CN113752919B - Fuel cell automobile energy distribution method and system - Google Patents
Fuel cell automobile energy distribution method and system Download PDFInfo
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- CN113752919B CN113752919B CN202110973911.2A CN202110973911A CN113752919B CN 113752919 B CN113752919 B CN 113752919B CN 202110973911 A CN202110973911 A CN 202110973911A CN 113752919 B CN113752919 B CN 113752919B
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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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- 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
- B60L2250/00—Driver interactions
- B60L2250/26—Driver interactions by pedal actuation
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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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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a fuel cell automobile energy distribution method and a system, and relates to the technical field of fuel cell automobiles.
Description
Technical Field
The invention relates to the technical field of fuel cell automobiles, in particular to an energy distribution method and system for a fuel cell automobile.
Background
The power demand sources of the whole fuel cell automobile generally comprise the current accessory consumption and the current torque demand of the whole automobile, the energy distribution of the fuel cell automobile mainly distributes the energy output of the fuel cell and the power cell according to the power demand of the whole automobile, so that the SOC (state of charge) of the power cell is in a reasonable interval, and the premise of the energy distribution is to determine the required power of the whole automobile.
At present, the whole vehicle demand power can be calculated through the opening degrees of an accelerator pedal and a brake pedal and the vehicle speed, but the traditional method is to divide the vehicle speed into a plurality of sections after receiving an accelerator pedal state signal or a brake pedal state signal, each section corresponds to different whole vehicle demand power, and the dynamic response difference of the whole vehicle demand power is calculated.
Disclosure of Invention
The embodiment of the invention solves the technical problem that the dynamic response of the required power of the whole vehicle is poor in the prior art by calculating the opening degree of an accelerator pedal and a brake pedal and the vehicle speed by providing the energy distribution method and the system of the fuel cell vehicle.
In one aspect, the present invention provides the following technical solutions according to an embodiment of the present invention:
a fuel cell automotive energy distribution method comprising:
judging whether an accelerator pedal state signal and a brake pedal state signal of the fuel cell automobile are received or not;
if one of the accelerator pedal state signal and the brake pedal state signal is received, taking the received state signal as a known state signal, and acquiring the pedal opening and the current vehicle speed in the known state signal;
acquiring a first required power corresponding to the current vehicle speed, a second required power corresponding to the pedal opening and the actual output power of the whole fuel cell vehicle;
performing first PID control on the first required power and the actual output power of the whole vehicle to obtain third required power, and performing second PID control on the second required power and the actual output power of the whole vehicle to obtain fourth required power;
The third required power and the fourth required power are weighted and summed to obtain the whole vehicle required power of the fuel cell automobile;
and determining the output power of the fuel cell and the output power of the power cell according to the whole vehicle required power.
Preferably, the determining the output power of the fuel cell and the output power of the power cell according to the required power of the whole vehicle includes:
acquiring the SOC of the power battery;
and determining the output power of the fuel cell and the output power of the power cell according to the SOC and the whole vehicle required power.
Preferably, after the determining whether the accelerator pedal state signal and the brake pedal state signal of the fuel cell automobile are received, before determining the output power of the fuel cell and the output power of the power cell according to the required power of the whole automobile, the method further includes:
and if the accelerator pedal state signal and the brake pedal state signal are received, setting the required power of the whole vehicle to be zero.
Preferably, after the determining whether the accelerator pedal state signal and the brake pedal state signal of the fuel cell automobile are received, before determining the output power of the fuel cell and the output power of the power cell according to the required power of the whole automobile, the method further includes:
And if the accelerator pedal state signal and the brake pedal state signal are not received, the required power of the whole vehicle is set as the required power obtained by the last calculation.
Preferably, the determining the output power of the fuel cell and the output power of the power cell according to the SOC and the vehicle-specific required power includes:
acquiring the maximum value and the minimum value of the state of charge of the power battery and the rated output power and idle power of the fuel battery;
and determining the output power of the fuel cell and the output power of the power cell according to the SOC, the whole vehicle required power, the state of charge maximum value, the state of charge minimum value, the rated output power and the idle power.
Preferably, the determining the output power of the fuel cell and the output power of the power cell according to the SOC, the vehicle-mounted power demand, the state-of-charge maximum value, the state-of-charge minimum value, the rated output power and the idle power includes:
if the whole vehicle required power is greater than or equal to the rated output power and the SOC is greater than or equal to the maximum state of charge, the output power of the fuel cell is set as the rated output power, and the output power of the power cell is set as the rated discharge power of the power cell;
If the whole vehicle required power is larger than or equal to the idle power and smaller than the rated output power, and the SOC is larger than or equal to the maximum state of charge, the output power of the power battery is set as the rated discharge power, and the whole vehicle required power and the rated discharge power are compared; if the whole vehicle required power is not greater than the rated discharge power, determining the output power of the fuel cell as the idle power; if the whole vehicle required power is larger than the rated discharge power, the output power of the fuel cell is set as the difference value of the whole vehicle required power minus the rated discharge power;
if the whole vehicle required power is greater than or equal to zero and smaller than the idle power and the SOC is greater than or equal to the maximum state of charge, determining the output power of the fuel cell as the idle power and the output power of the power cell as the rated discharge power;
if the whole vehicle required power is greater than or equal to the rated output power, the SOC is greater than or equal to the minimum state of charge and is smaller than the maximum state of charge, the output power of the fuel cell is set as the rated output power, and the output power of the power cell is set as the difference value of the whole vehicle required power minus the rated output power;
If the whole vehicle required power is larger than or equal to the idle power and smaller than the rated output power, and the SOC is larger than or equal to the state-of-charge minimum value and smaller than the state-of-charge maximum value, determining the output power of the fuel cell and the output power of the power cell according to a proportion;
if the vehicle demand power is greater than or equal to zero and less than the idle power, the SOC is greater than or equal to the state of charge minimum value and less than the state of charge maximum value, the output power of the fuel cell is set as the idle power, and the output power of the power cell is set as the difference value of the vehicle demand power minus the idle power;
if the whole vehicle required power is greater than or equal to the rated output power and the SOC is smaller than the state of charge minimum value, the output power of the fuel cell is set to be the rated output power, and the output power of the power cell is set to be the negative rated discharge power;
if the whole vehicle required power is larger than or equal to the idle power and smaller than the rated output power and the SOC is smaller than the minimum value of the state of charge, the output power of the power battery is set to be negative rated discharge power, and the sum of the whole vehicle required power and the rated discharge power is compared with the rated output power; if the sum of the whole vehicle required power and the rated discharge power is larger than the rated output power, the output power of the fuel cell is set as the rated output power; if the sum of the whole vehicle required power and the rated discharge power is not greater than the rated output power, the output power of the fuel cell is set as the sum of the rated discharge power and the whole vehicle required power;
And if the whole vehicle required power is greater than or equal to zero and smaller than the idle power and the SOC is smaller than the state of charge minimum value, the output power of the fuel cell is set as the idle power, and the output power of the power cell is set as the negative rated discharge power.
Preferably, the determining the output power of the fuel cell and the output power of the power cell according to the SOC, the vehicle-mounted power demand, the state-of-charge maximum value, the state-of-charge minimum value, the rated output power and the idle power further includes:
if the whole vehicle required power is smaller than zero and the SOC is larger than or equal to the maximum value of the state of charge, the output power of the fuel cell and the output power of the power cell are both set to be zero;
if the whole vehicle required power is smaller than zero, the SOC is larger than or equal to the minimum state of charge and smaller than the maximum state of charge, the output power of the fuel cell is set to be zero, and the absolute value of the whole vehicle required power and the smaller value of the rated discharge power are obtained; setting the output power of the power battery to the negative smaller value before the SOC reaches the state of charge maximum value;
And if the whole vehicle required power is smaller than zero and the SOC is smaller than the state of charge minimum value, setting the output power of the fuel cell to be zero, and setting the output power of the power cell to be negative rated discharge power before the SOC reaches the state of charge minimum value.
On the other hand, the invention also provides the following technical scheme:
a fuel cell automotive energy distribution system comprising:
the signal judging module is used for judging whether an accelerator pedal state signal and a brake pedal state signal of the fuel cell automobile are received or not;
the parameter acquisition module is used for taking the received state signal as a known state signal if one of the accelerator pedal state signal and the brake pedal state signal is received, and acquiring the pedal opening and the current vehicle speed in the known state signal;
the power acquisition module is used for acquiring the first required power corresponding to the current vehicle speed, the second required power corresponding to the pedal opening degree and the actual output power of the whole fuel cell automobile;
the PID control module is used for performing first PID control on the first required power and the actual output power of the whole vehicle to obtain third required power, and performing second PID control on the second required power and the actual output power of the whole vehicle to obtain fourth required power;
The power calculation module is used for carrying out weighted summation on the third required power and the fourth required power to obtain the whole vehicle required power of the fuel cell automobile;
and the power distribution module is used for determining the output power of the fuel cell and the output power of the power cell according to the whole vehicle required power.
On the other hand, the invention also provides the following technical scheme:
an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing any one of the fuel cell vehicle energy distribution methods described above when executing the program.
On the other hand, the invention also provides the following technical scheme:
a computer readable storage medium that when executed implements any of the fuel cell vehicle energy distribution methods described above.
One or more technical solutions provided in the embodiments of the present invention at least have the following technical effects or advantages:
in the embodiment of the invention, whether an accelerator pedal state signal and a brake pedal state signal of a fuel cell automobile are received or not is judged; if one of an accelerator pedal state signal and a brake pedal state signal is received, taking the received state signal as a known state signal, and acquiring the pedal opening degree and the current vehicle speed in the known state signal; acquiring a first required power corresponding to the current vehicle speed, a second required power corresponding to the pedal opening and the actual output power of the whole fuel cell automobile; performing first PID control on the first required power and the actual output power of the whole vehicle to obtain third required power, and performing second PID control on the second required power and the actual output power of the whole vehicle to obtain fourth required power; the third required power and the fourth required power are weighted and summed to obtain the whole vehicle required power of the fuel cell automobile; and determining the output power of the fuel cell and the output power of the power cell according to the required power of the whole vehicle. In the process of calculating the required power of the whole vehicle according to the current vehicle speed and the opening degree of the accelerator pedal or the current vehicle speed and the opening degree of the brake pedal, the vehicle speed is not divided into a plurality of sections, and the required power of the whole vehicle is obtained through feedforward and PID feedback control, so that the dynamic response performance is better and the stability is kept higher.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a fuel cell vehicle energy distribution method according to an embodiment of the present invention;
fig. 2 is a block diagram of a fuel cell vehicle energy distribution system in accordance with an embodiment of the present invention.
Reference numerals illustrate:
601-a signal judgment module; 602-a parameter acquisition module; 603-a power acquisition module; 604-a PID control module; 605-a power calculation module; 606-a power distribution module.
Detailed Description
The embodiment of the invention solves the technical problem that the dynamic response of the required power of the whole vehicle is poor in the prior art by calculating the opening degree of an accelerator pedal and a brake pedal and the vehicle speed by providing the energy distribution method and the system of the fuel cell vehicle.
In order to better understand the technical scheme of the present invention, the following detailed description will refer to the accompanying drawings and specific embodiments.
First, the term "and/or" appearing herein is merely an association relationship describing associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
As shown in fig. 1, the fuel cell vehicle energy distribution method of the present embodiment includes:
step S10, judging whether an accelerator pedal state signal and a brake pedal state signal of the fuel cell automobile are received or not;
step S20, if one of an accelerator pedal state signal and a brake pedal state signal is received, taking the received state signal as a known state signal, and acquiring the pedal opening degree and the current vehicle speed in the known state signal;
step S21, obtaining a first required power corresponding to the current vehicle speed, a second required power corresponding to the pedal opening degree and the actual output power of the whole fuel cell automobile;
step S22, performing a first PID control on the first required power and the actual output power of the whole vehicle to obtain a third required power, and performing a second PID control on the second required power and the actual output power of the whole vehicle to obtain a fourth required power;
Step S23, carrying out weighted summation on the third required power and the fourth required power to obtain the whole vehicle required power of the fuel cell automobile;
and step S30, determining the output power of the fuel cell and the output power of the power cell according to the required power of the whole vehicle.
In step S20, if one of the accelerator pedal state signal and the brake pedal state signal is received, this represents that only the accelerator pedal state signal or only the brake pedal state signal is received. The received accelerator pedal state signal represents that the driver steps on the accelerator pedal, the received brake pedal state signal represents that the driver steps on the brake pedal, and if only the accelerator pedal state signal is received, the known state signal is the accelerator pedal state signal, and the pedal opening in the known state signal is the accelerator pedal opening in the accelerator pedal state signal; if only the brake pedal state signal is received, the known state signal is a brake pedal state signal, and the pedal opening in the known state signal is the brake pedal opening in the brake pedal state signal.
In step S21, a table in which the vehicle speed corresponds to the first required power one by one may be constructed according to the test calibration, and a table in which the accelerator pedal opening or the brake pedal opening corresponds to the second required power one by one may be constructed, where the two tables may be adjusted.
In step S22, the third required power is the required power of the whole vehicle obtained by taking the vehicle speed into consideration, and the fourth required power is the required power of the whole vehicle obtained by taking the accelerator pedal opening or the brake pedal opening into consideration. Because the input of PID control considers the actual output power of the whole vehicle, the third required power and the fourth required power are both close to the actual output power of the whole vehicle.
In step S23, the weighted summation of the third demand power and the fourth demand power is performed to obtain the demand power of the whole vehicle, which may include:psp is the power required by the whole vehicle, wp is the weight of the fourth power required, psp_ap is the fourth power required, wv is the weight of the third power required, psp_vp is the third power required, and Wp and Wv can be adjusted according to the test. In this way, the calculation of the whole vehicle required power according to the current vehicle speed and the opening degree of the accelerator pedal can be realized according to the steps S341 to S343, orAnd the driver calculates the required power of the whole vehicle according to the current vehicle speed and the opening degree of the brake pedal, and the obtained required power of the whole vehicle is more reasonable.
In the process of calculating the required power of the whole vehicle according to the current vehicle speed and the opening of the accelerator pedal or the current vehicle speed and the opening of the brake pedal, the vehicle speed is not divided into a plurality of sections, the required power of the whole vehicle is obtained through feedforward and PID feedback control, the dynamic response performance is better, and the stability can be kept higher.
According to the embodiment, the whole vehicle demand power can be calculated only according to the opening degree of the accelerator pedal, for example, the whole vehicle demand power is in direct proportion to the opening degree of the accelerator pedal, but when the vehicle speed is high, if the vehicle speed reaches 100km/h, if the stepping depth of the accelerator pedal is 80%, the whole vehicle demand power determined only according to the opening degree of the accelerator pedal can be increased, so that the vehicle speed is further increased, the safety risk is increased, and the fact that the whole vehicle demand power determined only according to the opening degree of the accelerator pedal at the moment is unreasonable is shown. The current vehicle speed is considered when the required power of the whole vehicle is determined, the situation that the vehicle speed is further improved due to the required power of the whole vehicle when the vehicle speed is high is avoided, and the safety risk is reduced.
After the power required by the whole vehicle is determined, the embodiment determines the output power of the fuel cell and the output power of the power cell according to the SOC of the power cell and the power requirement of the whole vehicle, so that the SOC of the power cell is in a reasonable interval. For this purpose, step S30 comprises: acquiring the SOC of the power battery; and determining the output power of the fuel cell and the output power of the power cell according to the SOC of the power cell and the required power of the whole vehicle.
It is easy to think that the determination result in step S10 includes, in addition to only the accelerator pedal state signal or only the accelerator pedal state signal, receiving both the accelerator pedal state signal and the brake pedal state signal, and neither the accelerator pedal state signal nor the brake pedal state signal, and it is necessary to determine the power required for the whole vehicle in both cases. For this reason, after step S10 and before step S30, the fuel cell vehicle energy distribution method of the present embodiment further includes:
If the accelerator pedal state signal and the brake pedal state signal are received, the required power of the whole vehicle is set to be zero;
and if the accelerator pedal state signal and the brake pedal state signal are not received, the required power of the whole vehicle is set as the required power obtained by the last calculation.
In the running process of the automobile, the situation that the driver misoperates and simultaneously steps on the accelerator pedal and the brake pedal exists, the driving intention of the driver is uncertain, the traditional method cannot give reasonable whole automobile required power under the situation, the driving state of the automobile can be possibly changed towards the direction opposite to the driving intention, and potential safety hazards exist. If the accelerator pedal state signal and the brake pedal state signal are received, the driver simultaneously steps on the accelerator pedal and the brake pedal. According to the embodiment, under the condition that the driver simultaneously steps on the accelerator pedal and the brake pedal, the whole vehicle required power of the fuel cell automobile is set to be zero, which is equivalent to basically not providing output power, so that the driving state of the automobile is basically not changed, the driving state of the automobile is not changed towards the direction opposite to the driving intention of the driver, and the potential safety hazard caused by unreasonable determination of the whole vehicle required power is eliminated.
For the situation that the accelerator pedal state signal and the brake pedal state signal are not received, the driver does not step on the accelerator pedal or the brake pedal at the moment, so that the driving intention of the driver is unknown, the potential safety hazard can be caused by changing the required power of the whole vehicle, and the embodiment keeps the required power of the whole vehicle to be the required power at the last moment under the condition, so that the driving state of the vehicle can be kept continuous, and the potential hazard caused by suddenly changing the driving state of the vehicle is avoided. The required power of the whole vehicle is generally determined periodically, and the required power obtained by the last calculation can be the required power of the whole vehicle determined in the last period.
In this embodiment, determining the output power of the fuel cell and the output power of the power cell according to the SOC of the power cell and the power required by the whole vehicle includes: acquiring the maximum value and the minimum value of the state of charge of the power battery and the rated output power and idle power of the fuel battery; and determining the output power of the fuel cell and the output power of the power cell according to the SOC, the whole vehicle required power, the maximum state of charge, the minimum state of charge, the rated output power and the idle power.
Specifically, determining the output power of the fuel cell and the output power of the power cell according to the SOC, the vehicle-mounted power demand, the state-of-charge maximum, the state-of-charge minimum, the rated output power and the idle power includes:
if the required power of the whole vehicle is greater than or equal to the rated output power and the SOC is greater than or equal to the maximum value of the charge state, the power battery needs to be discharged at the moment, and the output power of the fuel battery and the power battery are required to be output simultaneously, the output power of the fuel battery is set to be the rated output power, the output power of the power battery is set to be the rated discharge power of the power battery, and the actual output power of the whole vehicle is the sum of the rated output power and the rated discharge power;
if the required power of the whole vehicle is larger than or equal to the idle power of the fuel cell, smaller than the rated output power and the SOC is larger than or equal to the maximum value of the charge state, the power cell needs to discharge at the moment, the output power of the power cell is set as the rated discharge power, and the required power of the whole vehicle is compared with the rated discharge power; if the power required by the whole vehicle is not greater than the rated discharge power, the power required by the whole vehicle can be met only by the output power of the power battery, the output power of the fuel battery is set as the idle power of the fuel battery, and the actual output power of the whole vehicle is the sum of the idle power and the rated discharge power of the fuel battery; if the required power of the whole vehicle is larger than the rated discharge power, the condition that the required power of the whole vehicle cannot be met by only depending on the output power of the power battery is indicated, and the fuel battery is required to output power, the output power of the fuel battery is defined as the difference value of the required power of the whole vehicle minus the rated discharge power, and the actual output power of the whole vehicle is the required power of the whole vehicle;
If the required power of the whole vehicle is greater than or equal to zero and less than the idle power, and the SOC is greater than or equal to the maximum state of charge, the power battery needs to be discharged at the moment, the output power of the fuel battery is set as the idle power, the output power of the power battery is set as the rated discharge power, and the actual output power of the whole vehicle is the sum of the idle power and the rated discharge power;
if the required power of the whole vehicle is larger than or equal to the rated output power, the SOC is larger than or equal to the minimum value of the state of charge and smaller than the maximum value of the state of charge, which indicates that the SOC of the power battery is in a reasonable interval and the fuel battery and the power battery are required to output power simultaneously, the output power of the fuel battery is set as the rated output power, the output power of the power battery is set as the difference value of the required power of the whole vehicle minus the rated output power, and the actual output power of the whole vehicle is the required power of the whole vehicle;
if the required power of the whole vehicle is greater than or equal to the idle power and less than the rated output power, and the SOC is greater than or equal to the minimum state of charge and less than the maximum state of charge, which indicates that the SOC of the power battery is in a reasonable interval, determining the output power of the fuel battery and the output power of the power battery according to a proportion, wherein the specific proportion comprises Pfc=Prate/(Prate+pdisch): psp, pbat=pdisch/(Prate+pdisch), wherein Pfc is the output power of the fuel battery, prate is the rated output power of the fuel battery, pdisch is the rated discharge power of the power battery, psp is the required power of the whole vehicle, and Pbat is the output power of the power battery, and at this moment, the actual output power of the whole vehicle is the required power of the whole vehicle;
If the vehicle demand power is greater than or equal to zero and less than the idle power, and the SOC is greater than or equal to the minimum state of charge and less than the maximum state of charge, indicating that the SOC of the power battery is in a reasonable interval, determining the output power of the fuel battery as the idle power, determining the output power of the power battery as the difference value of the vehicle demand power minus the idle power, wherein the difference value of the vehicle demand power minus the idle power is necessarily less than zero because the vehicle demand power can be met only by the idle power, charging the power battery by taking the difference value of the idle power minus the vehicle demand power as the charging power, and the actual output power of the vehicle is the difference value of the idle power minus the charging power of the power battery, namely the vehicle demand power;
if the required power of the whole vehicle is greater than or equal to the rated output power and the SOC is smaller than the minimum value of the charge state, at the moment, the power battery needs to be charged, the output power of the fuel battery is set to be the rated output power, the output power of the power battery is set to be negative rated discharge power, namely, the power battery is charged by taking the rated discharge power as the charging power, and as the output power of the fuel battery needs to meet the charging of the power battery preferentially, the actual output power of the whole vehicle is the difference value of the rated output power of the fuel battery minus the rated discharge power of the power battery, and is necessarily smaller than the required power of the whole vehicle;
If the required power of the whole vehicle is larger than or equal to the idle power and smaller than the rated output power and the SOC is smaller than the minimum value of the charge state, the power battery needs to be charged at the moment, and the output power of the fuel battery needs to be preferentially met with the charging of the power battery, the output power of the power battery is set to be negative rated discharge power, namely the power battery is charged by taking the rated discharge power as the charging power, and the sum of the required power of the whole vehicle plus the rated discharge power and the rated output power are compared; if the sum of the required power and the rated discharge power of the whole vehicle is larger than the rated output power, the rated output power cannot meet the required power of the whole vehicle after the power battery is charged, the output power of the fuel battery can only be set as the rated output power, and the actual output power of the whole vehicle is the difference value of the rated output power minus the rated discharge power; if the sum of the total vehicle demand power and the rated discharge power is not greater than the rated output power, the rated output power can meet the total vehicle demand power after meeting the charging of the power battery, the output power of the fuel battery is set as the sum of the rated discharge power and the total vehicle demand power, and the actual output power of the total vehicle is the total vehicle demand power at the moment;
If the required power of the whole vehicle is greater than or equal to zero and smaller than the idle power and the SOC is smaller than the minimum value of the charge state, the power battery needs to be charged at the moment, the output power of the fuel battery is set as the idle power, the output power of the power battery is set as the negative rated discharge power, and the idle power needs to preferentially meet the charging of the power battery, so that the actual output power of the whole vehicle is the difference of the idle power minus the rated discharge power at the moment;
if the required power of the whole vehicle is smaller than zero and the SOC is larger than or equal to the maximum value of the charge state, the output power of the fuel cell and the output power of the power cell are both set to be zero;
if the required power of the whole vehicle is smaller than zero, the SOC is larger than or equal to the minimum value of the state of charge and smaller than the maximum value of the state of charge, the output power of the fuel cell is set to be zero, and the absolute value of the required power of the whole vehicle and the smaller value of the rated discharge power are obtained; setting the output power of the power battery to a negative smaller value before the SOC reaches the state of charge maximum;
if the required power of the whole vehicle is smaller than zero and the SOC is smaller than the minimum state of charge, the output power of the fuel cell is set to be zero, and the output power of the power cell is set to be negative rated discharge power before the SOC reaches the minimum state of charge.
The vehicle demand power is greater than or equal to zero when only the accelerator pedal state signal and only the brake pedal state signal are received, but less than zero when only the brake pedal state signal is received. When the power required by the whole vehicle is less than zero, the power battery is required to recover braking energy and shut down the fuel cell system, and setting the output power of the fuel cell to zero represents shutting down the fuel cell system. Three conditions exist when the required power of the whole vehicle is less than zero: the SOC is larger than or equal to the maximum value of the charge state, so that the power battery is healthy, the power battery cannot be charged at the moment, and the brake pad consumes brake energy; the SOC is larger than or equal to the minimum value of the state of charge and smaller than the maximum value of the state of charge, and at the moment, the power battery is charged by taking the smaller value of the whole vehicle required power and rated discharge power as charging power, so that the power battery can be prevented from being charged and exploded; the SOC is smaller than the minimum value of the state of charge, so that the power battery is healthy, the SOC needs to be quickly increased to the minimum value of the state of charge, and the power battery is charged by taking rated discharge power as charging power at the moment, so that the SOC can be quickly increased to the minimum value of the state of charge.
The implementation can also set the output power of the fuel cell to zero when the required power of the whole vehicle is greater than or equal to zero and less than the idle power, but frequent shutdown can damage the service life of the fuel cell system, while the embodiment preferably sets the output power of the fuel cell to the idle power when the required power of the whole vehicle is greater than or equal to zero and less than the idle power, so that the fuel cell works between the idle power and the rated output power as much as possible, frequent shutdown of the fuel cell system is avoided, the service life of the fuel cell system is prolonged,
when determining the output power of the power battery, the embodiment selects to divide the SOC of the power battery into three sections, which are smaller than the minimum state of charge, between the minimum state of charge and the maximum state of charge, and greater than or equal to the maximum state of charge, and determines the output power of the power battery according to the section where the SOC of the power battery is located, and generally can divide the SOC of the power battery into more sections, but can cause discontinuous operation of the power battery, and only divide the SOC of the power battery into three sections, so that the operation of the power battery can be more continuous.
As shown in fig. 2, the present embodiment further provides a fuel cell vehicle energy distribution system, including:
The signal judging module 601 is configured to judge whether an accelerator pedal state signal and a brake pedal state signal of the fuel cell automobile are received;
the parameter obtaining module 602 is configured to, if one of an accelerator pedal state signal and a brake pedal state signal is received, obtain a pedal opening and a current vehicle speed in the known state signal by using the received state signal as the known state signal;
the power obtaining module 603 is configured to obtain a first required power corresponding to a current vehicle speed, a second required power corresponding to a pedal opening, and an actual output power of the whole fuel cell vehicle;
the PID control module 604 is configured to perform a first PID control on the first required power and the actual output power of the whole vehicle to obtain a third required power, and perform a second PID control on the second required power and the actual output power of the whole vehicle to obtain a fourth required power;
the power calculation module 605 is configured to perform weighted summation on the third required power and the fourth required power to obtain the overall required power of the fuel cell automobile;
the power distribution module 606 is configured to determine an output power of the fuel cell and an output power of the power cell according to the required power of the whole vehicle.
In the process of calculating the required power of the whole vehicle according to the current vehicle speed and the opening of the accelerator pedal or the current vehicle speed and the opening of the brake pedal, the vehicle speed is not divided into a plurality of sections, the required power of the whole vehicle is obtained through feedforward and PID feedback control, the dynamic response performance is better, and the stability can be kept higher.
Based on the same inventive concept as the fuel cell vehicle energy distribution method described above, the present embodiment also provides an electronic device including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any one of the fuel cell vehicle energy distribution methods described above when executing the program.
Where a bus architecture (represented by a bus), a bus may comprise any number of interconnected buses and bridges, linking together various circuits, including one or more processors, as represented by a processor, and a memory, as represented by a memory. The bus may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., as are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface between the bus and the receiver and transmitter. The receiver and the transmitter may be the same element, i.e. a transceiver, providing a unit for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus and general processing, while the memory may be used to store data used by the processor in performing operations.
Since the electronic device described in this embodiment is an electronic device used to implement the method for distributing energy of a fuel cell vehicle in this embodiment, those skilled in the art will be able to understand the specific implementation of the electronic device and various modifications thereof based on the method for distributing energy of a fuel cell vehicle described in this embodiment, so that a detailed description of how the electronic device is implemented in this embodiment will not be provided herein. Any electronic device used by those skilled in the art to implement the method for distributing energy of a fuel cell vehicle according to the embodiments of the present invention falls within the scope of the present invention.
Based on the same inventive concept as the fuel cell vehicle energy distribution method described above, the present invention also provides a computer-readable storage medium that when executed implements any of the fuel cell vehicle energy distribution methods described above.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention 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. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A fuel cell vehicle energy distribution method, comprising:
Judging whether an accelerator pedal state signal and a brake pedal state signal of the fuel cell automobile are received or not;
if one of the accelerator pedal state signal and the brake pedal state signal is received, taking the received state signal as a known state signal, and acquiring the pedal opening and the current vehicle speed in the known state signal;
acquiring a first required power corresponding to the current vehicle speed, a second required power corresponding to the pedal opening and the actual output power of the whole fuel cell vehicle;
performing first PID control on the first required power and the actual output power of the whole vehicle to obtain third required power, and performing second PID control on the second required power and the actual output power of the whole vehicle to obtain fourth required power;
the third required power and the fourth required power are weighted and summed to obtain the whole vehicle required power of the fuel cell automobile;
and determining the output power of the fuel cell and the output power of the power cell according to the whole vehicle required power.
2. The fuel cell vehicle energy distribution method according to claim 1, wherein the determining the output power of the fuel cell and the output power of the power cell according to the vehicle demand power includes:
Acquiring the SOC of the power battery;
and determining the output power of the fuel cell and the output power of the power cell according to the SOC and the whole vehicle required power.
3. The method for distributing energy to a fuel cell vehicle according to claim 1, wherein after said determining whether an accelerator pedal state signal and a brake pedal state signal of the fuel cell vehicle are received, before said determining the output power of the fuel cell and the output power of the power cell according to the power demand of the whole vehicle, further comprises:
and if the accelerator pedal state signal and the brake pedal state signal are received, setting the required power of the whole vehicle to be zero.
4. The method for distributing energy to a fuel cell vehicle according to claim 1, wherein after said determining whether an accelerator pedal state signal and a brake pedal state signal of the fuel cell vehicle are received, before said determining the output power of the fuel cell and the output power of the power cell according to the power demand of the whole vehicle, further comprises:
and if the accelerator pedal state signal and the brake pedal state signal are not received, the required power of the whole vehicle is set as the required power obtained by the last calculation.
5. The fuel cell vehicle energy distribution method according to claim 2, wherein the determining the output power of the fuel cell and the output power of the power cell according to the SOC and the vehicle-whole required power includes:
acquiring the maximum value and the minimum value of the state of charge of the power battery and the rated output power and idle power of the fuel battery;
and determining the output power of the fuel cell and the output power of the power cell according to the SOC, the whole vehicle required power, the state of charge maximum value, the state of charge minimum value, the rated output power and the idle power.
6. The fuel cell vehicle energy distribution method according to claim 5, wherein the determining the output power of the fuel cell and the output power of the power cell based on the SOC, the vehicle-mounted power demand, the state-of-charge maximum value, the state-of-charge minimum value, the rated output power, and the idle power includes:
if the whole vehicle required power is greater than or equal to the rated output power and the SOC is greater than or equal to the maximum state of charge, the output power of the fuel cell is set as the rated output power, and the output power of the power cell is set as the rated discharge power of the power cell;
If the whole vehicle required power is larger than or equal to the idle power and smaller than the rated output power, and the SOC is larger than or equal to the maximum state of charge, the output power of the power battery is set as the rated discharge power, and the whole vehicle required power and the rated discharge power are compared; if the whole vehicle required power is not greater than the rated discharge power, determining the output power of the fuel cell as the idle power; if the whole vehicle required power is larger than the rated discharge power, the output power of the fuel cell is set as the difference value of the whole vehicle required power minus the rated discharge power;
if the whole vehicle required power is greater than or equal to zero and smaller than the idle power and the SOC is greater than or equal to the maximum state of charge, determining the output power of the fuel cell as the idle power and the output power of the power cell as the rated discharge power;
if the whole vehicle required power is greater than or equal to the rated output power, the SOC is greater than or equal to the minimum state of charge and is smaller than the maximum state of charge, the output power of the fuel cell is set as the rated output power, and the output power of the power cell is set as the difference value of the whole vehicle required power minus the rated output power;
If the whole vehicle required power is larger than or equal to the idle power and smaller than the rated output power, and the SOC is larger than or equal to the state-of-charge minimum value and smaller than the state-of-charge maximum value, determining the output power of the fuel cell and the output power of the power cell according to a proportion;
if the vehicle demand power is greater than or equal to zero and less than the idle power, the SOC is greater than or equal to the state of charge minimum value and less than the state of charge maximum value, the output power of the fuel cell is set as the idle power, and the output power of the power cell is set as the difference value of the vehicle demand power minus the idle power;
if the whole vehicle required power is greater than or equal to the rated output power and the SOC is smaller than the state of charge minimum value, the output power of the fuel cell is set to be the rated output power, and the output power of the power cell is set to be the negative rated discharge power;
if the whole vehicle required power is larger than or equal to the idle power and smaller than the rated output power and the SOC is smaller than the minimum value of the state of charge, the output power of the power battery is set to be negative rated discharge power, and the sum of the whole vehicle required power and the rated discharge power is compared with the rated output power; if the sum of the whole vehicle required power and the rated discharge power is larger than the rated output power, the output power of the fuel cell is set as the rated output power; if the sum of the whole vehicle required power and the rated discharge power is not greater than the rated output power, the output power of the fuel cell is set as the sum of the rated discharge power and the whole vehicle required power;
And if the whole vehicle required power is greater than or equal to zero and smaller than the idle power and the SOC is smaller than the state of charge minimum value, the output power of the fuel cell is set as the idle power, and the output power of the power cell is set as the negative rated discharge power.
7. The fuel cell vehicle energy distribution method according to claim 6, wherein the determining the output power of the fuel cell and the output power of the power cell based on the SOC, the vehicle-mounted required power, the state-of-charge maximum value, the state-of-charge minimum value, the rated output power, and the idle power, further comprises:
if the whole vehicle required power is smaller than zero and the SOC is larger than or equal to the maximum value of the state of charge, the output power of the fuel cell and the output power of the power cell are both set to be zero;
if the whole vehicle required power is smaller than zero, the SOC is larger than or equal to the minimum state of charge and smaller than the maximum state of charge, the output power of the fuel cell is set to be zero, and the absolute value of the whole vehicle required power and the smaller value of the rated discharge power are obtained; setting the output power of the power battery to the negative smaller value before the SOC reaches the state of charge maximum value;
And if the whole vehicle required power is smaller than zero and the SOC is smaller than the state of charge minimum value, setting the output power of the fuel cell to be zero, and setting the output power of the power cell to be negative rated discharge power before the SOC reaches the state of charge minimum value.
8. A fuel cell automotive energy distribution system, comprising:
the signal judging module is used for judging whether an accelerator pedal state signal and a brake pedal state signal of the fuel cell automobile are received or not;
the parameter acquisition module is used for taking the received state signal as a known state signal if one of the accelerator pedal state signal and the brake pedal state signal is received, and acquiring the pedal opening and the current vehicle speed in the known state signal;
the power acquisition module is used for acquiring the first required power corresponding to the current vehicle speed, the second required power corresponding to the pedal opening degree and the actual output power of the whole fuel cell automobile;
the PID control module is used for performing first PID control on the first required power and the actual output power of the whole vehicle to obtain third required power, and performing second PID control on the second required power and the actual output power of the whole vehicle to obtain fourth required power;
The power calculation module is used for carrying out weighted summation on the third required power and the fourth required power to obtain the whole vehicle required power of the fuel cell automobile;
and the power distribution module is used for determining the output power of the fuel cell and the output power of the power cell according to the whole vehicle required power.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the fuel cell vehicle energy distribution method of any one of claims 1-7 when the program is executed.
10. A computer readable storage medium, which when executed implements the fuel cell vehicle energy distribution method of any one of claims 1-7.
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