阅读说明：本技术 燃料电池多能源控制方法及装置、车辆 (Fuel cell multi-energy control method and device and vehicle ) 是由 李洪涛 刘俊辉 于 2021-07-23 设计创作，主要内容包括：本发明公开了燃料电池多能源控制方法及装置、车辆,在燃料电池功率跟随开关机控制策略下,对燃料电池进行开关机控制,并确定分流策略对所述整车需求功率进行两级功率分流,确定燃料电池与蓄电池、超级电容的功率分配后,基于复合逻辑门限,实现蓄电池与超级电容之间最优功率分流,实现复合电源系统的最优能量管理。解决了复合能源耦合度高,控制策略复杂的问题,使燃料电池在不同运行工况下平稳运行,延长了燃料电池寿命,能够充分发挥燃料电池+动力电池+超级电容车型优势。(The invention discloses a fuel cell multi-energy control method, a fuel cell multi-energy control device and a vehicle. The problems of high coupling degree of composite energy and complex control strategy are solved, the fuel cell can stably run under different running conditions, the service life of the fuel cell is prolonged, and the advantages of the fuel cell, the power cell and the super capacitor can be fully exerted.)

1. A fuel cell multi-energy control method, characterized in that the method comprises:

the method comprises the steps that on-off control of a fuel cell is achieved based on preset on-off conditions of the fuel cell;

if the fuel cell is in a starting state, determining a shunting strategy based on the power required by the whole vehicle, the power of the fuel cell and the power provided by the composite energy source; the hybrid energy source comprises: a power battery and a super capacitor;

carrying out power splitting on the required power of the whole vehicle according to the splitting strategy; the shunting strategy comprises two stages of power shunting, wherein the required power of the whole vehicle is subjected to primary power shunting through the power provided by the fuel cell, and the power distribution of the power battery and the super capacitor is performed through composite energy logic threshold filtering control to complete secondary power shunting; the priority of the primary power split is higher than the priority of the secondary power split.

2. The method according to claim 1, wherein the implementing the on/off control of the fuel cell based on the preset on/off condition of the fuel cell specifically comprises one of the following:

when the SOC of the super capacitor and the SOC of the power battery are both smaller than the lowest limit value in the respectively specified optimal SOC interval, the fuel battery is started to charge the composite energy source, and simultaneously, the power output is independently provided for the whole vehicle;

when the SOC of the super capacitor and the SOC of the power battery are both larger than or equal to the maximum limit value in the respectively specified optimal SOC interval, the fuel battery is shut down;

when the SOC of the super capacitor and/or the SOC of the power battery are in the respectively specified optimal SOC interval, determining the on-off state of the fuel battery according to the on-off condition of the fuel battery at the previous moment;

when the required power of the whole vehicle is larger than the maximum power which can be provided by the composite energy source, the fuel cell is started;

and if the limited minimum power when the fuel cell is started is the minimum power when the fuel cell works in the high-efficiency power area, starting the fuel cell.

3. The method according to claim 2, wherein when the super capacitor SOC and the power battery SOC are both less than the lowest limit value in the respective specified optimal SOC intervals, the fuel cell is powered on to charge the hybrid energy source, and specifically comprises:

determining a first charging power of the fuel cell according to a first charging power calculation formula; charging a power battery in the compound energy source according to the first charging power; and/or

Determining a second charging power of the fuel cell according to a second charging power calculation formula; and charging the super capacitor in the composite energy source according to the second charging power.

4. The method of claim 3,

the first charging power formula is as follows:wherein, P_chgThe charging power of the fuel cell is adopted, the SOC is the current residual charge of the power cell, cs _ hi _ SOC is the maximum limit value of the SOC of the power cell, and cs _ lo _ SOC is the minimum limit value of the SOC of the power cell;

the second charging power formula is as follows:the SOC ' is the current remaining charge of the super capacitor, cs _ hi _ SOC ' is the maximum limit value of the super capacitor SOC, and cs _ lo _ SOC ' is the minimum limit value of the super capacitor SOC.

5. The method according to claim 2, wherein if the fuel cell is in a power-on state, determining a shunting strategy based on the power demanded by the entire vehicle, the power of the fuel cell, and the power provided by the hybrid energy source specifically comprises:

and if the fuel cell is in a starting state, the super capacitor SOC and the power battery SOC are between the respective specified limit values and are in a discharging state, and a shunting strategy is determined based on the required power of the whole vehicle, the power of the fuel cell and the power provided by the composite energy source.

6. The method of claim 1, wherein the power demanded by the entire vehicle is subjected to primary power splitting by the power provided by the fuel cell, and the power of the power battery and the super capacitor is distributed by the composite energy resource logic threshold filtering control, so as to complete secondary power splitting, specifically comprising:

if the required power of the whole vehicle is smaller than the maximum power of the fuel cell, performing primary power shunt by taking the fuel cell as a discharging main body, and when the variable load occurs, performing power distribution and discharging of the power cell and the super capacitor through composite energy source logic threshold filtering control to be used as secondary shunt to fill the variable load;

and if the required power of the whole vehicle is more than or equal to the maximum power of the fuel cell, performing primary power distribution according to the maximum power discharge of the fuel cell, performing power distribution and discharge of the power cell and the super capacitor through composite energy logical threshold filtering control, and completing secondary power distribution.

7. The method according to claim 6, wherein the power distribution and discharging of the power battery and the super capacitor is performed through composite energy source logic threshold filtering control, and specifically comprises:

when the SOC of the super capacitor is smaller than the lowest limit value of the logic threshold, the power battery discharges, and the super capacitor does not discharge;

when the SOC of the super capacitor is in a logic threshold, the super capacitor and the power battery are both discharged, and the discharge power of the power battery is slowed down through filtering control.

8. The method of claim 1, wherein after the power splitting of the overall vehicle required power according to the splitting strategy, the method further comprises:

when regenerative braking is carried out, the super capacitor and the power battery are charged, and the charging power of the power battery is slowed down through filtering control.

9. A control apparatus for a fuel cell multi-energy power system, comprising:

the startup and shutdown control module is used for realizing startup and shutdown control of the fuel cell based on the preset startup and shutdown conditions of the fuel cell;

the determining module is used for determining a shunting strategy based on the power required by the whole vehicle, the power of the fuel cell and the power provided by the composite energy source if the fuel cell is in a starting state; the hybrid energy source comprises: a power battery and a super capacitor;

the power distribution module is used for carrying out power distribution on the required power of the whole vehicle according to the distribution strategy; the shunting strategy comprises two-stage power shunting, wherein the required power of the whole vehicle is subjected to primary power shunting through the power provided by the fuel cell, and the power distribution of the power battery and the super capacitor is performed through composite energy logic threshold filtering control to complete secondary power shunting; the priority of the primary power split is higher than the priority of the secondary power split.

10. A vehicle, characterized by comprising: a fuel cell multi-energy control method as claimed in any one of claims 1 to 8.

Technical Field

The application relates to the technical field of vehicles, in particular to a fuel cell multi-energy control method and device and a vehicle.

Background

The problems of environmental pollution, energy crisis and the like have become major challenges facing mankind at present, and with the continuous development of new energy technology, hydrogen energy gradually becomes a hot spot of research and development of various countries by virtue of the advantages of cleanness, no pollution, high conversion efficiency, high energy density and the like.

The traditional energy storage scheme of the single-power source or double-power source fuel cell automobile system is relatively simple to control, but is difficult to consider factors such as service life, economy and the like. The fuel cell-storage battery-super capacitor composite power supply system has good power density and energy density, can fully exert the advantages of each power supply, improves the dynamic property and the economical property required by daily running of vehicles, and gradually becomes the development trend of fuel cell automobiles.

However, complex coupling relations exist among the composite power supply systems, the composite power supply systems have multiple working modes and high control freedom, and if the composite power supply energy management method is not reasonable and efficient enough, optimal power distribution among the power supplies is difficult to realize and system advantages are exerted.

Disclosure of Invention

The invention provides a fuel cell multi-energy control method, a fuel cell multi-energy control device and a vehicle, and aims to solve or partially solve the technical problem that optimal power split between power supplies is difficult to realize.

In order to solve the technical problem, the invention provides a multi-energy control method for a fuel cell, which comprises the following steps:

the method comprises the steps that on-off control of a fuel cell is achieved based on preset on-off conditions of the fuel cell;

if the fuel cell is in a starting state, determining a shunting strategy based on the power required by the whole vehicle, the power of the fuel cell and the power provided by the composite energy source; the hybrid energy source comprises: a power battery and a super capacitor;

carrying out power splitting on the required power of the whole vehicle according to the splitting strategy; the shunting strategy comprises two stages of power shunting, wherein the required power of the whole vehicle is subjected to primary power shunting through the power provided by the fuel cell, and the power distribution of the power battery and the super capacitor is performed through composite energy logic threshold filtering control to complete secondary power shunting; the priority of the primary power split is higher than the priority of the secondary power split.

Preferably, the implementing of the on/off control of the fuel cell based on the preset on/off condition of the fuel cell specifically includes one of the following:

when the SOC of the super capacitor and the SOC of the power battery are both smaller than the lowest limit value in the respectively specified optimal SOC interval, the fuel battery is started to charge the composite energy source, and simultaneously, the power output is independently provided for the whole vehicle;

when the SOC of the super capacitor and the SOC of the power battery are both larger than or equal to the maximum limit value in the respectively specified optimal SOC interval, the fuel battery is shut down;

when the SOC of the super capacitor and/or the SOC of the power battery are in the respectively specified optimal SOC interval, determining the on-off state of the fuel battery according to the on-off condition of the fuel battery at the previous moment;

when the required power of the whole vehicle is larger than the maximum power which can be provided by the composite energy source, the fuel cell is started;

and if the limited minimum power when the fuel cell is started is the minimum power when the fuel cell works in the high-efficiency power area, starting the fuel cell.

Preferably, when both the SOC of the super capacitor and the SOC of the power battery are smaller than the minimum limit value in the respective specified optimal SOC interval, the fuel battery is started to charge the hybrid energy source, specifically including:

determining a first charging power of the fuel cell according to a first charging power calculation formula; charging a power battery in the compound energy source according to the first charging power; and/or

Determining a second charging power of the fuel cell according to a second charging power calculation formula; and charging the super capacitor in the composite energy source according to the second charging power.

Preferably, the first charging power formula is as follows:wherein, P_chgThe charging power of the fuel cell is adopted, the SOC is the current residual charge of the power cell, cs _ hi _ SOC is the maximum limit value of the SOC of the power cell, and cs _ lo _ SOC is the minimum limit value of the SOC of the power cell;

the second charging power formula is as follows:the SOC ' is the current remaining charge of the super capacitor, cs _ hi _ SOC ' is the maximum limit value of the super capacitor SOC, and cs _ lo _ SOC ' is the minimum limit value of the super capacitor SOC.

Preferably, if the fuel cell is in the power-on state, the determining the shunting strategy based on the power required by the entire vehicle, the power of the fuel cell and the power provided by the composite energy source specifically includes:

and if the fuel cell is in a starting state, the super capacitor SOC and the power battery SOC are between the respective specified limit values and are in a discharging state, and a shunting strategy is determined based on the required power of the whole vehicle, the power of the fuel cell and the power provided by the composite energy source.

Preferably, the power demanded by the whole vehicle is subjected to primary power splitting by the power provided by the fuel cell, and the power distribution of the power cell and the super capacitor is performed by the composite energy logical threshold filtering control, so as to complete secondary power splitting, and specifically comprises:

if the required power of the whole vehicle is smaller than the maximum power of the fuel cell, performing primary power shunt by taking the fuel cell as a discharging main body, and when the variable load occurs, performing power distribution and discharging of the power cell and the super capacitor through composite energy source logic threshold filtering control to be used as secondary shunt to fill the variable load;

and if the required power of the whole vehicle is more than or equal to the maximum power of the fuel cell, performing primary power distribution according to the maximum power discharge of the fuel cell, performing power distribution and discharge of the power cell and the super capacitor through composite energy logical threshold filtering control, and completing secondary power distribution.

Preferably, the power distribution and the discharge of the power battery and the super capacitor are performed through the composite energy logic threshold filtering control, and specifically includes:

when the SOC of the super capacitor is smaller than the lowest limit value of the logic threshold, the power battery discharges, and the super capacitor does not discharge;

when the SOC of the super capacitor is in a logic threshold, the super capacitor and the power battery are both discharged, and the discharge power of the power battery is slowed down through filtering control.

Preferably, after the power splitting is performed on the power required by the entire vehicle according to the splitting strategy, the method further includes:

when regenerative braking is carried out, the super capacitor and the power battery are charged, and the charging power of the power battery is slowed down through filtering control.

The invention discloses a control device of a fuel cell multi-energy power system, which comprises:

the startup and shutdown control module is used for realizing startup and shutdown control of the fuel cell based on the preset startup and shutdown conditions of the fuel cell;

the determining module is used for determining a shunting strategy based on the power required by the whole vehicle, the power of the fuel cell and the power provided by the composite energy source if the fuel cell is in a starting state; the hybrid energy source comprises: a power battery and a super capacitor;

the power distribution module is used for carrying out power distribution on the required power of the whole vehicle according to the distribution strategy; the shunting strategy comprises two-stage power shunting, wherein the required power of the whole vehicle is subjected to primary power shunting through the power provided by the fuel cell, and the power distribution of the power battery and the super capacitor is performed through composite energy logic threshold filtering control to complete secondary power shunting; the priority of the primary power split is higher than the priority of the secondary power split.

Preferably, the on-off control module is specifically configured to one of:

when the SOC of the super capacitor and the SOC of the power battery are both smaller than the lowest limit value in the respectively specified optimal SOC interval, the fuel battery is started to charge the composite energy source, and simultaneously, the power output is independently provided for the whole vehicle;

when the SOC of the super capacitor and the SOC of the power battery are both larger than or equal to the maximum limit value in the respectively specified optimal SOC interval, the fuel battery is shut down;

when the SOC of the super capacitor and/or the SOC of the power battery are in the respectively specified optimal SOC interval, determining the on-off state of the fuel battery according to the on-off condition of the fuel battery at the previous moment;

when the required power of the whole vehicle is larger than the maximum power which can be provided by the composite energy source, the fuel cell is started;

and if the limited minimum power when the fuel cell is started is the minimum power when the fuel cell works in the high-efficiency power area, starting the fuel cell.

Preferably, the on-off control module is specifically configured to determine a first charging power of the fuel cell according to a first charging power calculation formula; charging a power battery in the compound energy source according to the first charging power; and/or

Determining a second charging power of the fuel cell according to a second charging power calculation formula; and charging the super capacitor in the composite energy source according to the second charging power.

Preferably, the first charging power formula is as follows:

wherein, P_chgThe charging power of the fuel cell is adopted, the SOC is the current residual charge of the power cell, cs _ hi _ SOC is the maximum limit value of the SOC of the power cell, and cs _ lo _ SOC is the minimum limit value of the SOC of the power cell;

the second charging power formula is as follows:the SOC ' is the current remaining charge of the super capacitor, cs _ hi _ SOC ' is the maximum limit value of the super capacitor SOC, and cs _ lo _ SOC ' is the minimum limit value of the super capacitor SOC.

Preferably, the determining module is configured to determine, if the fuel cell is in a power-on state, the super capacitor SOC and the power battery SOC are between respective specified limits and both are in a discharge state, and determine the shunting strategy based on the power required by the entire vehicle, the power of the fuel cell, and the power provided by the hybrid energy source.

Preferably, the power distribution module is configured to, if the power required by the entire vehicle is smaller than the maximum power of the fuel cell, perform primary power splitting by using the fuel cell as a discharging main body, and when a variable load occurs, perform power distribution and discharging of the power cell and the super capacitor through composite energy logic threshold filtering control, and perform secondary splitting to fill the variable load;

and if the required power of the whole vehicle is more than or equal to the maximum power of the fuel cell, performing primary power distribution according to the maximum power discharge of the fuel cell, performing power distribution and discharge of the power cell and the super capacitor through composite energy logical threshold filtering control, and completing secondary power distribution.

Preferably, the power distribution module is configured to discharge the power battery and not discharge the super capacitor when the SOC of the super capacitor is smaller than the lowest limit value of the logic threshold;

when the SOC of the super capacitor is in a logic threshold, the super capacitor and the power battery are both discharged, and the discharge power of the power battery is slowed down through filtering control.

Preferably, the apparatus further comprises:

and the charging module is used for charging the super capacitor and the power battery when regenerative braking is carried out, and the charging power of the power battery is controlled to be slowed down through filtering.

The invention discloses a vehicle, comprising: the fuel cell multi-energy control method is as described above.

Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:

the invention provides a fuel cell multi-energy control method, which is characterized in that under a fuel cell power following on-off control strategy, the on-off control is carried out on a fuel cell, a shunting strategy is determined to carry out two-stage power shunting on the required power of a whole vehicle, and after the power distribution of the fuel cell, a storage battery and a super capacitor is determined, the optimal power shunting between the storage battery and the super capacitor is realized based on a composite logic threshold, so that the optimal energy management of a composite power supply system is realized. The problems of high coupling degree of composite energy and complex control strategy are solved, the fuel cell can stably run under different running conditions, the service life of the fuel cell is prolonged, and the advantages of the fuel cell, the power cell and the super capacitor can be fully exerted.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 shows a flow chart of a fuel cell multi-energy control method according to an embodiment of the invention;

fig. 2 shows a schematic diagram of a fuel cell multi-energy source control apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.

The invention provides a fuel cell multi-energy control method, which is characterized in that under a fuel cell power following on-off control strategy, the on-off control is carried out on a fuel cell, a shunting strategy is determined to carry out two-stage power shunting on the required power of a whole vehicle, and after the power distribution of the fuel cell, a storage battery and a super capacitor is determined, the optimal power shunting between the storage battery and the super capacitor is realized based on a composite logic threshold, so that the optimal energy management of a composite power supply system is realized. The problems of high coupling degree of composite energy and complex control strategy are solved, the fuel cell can stably run under different running conditions, the service life of the fuel cell is prolonged, and the advantages of the fuel cell, the power cell and the super capacitor can be fully exerted.

In this embodiment, the hybrid energy source includes a power battery and a super capacitor.

Referring to fig. 1, a flow chart of a multi-energy control method for a fuel cell according to an embodiment of the present invention includes the following steps:

and 101, realizing the startup and shutdown control of the fuel cell based on the preset startup and shutdown conditions of the fuel cell.

In a specific implementation process, preset on-off conditions of the fuel cell are respectively determined based on a power requirement of the whole vehicle, an optimal SOC interval of the power cell, an optimal SOC interval of the super capacitor and a high-efficiency working interval of the fuel cell, so that on-off control of the fuel cell is realized, and a stable output state of the fuel cell is maintained.

The method realizes the startup and shutdown control of the fuel cell based on the preset startup and shutdown conditions of the fuel cell, and specifically comprises one of the following technical schemes:

(1) when the SOC of the super capacitor and the SOC of the power battery are both smaller than the lowest limit value in the respectively specified optimal SOC interval, the stored energy of the SOC of the super capacitor and the stored energy of the SOC of the power battery are insufficient, and charging is needed. Therefore, the fuel cell is started to charge the composite energy source, and simultaneously, the power output is independently provided for the whole vehicle.

Further, in the process that the fuel cell is started to charge the composite energy source, determining first charging power of the fuel cell according to a first charging power calculation formula; charging a power battery in the compound energy source according to the first charging power; and/or determining a second charging power of the fuel cell according to a second charging power calculation formula; and charging the super capacitor in the composite energy source according to the second charging power.

Further, the first charging power formula is as follows:

wherein, P_chgThe SOC is the charging power of the fuel cell, SOC is the current remaining charge of the power cell, cs _ hi _ SOC is the maximum limit value of the power cell SOC, and cs _ lo _ SOC is the minimum limit value of the power cell SOC. The SOC of the power battery is controlled between 0.3 and 0.7.

The second charging power formula is as follows:the SOC ' is the current remaining charge of the super capacitor, cs _ hi _ SOC ' is the highest limit value of the SOC of the super capacitor, cs _ lo _ SOC ' is the lowest limit value of the SOC of the super capacitor, and the SOC of the super capacitor is controlled to be 0.4-0.9.

The method can determine the first charging power and the second charging power according to the actual conditions of the power battery and the super capacitor. The two charging powers are used for correcting the required power of the fuel cell, and the charging power can be accurately provided for the power battery and the super capacitor. Therefore, the fuel cell corrected power includes: the first-stage shunt power of the required power of the whole vehicle, the charging power of a power battery and the charging power of a super capacitor.

(2) When the SOC of the super capacitor and the SOC of the power battery are both larger than or equal to the maximum limit value in the respectively specified optimal SOC interval, the SOC of the super capacitor and the SOC of the power battery can provide output power for the whole vehicle, and therefore the fuel battery is shut down. The specific power distribution of the super capacitor and the power battery is consistent with the implementation of the secondary power shunt, so that the detailed description is omitted here.

(3) And when the SOC of the super capacitor and/or the SOC of the power battery are in the respectively specified optimal SOC interval, determining the on-off state of the fuel battery according to the on-off condition of the fuel battery at the last moment. For example, if the fuel cell was in the on state at the previous time, the fuel cell was also in the on state at that time. And if the fuel cell is in the shutdown state at the last moment, the fuel cell is also in the shutdown state at the moment.

It should be noted that when the SOC of the super capacitor and/or the SOC of the power battery are within the respective specified optimal SOC intervals, it is necessary to further determine whether the super capacitor and/or the power battery are in a charging state or a discharging state. If the hybrid energy source is in the charging state, the fuel cell is started to charge the hybrid energy source, and simultaneously, the power output is independently provided for the whole vehicle. If the power distribution system is in the discharging state, the fuel cell is started, and the fuel cell, the super capacitor and the power battery need to carry out power distribution on the power required by the whole vehicle according to the distribution strategy. If any one of the super capacitor and the power battery is in a charging state, the fuel battery is started to charge the super capacitor or the power battery, and after the charging is finished, the fuel battery, the super capacitor and the power battery need to carry out power shunting on the required power of the whole vehicle according to the shunting strategy.

The specific calculation method of the charging power is the same as that of the above embodiment, and therefore, the detailed description thereof is omitted here.

(4) And when the required power of the whole vehicle is larger than the maximum power which can be provided by the composite energy source, the fuel cell is started. At the moment, the fuel cell, the super capacitor and the power battery need to carry out power shunting on the power required by the whole vehicle according to the shunting strategy.

(5) And if the limited minimum power when the fuel cell is started is the minimum power when the fuel cell works in the high-efficiency power area, starting the fuel cell. At the moment, the fuel cell, the super capacitor and the power battery need to carry out power shunting on the power required by the whole vehicle according to the shunting strategy.

And step 102, if the fuel cell is in a starting state, determining a shunting strategy based on the power required by the whole vehicle, the power of the fuel cell and the power provided by the composite energy source.

In a specific implementation process, if the fuel cell is in a starting state, the super capacitor SOC or the power battery SOC is between the respective specified limit values and is in a discharging state, and a shunting strategy is determined based on the required power of the whole vehicle, the power of the fuel cell and the power provided by the composite energy source. Further, if the required power of the whole vehicle is larger than the maximum power which can be provided by the composite energy source, a shunting strategy is determined based on the required power of the whole vehicle, the power of the fuel cell and the power provided by the composite energy source. If the required power of the whole vehicle is less than or equal to the maximum power which can be provided by the composite energy source, the composite energy source provides power, and the fuel cell is in a shutdown state at the moment.

And if the required power of the whole vehicle is more than or equal to the maximum power of the fuel cell, the super capacitor and the power cell are required to carry out power shunting on the required power of the whole vehicle according to the shunting strategy.

The shunting strategy at this time includes two-stage power shunting, and the two-stage power shunting will be described in detail later, which is not described herein again.

If the hybrid energy source cannot provide power support, for example, the super capacitor SOC and the power battery SOC are both smaller than the minimum value in the respectively specified optimal SOC interval, or the super capacitor SOC (and/or the power battery SOC) are in the respectively specified optimal SOC interval but are in a charging state, the required power of the whole vehicle is provided by the fuel battery alone.

And 103, carrying out power distribution on the required power of the whole vehicle according to the distribution strategy.

In the shunting strategy, two stages of power shunting are included.

The power required by the whole vehicle is subjected to primary power distribution through the power provided by the fuel cell, and the power distribution of the power battery and the super capacitor is performed through the composite energy source logic threshold filtering control, so that secondary power distribution is completed.

The priority of the primary power split is higher than the priority of the secondary power split. Namely: in the embodiment, the power splitting is divided into two stages of power splitting, the power provided by the fuel cell is preferentially passed to provide power output for the whole vehicle, and if the power provided by the fuel cell cannot meet the power required by the whole vehicle, the two stages of power splitting are completed through the composite energy.

Further, if the required power of the whole vehicle is smaller than the maximum power of the fuel cell in the high-efficiency power area, the fuel cell is taken as a discharging main body to perform primary power shunting, and when the variable load occurs, the power of the power cell and the super capacitor is distributed and discharged through the composite energy source logic threshold filtering control, and the power is taken as secondary power shunting to fill the variable load.

And if the required power of the whole vehicle is more than or equal to the maximum power of the fuel cell in the high-efficiency power area, performing primary power distribution according to the maximum power discharge of the fuel cell, performing power distribution and discharge of the power cell and the super capacitor through composite energy logical threshold filtering control, and completing secondary power distribution.

Further, in the secondary power splitting process, when the super capacitor SOC is smaller than the lowest limit value of the logic threshold, for example, 0.4. The power battery discharges, and the super capacitor does not discharge. When the SOC of the super capacitor is in a logic threshold, the super capacitor and the power battery are both discharged, and the discharge power of the power battery is slowed down through filtering control.

Specifically, when the super capacitor SOC is within a logic threshold, for example, between 0.4-0.9. The super capacitor and the power battery are discharged, and the power battery delays the provided power through filtering control, so that the super capacitor provides power preferentially.

As an optional embodiment, after the power required by the entire vehicle is split according to the splitting strategy, when regenerative braking is performed, feedback energy is present, at this time, both the super capacitor and the power battery are charged, the charging power of the power battery is slowed down through filtering control, and the super capacitor is charged preferentially.

Therefore, the fuel cell, the power cell and the super capacitor are mutually controlled in logic, and the optimal energy management of the composite power supply system is realized. The problems of high coupling degree of a compound power supply and complex control strategy are solved, the fuel cell can stably run under different running conditions, the service life of the fuel cell is prolonged, and the advantages of the fuel cell, the power cell and the super capacitor can be fully exerted.

Based on the same inventive concept, the following embodiments disclose a control apparatus of a fuel cell multi-energy power system, referring to fig. 2, including:

the startup and shutdown control module 201 is configured to implement startup and shutdown control of the fuel cell based on a preset startup and shutdown condition of the fuel cell;

a determining module 202, configured to determine, if the fuel cell is in a power-on state, a shunting strategy based on a power required by a vehicle, a power of the fuel cell, and a power provided by a composite energy source; the hybrid energy source comprises: a power battery and a super capacitor;

the power distribution module 203 is used for carrying out power distribution on the required power of the whole vehicle according to the distribution strategy; the shunting strategy comprises two-stage power shunting, wherein the required power of the whole vehicle is subjected to primary power shunting through the power provided by the fuel cell, and the power distribution of the power battery and the super capacitor is performed through composite energy logic threshold filtering control to complete secondary power shunting; the priority of the primary power split is higher than the priority of the secondary power split.

Preferably, the on-off control module 201 is specifically configured to one of the following:

when the SOC of the super capacitor and the SOC of the power battery are both smaller than the lowest limit value in the respectively specified optimal SOC interval, the fuel battery is started to charge the composite energy source, and simultaneously, the power output is independently provided for the whole vehicle;

when the SOC of the super capacitor and the SOC of the power battery are both larger than or equal to the maximum limit value in the respectively specified optimal SOC interval, the fuel battery is shut down;

when the SOC of the super capacitor and/or the SOC of the power battery are in the respectively specified optimal SOC interval, determining the on-off state of the fuel battery according to the on-off condition of the fuel battery at the previous moment;

when the required power of the whole vehicle is larger than the maximum power which can be provided by the composite energy source, the fuel cell is started;

and if the limited minimum power when the fuel cell is started is the minimum power when the fuel cell works in the high-efficiency power area, starting the fuel cell.

Preferably, the on-off control module 201 is specifically configured to determine a first charging power of the fuel cell according to a first charging power calculation formula; charging a power battery in the compound energy source according to the first charging power; and/or

Determining a second charging power of the fuel cell according to a second charging power calculation formula; and charging the super capacitor in the composite energy source according to the second charging power.

Preferably, the first charging power formula is as follows:

wherein, P_chgThe charging power of the fuel cell is adopted, the SOC is the current residual charge of the power cell, cs _ hi _ SOC is the maximum limit value of the SOC of the power cell, and cs _ lo _ SOC is the minimum limit value of the SOC of the power cell;

the second charging power formula is as follows:the SOC ' is the current remaining charge of the super capacitor, cs _ hi _ SOC ' is the maximum limit value of the super capacitor SOC, and cs _ lo _ SOC ' is the minimum limit value of the super capacitor SOC.

Preferably, the determining module 202 is configured to determine, if the fuel cell is in a power-on state, the super capacitor SOC and the power battery SOC are between respective specified limits and both are in a discharge state, and determine the shunting strategy based on the power required by the entire vehicle, the power of the fuel cell, and the power provided by the hybrid energy source.

Preferably, the power distribution module 203 is configured to, if the power required by the whole vehicle is less than the maximum power of the fuel cell, perform primary power splitting by using the fuel cell as a discharging main body, and when a variable load occurs, perform power distribution and discharging of the power cell and the super capacitor through composite energy logic threshold filtering control, and perform secondary splitting to fill the variable load;

and if the required power of the whole vehicle is more than or equal to the maximum power of the fuel cell, performing primary power distribution according to the maximum power discharge of the fuel cell, performing power distribution and discharge of the power cell and the super capacitor through composite energy logical threshold filtering control, and completing secondary power distribution.

Preferably, the power distribution module 203 is configured to discharge the power battery and not discharge the super capacitor when the SOC of the super capacitor is smaller than the lowest limit value of the logic threshold;

when the SOC of the super capacitor is in a logic threshold, the super capacitor and the power battery are both discharged, and the discharge power of the power battery is slowed down through filtering control.

Preferably, the apparatus further comprises:

and the charging module is used for charging the super capacitor and the power battery when regenerative braking is carried out, and the charging power of the power battery is controlled to be slowed down through filtering.

Based on the same inventive concept, the following embodiments disclose a vehicle including a fuel cell multi-energy control method as in one or more of the above embodiments.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.