CN111845462B - Fuel cell power distribution control method - Google Patents
Fuel cell power distribution control method Download PDFInfo
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- CN111845462B CN111845462B CN202010639293.3A CN202010639293A CN111845462B CN 111845462 B CN111845462 B CN 111845462B CN 202010639293 A CN202010639293 A CN 202010639293A CN 111845462 B CN111845462 B CN 111845462B
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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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/10—Vehicle control parameters
- B60L2240/12—Speed
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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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Abstract
The invention discloses a power distribution control method of a fuel cell, which comprises the following steps: step one, judging whether the vehicle is started, if so, entering a step two; otherwise, the fuel cell does not output power; step two, acquiring the running time after the vehicle is started, judging whether the running time after the vehicle is started reaches a first preset time, if so, controlling the fuel cell to start outputting power and controlling the output power of the fuel cell to gradually increase to the first preset power, and entering step three; otherwise, the fuel cell does not output power; and step three, acquiring the SOC value, the vehicle speed and the residual hydrogen amount of the battery, and switching the output power state of the fuel battery based on the acquired SOC value, the vehicle speed and the residual hydrogen amount of the battery. The fuel cell power distribution control method provided by the invention realizes the power distribution of the fuel cell according to the working condition of the vehicle, thereby coordinating and distributing the power output of the fuel cell and the power cell, and improving the stability, safety, durability and economic performance of a power system.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a power distribution control method of a fuel cell.
Background
The basic structure of the current hydrogen fuel powered vehicle is similar to that of a pure electric vehicle, wherein the design of a transmission system, a running system, a steering system and a braking system is basically consistent. The driving motor provides power for the whole vehicle, and the power battery and the fuel cell system provide electric energy for the driving motor. Compared with a pure electric vehicle, the hydrogen fuel powered vehicle has smaller power battery capacity, can realize quick charging, and even does not need charging.
And in the driving process, the fuel cell system is controlled to output different powers according to the working condition of the whole vehicle, so that the driving working modes of lithium electricity, hydrogen electricity, hybrid driving in an electric energy hybrid mode, fuel cell driving and the like are realized. The hydrogen-fueled power system is a highly efficient power generation device that directly converts chemical energy into electrical energy without undergoing combustion. Because the hydrogen fuel cell has a slow response and must work with the power cell to meet the power requirements of the vehicle under different working conditions, a control strategy is further needed to coordinate and distribute the power output of the fuel cell and the power cell. Control strategies may directly impact the stability, safety, durability, and economic performance of the powertrain. Therefore, it is necessary to realize the power distribution control of the fuel cell according to the operating condition of the vehicle.
Disclosure of Invention
In order to achieve the technical purpose, the invention provides a power distribution control method of a fuel cell, which comprises the following specific technical scheme:
a fuel cell power distribution control method, comprising:
step one, judging whether the vehicle is started, if so, entering a step two; otherwise, the fuel cell does not output power;
step two, acquiring the running time after the vehicle is started, judging whether the running time after the vehicle is started reaches a first preset time, if so, controlling the fuel cell to start outputting power and controlling the output power of the fuel cell to gradually increase to the first preset power, and entering step three; otherwise, the fuel cell does not output power;
and step three, switching the output power state of the fuel cell based on the SOC value of the battery, the vehicle speed and the residual hydrogen amount.
In some embodiments, the output power state of the fuel cell and the switching process between the output power states are as follows:
the first state is that the fuel cell outputs at a first preset power, the SOC value, the vehicle speed and the residual hydrogen amount of the battery are obtained, and the output state of the fuel cell is switched according to the obtained SOC value, the vehicle speed and the residual hydrogen amount as follows: when the SOC value of the battery is larger than the SOC value of the fifth battery or the residual hydrogen amount is equal to zero, switching to a state two; when the SOC value of the battery is greater than the SOC value of the third battery, the vehicle speed is greater than the first preset vehicle speed and less than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a third state; when the SOC value of the battery is smaller than the SOC value of the first battery and the residual hydrogen amount is larger than zero, switching to a state four; when the SOC value of the battery is smaller than the SOC value of the second battery, the vehicle speed is greater than a first preset vehicle speed, and the residual hydrogen quantity is greater than zero, switching to a fifth state;
and secondly, stopping power output of the fuel cell, acquiring a cell SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired cell SOC value, the vehicle speed and the residual hydrogen amount as follows: entering a first state when the SOC value of the battery is smaller than the SOC value of the fourth battery, the vehicle speed is smaller than a first preset vehicle speed, and the residual hydrogen quantity is larger than zero; when the SOC value of the battery is smaller than the SOC value of the fourth battery, the vehicle speed is greater than the first preset vehicle speed and smaller than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a third state; when the SOC value of the battery is smaller than the SOC value of the fourth battery, the vehicle speed is larger than a second preset vehicle speed, and the residual hydrogen quantity is larger than zero, switching to a state four;
and thirdly, outputting the fuel cell at a second preset power, acquiring the SOC value, the vehicle speed and the residual hydrogen amount of the fuel cell, and switching the output state of the fuel cell based on the acquired SOC value, the vehicle speed and the residual hydrogen amount as follows: when the SOC value of the battery is larger than the first SOC value and smaller than the fourth SOC value, the vehicle speed is smaller than a first preset vehicle speed, and the residual hydrogen amount is larger than zero, switching to a first state; when the SOC value of the battery is larger than the SOC value of the fifth battery or the residual hydrogen amount is equal to zero, switching to a state two; when the SOC value of the battery is larger than the SOC value of the first battery and smaller than the SOC value of the fourth battery, the vehicle speed is larger than a second preset vehicle speed, and the residual hydrogen amount is larger than zero, switching to a state four; and when the SOC value of the battery is smaller than the second SOC value of the battery, the vehicle speed is greater than the first preset vehicle speed and smaller than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a fifth state.
And fourthly, outputting the fuel cell at rated maximum output power, acquiring a cell SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired cell SOC value, the vehicle speed and the residual hydrogen amount as follows: when the SOC value of the battery is larger than the first SOC value of the battery, the vehicle speed is smaller than a first preset vehicle speed, and the residual hydrogen quantity is larger than zero, switching to a first state; when the battery SOC value is larger than the first battery SOC value and smaller than the second battery SOC value, the vehicle speed is larger than the first preset vehicle speed and smaller than the second preset vehicle speed, and the residual hydrogen amount is larger than zero, switching to a fifth state; when the SOC value of the battery is greater than the SOC value of the third battery, the vehicle speed is greater than the first preset vehicle speed and less than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a third state; when the SOC value of the battery is larger than the SOC value of the fifth battery or the residual hydrogen amount is equal to zero, switching to a state two;
and outputting the fuel cell at a third preset power, acquiring the SOC value, the vehicle speed and the residual hydrogen quantity of the fuel cell, and switching the output state of the fuel cell based on the acquired SOC value, the vehicle speed and the residual hydrogen quantity as follows: when the SOC value of the battery is larger than the first SOC value of the battery, the vehicle speed is smaller than a first preset vehicle speed, and the residual hydrogen quantity is larger than zero, switching to a first state; when the SOC value of the battery is greater than the SOC value of the third battery, the vehicle speed is greater than the first preset vehicle speed and less than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a third state; when the SOC value of the battery is smaller than the SOC value of the first battery or the vehicle speed is larger than a second preset vehicle speed and the residual hydrogen quantity is larger than zero, switching to a state four; when the residual hydrogen amount is equal to zero, switching to a state two;
wherein:
the first predetermined power is less than the second predetermined power, the second predetermined power is less than the third predetermined power, and the third predetermined power is less than the rated maximum output power of the fuel cell;
the first battery SOC value is smaller than the second battery SOC value, the second battery SOC value is smaller than the third battery SOC value, the third battery SOC value is smaller than the fourth battery SOC value, and the fourth battery SOC value is smaller than the fifth battery SOC value.
In some embodiments, the output power of the fuel cell is increased to the first predetermined power when a running period after the start of the vehicle reaches a second predetermined period, wherein: the second predetermined length of time is greater than the first predetermined length of time.
In some embodiments, the output power of the fuel cell is gradually increased to the first predetermined power according to a linear increasing rule.
In some embodiments, the first predetermined power is one third of the rated maximum output power of the fuel cell, the second predetermined power is one half of the rated maximum output power of the fuel cell, and the third predetermined power is two thirds of the rated maximum output power of the fuel cell.
In some embodiments, the first battery SOC value is 0.4, the second battery SOC value is 0.75, the third battery SOC value is 0.76, the fourth battery SOC value is 0.83, and the fifth battery SOC value is 0.85.
Compared with the prior art, the fuel cell power distribution control method provided by the invention realizes the power distribution of the fuel cell according to the working condition of the vehicle, so that the power output of the fuel cell and the power cell is coordinated and distributed, and the stability, the safety, the durability and the economic performance of a power system are improved.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings.
Fig. 1 is a flow chart showing a fuel cell power distribution control method 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.
Referring to fig. 1, it is a flow chart of a fuel cell power distribution control method according to an embodiment of the present invention, where the control method includes:
s1, judging whether the vehicle is started or not, and if so, entering S2; otherwise, the fuel cell does not output power.
S2, obtaining the running time after the vehicle is started, judging whether the running time after the vehicle is started reaches a first preset time, if so, controlling the fuel cell to start outputting power and controlling the output power of the fuel cell to gradually increase to the first preset power, and entering S3; otherwise, the fuel cell does not output power.
Optionally, when the driving time after the vehicle is started reaches a second predetermined time, the output power of the fuel cell is increased to a first predetermined power, wherein: the second predetermined length of time is greater than the first predetermined length of time. That is, the output power of the fuel cell is controlled to gradually increase from zero to the first predetermined power within a time window from the first predetermined time period to the second predetermined time period. Optionally, during the time window, the output power of the fuel cell is gradually increased to the first predetermined power according to a linear increasing rule.
And S3, acquiring the SOC value, the vehicle speed and the residual hydrogen amount of the battery, and switching the output power state of the fuel cell based on the acquired SOC value, the vehicle speed and the residual hydrogen amount of the battery.
Optionally, the output power state of the fuel cell includes the following five states:
in the first state, the fuel cell outputs a first preset power, and the first preset power is larger than zero and smaller than the rated maximum output power of the fuel cell;
state two, the fuel cell stops power output, that is: the output power of the fuel cell is zero.
And in the third state, the fuel cell outputs a second preset power, and the second preset power is larger than the first preset power and smaller than the rated maximum output power of the fuel cell.
And in the fourth state, the fuel cell outputs rated maximum output power.
And in the fifth state, the fuel cell outputs a third preset power, and the third preset power is larger than the second preset power and smaller than the rated maximum output power of the fuel cell.
The five states are switched as follows:
in state one, the fuel cell outputs a first predetermined power. Acquiring a battery SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired battery SOC value, vehicle speed and residual hydrogen amount as follows: when the SOC value of the battery is larger than the SOC value of the fifth battery or the residual hydrogen amount is equal to zero, switching to a state two; when the SOC value of the battery is greater than the SOC value of the third battery, the vehicle speed is greater than the first preset vehicle speed and less than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a third state; when the SOC value of the battery is smaller than the SOC value of the first battery and the residual hydrogen amount is larger than zero, switching to a state four; and when the SOC value of the battery is smaller than the SOC value of the second battery, the vehicle speed is greater than a first preset vehicle speed, and the residual hydrogen quantity is greater than zero, switching to a fifth state.
And in the second state, the fuel cell stops power output. Acquiring a battery SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired battery SOC value, vehicle speed and residual hydrogen amount as follows: entering a first state when the SOC value of the battery is smaller than the SOC value of the fourth battery, the vehicle speed is smaller than a first preset vehicle speed, and the residual hydrogen quantity is larger than zero; when the SOC value of the battery is smaller than the SOC value of the fourth battery, the vehicle speed is greater than the first preset vehicle speed and smaller than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a third state; and when the SOC value of the battery is smaller than the SOC value of the fourth battery, the vehicle speed is greater than a second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a state four.
And in the third state, the fuel cell outputs the second preset power. Acquiring a battery SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired battery SOC value, vehicle speed and residual hydrogen amount as follows: when the SOC value of the battery is larger than the first SOC value and smaller than the fourth SOC value, the vehicle speed is smaller than a first preset vehicle speed, and the residual hydrogen amount is larger than zero, switching to a first state; when the SOC value of the battery is larger than the SOC value of the fifth battery or the residual hydrogen amount is equal to zero, switching to a state two; when the SOC value of the battery is larger than the SOC value of the first battery and smaller than the SOC value of the fourth battery, the vehicle speed is larger than a second preset vehicle speed, and the residual hydrogen amount is larger than zero, switching to a state four; and when the SOC value of the battery is smaller than the second SOC value of the battery, the vehicle speed is greater than the first preset vehicle speed and smaller than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a fifth state.
And in the fourth state, the fuel cell outputs rated maximum output power. Acquiring a battery SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired battery SOC value, vehicle speed and residual hydrogen amount as follows: when the SOC value of the battery is larger than the first SOC value of the battery, the vehicle speed is smaller than a first preset vehicle speed, and the residual hydrogen quantity is larger than zero, switching to a first state; when the battery SOC value is larger than the first battery SOC value and smaller than the second battery SOC value, the vehicle speed is larger than the first preset vehicle speed and smaller than the second preset vehicle speed, and the residual hydrogen amount is larger than zero, switching to a fifth state; when the SOC value of the battery is greater than the SOC value of the third battery, the vehicle speed is greater than the first preset vehicle speed and less than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a third state; and when the SOC value of the battery is larger than the SOC value of the fifth battery or the residual hydrogen amount is equal to zero, switching to the state two.
And in the fifth state, the fuel cell outputs the third preset power. Acquiring a battery SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired battery SOC value, vehicle speed and residual hydrogen amount as follows: when the SOC value of the battery is larger than the first SOC value of the battery, the vehicle speed is smaller than a first preset vehicle speed, and the residual hydrogen quantity is larger than zero, switching to a first state; when the SOC value of the battery is greater than the SOC value of the third battery, the vehicle speed is greater than the first preset vehicle speed and less than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a third state; when the SOC value of the battery is smaller than the SOC value of the first battery or the vehicle speed is larger than a second preset vehicle speed and the residual hydrogen quantity is larger than zero, switching to a state four; when the remaining hydrogen amount is equal to zero, the state two is switched.
Wherein: the first battery SOC value is smaller than the second battery SOC value, the second battery SOC value is smaller than the third battery SOC value, the third battery SOC value is smaller than the fourth battery SOC value, and the fourth battery SOC value is smaller than the fifth battery SOC value.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention will be described with a more specific embodiment, in which:
the output power in each state is:
in the first state, the output power of the fuel cell is one third of the rated maximum output power, namely the first preset power is one third of the rated maximum output power;
in the second state, the output power of the fuel cell is zero;
in the third state, the output power of the fuel cell is one half of the rated maximum output power, namely the second preset power is one half of the rated maximum output power;
in the state IV, the output power of the fuel cell is the rated maximum output power;
in the fifth state, the power output by the fuel cell is two thirds of the rated maximum output power, that is, the third predetermined power is two thirds of the rated maximum output power.
The five predetermined values of the battery SOC value are respectively:
the first battery SOC value is 0.4, namely the residual capacity of the battery is 0.4 of the total capacity of the battery;
the second battery SOC value is 0.75, namely the residual capacity of the battery is 0.75 of the total capacity of the battery;
the third battery SOC value is 0.76, namely the residual capacity of the battery is 0.76 of the total capacity of the battery;
the fourth battery SOC value is 0.83, namely the residual capacity of the battery is 0.83 of the total capacity of the battery;
the fifth battery SOC value is 0.85, i.e., the remaining capacity of the battery is 0.85 of the total capacity of the battery.
The SOC value of the first battery is set to be 0.4, the electric quantity of the power battery is low, the output power of the fuel battery needs to be improved when the SOC value is lower than the SOC value, on one hand, power guarantee is provided for vehicle running, normal running of the vehicle is guaranteed, and on the other hand, timely charging of the battery is achieved to avoid serious feeding of the power battery.
The SOC value of the fifth battery is set to be 0.85, which represents that the electric quantity of the power battery is high, and the output power of the fuel battery is not needed when the SOC value of the fifth battery is higher than the SOC value of the fifth battery, so that the power battery is prevented from being overcharged.
The difference between the second battery SOC value and the third battery SOC value is only 0.01, and the difference between the fourth battery SOC value and the fifth battery SOC value is only 0.02, which is a power hysteresis setting, so that the fuel battery can stably run as much as possible in order to avoid frequent switching of the fuel battery power.
The two predetermined values for vehicle speed are: the first predetermined vehicle speed is 5km/h and the second predetermined vehicle speed is 55 km/h.
Wherein:
5km/h represents a low value of the vehicle speed below which the power required by the vehicle is considered to be low, and the fuel cell can be controlled to output the low power.
55km/h represents a higher value of the vehicle running speed, above which the fuel cell can be controlled to output a higher power, considering that the power required by the vehicle is higher.
Two predetermined values of the travel time period after the vehicle is started are: the first predetermined period of time is 8s and the second predetermined period of time is 16 seconds.
The embodiment comprises the following steps:
s1, judging whether the vehicle is started or not, and if so, entering S2; otherwise, the fuel cell does not output power.
S2, obtaining the running time after the vehicle is started, judging whether the running time after the vehicle is started reaches 8S, if so, controlling the fuel cell to start outputting power and controlling the output power of the fuel cell to be gradually increased according to a linear increasing rule, increasing the output power to one third of the rated maximum output power when the running time after the vehicle is started reaches 16S, and then entering S3; otherwise, the fuel cell does not output power.
And S3, acquiring the SOC value, the vehicle speed and the residual hydrogen amount of the battery, and switching the output power state of the fuel cell based on the acquired SOC value, the vehicle speed and the residual hydrogen amount of the battery.
State one, the fuel cell is held at one third of the rated maximum output power. Acquiring a battery SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired battery SOC value, vehicle speed and residual hydrogen amount as follows: when the SOC value of the battery is larger than 0.85 or the residual hydrogen amount is zero, switching to a state two; when the SOC value of the battery is more than 0.76, the vehicle speed is more than 5km/h and less than 55km/h, and the residual hydrogen amount is more than zero, switching to a state III; when the SOC value of the battery is less than 0.4 and the residual hydrogen amount is more than zero, switching to a state four; and when the SOC value of the battery is less than 0.75, the vehicle speed is more than 5km/h and the residual hydrogen amount is more than zero, switching to a fifth state.
And in the second state, the fuel cell stops power output. Acquiring a battery SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired battery SOC value, vehicle speed and residual hydrogen amount as follows: when the SOC value of the battery is less than 0.83, the vehicle speed is less than 5km/h and the residual hydrogen amount is more than zero, switching to a state I; when the SOC value of the battery is less than 0.83, the vehicle speed is more than 5km/h and less than 55km/h, and the residual hydrogen amount is more than zero, switching to a state III; and when the SOC value of the battery is less than 0.83, the vehicle speed is greater than 55km/h and the residual hydrogen amount is greater than zero, switching to the state four.
And in the third state, the fuel cell outputs one half of the rated maximum output power. Acquiring a battery SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired battery SOC value, vehicle speed and residual hydrogen amount as follows: when the SOC value of the battery is more than 0.4 and less than 0.83, the vehicle speed is less than 5km/h and the residual hydrogen amount is more than zero, switching to a state I; when the SOC value of the battery is larger than 0.85 or the residual hydrogen amount is equal to zero, switching to a state two; when the SOC value of the battery is more than 0.4 and less than 0.83, the vehicle speed is more than 55km/h and the residual hydrogen amount is more than zero, switching to a state four; and when the SOC value of the battery is less than 0.75, the vehicle speed is more than 5km/h and less than 55km/h, and the residual hydrogen amount is more than zero, switching to a state five.
And in the fourth state, the fuel cell outputs rated maximum output power. Acquiring a battery SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired battery SOC value, vehicle speed and residual hydrogen amount as follows: when the SOC value of the battery is more than 0.4, the vehicle speed is less than 5km/h and the residual hydrogen amount is more than zero, switching to a state I; when the SOC value of the battery is more than 0.4 and less than 0.75, the vehicle speed is more than 5km/h and less than 55km/h, and the residual hydrogen amount is more than zero, switching to a fifth state; when the SOC value of the battery is more than 0.76, the vehicle speed is more than 5km/h and less than 55km/h, and the residual hydrogen amount is more than zero, switching to a state III; and when the SOC value of the battery is larger than 0.85 or the residual hydrogen quantity is equal to zero, switching to the state two.
And in the fifth state, the fuel cell outputs the third preset power. Acquiring a battery SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired battery SOC value, vehicle speed and residual hydrogen amount as follows: when the SOC value of the battery is more than 0.4, the vehicle speed is less than 5km/h and the residual hydrogen amount is more than zero, switching to a state I; when the SOC value of the battery is more than 0.76, the vehicle speed is more than 5km/h and less than 55km/h, and the residual hydrogen amount is more than zero, switching to a state III; when the SOC value of the battery is less than 0.4 or the vehicle speed is more than 55km/h and the residual hydrogen amount is more than zero, switching to a state four; when the remaining hydrogen amount is equal to zero, the state two is switched.
The present invention is not intended to be limited to the particular embodiments shown, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A fuel cell power distribution control method characterized by comprising:
step one, judging whether the vehicle is started, if so, entering a step two; otherwise, the fuel cell does not output power;
step two, acquiring the running time after the vehicle is started, judging whether the running time after the vehicle is started reaches a first preset time, if so, controlling the fuel cell to start outputting power and controlling the output power of the fuel cell to gradually increase to the first preset power, and entering step three; otherwise, the fuel cell does not output power;
step three, switching the output power state of the fuel cell based on the SOC value of the battery, the vehicle speed and the residual hydrogen amount;
the output power state of the fuel cell and the switching process between the output power states are as follows:
the first state is that the fuel cell outputs at a first preset power, the SOC value, the vehicle speed and the residual hydrogen amount of the battery are obtained, and the output state of the fuel cell is switched according to the obtained SOC value, the vehicle speed and the residual hydrogen amount as follows: when the SOC value of the battery is larger than the SOC value of the fifth battery or the residual hydrogen amount is equal to zero, switching to a state two; when the SOC value of the battery is greater than the SOC value of the third battery, the vehicle speed is greater than the first preset vehicle speed and less than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a third state; when the SOC value of the battery is smaller than the SOC value of the first battery and the residual hydrogen amount is larger than zero, switching to a state four; when the SOC value of the battery is smaller than the SOC value of the second battery, the vehicle speed is greater than a first preset vehicle speed, and the residual hydrogen quantity is greater than zero, switching to a fifth state;
and secondly, stopping power output of the fuel cell, acquiring a cell SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired cell SOC value, the vehicle speed and the residual hydrogen amount as follows: entering a first state when the SOC value of the battery is smaller than the SOC value of the fourth battery, the vehicle speed is smaller than a first preset vehicle speed, and the residual hydrogen quantity is larger than zero; when the SOC value of the battery is smaller than the SOC value of the fourth battery, the vehicle speed is greater than the first preset vehicle speed and smaller than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a third state; when the SOC value of the battery is smaller than the SOC value of the fourth battery, the vehicle speed is larger than a second preset vehicle speed, and the residual hydrogen quantity is larger than zero, switching to a state four;
and thirdly, outputting the fuel cell at a second preset power, acquiring the SOC value, the vehicle speed and the residual hydrogen amount of the fuel cell, and switching the output state of the fuel cell based on the acquired SOC value, the vehicle speed and the residual hydrogen amount as follows: when the SOC value of the battery is larger than the first SOC value and smaller than the fourth SOC value, the vehicle speed is smaller than a first preset vehicle speed, and the residual hydrogen amount is larger than zero, switching to a first state; when the SOC value of the battery is larger than the SOC value of the fifth battery or the residual hydrogen amount is equal to zero, switching to a state two; when the SOC value of the battery is larger than the SOC value of the first battery and smaller than the SOC value of the fourth battery, the vehicle speed is larger than a second preset vehicle speed, and the residual hydrogen amount is larger than zero, switching to a state four; when the SOC value of the battery is smaller than the second SOC value of the battery, the vehicle speed is greater than the first preset vehicle speed and smaller than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a fifth state;
and fourthly, outputting the fuel cell at rated maximum output power, acquiring a cell SOC value, a vehicle speed and a residual hydrogen amount, and switching the output state of the fuel cell based on the acquired cell SOC value, the vehicle speed and the residual hydrogen amount as follows: when the SOC value of the battery is larger than the first SOC value of the battery, the vehicle speed is smaller than a first preset vehicle speed, and the residual hydrogen quantity is larger than zero, switching to a first state; when the battery SOC value is larger than the first battery SOC value and smaller than the second battery SOC value, the vehicle speed is larger than the first preset vehicle speed and smaller than the second preset vehicle speed, and the residual hydrogen amount is larger than zero, switching to a fifth state; when the SOC value of the battery is greater than the SOC value of the third battery, the vehicle speed is greater than the first preset vehicle speed and less than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a third state; when the SOC value of the battery is larger than the SOC value of the fifth battery or the residual hydrogen amount is equal to zero, switching to a state two;
and outputting the fuel cell at a third preset power, acquiring the SOC value, the vehicle speed and the residual hydrogen quantity of the fuel cell, and switching the output state of the fuel cell based on the acquired SOC value, the vehicle speed and the residual hydrogen quantity as follows: when the SOC value of the battery is larger than the first SOC value of the battery, the vehicle speed is smaller than a first preset vehicle speed, and the residual hydrogen quantity is larger than zero, switching to a first state; when the SOC value of the battery is greater than the SOC value of the third battery, the vehicle speed is greater than the first preset vehicle speed and less than the second preset vehicle speed, and the residual hydrogen amount is greater than zero, switching to a third state; when the SOC value of the battery is smaller than the SOC value of the first battery or the vehicle speed is larger than a second preset vehicle speed and the residual hydrogen quantity is larger than zero, switching to a state four; when the residual hydrogen amount is equal to zero, switching to a state two;
wherein:
the first predetermined power is less than the second predetermined power, the second predetermined power is less than the third predetermined power, and the third predetermined power is less than the rated maximum output power of the fuel cell;
the first battery SOC value is smaller than the second battery SOC value, the second battery SOC value is smaller than the third battery SOC value, the third battery SOC value is smaller than the fourth battery SOC value, and the fourth battery SOC value is smaller than the fifth battery SOC value.
2. The fuel cell power distribution control method according to claim 1, wherein the output power of the fuel cell is raised to the first predetermined power when a running period after the start of the vehicle reaches a second predetermined period, wherein: the second predetermined length of time is greater than the first predetermined length of time.
3. The fuel cell power distribution control method according to claim 1, wherein the output power of the fuel cell is gradually increased to the first predetermined power according to a linear increase law.
4. The fuel cell power distribution control method according to claim 1, wherein the first predetermined power is one-third of a rated maximum output power of the fuel cell, the second predetermined power is one-half of the rated maximum output power of the fuel cell, and the third predetermined power is two-thirds of the rated maximum output power of the fuel cell.
5. The fuel cell power distribution control method according to claim 1, wherein the first cell SOC value is 0.4, the second cell SOC value is 0.75, the third cell SOC value is 0.76, the fourth cell SOC value is 0.83, and the fifth cell SOC value is 0.85.
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