CN112829639A - Fuel cell automobile power distribution method - Google Patents
Fuel cell automobile power distribution method Download PDFInfo
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- CN112829639A CN112829639A CN202110280428.6A CN202110280428A CN112829639A CN 112829639 A CN112829639 A CN 112829639A CN 202110280428 A CN202110280428 A CN 202110280428A CN 112829639 A CN112829639 A CN 112829639A
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- fuel cell
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- lithium battery
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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
- B60L58/40—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for controlling a combination of batteries and fuel cells
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- 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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Life Sciences & Earth Sciences (AREA)
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- Fuel Cell (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a power distribution method for a fuel cell vehicle, which relates to the technical field of fuel cell vehicles and comprises the following steps: s1, setting a plurality of power gears in a high-efficiency area according to the output characteristics of a fuel cell system, determining a specific numerical value of power output of each power gear of the fuel cell according to a power and efficiency characteristic curve of the fuel cell, and taking the specific numerical value as a power control target of the fuel cell system; s2, setting SOC control target percentage according to the working characteristics of the lithium battery; s3, reading the SOC of the lithium battery, and selecting a corresponding working mode according to a preset SOC range; s4, selecting a fixed time window, collecting the average power required by the working condition of the real vehicle, and judging the power gear of the fuel cell system in the current working mode; and S5, receiving the actual output power of the fuel cell to obtain the result of the power distribution of the vehicle.
Description
Technical Field
The invention relates to the technical field of fuel cell automobiles, in particular to a power distribution method of a fuel cell automobile.
Background
The existing fuel cell new energy automobile mostly adopts a fuel cell and a lithium battery to provide electric energy for the automobile together so as to drive the automobile to run. The power demand of the fuel cell is changed along with the power demand curve of the whole vehicle, and the part of the fuel cell which cannot respond timely is supplemented or absorbed by the lithium battery.
Such an operation manner of varying the required power of the fuel cell in real time is disadvantageous to the stable output of the fuel cell according to the output characteristics of the fuel cell system, and may reduce the cycle life and the economy of the fuel cell system.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a power distribution method for a fuel cell vehicle, which aims to control the SOC range and prolong the time of the fuel cell working at stable power as far as possible so as to achieve the purpose of improving the cycle life and the economical efficiency of a fuel cell system.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a fuel cell vehicle power distribution method includes the following steps: s1, setting a plurality of power gears in a high-efficiency area according to the output characteristics of a fuel cell system, determining a specific numerical value of power output of each power gear of the fuel cell according to a power and efficiency characteristic curve of the fuel cell, and taking the specific numerical value as a power control target of the fuel cell system; s2, setting SOC control target percentage according to the working characteristics of the lithium battery; s3, reading the SOC of the lithium battery, and selecting a corresponding working mode according to a preset SOC range; s4, selecting a fixed time window, collecting the average power required by the working condition of the real vehicle, and judging the power gear of the fuel cell system in the current working mode; and S5, receiving the actual output power of the fuel cell to obtain the result of the power distribution of the vehicle.
On the basis of the technical scheme, the working modes comprise a first mode: the fuel cell is not allowed to charge the lithium battery, no braking feedback and sliding feedback exist, and the fuel cell system is preheated for standby and is not output; in the second mode: the fuel cell is not allowed to charge the lithium battery, braking feedback and sliding feedback exist, and the fuel cell system is preheated for standby and is not output; in the third mode: allowing the fuel cell to charge the lithium battery, and having braking feedback and sliding feedback; the output power of the fuel cell is stabilized at the maximum efficient output point lower than vcu required power and does not exceed the charge-discharge limit of the lithium battery, and the lithium battery assists in outputting or inputting; a fourth mode: allowing the fuel cell to charge the lithium battery, and having braking feedback and sliding feedback; the output power of the fuel cell is stabilized at a minimum efficient output point higher than vcu required power and does not exceed the charge-discharge limit of the lithium battery, and the lithium battery assists in outputting or inputting; a fifth mode: maximum power output of the fuel cell.
On the basis of the technical scheme, in the fourth mode and the fifth mode, the average power required in vcu set time is not matched with the current output power gear of the fuel cell, and the fuel cell performs power output adjustment.
On the basis of the technical scheme, the SOC control target percentage comprises a first set percentage, a second set percentage, a third set percentage and a fourth set percentage; when the SOC is larger than or equal to a first set percentage, the working mode selects a first mode; when the second set percentage is less than or equal to the SOC < the first set percentage, the working mode selects a second mode; when the third set percentage is less than or equal to the SOC < the second set percentage, the working mode selects a third mode; when the fourth set percentage is less than or equal to the SOC < the third set percentage, the working mode selects a fourth mode; the operating mode selects the fifth mode when SOC < the fourth set percentage.
On the basis of the technical scheme, the first set percentage, the second set percentage, the third set percentage and the fourth set percentage are 95%, 90%, 70% and 40% in sequence.
The invention has the beneficial effects that:
the vcu presets a plurality of working power points of the fuel cell according to the output characteristic of the fuel cell by the characteristics of the lithium cell and the fuel cell, so that the fuel cell works in the best state, the frequent change of the power of the fuel cell is prevented, and meanwhile, the working condition of the lithium cell is controlled in the maximum charge-discharge capacity interval, and the cycle life and the working capacity of the fuel cell are improved.
Drawings
Fig. 1 is a schematic diagram of the power characteristics of a fuel cell system in an embodiment of the invention.
Detailed Description
The technical scheme and the beneficial effects of the invention are clearer and clearer by further describing the specific embodiment of the invention with the accompanying drawings of the specification. The embodiments described below are exemplary and are intended to be illustrative of the invention, but are not to be construed as limiting the invention.
The invention provides a fuel cell automobile power distribution method, which comprises the following steps:
s1, setting a plurality of power gears in a high-efficiency area according to the output characteristics of a fuel cell system, determining a specific numerical value of power output of each power gear of the fuel cell according to a power and efficiency characteristic curve of the fuel cell, and taking the specific numerical value as a power control target of the fuel cell system;
s2, setting SOC control target percentage according to the working characteristics of the lithium battery;
s3, reading the SOC of the lithium battery, and selecting a corresponding working mode according to a preset SOC range;
s4, selecting a fixed time window, collecting the average power required by the working condition of the real vehicle, and judging the power gear of the fuel cell system in the current working mode;
and S5, receiving the actual output power of the fuel cell to obtain the result of the power distribution of the vehicle.
Specifically, the working modes comprise
In the first mode: the fuel cell is not allowed to charge the lithium battery, no braking feedback and sliding feedback exist, and the fuel cell system is preheated for standby and is not output;
in the second mode: the fuel cell is not allowed to charge the lithium battery, braking feedback and sliding feedback exist, and the fuel cell system is preheated for standby and is not output;
in the third mode: allowing the fuel cell to charge the lithium battery, and having braking feedback and sliding feedback; the output power of the fuel cell is stabilized at the maximum efficient output point lower than vcu required power and does not exceed the charge-discharge limit of the lithium battery, and the lithium battery assists in outputting or inputting;
a fourth mode: allowing the fuel cell to charge the lithium battery, and having braking feedback and sliding feedback; the output power of the fuel cell is stabilized at a minimum efficient output point higher than vcu required power and does not exceed the charge-discharge limit of the lithium battery, and the lithium battery assists in outputting or inputting;
a fifth mode: maximum power output of the fuel cell.
Specifically, in the fourth mode and the fifth mode, vcu the average power required in the set time does not match with the current output power gear of the fuel cell, and the fuel cell performs power output adjustment.
Specifically, the SOC control target percentage includes a first set percentage, a second set percentage, a third set percentage, and a fourth set percentage;
when the SOC is larger than or equal to a first set percentage, the working mode selects a first mode;
when the second set percentage is less than or equal to the SOC < the first set percentage, the working mode selects a second mode;
when the third set percentage is less than or equal to the SOC < the second set percentage, the working mode selects a third mode;
when the fourth set percentage is less than or equal to the SOC < the third set percentage, the working mode selects a fourth mode;
the operating mode selects the fifth mode when SOC < the fourth set percentage.
Specifically, the first set percentage, the second set percentage, the third set percentage, and the fourth set percentage are 95%, 90%, 70%, and 40% in sequence.
The invention is further illustrated by the following specific examples.
A lithium battery characteristic at operating temperature:
referring to the above table and fig. 1, an embodiment of the present invention provides a power distribution method for a fuel cell vehicle, including the following steps:
the method comprises the following steps: setting a plurality of power gears P1-Pn +1 according to the output characteristics of the fuel cell system, wherein the gears are in the high-efficiency working area of the fuel cell, determining the specific value of the power output of each power gear of the fuel cell according to the power and efficiency characteristic curve of the fuel cell, and using the specific value as the power control target of the fuel cell system
Step two: setting SOC control target percentage according to working characteristics of lithium battery
Step three: reading the SOC of the lithium battery in real time under the working condition, and selecting a corresponding working mode according to a preset SOC range
Step four: selecting a fixed time window, collecting the average power required by the working condition of the real vehicle, and judging the power gear of the fuel cell system in the current working mode
Step five: and receiving the actual output power of the fuel cell and obtaining the power distribution result of the vehicle.
The working mode is as follows:
1) SOC is more than or equal to 95%: the fuel cell is not allowed to charge the lithium battery, no braking feedback and sliding feedback are provided, the fuel cell system is preheated for standby, and no output is provided
2) SOC is more than or equal to 90% and less than 95%: the fuel cell is not allowed to charge the lithium battery, braking feedback and sliding feedback are provided, the fuel cell system is preheated for standby, and output is not carried out
3) SOC is more than or equal to 70% and less than 90%: the fuel cell is allowed to charge the lithium battery, and braking feedback and sliding feedback are provided. Receiving the average power Px required by the vehicle in a set time, judging that Pn is less than or equal to Px and less than Pn +1, stabilizing the output power of the fuel cell at Pn and not exceeding the power limit of pulse charging of the lithium battery, and performing auxiliary output or input of the lithium battery, wherein the power output of the fuel cell is adjusted.
4) SOC is more than or equal to 40% and less than 70%: the fuel cell is allowed to charge the lithium battery, and braking feedback and sliding feedback are provided. Receiving the average power Px required by the vehicle in the set time, judging that Pn is less than or equal to Px and less than Pn +1, stabilizing the output power of the fuel cell at Pn +1 and not exceeding the power limit of the pulse charging of the lithium battery, and performing auxiliary output or input of the lithium battery and power output adjustment on the fuel cell.
5) SOC < 40%, maximum power output of fuel cell.
In this example, vcu presets a plurality of operating power points of the fuel cell according to the output characteristics of the fuel cell by the characteristics of the lithium cell and the fuel cell, so that the fuel cell operates in the optimum state, thereby preventing the power of the fuel cell from changing frequently, and controlling the working condition of the lithium cell in the maximum charging and discharging capacity interval, thereby improving the cycle life and the operating capacity of the fuel cell.
In the description of the specification, reference to the description of "one embodiment", "preferably", "an example", "a specific example" or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention, and schematic representations of the terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (5)
1. A fuel cell vehicle power distribution method is characterized by comprising the following steps:
s1, setting a plurality of power gears in a high-efficiency area according to the output characteristics of a fuel cell system, determining a specific numerical value of power output of each power gear of the fuel cell according to a power and efficiency characteristic curve of the fuel cell, and taking the specific numerical value as a power control target of the fuel cell system;
s2, setting SOC control target percentage according to the working characteristics of the lithium battery;
s3, reading the SOC of the lithium battery, and selecting a corresponding working mode according to a preset SOC range;
s4, selecting a fixed time window, collecting the average power required by the working condition of the real vehicle, and judging the power gear of the fuel cell system in the current working mode;
and S5, receiving the actual output power of the fuel cell to obtain the result of the power distribution of the vehicle.
2. The fuel cell vehicle power distribution method according to claim 1, characterized in that: the working modes comprise
In the first mode: the fuel cell is not allowed to charge the lithium battery, no braking feedback and sliding feedback exist, and the fuel cell system is preheated for standby and is not output;
in the second mode: the fuel cell is not allowed to charge the lithium battery, braking feedback and sliding feedback exist, and the fuel cell system is preheated for standby and is not output;
in the third mode: allowing the fuel cell to charge the lithium battery, and having braking feedback and sliding feedback; the output power of the fuel cell is stabilized at the maximum efficient output point lower than vcu required power and does not exceed the charge-discharge limit of the lithium battery, and the lithium battery assists in outputting or inputting;
a fourth mode: allowing the fuel cell to charge the lithium battery, and having braking feedback and sliding feedback; the output power of the fuel cell is stabilized at a minimum efficient output point higher than vcu required power and does not exceed the charge-discharge limit of the lithium battery, and the lithium battery assists in outputting or inputting;
a fifth mode: maximum power output of the fuel cell.
3. The fuel cell vehicle power distribution method according to claim 2, characterized in that: in the fourth mode and the fifth mode, vcu the average power required in the set time does not match with the current output power gear of the fuel cell, and the fuel cell adjusts the power output.
4. The fuel cell vehicle power distribution method according to claim 2, characterized in that: the SOC control target percentage comprises a first set percentage, a second set percentage, a third set percentage and a fourth set percentage;
when the SOC is larger than or equal to a first set percentage, the working mode selects a first mode;
when the second set percentage is less than or equal to the SOC < the first set percentage, the working mode selects a second mode;
when the third set percentage is less than or equal to the SOC < the second set percentage, the working mode selects a third mode;
when the fourth set percentage is less than or equal to the SOC < the third set percentage, the working mode selects a fourth mode;
the operating mode selects the fifth mode when SOC < the fourth set percentage.
5. The fuel cell vehicle power distribution method according to claim 4, characterized in that: the first set percentage, the second set percentage, the third set percentage and the fourth set percentage are 95%, 90%, 70% and 40% in sequence.
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| CN113511111A (en) * | 2021-09-01 | 2021-10-19 | 潍柴动力股份有限公司 | Fuel cell system control method, apparatus, device and readable storage medium |
| CN113629279A (en) * | 2021-07-15 | 2021-11-09 | 同济大学 | Method and system for controlling working condition of scaling system of multi-source fuel cell |
| 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 |
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