of the power battery is within the second operating range of the target SOC range, the requested power is calculated according to the following formula:

[0093] P req =min(P Dem +P socoffset P bat_chg_max -P offset )

[0094] In the formula, P req Indicates the requested power; P bat_chg_max P represents the maximum charging power of the power battery. Dem P represents the total power required by the vehicle. socoffset This indicates the second power correction parameter determined based on the SOC, P socoffset ≤0; P offsetThis represents the preset difference in charging power. In this embodiment, the preset difference in charging power is P. offset The value range is 1 to 3, and the preset difference in charging power is P. offset The unit is the same as the unit of the maximum charging power of the power battery.

[0095] The second power correction parameter P socoffset Obtained by looking up a table, as shown in Table 4:

[0096] Table 4 (SOC-P) socoffset Mapping table)

[0097]

[0098] Table 4 lists some of the second power correction parameters P corresponding to the discrete values ​​of SOC. socoffset For SOCs not listed in the table, the corresponding second power correction parameter P can be obtained through interpolation. socoffset In this embodiment, the mean interpolation method is used. For example, if the SOC is 75%, then -20 and -30 are taken respectively for 70% and 80%, and the average value of the two is calculated to be -25. Therefore, the second power correction parameter P when the SOC is 75% is... socoffset It is -25.

[0099] When the SOC of the power battery is within the second operating range, the SOC is relatively high. In order to ensure good NVH performance at higher charge levels, a second power correction parameter P is introduced based on the vehicle's required power. socoffset This can suppress the power output of the fuel cell, thereby ensuring NVH performance. Meanwhile, P in the formula... bat_chg_max -P offset This feature can limit the requested power to less than the maximum charging power of the power battery to prevent overcharging.

[0100] Compared to Example 1, which stabilizes the SOC within the target SOC range, the second power correction parameter P in this example... socoffset This not only suppresses the power output of the fuel cell but also maintains the State of Charge (SOC) at the equilibrium point more precisely, while meeting the regulatory requirements for the balance test (equilibrium point SOC of at least 60%). Specifically, in this embodiment, the equilibrium point SOC is 66%. When the SOC is less than 66%, the second power correction parameter P... socoffset When the SOC is greater than 0, the additional power beyond the vehicle's required power is used to charge the battery to improve the State of Charge (SOC) and return to the equilibrium point. When the SOC is greater than 66%, the second power correction parameter P... socoffset If the value is less than 0, the requested power is reduced based on the vehicle's required power. The reduced power is supplied to the motor by the power battery. As the power battery's energy is consumed, the SOC is reduced to the equilibrium point SOC.

[0101] The above technical solutions are merely specific embodiments of the present invention. For those skilled in the art, based on the principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the technical solutions described in the above specific embodiments of the present invention. Therefore, the foregoing descriptions are only preferred and not restrictive.

Claims

1. A power request method for a hybrid electric vehicle, characterized in that, It includes the following steps: Determine the target SOC range of the power battery, divide the target SOC range into at least two working intervals, and set power correction parameters for each working interval; When the SOC of the power battery is within the target SOC range, obtain the requested power sent to the fuel cell according to the power correction parameter of the working interval where the SOC is located; Set four-level thresholds within the target SOC range, namely: SOC1, SOC2, SOC3, SOC4, and SOC1 < SOC2 < SOC3 < SOC4, where SOC1 and SOC4 are the lower limit value and the upper limit value of the target SOC range respectively; divide three working intervals according to the four-level thresholds: SOC1~SOC2 is the first working interval, SOC2~SOC3 is the second working interval, and SOC3~SOC4 is the third working interval; When the SOC of the power battery is within the first working interval, calculate the requested power according to the following formula: In the formula, Indicates the requested power; This indicates the maximum charging power of the power battery; This represents the first power correction parameter. ; This indicates the preset difference in charging power; When the SOC of the power battery is within the second working interval, calculate the requested power according to the following formula: In the formula, Indicates the requested power; This indicates the maximum charging power of the power battery; Indicates the required power output for the entire vehicle; This indicates the second power correction parameter; This indicates the preset difference in charging power; When the SOC of the power battery is within the third working interval, calculate the requested power according to the following formula: In the formula, Indicates the requested power; This indicates the maximum charging power of the power battery; This represents the third power correction parameter, and ; According to the third power correction parameter The requested power is 0, and the fuel cell is controlled to be in standby mode.

2. The power request method for a hybrid electric vehicle according to claim 1, characterized in that, The target SOC range of the power battery refers to the SOC range with high discharge performance, and high discharge performance means that the maximum discharge power reaches more than 50kW within 2s.

3. The power request method for a hybrid electric vehicle according to claim 1, characterized in that, The preset difference in charging power The value range is 1~3kW.

4. The power request method for a hybrid electric vehicle according to claim 1, characterized in that, When the SOC of the power battery is less than the lower limit of the target SOC range, the optimal discharge power of the fuel cell is compared. Maximum charging power of the power battery The optimal discharge power This refers to the maximum discharge power at the maximum conversion efficiency, where maximum conversion efficiency is the maximum efficiency by which the fuel cell converts chemical energy into electrical energy. The minimum of the two values ​​is taken. If the vehicle's power requirement... If the value is greater than the specified value, then the maximum charging power of the power battery will be used. As a request for power to be sent to the fuel cell If the vehicle requires power If the value is less than or equal to the smaller value, then the smaller value is used as the requested power. .

5. The power request method for a hybrid electric vehicle according to claim 1, characterized in that, When the SOC of the power battery is greater than the upper limit value of the target SOC range, the requested power sent to the fuel cell is 0, and the fuel cell stops operating.

6. The power request method for a hybrid electric vehicle according to claim 2, characterized in that, The target SOC range is 30%~80%, the first working interval is 30%≤SOC≤50%, the second working interval is 50%<SOC≤70%, and the third working interval is 70% <SOC ≤80%.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one computer-executable program, and when the at least one program is executed by the computer, the computer executes the steps in the power request method of the hybrid vehicle according to any one of claims 1 to 6.

8. A vehicle, characterized in that: It includes the computer-readable storage medium as claimed in claim 7.

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