CN111775773A - Vehicle fuel cell power control method and device - Google Patents

Vehicle fuel cell power control method and device Download PDF

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Publication number
CN111775773A
CN111775773A CN202010513609.4A CN202010513609A CN111775773A CN 111775773 A CN111775773 A CN 111775773A CN 202010513609 A CN202010513609 A CN 202010513609A CN 111775773 A CN111775773 A CN 111775773A
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power
battery
cell
fuel cell
charging
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CN202010513609.4A
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CN111775773B (en
Inventor
李元
何锋
李龙
卢明飞
邓庆延
罗杏宜
李小龙
王萱宇
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Guangdong Sinosynergy Hydrogen Power Technology Co ltd
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Guangdong Sinosynergy Hydrogen Power Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Fuel Cell (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a vehicle fuel cell power control method and a device, wherein the control method comprises the following steps: acquiring actual charging power of a power battery, pulse charging duration of the power battery and pulse charging target time of the power battery; when the actual charging power of the power battery is detected to be larger than the stable constant current charging power of the power battery, and the pulse charging duration time of the power battery is detected to be larger than the pulse charging target time of the power battery, controlling the power of the fuel battery to be reduced to a first target power; and when the actual charging power of the power battery is detected to be less than or equal to the stable constant current charging power of the power battery, controlling the power of the fuel battery to be increased to a second target power. The invention provides a power control method and a power control device for a vehicle fuel cell, which aim to solve the technical problem that the prior art cannot reasonably control the fuel cell, so that the braking performance of the whole vehicle is poor.

Description

Vehicle fuel cell power control method and device
Technical Field
The invention relates to the technical field of battery management, in particular to a power control method and device for a vehicle fuel cell.
Background
The hydrogen energy is used as effective clean energy because the products of the hydrogen and the oxygen only contain water, and the hydrogen fuel cell automobile has a vital function for solving the environmental pollution caused by the current fuel automobile era and has a development prospect compared with the current pure electric automobile. The existing hydrogen fuel cell can not recover the driving motor to feed back the braking energy, and the power cell is used for recovering the driving motor to feed back the braking energy after an auxiliary power cell is added, but the prior art can not reasonably control the power of the fuel cell, so that the braking performance of the whole vehicle is poor.
Disclosure of Invention
The invention provides a power control method and a power control device for a vehicle fuel cell, which aim to solve the technical problem that the prior art cannot reasonably control the fuel cell, so that the braking performance of the whole vehicle is poor.
A first embodiment of the invention provides a vehicle fuel cell power control method including:
acquiring actual charging power of a power battery, pulse charging duration of the power battery and pulse charging target time of the power battery;
when the actual charging power of the power battery is detected to be larger than the stable constant current charging power of the power battery, and the pulse charging duration time of the power battery is detected to be larger than the pulse charging target time of the power battery, controlling the power of the fuel battery to be reduced to a first target power;
and when the actual charging power of the power battery is detected to be less than or equal to the stable constant current charging power of the power battery, controlling the power of the fuel battery to be increased to a second target power.
Further, the controlling the fuel cell power to be reduced to the first target power specifically includes:
and setting the load reduction rate of the fuel cell, and calculating to obtain first target power according to the load reduction rate power cell pulse charging duration and the power cell pulse charging target time.
Further, the sum of the time for loading the fuel cell rate to the first target power and the power cell pulse charging target time is less than or equal to the power cell pulse charging duration.
Further, the pulse target time of the power battery is determined according to statistics of pulse charging duration of the power battery operated under different line conditions.
Further, the controlling the fuel cell power to be increased to the second target power specifically includes:
and acquiring a current power battery SOC interval, and controlling the power of the fuel battery to be loaded to the power of the fuel battery corresponding to the current power battery SOC.
A second embodiment of the invention provides a vehicle fuel cell power control apparatus including: the device comprises an acquisition module, a first control module and a second control module;
the acquisition module is used for acquiring the actual charging power of the power battery, the pulse charging duration time of the power battery and the pulse charging target time of the power battery;
the first control module is used for controlling the power of the fuel cell to be reduced to a first target power when the fact that the actual charging power of the power cell is larger than the stable constant-current charging power of the power cell and the pulse charging duration time of the power cell is larger than the pulse charging target time of the power cell are detected;
and the second control module is used for controlling the power of the fuel cell to be loaded to a second target power when the actual charging power of the power cell is detected to be less than or equal to the stable constant-current charging power of the power cell.
Further, the first control module comprises:
and setting the load reduction rate of the fuel cell, and calculating to obtain first target power according to the load reduction rate power cell pulse charging duration and the power cell pulse charging target time.
Further, the sum of the time for loading the fuel cell rate to the first target power and the power cell pulse charging target time is less than or equal to the power cell pulse charging duration.
Further, the pulse target time of the power battery is determined according to statistics of pulse charging duration of the power battery operated under different line conditions.
Further, the second control module comprises:
and acquiring a current power battery SOC interval, and controlling the power of the fuel battery to be loaded to the power of the fuel battery corresponding to the current power battery SOC.
The invention provides a vehicle fuel cell power control method and a device, which controls the power of a fuel cell by acquiring the actual charging power of the power cell, the pulse charging duration time of the power cell and the pulse charging target time of the power cell by acquiring the power cell, comparing the actual charging power of the power cell with the stable constant current charging power of the power cell and comparing the pulse charging duration time of the power cell with the pulse charging target time of the power cell, so that the power of the fuel cell is controlled in a reasonable range, the repeated load change of the fuel cell is avoided, the availability of the power of the fuel cell can be effectively improved, and the braking performance of the whole vehicle is favorably improved.
Drawings
FIG. 1 is a schematic flow chart diagram of a method for controlling power of a vehicle fuel cell in accordance with an embodiment of the present invention;
FIG. 2 is another schematic flow chart diagram of a vehicle fuel cell power control method provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a vehicle fuel cell power control device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1-2, a first embodiment of the present invention provides a power control method for a fuel cell of a vehicle as shown in fig. 1, including:
s1, acquiring the actual charging power of the power battery, the pulse charging duration time of the power battery and the pulse charging target time of the power battery;
in the embodiment of the invention, the pulse charging target time of the power battery is determined according to the statistics of the duration that the actual charging power of the power battery running under different route conditions of the bus working condition of the whole bus is greater than the stable constant current charging power of the power battery, so that the pulse charging capability of the power battery can be fully utilized, and the frequent power load change of the fuel battery can be avoided.
Optionally, the embodiment of the present invention further obtains a state of the entire vehicle, determines whether the power battery is in a feedback charging state after the obtaining of the actual charging power of the power battery, the pulse charging duration time of the power battery, and the pulse charging target time of the power battery is completed, and executes step S2 when the power battery is determined to be in the feedback charging state, please refer to fig. 2, which is another flow diagram of the method for controlling the power of the fuel cell of the vehicle according to the embodiment of the present invention.
S2, when the fact that the actual charging power of the power battery is larger than the stable constant current charging power of the power battery and the pulse charging duration time of the power battery is larger than the pulse charging target time of the power battery is detected, controlling the power of the fuel battery to be reduced to a first target power;
optionally, when the actual charging power of the power battery is greater than the stable constant-current charging power of the power battery, the power battery has an overcharge phenomenon, and the fuel battery is unloaded to the first target power, so that the phenomenon that the braking performance of the power is poor and the braking performance is inconsistent due to the poor performance of the power brake when the driving motor rotates at a high speed is avoided.
After the power of the fuel cell is reduced to the first target power, whether the first target power is smaller than or equal to the stable constant-current charging power of the power cell is judged, and if yes, the power of the fuel cell is controlled to be reduced from the first target power to the power of the fuel cell corresponding to the current power cell SOC interval.
S3, when the fact that the actual charging power of the power battery is smaller than or equal to the stable constant current charging power of the power battery is detected, controlling the power of the fuel battery to be increased to a second target power;
according to the embodiment of the invention, the actual charging power of the power battery, the pulse charging duration time of the power battery and the pulse charging target time of the power battery are obtained by obtaining the power battery, and the power of the fuel battery is controlled according to the comparison of the actual charging power of the power battery and the stable constant current charging power of the power battery and the comparison of the pulse charging duration time of the power battery and the pulse charging target time of the power battery, so that the power of the fuel battery is controlled in a reasonable range, the repeated load change of the fuel battery is avoided, the availability of the power of the fuel battery can be effectively improved, and the braking performance of the whole vehicle is favorably improved.
As a specific implementation manner of the embodiment of the present invention, controlling the fuel cell power to be down-loaded to the first target power specifically includes:
and setting the load reduction rate of the fuel cell, and calculating to obtain first target power according to the load reduction rate power cell pulse charging duration and the power cell pulse charging target time.
Specifically, the first target power is obtained according to the following formula:
Pm-Pl≤α×(t0+t1)
wherein, PmAt the highest power, P, of the fuel celllIs a first target power, t0Is a target time, t1For the power cell pulse charge duration, α is the fuel cell load shedding rate.
It should be noted that, because the fuel cell charges the power cell with the current gear power when the vehicle brakes, and the braking feedback generated by the driving motor also charges the power cell, when the driving motor brakes at a high rotating speed, the maximum feedback power of the power cell + the maximum power of the fuel cell is less than or equal to the actual pulse charging power of the power cell, and the consistency of the braking performance of the whole vehicle can be realized.
As a specific implementation of the embodiment of the invention, the sum of the time for loading the fuel cell rate to the first target power and the pulse charging target time of the power battery is less than or equal to the pulse charging duration of the power battery.
According to the characteristics of the power battery, the power battery can provide pulse charging for a certain time longer than a constant current while meeting continuous constant current charging.
As a specific implementation manner of the embodiment of the invention, the pulse target time of the power battery is determined according to the pulse charging duration statistics of the power battery operated under different line conditions.
As a specific implementation manner of the embodiment of the present invention, controlling the fuel cell power to be boosted to the second target power specifically includes:
and acquiring the current power battery SOC interval, and controlling the power of the fuel battery to be loaded to the power of the fuel battery corresponding to the current power battery SOC.
It should be noted that, the power of the fuel cell corresponding to the interval of the power cell is set as a control strategy, and when the actual charging power of the power cell is detected to be less than or equal to the stable constant current charging power of the power cell, the power of the fuel cell is boosted to a second target power according to the preset control strategy, so that the power of the fuel cell is more reasonable, the power availability of the fuel cell is improved, and the braking performance and the braking consistency of the whole vehicle are improved.
The embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, the actual charging power of the power battery, the pulse charging duration time of the power battery and the pulse charging target time of the power battery are obtained by obtaining the power battery, and the power of the fuel battery is controlled according to the comparison of the actual charging power of the power battery and the stable constant current charging power of the power battery and the comparison of the pulse charging duration time of the power battery and the pulse charging target time of the power battery, so that the power of the fuel battery is controlled in a reasonable range, the repeated load change of the fuel battery is avoided, the availability of the power of the fuel battery can be effectively improved, and the braking performance of the whole vehicle is favorably improved.
Furthermore, the sum of the time for reducing the fuel cell rate to the first target power and the pulse charging target time of the power battery is less than or equal to the pulse charging duration of the power battery, so that the phenomenon that the power battery is overcharged or the driving motor feeds back limited power due to the fact that the pulse charging duration is too short can be effectively avoided, the driving motor braking feedback energy can be fully utilized, the vehicle endurance mileage is improved, and meanwhile the braking performance and the braking consistency in the braking process of the whole vehicle are improved.
Referring to fig. 3, a second embodiment of the present invention provides a vehicle fuel cell power control apparatus as shown in fig. 3, characterized by comprising: the system comprises an acquisition module 10, a first control module 20 and a second control module 20;
the acquisition module 10 is used for acquiring the actual charging power of the power battery, the pulse charging duration of the power battery and the pulse charging target time of the power battery;
in the embodiment of the invention, the pulse charging target time of the power battery is determined according to the statistics of the duration that the actual charging power of the power battery running under different route conditions of the bus working condition of the whole bus is greater than the stable constant current charging power of the power battery, so that the pulse charging capability of the power battery can be fully utilized, and the frequent power load change of the fuel battery can be avoided.
Optionally, the embodiment of the present invention further obtains a state of the entire vehicle, determines whether the power battery is in a feedback charging state after obtaining the actual charging power of the power battery, the pulse charging duration of the power battery, and the pulse charging target time of the power battery, and executes the first control module 20 when determining that the power battery is in the feedback charging state.
The first control module 20 is used for controlling the power of the fuel cell to be reduced to a first target power when detecting that the actual charging power of the power cell is larger than the stable constant-current charging power of the power cell and the pulse charging duration time of the power cell is larger than the pulse charging target time of the power cell;
optionally, when the actual charging power of the power battery is greater than the stable constant-current charging power of the power battery, the power battery has an overcharge phenomenon, and the fuel battery is unloaded to the first target power, so that the phenomenon that the braking performance of the power is poor and the braking performance is inconsistent due to the poor performance of the power brake when the driving motor rotates at a high speed is avoided.
Optionally, after the fuel cell power is reduced to the first target power, whether the first target power is less than or equal to the stable constant-current charging power of the power cell is determined, and if so, the fuel cell power is controlled to be reduced from the first target power to the fuel cell power corresponding to the current power cell SOC interval.
And the second control module 20 is configured to control the power of the fuel cell to be loaded to a second target power when detecting that the actual charging power of the power cell is less than or equal to the stable constant-current charging power of the power cell.
According to the embodiment of the invention, the actual charging power of the power battery, the pulse charging duration time of the power battery and the pulse charging target time of the power battery are obtained by obtaining the power battery, and the power of the fuel battery is controlled according to the comparison of the actual charging power of the power battery and the stable constant current charging power of the power battery and the comparison of the pulse charging duration time of the power battery and the pulse charging target time of the power battery, so that the power of the fuel battery is controlled in a reasonable range, the repeated load change of the fuel battery is avoided, the availability of the power of the fuel battery can be effectively improved, and the braking performance of the whole vehicle is favorably improved.
As a specific implementation manner of the embodiment of the present invention, the first control module 20 includes:
and setting the load reduction rate of the fuel cell, and calculating to obtain first target power according to the load reduction rate power cell pulse charging duration and the power cell pulse charging target time.
Specifically, the first target power is obtained according to the following formula:
Pm-Pl≤α×(t0+t1)
wherein, PmAt the highest power, P, of the fuel celllIs a first target power, t0Is a target time, t1For the power cell pulse charge duration, α is the fuel cell load shedding rate.
It should be noted that, because the fuel cell charges the power cell with the current gear power when the vehicle brakes, and the braking feedback generated by the driving motor also charges the power cell, when the driving motor brakes at a high rotating speed, the maximum feedback power of the power cell + the maximum power of the fuel cell is less than or equal to the actual pulse charging power of the power cell, and the consistency of the braking performance of the whole vehicle can be realized.
As a specific implementation of the embodiment of the invention, the sum of the time for loading the fuel cell rate to the first target power and the pulse charging target time of the power battery is less than or equal to the pulse charging duration of the power battery.
According to the characteristics of the power battery, the power battery can provide pulse charging for a certain time longer than a constant current while meeting continuous constant current charging.
As a specific implementation manner of the embodiment of the invention, the pulse target time of the power battery is determined according to the pulse charging duration statistics of the power battery operated under different line conditions.
As a specific implementation manner of the embodiment of the present invention, the second control module 20 includes:
and acquiring the current power battery SOC interval, and controlling the power of the fuel battery to be loaded to the power of the fuel battery corresponding to the current power battery SOC.
It should be noted that, the power of the fuel cell corresponding to the interval of the power cell is set as a control strategy, and when the actual charging power of the power cell is detected to be less than or equal to the stable constant current charging power of the power cell, the power of the fuel cell is boosted to a second target power according to the preset control strategy, so that the power of the fuel cell is more reasonable, the power availability of the fuel cell is improved, and the braking performance and the braking consistency of the whole vehicle are improved.
The embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, the actual charging power of the power battery, the pulse charging duration time of the power battery and the pulse charging target time of the power battery are obtained by obtaining the power battery, and the power of the fuel battery is controlled according to the comparison of the actual charging power of the power battery and the stable constant current charging power of the power battery and the comparison of the pulse charging duration time of the power battery and the pulse charging target time of the power battery, so that the power of the fuel battery is controlled in a reasonable range, the repeated load change of the fuel battery is avoided, the availability of the power of the fuel battery can be effectively improved, and the braking performance of the whole vehicle is favorably improved.
Furthermore, the sum of the time for reducing the fuel cell rate to the first target power and the pulse charging target time of the power battery is less than or equal to the pulse charging duration of the power battery, so that the phenomenon that the power battery is overcharged or the driving motor feeds back limited power due to the fact that the pulse charging duration is too short can be effectively avoided, the driving motor braking feedback energy can be fully utilized, the vehicle endurance mileage is improved, and meanwhile the braking performance and the braking consistency in the braking process of the whole vehicle are improved.
The foregoing is a preferred embodiment of the present invention, and it should be noted that it would be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are also considered to be within the scope of the invention.

Claims (10)

1. A vehicle fuel cell power control method characterized by comprising:
acquiring actual charging power of a power battery, pulse charging duration of the power battery and pulse charging target time of the power battery;
when the actual charging power of the power battery is detected to be larger than the stable constant current charging power of the power battery, and the pulse charging duration time of the power battery is detected to be larger than the pulse charging target time of the power battery, controlling the power of the fuel battery to be reduced to a first target power;
and when the actual charging power of the power battery is detected to be less than or equal to the stable constant current charging power of the power battery, controlling the power of the fuel battery to be increased to a second target power.
2. The vehicle fuel cell power control method of claim 1, wherein controlling the fuel cell power down to a first target power specifically comprises:
and setting the load reduction rate of the fuel cell, and calculating to obtain first target power according to the load reduction rate power cell pulse charging duration and the power cell pulse charging target time.
3. The vehicle fuel cell power control method according to claim 1 or 2, characterized in that the sum of the time to load the fuel cell rate down to the first target power and the power cell pulse charge target time is equal to or less than the power cell pulse charge duration.
4. The vehicle fuel cell power control method of claim 1, wherein the power cell pulse charge target time is statistically determined based on the power cell pulse charge duration for different line conditions of operation.
5. The vehicle fuel cell power control method of claim 1, wherein controlling the fuel cell power ramp-up to a second target power specifically comprises:
and acquiring a current power battery SOC interval, and controlling the power of the fuel battery to be loaded to the power of the fuel battery corresponding to the current power battery SOC.
6. A vehicular fuel cell power control apparatus characterized by comprising: the device comprises an acquisition module, a first control module and a second control module;
the acquisition module is used for acquiring the actual charging power of the power battery, the pulse charging duration time of the power battery and the pulse charging target time of the power battery;
the first control module is used for controlling the power of the fuel cell to be reduced to a first target power when the fact that the actual charging power of the power cell is larger than the stable constant-current charging power of the power cell and the pulse charging duration time of the power cell is larger than the pulse charging target time of the power cell are detected;
and the second control module is used for controlling the power of the fuel cell to be loaded to a second target power when the actual charging power of the power cell is detected to be less than or equal to the stable constant-current charging power of the power cell.
7. The vehicle fuel cell power control method according to claim 6, wherein the first control module includes means for:
and setting the load reduction rate of the fuel cell, and calculating to obtain first target power according to the load reduction rate power cell pulse charging duration and the power cell pulse charging target time.
8. The vehicle fuel cell power control method according to claim 6 or 7, characterized in that the sum of the time to load the fuel cell rate down to the first target power and the power cell pulse charge target time is equal to or less than the power cell pulse charge duration.
9. The vehicle fuel cell power control method of claim 1, wherein the power cell pulse target time is statistically determined based on the power cell pulse charge duration for different line conditions of operation.
10. The vehicle fuel cell power control method according to claim 6, wherein the second control module includes means for:
and acquiring a current power battery SOC interval, and controlling the power of the fuel battery to be loaded to the power of the fuel battery corresponding to the current power battery SOC.
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Cited By (2)

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CN114559822A (en) * 2022-04-27 2022-05-31 潍柴动力股份有限公司 Load reduction control method, device and equipment for fuel cell engine
CN116080482A (en) * 2023-04-11 2023-05-09 宁德时代新能源科技股份有限公司 Power control method, device, equipment and storage medium of electric equipment

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