Energy control method and device for hydrogen fuel cell hybrid bus

Abstract

The present invention discloses an energy control method and device for a hydrogen fuel cell hybrid bus. The method includes: determining the SOC ranges of the power battery according to the vehicle simulation model; setting a fixed target power or target power range corresponding to each SOC range; if the current SOC range corresponds to the target power range, a staged power following control strategy is executed according to the dynamic power demand of the vehicle, the power prediction model and the variable load capacity of the stack. The technical solution of the present invention, by formulating an energy control strategy of partition control and staged power following, satisfies the dynamic power demand of the vehicle while taking into account the variable load capacity of the fuel cell, thereby ensuring the power demand of the vehicle and the durability of the fuel cell.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of fuel cell energy control, and in particular to an energy control method and device for a hydrogen fuel cell hybrid bus. Background Art

[0002] Limited by the inherent characteristics and development status of fuel cells, the power system of hydrogen fuel hybrid buses currently usually adopts a method of matching hydrogen fuel cells with power batteries to meet the power requirements of the vehicle and brake energy recovery. On the basis of ensuring the power of the vehicle, the power output of the fuel cell and the power battery is reasonably allocated, and the durability of the power system and the economy of the vehicle are taken into account, which is the core of the vehicle energy management control strategy.

[0003] The existing mainstream logic threshold control strategy based on lithium battery SOC is to control the fuel cell to output at several fixed power points. Although this can ensure that the fuel cell works at the high efficiency point, it is limited by the relatively fixed power output mode. This control strategy cannot meet the power requirements of the vehicle under complex working conditions. If it is not fully verified, it is easy to cause problems such as increased fuel cell startup and shutdown frequency, large lithium battery charge and discharge capacity, and large SOC fluctuation range. The full-power follower energy control strategy can appropriately reduce the startup and shutdown frequency and lithium battery charge and discharge capacity, but the continuous large power jump poses a greater challenge to the variable load capacity and durability of the fuel cell. Summary of the invention

[0004] In order to solve the problem of excessive load variation of hydrogen fuel cells under a single power mode and a full power following strategy under the traditional SOC logic threshold control strategy, the present invention provides an energy control method and device for a hydrogen fuel cell hybrid bus. By formulating an energy control strategy of zone control and staged power following, the dynamic power demand of the entire vehicle is met while taking into account the load variation capability of the stack, thereby ensuring a relatively steady-state change in the output power of the fuel cell.

[0005] In a first aspect, an embodiment of the present invention provides an energy control method for a hydrogen fuel cell hybrid bus, comprising:

[0006] S01: According to the vehicle simulation model, set the SOC range of the power battery;

[0007] S02: Setting a fixed target power or a target power range corresponding to each SOC interval range;

[0008] S03: If the current SOC interval corresponds to the target power range, a phased power following control strategy is executed according to the dynamic power demand of the vehicle, the vehicle demand power prediction model and the variable load capability of the battery stack.

[0009] Optionally, the method further includes:

[0010] S04: Evaluate the stability of the vehicle's SOC under long-term operation in actual operating conditions, and dynamically adjust the target power range and partition power following time corresponding to each SOC interval.

[0011] Optionally, the S01 includes:

[0012] The SOC from 0% to 100% is divided into six intervals: A, B, C, D, E, and F.

[0013] Optionally, the S02 includes:

[0014] When the SOC is in the A, E, and F intervals, the corresponding fixed target power is set respectively;

[0015] When the SOC is in the B, C, and D intervals, the corresponding target power ranges are set respectively.

[0016] Optionally, when the SOC is in intervals B, C, and D, the corresponding target power ranges are set respectively, including:

[0017] By selecting different net output power windows of the fuel cell in each interval, the SOC variation curves corresponding to different power intervals are obtained, and the power interval with the smallest SOC fluctuation range of the power battery under specific working conditions is determined as the target power range of each interval.

[0018] Optionally, the S03 includes:

[0019] The vehicle controller obtains the real-time power demand of the vehicle and the vehicle power demand prediction model predicts the vehicle power demand in the next set time period;

[0020] Determine the difference in the vehicle power requirements at the start and end of the set time period. If the difference in the power requirements is greater than or equal to the first preset difference, the target power increases linearly within the target power range according to the variable load capacity of the fuel cell stack. If the target power increases to the maximum value of the target power range and the SOC is still in this range, the maximum value of the target power range is outputted constantly until entering the next SOC range.

[0021] If the vehicle power requirement difference is greater than the second preset difference and less than the first preset difference, the target power is the average power of the last set time period;

[0022] If the vehicle power demand difference is less than or equal to the second preset difference, the target power is linearly reduced within the target power range according to the variable load capacity of the battery stack. If the target power is reduced to the minimum value of the target power range and the SOC is still in this range, the minimum value of the target power range is outputted constantly until the SOC range is exceeded.

[0023] The first preset difference is greater than the second preset difference;

[0024] When the interval to which the SOC belongs corresponds to a target power range, the initial target power of each interval is set to the average of the maximum power and the minimum power of the target power range of each interval.

[0025] Optionally, the S03 further includes:

[0026] If the interval to which the current SOC belongs corresponds to a fixed target power, the corresponding fixed target power is executed.

[0027] Optionally, the interval to which the SOC belongs is monitored in real time, and if it is detected that the interval to which the SOC belongs changes, the target power execution strategy is adjusted accordingly according to the interval to which the changed SOC belongs.

[0028] The second invention, an embodiment of the present invention also provides an energy control device for a hydrogen fuel cell hybrid bus, comprising:

[0029] The SOC interval setting module is used to set the SOC interval range of the power battery according to the vehicle simulation model;

[0030] A target power setting module is used to set a fixed target power or a target power range corresponding to each SOC interval range;

[0031] The vehicle power demand prediction module is used to predict the vehicle power demand in the next set time period;

[0032] The target power adjustment module is used to execute a staged power following control strategy based on the dynamic power demand of the whole vehicle, the vehicle demand power prediction model and the variable load capability of the battery stack if the current SOC belongs to the SOC interval corresponding to the target power range.

[0033] Beneficial effects of the present invention:

[0034] 1. The present invention develops the FC-B-Balance energy control strategy of partition control and step-by-step power following, combines the advantages and disadvantages of the SOC switch control strategy and the power following strategy, and can avoid large-scale power jumps of the fuel cell while achieving dynamic responsiveness to the power demand of the whole vehicle, taking into account the power of the whole vehicle and the durability of the fuel cell;

[0035] 2. The phased power following reduces the demand for the fuel cell load change rate, breaking through the bottleneck of the stack load change capacity and the number of load changes under the full power following strategy. The power battery can maintain a relatively stable SOC while playing the role of peak shaving and valley filling, extending the cycle life of the power battery and fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A flow chart of an energy control method for a hydrogen fuel cell hybrid bus provided by the present invention;

[0037] Figure 2 A schematic diagram of the SOC interval and target power setting provided by the present invention;

[0038] Figure 3 A flow chart of another energy control method for a hydrogen fuel cell hybrid bus provided by the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0040] Figure 1 A flow chart of an energy control method for a hydrogen fuel cell hybrid bus provided by an embodiment of the present invention specifically includes the following steps:

[0041] S01: According to the vehicle simulation model, the SOC ranges of the power battery are set.

[0042] In this embodiment, according to the actual operating conditions and power requirements of the hydrogen fuel hybrid bus, taking into account the capacity of the power battery and the power requirements of the whole vehicle, the power battery SOC is divided into six intervals of A, B, C, D, E, and F from 0% to 100%.

[0043] S02: Setting a fixed target power or a target power range corresponding to each SOC interval range.

[0044] In this embodiment, when the SOC is in the A, E, and F intervals, corresponding fixed target powers are set respectively; when the SOC is in the B, C, and D intervals, corresponding target power ranges are set respectively.

[0045] See also Figure 2 , the specific power allocation principle is:

[0046] 1. Set a larger fixed target power P in the A interval (low SOC interval) A , ensuring rapid replenishment of lithium battery power at low SOC;

[0047] 2. Set a smaller fixed target power P in the E interval (high SOC interval) E , to prevent the power battery from overcharging;

[0048] 3. In the F range, the fuel cell does not start or executes the automatic shutdown process;

[0049] 4.B, C, and D intervals perform phased power following. The target power range set for each interval should ensure the high efficiency output of the fuel cell as much as possible. The power ranges corresponding to each SOC interval are: B interval P Bmin -P Bmax , C interval P Cmin -P Bmin ,D interval P Dmin -P Cmin By selecting different net output power windows of the fuel cell in each interval, the SOC change curves corresponding to different power intervals are obtained, and the optimal power range of each interval with the smallest SOC fluctuation range of the power battery under specific working conditions is determined, and the optimal power range of each interval is set as the target power range of each interval.

[0050] S03: If the current SOC interval corresponds to the target power range, a phased power following control strategy is executed according to the dynamic power demand of the vehicle, the vehicle demand power prediction model and the variable load capability of the battery stack.

[0051] See also Figure 3 , if the current SOC belongs to the interval B, C, or D, the real-time required power of the vehicle is obtained through the vehicle controller, and the vehicle required power prediction model predicts the vehicle required power in the next set time period;

[0052] Determine the difference in the vehicle power requirements at the start and end of the set time period. If the difference in the power requirements is greater than or equal to the first preset difference, the target power increases linearly within the target power range according to the variable load capacity of the fuel cell stack. If the target power increases to the maximum value of the target power range and the SOC is still in this range, the maximum value of the target power range is outputted constantly until entering the next SOC range.

[0053] If the vehicle power requirement difference is greater than the second preset difference and less than the first preset difference, the target power is the average power of the last set time period;

[0054] If the vehicle power demand difference is less than or equal to the second preset difference, the target power is linearly reduced within the target power range according to the variable load capacity of the battery stack. If the target power is reduced to the minimum value of the target power range and the SOC is still in this range, the minimum value of the target power range is outputted constantly until the SOC range is exceeded.

[0055] The first preset difference is greater than the second preset difference;

[0056] When the interval to which the SOC belongs corresponds to a target power range, the initial target power of each interval is set to the average of the maximum power and the minimum power of the target power range of each interval.

[0057] In this embodiment, assuming that the first preset difference is 10kw and the second preset difference is -10kw, the above steps are specifically as follows:

[0058] The vehicle controller collects information such as vehicle speed, motor speed, accelerator pedal information, motor efficiency, etc. to obtain the vehicle's required power under real-time working conditions, P r =T*n / (9549*η)+P f , T is the motor torque, n is the motor speed, η is the motor efficiency, P f The vehicle controller evaluates the vehicle power demand in real time and can predict the next set time period T according to vehicle speed, traffic congestion, slope, etc. 0-n The power demand and real-time feedback, if T 0-n The difference in power required by the vehicle at the start and end points P n -P 0 ≥10kw, the target power increases linearly within the set range. 0-n The difference in power required by the vehicle at the start and end points -10kw<P n -P 0 <10kw, the target power will be executed as per the previous T 0-n Average power in a time period If T 0-n The difference in power required by the vehicle at the start and end points P n -P 0 ≤-10kw, the target power decreases linearly within the set interval. The initial target power of each interval of the staged power following is set as the average of the maximum power and the minimum power of the target power range. If the target power increases to the maximum value of the target power range and the SOC is still in this interval, the maximum value of the target power range is output continuously until entering the next SOC interval. If the target power decreases to the minimum value of the target power range and the SOC is still in this interval, the minimum value of the target power range is output continuously until jumping out of this SOC interval.

[0059] Among them, T 0-n This can be confirmed by preliminary simulation, for example, setting equidistant scattered points T in the time range of 0-5min 0 , T 1 ……T n , establish the vehicle power model of fuel cell and power battery, and determine the power following time value with the minimum power battery throughput under the set working conditions through simulation.

[0060] Furthermore, the S03 also includes: if the interval to which the current SOC belongs corresponds to a fixed target power, executing the corresponding fixed target power.

[0061] Based on the above embodiment, the method further includes: real-time monitoring of the interval to which the SOC belongs, and if it is detected that the interval to which the SOC belongs changes, adjusting the target power execution strategy accordingly according to the interval to which the changed SOC belongs.

[0062] Specifically, in the steps S02 and S03, when executing the partition control and staged power following control strategies, the SOC reduction hysteresis interval difference δ is calculated. sdown , if SOC n >SOC amax +δ sdown , the vehicle enters the B interval and performs phased power following until SOC < SOC amax , enter the low SOC range constant power operation mode, similarly, if the SOC n >SOC emin +δ sdown , the vehicle enters the E interval and executes the high SOC constant power operation mode until SOC<SOC emin , enter the D interval and execute the phased power following strategy.

[0063] In the implementation of the partition control and staged power following control strategy, the SOC increase hysteresis interval difference δ is calculated sup , if SOC n <SOC amax , execute the high constant power strategy in the low SOC range until the SOC n >SOC amax +δ sup When the partition power following strategy is executed, if SOC n >SOC emin , execute high SOC low constant power strategy until SOC n＜ SOC emin -δ sup When , the D interval partition power following strategy is executed.

[0064] Among them, SOC amax is the maximum SOC value of interval A, SOC emin is the minimum value of interval E.

[0065] S04: Evaluate the stability of the vehicle's SOC under long-term operation in actual operating conditions, and dynamically adjust the target power range and partition power following time corresponding to each SOC interval.

[0066] After completing S03, evaluate the stability of the vehicle's SOC under long-term operation in actual operating conditions. If the SOC value fluctuates greatly, the setting of the partition target power range and the partition power following time T can be further adjusted. n Selection.

[0067] Among them, the vehicle controller in this embodiment sets the energy control strategy between the partitions and the power following strategy in stages, and its control system includes: a real-time acquisition module to obtain the real-time vehicle demand power;

[0068] The vehicle demand power prediction module uses vehicle speed, traffic congestion, slope, etc. as parameters to predict the next T 0-n The vehicle power demand in the time period and calculate the difference;

[0069] The self-switching module switches the control strategy between different areas according to the SOC status of the vehicle.

[0070] Furthermore, the present invention also provides an energy control device for a hydrogen fuel cell hybrid bus, comprising:

[0071] The SOC interval setting module is used to set the SOC interval range of the power battery according to the vehicle simulation model;

[0072] A target power setting module is used to set a fixed target power or a target power range corresponding to each SOC interval range;

[0073] The target power adjustment module is used to execute a staged power following control strategy based on the dynamic power demand of the vehicle and the power prediction model combined with the variable load capability of the battery stack if the current SOC belongs to the SOC interval corresponding to the target power range.

[0074] The dynamic adjustment module is used to evaluate the stability of the SOC of the vehicle under long-term operation in actual operating conditions, and dynamically adjust the target power range and partition power following time corresponding to each SOC interval.

[0075] The SOC interval setting module is specifically used to divide the SOC from 0% to 100% into six intervals: A, B, C, D, E, and F.

[0076] The target power setting module is specifically used to: when the SOC is in the A, E, and F intervals, set the corresponding fixed target power respectively;

[0077] When the SOC is in the B, C, and D intervals, the corresponding optimal target power ranges matching different SOC intervals are set respectively.

[0078] Furthermore, when the SOC is in the B, C, and D intervals, the corresponding target power ranges are set respectively, including:

[0079] By selecting different net output power windows of the fuel cell in each interval, the SOC variation curves corresponding to different power intervals are obtained, and the power interval with the smallest SOC fluctuation range of the power battery under specific working conditions is determined as the target power range of each interval.

[0080] The target power adjustment module is specifically used for:

[0081] Obtain the real-time power demand of the vehicle through the vehicle controller and predict the power demand of the vehicle within the next set time period according to the vehicle power demand prediction module;

[0082] Determine the difference in the vehicle power requirements at the start and end of the set time period. If the difference in the power requirements is greater than or equal to the first preset difference, the target power increases linearly within the target power range according to the variable load capacity of the fuel cell stack. If the target power increases to the maximum value of the target power range and the SOC is still in this range, the maximum value of the target power range is outputted constantly until entering the next SOC range.

[0083] If the vehicle power requirement difference is greater than the second preset difference and less than the first preset difference, the target power is the average power of the last set time period;

[0084] If the vehicle power demand difference is less than or equal to the second preset difference, the target power is linearly reduced within the target power range according to the variable load capacity of the battery stack. If the target power is reduced to the minimum value of the target power range and the SOC is still in this range, the minimum value of the target power range is outputted constantly until the SOC range is exceeded.

[0085] The first preset difference is greater than the second preset difference;

[0086] When the interval to which the SOC belongs corresponds to a target power range, the initial target power of each interval is set to the average of the maximum power and the minimum power of the target power range of each interval.

[0087] If the interval to which the current SOC belongs corresponds to a fixed target power, the corresponding fixed target power is executed.

[0088] If it is monitored that the interval to which the SOC belongs changes, the target power execution strategy is adjusted accordingly according to the interval to which the changed SOC belongs.

[0089] An energy control device for a hydrogen fuel cell hybrid bus provided in an embodiment of the present invention can execute an energy control method for a hydrogen fuel cell hybrid bus provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0090] Example

[0091] In this embodiment, the rated power of the fuel cell system is 65kw, and the initial SOC of the power battery is 23%.

[0092] (1) Determine the SOC range of the power battery through simulation, with range A being 0%-25%, range E being 75%-85%, range F being 85%-100%, and ranges B, C, and D being 25%-40%, 40%-60%, and 60%-75%, respectively;

[0093] (2) Determine the target power range for each interval. The target power for interval A is 60kW, the target power for interval E is set to 15kW, and the target power for interval F is set to 0kW, that is, the fuel cell does not start or goes through the shutdown process. The B, C, and D intervals implement a phased energy following strategy, and set the target power ranges to 54kw-40kw, 40kw-30kw, and 30kw-20kw respectively;

[0094] (3) The initial SOC is 23%, and the target power is 60kW. As the fuel cell continues to output power to the power battery, after the SOC rises to 25%, it enters the B interval to implement the phased power following strategy. The initial target power is 47kW, and the target power range is 54kW-40kW.

[0095] (4) The vehicle controller collects information such as vehicle speed, motor speed, accelerator pedal information, and motor efficiency to obtain the vehicle power demand under real-time working conditions. The vehicle power demand prediction module predicts the next preset T in real time based on parameters such as vehicle speed, traffic congestion, and slope. 0-n The vehicle power demand at each stage;

[0096] (5) If the difference in vehicle power demand between the start and end of the forecast period is P n -P 0 ≥10kw, the target power increases linearly in the range of 54-40kw according to the variable load capacity of the battery stack. If the difference in the starting and ending vehicle power requirements during the forecast period is -10kw<P n -P 0 <10kw, the target power will be executed as per the previous T 0-n Average power in a time period If the difference in vehicle power demand between the start and end of the forecast period is P n -P 0 ≤-10kw, the target power decreases linearly within the range of 54-40kw according to the variable load capacity of the fuel cell stack. If the target power increases to 54kw and the SOC is still within this range, the fuel cell will execute a constant target power output of 54kw until entering the next range. If the target power decreases to 40kw and the SOC is still within this range, the fuel cell will execute a constant target power output of 40kw until jumping out of this range.

[0097] (6) Continuously monitor the changes in the SOC of the power battery. If the SOC is maintained in the range of 25%-40%, the target power is executed according to step 5. If the SOC drops to the critical point of 25%, it enters the A range and the target power is 60kw constant power. If the SOC rises to 40%, it enters the C range to implement the power following strategy. The initial target power is 35kw and the target power range is 40kw-30kw.

[0098] (7) The target power setting rule is the same as step (5). If the difference between the starting and ending vehicle power requirements during the forecast period is P n -P 0 ≥10kw, the target power will increase linearly in the range of 40kw-30kw according to the variable load capacity of the fuel cell stack.

[0099] -The difference in power required by the vehicle is -10kw<P n -P 0 <10kw, the target power will be executed as per the previous T 0-n The average power P of the time period, if the difference in the vehicle power demand at the start and end of the forecast time period is P n -P 0 ≤-10kw, the target power decreases linearly within the range of 40kw-30kw according to the variable load capacity of the fuel cell stack. If the target power increases to 40kw and the SOC is still within this range, the fuel cell will execute a constant target power output of 40kw until entering the next range. If the target power decreases to 30kw and the SOC is still within this range, the fuel cell will execute a constant target power output of 30kw until jumping out of this range.

[0100] (8) When SOC increases or decreases to the adjacent interval, the target power setting rules are the same as above, T 0-n It can be confirmed through preliminary simulation that equidistant scattered points T are set within the time range of 0-5min 0 , T 1 ……T n , establish the vehicle power model of fuel cell and power battery, and determine the power following time value with the minimum power battery throughput under the set working conditions through simulation;

[0101] (9) Run according to the rules of steps 4-8;

[0102] (10) If the SOC rises to 75%, the target power is 15 kW, and the fuel cell is shut down when the SOC is greater than 85%.

[0103] In summary, the present invention takes into account the advantages and disadvantages of the SOC switch control strategy and the power following strategy. By developing the FC-B-Balance energy control strategy of partition control and staged power following, the required power of the whole vehicle is dynamically acquired and the required power of the next stage can be predicted in real time according to the vehicle required power prediction module. While achieving dynamic responsiveness to the power demand of the whole vehicle, large-scale power jumps of the fuel cell can be avoided, and the power of the whole vehicle and the durability of the fuel cell are taken into account. The staged power following reduces the demand for the load change rate of the fuel cell, breaking through the bottleneck of the load change capacity and the number of load changes of the stack under the full power following strategy. The power battery can maintain a relatively stable SOC while playing the role of peak shaving and valley filling, thereby extending the cycle life of the power battery and the fuel cell.

[0104] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An energy control method for a hydrogen fuel cell hybrid bus, characterized in that: include: S01: According to the vehicle simulation model, set the SOC range of the power battery; S02: Setting a fixed target power or a target power range corresponding to each SOC interval range; S03: If the current SOC interval corresponds to the target power range, a staged power following control strategy is executed according to the dynamic power demand of the vehicle, the vehicle demand power prediction model and the variable load capability of the battery stack; The S01 includes: dividing the SOC from 0% to 100% into six intervals of A, B, C, D, E, and F; The S02 includes: when the SOC is in the A, E, and F intervals, respectively setting corresponding fixed target powers; when the SOC is in the B, C, and D intervals, respectively setting corresponding target power ranges; The S03 includes: The vehicle controller obtains the real-time power demand of the vehicle and the vehicle power demand prediction model predicts the vehicle power demand in the next set time period; Determine the difference in the vehicle power requirements at the start and end of the set time period. If the difference in the power requirements is greater than or equal to the first preset difference, the target power increases linearly within the target power range according to the variable load capacity of the fuel cell stack. If the target power increases to the maximum value of the target power range and the SOC is still in this range, the maximum value of the target power range is outputted constantly until entering the next SOC range. If the vehicle power requirement difference is greater than the second preset difference and less than the first preset difference, the target power is the average power of the last set time period; If the vehicle power demand difference is less than or equal to the second preset difference, the target power is linearly reduced within the target power range according to the variable load capacity of the battery stack. If the target power is reduced to the minimum value of the target power range and the SOC is still in this range, the minimum value of the target power range is outputted constantly until the SOC range is exceeded. The first preset difference is greater than the second preset difference; When the interval to which the SOC belongs corresponds to a target power range, the initial target power of each interval is set to the average of the maximum power and the minimum power of the target power range of each interval.

2. The method according to claim 1, characterized in that Also includes: S04: Evaluate the stability of the vehicle's SOC under long-term operation in actual operating conditions, and dynamically adjust each SOC interval The corresponding target power range and partition power follow time.

3. The method according to claim 1, characterized in that: When the SOC is in the B, C, and D ranges, the corresponding target power ranges are set, including: By selecting different net output power windows of the fuel cell in each interval, the SOC variation curves corresponding to different power intervals are obtained, and the power interval with the smallest SOC fluctuation range of the power battery under specific working conditions is determined as the target power range of each interval.

4. The method according to claim 1, characterized in that: The S03 further includes: If the interval to which the current SOC belongs corresponds to a fixed target power, the corresponding fixed target power is executed.

5. The method according to claim 1, characterized in that The interval to which the SOC belongs is monitored in real time. If a change is detected in the interval to which the SOC belongs, the target power execution strategy is adjusted accordingly according to the interval to which the changed SOC belongs.

6. An energy control device for a hydrogen fuel cell hybrid bus, characterized in that: include: The SOC interval setting module is used to set the SOC interval range of the power battery according to the vehicle simulation model; A target power setting module is used to set a fixed target power or a target power range corresponding to each SOC interval range; The vehicle power demand prediction module is used to predict the vehicle power demand in the next set time period; The target power adjustment module is used to execute a staged power following control strategy according to the dynamic power demand of the vehicle, the vehicle demand power prediction module and the variable load capability of the battery stack if the current SOC belongs to the SOC interval corresponding to the target power range; The SOC interval setting module is specifically used to divide the SOC from 0% to 100% into six intervals: A, B, C, D, E, and F; The target power setting module is specifically used to: when the SOC is in the A, E, and F intervals, set the corresponding fixed target power respectively; The target power adjustment module is specifically used for: The vehicle controller obtains the real-time power demand of the vehicle and the vehicle power demand prediction model predicts the vehicle power demand in the next set time period; Determine the difference in the vehicle power requirements at the start and end of the set time period. If the difference in the power requirements is greater than or equal to the first preset difference, the target power increases linearly within the target power range according to the variable load capacity of the fuel cell stack. If the target power increases to the maximum value of the target power range and the SOC is still in this range, the maximum value of the target power range is outputted constantly until entering the next SOC range. If the vehicle power requirement difference is greater than the second preset difference and less than the first preset difference, the target power is the average power of the last set time period; If the vehicle power demand difference is less than or equal to the second preset difference, the target power is linearly reduced within the target power range according to the variable load capacity of the battery stack. If the target power is reduced to the minimum value of the target power range and the SOC is still in this range, the minimum value of the target power range is outputted constantly until the SOC range is exceeded. The first preset difference is greater than the second preset difference; When the interval to which the SOC belongs corresponds to a target power range, the initial target power of each interval is set to the average of the maximum power and the minimum power of the target power range of each interval.

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