CN113071377A - Power supply power distribution method based on running state of hybrid electric vehicle - Google Patents
Power supply power distribution method based on running state of hybrid electric vehicle Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000446 fuel Substances 0.000 claims abstract description 119
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 103
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 103
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 98
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 98
- 239000001257 hydrogen Substances 0.000 claims abstract description 98
- 230000001133 acceleration Effects 0.000 claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/40—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for controlling a combination of batteries and fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention provides a power distribution method of a power supply based on the running state of a hybrid electric vehicle, which divides the running state of the hybrid electric vehicle into 5 working conditions of starting acceleration, accelerating, running, decelerating and braking, and the power supply mode comprises 3 working conditions of lithium battery power supply, hydrogen fuel battery system and lithium battery hybrid power supply. The method comprises the following steps: according to the running state of the hybrid electric vehicle and the required power of the whole vehicle, which are acquired in real time, a power supply mode switching strategy is adopted to determine a power supply mode of a power supply, and a power distribution strategy is adopted to determine the real-time output power value output by a hydrogen fuel cell system and a lithium battery, so that the output power of the hydrogen fuel cell system and the lithium battery is controlled, the required power of the whole vehicle is met, and the energy distribution of the hydrogen fuel cell system and the lithium battery is realized. The invention integrates the power supply mode switching strategy and the power distribution strategy, can be applied to power supply power distribution of a hybrid electric vehicle, and improves the power performance of the whole vehicle.
Description
Technical Field
The invention belongs to the technical field of hybrid electric vehicles, and particularly relates to a power distribution method of a power supply based on the running state of a hybrid electric vehicle.
Background
Fuel cell vehicles have also been rapidly developed in recent years as important components of new energy vehicles. However, the output characteristics of the fuel cell system at the present stage are soft, and the operating state of the hybrid vehicle is affected by the life problem of the core component stack of the battery system. How to make the hybrid power source (fuel cell system and lithium battery) work stably, reliably and efficiently is one of the key technologies of the hybrid electric vehicle. Therefore, the research on the power distribution method of the power supply is of great significance to the hybrid electric vehicle. The power performance of the hybrid electric vehicle is urgently needed to be solved, the cycle life of the lithium battery is prolonged, the power performance, the real-time performance and the reliability of the hybrid electric vehicle are improved, meanwhile, the cost of the whole vehicle is reduced, and the economical efficiency is improved. However, the existing patents (such as "201911355976. X") do not consider the running state of the hybrid electric vehicle in real time, and influence the real-time performance, so that the loss of the power supply power is caused to a certain extent.
In view of the above, a power distribution method for a power source based on an operating state of a hybrid vehicle is proposed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the power distribution method of the power supply based on the running state of the hybrid electric vehicle is invented, the problems that the power performance of the hybrid electric vehicle cannot meet the system requirement and the cycle life of a lithium battery is short are solved, the power performance, the real-time performance and the reliability of the hybrid electric vehicle are improved, the cost of the whole vehicle is reduced, and the economy is improved.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a power distribution method of a power supply based on the running state of a hybrid electric vehicle is characterized in that the running state of the hybrid electric vehicle is divided into 5 working conditions which are respectively starting acceleration, accelerating, running, decelerating and braking, and the power supply mode comprises lithium battery power supply, hydrogen fuel battery system and lithium battery hybrid power supply.
The power distribution method of the power supply comprises the following steps:
the method comprises the following steps: acquiring the running state of the hybrid electric vehicle, the required power of the whole vehicle and the SOC of the lithium battery in real time;
step two: determining a power supply mode by adopting a power mode switching strategy according to the running state of the hybrid electric vehicle and the required power of the whole vehicle;
step three: determining real-time output power values output by a hydrogen fuel cell system and a lithium battery by adopting a power distribution strategy according to a power supply mode of a power supply;
step four: controlling the output power of the hydrogen fuel cell system and the lithium battery according to the real-time output power value so as to meet the power demand of the whole vehicle;
and repeating the first step to the fourth step to realize the energy distribution of the hydrogen fuel cell system and the lithium battery.
Further, the power mode switching policy is:
(1) when the running state of the hybrid electric vehicle is a starting acceleration state, the power supply mode supplies power to the lithium battery;
(2) when the running state of the hybrid electric vehicle is the speed increasing state and the running state, the power supply mode is determined by any one of the following conditions:
when the required power of the whole vehicle is smaller than the rated power of the hydrogen fuel cell system, the power supply mode supplies power to the hydrogen fuel cell system;
when the required power of the whole vehicle is greater than or equal to the rated power of the hydrogen fuel cell system and the SOC of the lithium battery is less than a first threshold value, the power supply mode supplies power to the hydrogen fuel cell system;
when the required power of the whole vehicle is greater than or equal to the rated power of the hydrogen fuel cell system and the SOC of the lithium battery is greater than or equal to a first threshold value, the power supply mode is a hybrid power supply mode of the hydrogen fuel cell system and the lithium battery;
(3) when the running state of the hybrid electric vehicle is a deceleration state, the power supply mode supplies power to the hydrogen fuel cell system;
(4) when the hybrid electric vehicle is in a braking state, the power supply mode supplies power to the hydrogen fuel cell system.
Further, the power allocation policy is:
(1) when the power supply mode is a lithium battery power supply mode, the output power of the lithium battery is the sum of the required power of the whole vehicle and the power required by the starting of the hydrogen fuel cell system, and the hydrogen fuel cell system of the whole vehicle is controlled;
(2) when the power supply mode supplies power to the hydrogen fuel cell system, if the required power of the whole vehicle is smaller than the rated power of the hydrogen fuel cell system, the output power of the hydrogen fuel cell system is the required power of the whole vehicle, and the output power of the lithium battery is 0; if the required power of the whole vehicle is more than or equal to the rated power of the hydrogen fuel cell system, the output power of the hydrogen fuel cell system is the rated power of the hydrogen fuel cell system, and the output power of the lithium battery is 0; when the SOC of the lithium battery is smaller than a second threshold value and the required power of the whole vehicle is smaller than the rated power of the hydrogen fuel cell system, the hydrogen fuel cell system charges the lithium battery, wherein the second threshold value is larger than the first threshold value;
(3) when the power supply mode is the hybrid power supply of the hydrogen fuel cell system and the lithium battery, the output power of the hydrogen fuel cell system is the rated output power of the hydrogen fuel cell system, and the output power of the lithium battery is the difference between the required power of the whole vehicle and the rated power of the hydrogen fuel cell system.
Further, the first threshold is larger than the minimum value of the required SOC of the lithium battery in normal work, the difference value between the first threshold and the minimum value of the required SOC of the lithium battery in normal work is smaller than a first error threshold, the second threshold is smaller than the maximum value of the SOC of the lithium battery in normal work, and the difference value between the maximum value of the SOC of the lithium battery in normal work and the second threshold is smaller than a second error threshold.
The invention aims at the problems of poor real-time performance of power distribution, incapability of meeting the system requirement of power performance and short cycle life of a lithium battery of the traditional hybrid electric vehicle, and provides a power distribution method of a power supply based on the running state of the hybrid electric vehicle, which integrates a power mode switching strategy and a power distribution strategy and mainly has the following advantages:
(1) the running state of the hybrid electric vehicle is divided into 5 working conditions of starting acceleration, speed increase, running, speed reduction and braking, the power supply mode comprises 3 working conditions of lithium battery power supply, hydrogen fuel battery system and lithium battery hybrid power supply, the vehicle control unit collects displacement information of an accelerator pedal and a brake pedal in real time, the running state and the required power of the hybrid electric vehicle are determined according to the displacement information, and meanwhile, the state of a lithium battery is collected in real time to determine the SOC of the lithium battery, so that the real-time performance of the vehicle is guaranteed.
(2) The power supply mode switching strategy is provided to determine the power supply mode of the power supply, the power distribution strategy is provided to determine the real-time output power value output by the hydrogen fuel cell system and the lithium battery, the required power is reasonably distributed between the two power sources, the power performance of the whole vehicle is improved, the lithium battery is ensured to continuously work in the best service life area, the hydrogen consumption is reduced, the cost is reduced, and the reliability is improved.
(3) The kinetic energy recovery of the hybrid electric vehicle is realized, when the hybrid electric vehicle is powered by the hydrogen fuel cell system, the lithium battery determines whether to enter a charging state according to the SOC value, and when the lithium battery enters a charging mode, the kinetic energy recovery of the running working condition can be realized, and the energy is saved.
Drawings
Fig. 1 is a structural schematic diagram corresponding to a power distribution method of a power supply based on a hybrid electric vehicle running state according to an embodiment of the present invention;
fig. 2 is a flowchart of a power distribution method of a power supply based on an operation state of a hybrid electric vehicle according to an embodiment of the present invention.
Description of reference numerals: 1. a vehicle control unit; 2. a power distribution system; 3. a power distribution system; 4. a fuel cell control unit; 5. a battery management system; 6. a power supply system; 7. a load; 6-1. a hydrogen fuel cell system; 6-2. lithium battery.
Detailed Description
The present invention will be further described with reference to the following examples and drawings, but the present invention is not limited thereto.
The invention integrates the power supply mode switching strategy and the power distribution strategy, determines the power supply mode and the real-time output power of the hydrogen fuel cell system and the lithium battery, improves the power performance of the whole vehicle and reduces the cost; meanwhile, kinetic energy recovery under the operating condition is realized, and energy is saved.
The invention provides a power supply power distribution method based on the running state of a hybrid electric vehicle, which divides the running state of the hybrid electric vehicle into 5 working conditions of starting acceleration, accelerating, running, decelerating and braking, wherein the power supply mode comprises 3 working conditions of lithium battery power supply, hydrogen fuel battery system and lithium battery hybrid power supply, and a power supply mode switching strategy and a power distribution strategy are adopted under different working conditions to improve the overall performance of the hybrid electric vehicle.
The power distribution method of the power supply based on the running state of the hybrid electric vehicle is shown in a schematic diagram of fig. 1, and the power is reasonably distributed by a vehicle control unit 1, a power distribution system 2, a power distribution system 3, a fuel cell control unit 4, a battery management system 5, a power supply system 6 and CAN buses among the power control units. The power supply system 6 comprises a hydrogen fuel cell system 6-1 and a lithium battery 6-2, the vehicle control unit 1 is respectively connected with the power distribution system 2, the power distribution system 3, the hydrogen fuel cell system 6-1 and the lithium battery 6-2 through CAN buses, the power distribution system 2 is respectively connected with the power distribution system 3, the fuel cell control unit 4 and the battery management system 5 through CAN buses, the fuel cell control unit 4 is connected with the power supply system 6-1 through CAN buses, the power distribution system 3 is respectively connected with the battery management system 5 and the fuel cell control unit 4 through CAN buses, the battery management system 5 is connected with the lithium battery 6-2 through CAN buses, the hydrogen fuel cell system 6-1 comprises a hydrogen fuel cell stack and a DC/DC converter which are mutually connected, the DC/DC converter is connected with a load 7 through a switch K1, the lithium battery 6-2 is connected with the load 7 through a switch K2, and the power distribution system 2 controls the switch K1 and the switch K2 to be closed and opened respectively.
The power distribution method of the power supply based on the running state of the hybrid electric vehicle is shown in figure 2 and comprises the following steps:
s101: acquiring the running state of the hybrid electric vehicle, the required power of the whole vehicle and the SOC of the lithium battery in real time;
s102: determining a power supply mode by adopting a power mode switching strategy according to the running state of the hybrid electric vehicle and the required power of the whole vehicle;
s103: determining real-time output power values output by a hydrogen fuel cell system and a lithium battery by adopting a power distribution strategy according to a power supply mode of a power supply;
s104: controlling the output power of the hydrogen fuel cell system and the lithium battery according to the real-time output power value so as to meet the power demand of the whole vehicle;
and repeating the steps S101 to S104 to realize the energy distribution of the hydrogen fuel cell system and the lithium battery.
The power distribution method of the power supply based on the running state of the hybrid electric vehicle comprises the following specific steps:
vehicle starting power-on control: when the key is turned to the ON gear, the vehicle control unit 1 is awakened and carries out self-checking, then the battery management system 1 and the fuel cell control unit 4 carry out self-checking, and after no fault exists, the vehicle control unit sends a power-ON instruction and controls to complete power-ON. The vehicle control unit acquires displacement information of an accelerator pedal and a brake pedal in real time through a CAN bus, determines the running state and the required power of the hybrid electric vehicle according to the displacement information, and acquires the state of the lithium battery 6-2 in real time to determine the SOC of the lithium battery. SOC (state of charge), which is a state of charge, is used to reflect the remaining capacity of the lithium battery, and is defined numerically as a ratio of the remaining capacity to the battery capacity, and is represented by a common percentage, where the value ranges from 0% to 100%, when SOC is 0, the lithium battery is completely discharged, and when SOC is 100%, the battery is completely charged.
Further, the power distribution system 2 determines a power supply mode by adopting a power mode switching strategy according to the running state of the hybrid electric vehicle and the required power of the whole vehicle, wherein the power mode switching strategy is;
(1) when the running state of the hybrid electric vehicle is the starting acceleration state, the power distribution system 2 determines that the power supply mode supplies power to the lithium battery, sends a control signal to the battery management system 5 and the fuel cell control unit 4 through the CAN bus, closes the switch K2 (i.e., the second switch), simultaneously starts the hydrogen fuel cell system 6-1, and closes the switch K1 (i.e., the first switch) after the hydrogen fuel cell system 6-1 is started.
(2) When the running state of the hybrid electric vehicle is the speed increasing state and the running state, the power supply mode is determined by any one of the following conditions:
when the required power of the whole vehicle is smaller than the rated power of the hydrogen fuel cell system, the power distribution system 2 determines that the power supply mode supplies power for the hydrogen fuel cell system 6-1, sends control signals to the battery management system 5 and the fuel cell control unit 4 through the CAN bus, opens the switch K2 and closes the switch K1;
when the required power of the whole vehicle is greater than or equal to the rated power of the hydrogen fuel cell system and the SOC of the lithium battery is less than a first threshold value, the power distribution system 2 determines a power supply mode to supply power for the hydrogen fuel cell system, sends control signals to the battery management system 5 and the fuel cell control unit 4 through the CAN bus, opens the switch K2 and closes the switch K1;
when the required power of the whole vehicle is greater than or equal to the rated power of the hydrogen fuel cell system and the SOC of the lithium battery is greater than or equal to a first threshold value, the power distribution system 2 determines that the power supply mode is hybrid power supply of the hydrogen fuel cell system and the lithium battery, sends control signals to the battery management system 5 and the fuel cell control unit 4 through the CAN bus, and closes a switch K1 and a switch K2;
(3) when the running state of the hybrid electric vehicle is a deceleration state, the power distribution system 2 determines that the power supply mode is the power supply mode for supplying power to the hydrogen fuel cell system 6-1, sends control signals to the battery management system 5 and the fuel cell control unit 4 through the CAN bus, opens the switch K2 and closes the switch K1;
(4) when the hybrid electric vehicle is in a braking state, the power distribution system 2 determines that a power supply mode supplies power for the hydrogen fuel cell system, sends control signals to the battery management system 5 and the fuel cell control unit 4 through the CAN bus, opens the switch K2 and closes the switch K1; when the SOC of the lithium battery is smaller than a second threshold value and the power required by the whole vehicle is smaller than the rated power of the hydrogen fuel battery system, the power distribution system 2 determines that the hydrogen fuel battery system charges the lithium battery, sends control signals to the battery management system 5 and the fuel battery control unit 4 through the CAN bus, and closes the switch K1 and the switch K2, wherein the second threshold value is larger than the first threshold value.
The first threshold value is larger than the minimum value of the required SOC of the lithium battery in normal work, the difference value between the first threshold value and the minimum value of the required SOC of the lithium battery in normal work is smaller than a first error threshold value, the second threshold value is smaller than the maximum value of the SOC of the lithium battery in normal work, and the difference value between the maximum value of the SOC of the lithium battery in normal work and the second threshold value is smaller than a second error threshold value.
In an embodiment, the first threshold is a value within an optimal selection range of the SOC of the lithium battery system, which is slightly larger than a lower limit (a minimum value of the SOC required for normal operation of the lithium battery), and is generally 35%, and the second threshold is a value within the optimal selection range of the SOC of the lithium battery system, which is slightly smaller than an upper limit (a maximum value of the SOC of the lithium battery during normal operation), which is generally 80%, and is larger than the first threshold.
Further, the power distribution system 3 determines the real-time output power values output by the hydrogen fuel cell system 6-1 and the lithium battery 6-2 by adopting a power distribution strategy according to a power supply mode, and sends target output power signals of the lithium battery and the fuel cell to the battery management system 5 and the fuel cell control unit 4 through the CAN bus. The power allocation strategy is as follows:
(1) when the power supply mode is that the lithium battery supplies power, the output power of the lithium battery 6-2 is the sum of the required power of the whole vehicle and the power required by the starting of the hydrogen fuel cell system 6-1, and the whole vehicle controller starts the hydrogen fuel cell system;
(2) when the power supply mode is to supply power to the hydrogen fuel cell system, if the required power of the whole vehicle is smaller than the rated power of the hydrogen fuel cell system, the output power of the hydrogen fuel cell system 6-1 is the required power of the whole vehicle, and the output power of the lithium battery is 0; if the required power of the whole vehicle is more than or equal to the rated power of the hydrogen fuel cell system, the output power of the hydrogen fuel cell system 6-1 is the rated power of the hydrogen fuel cell system, and the output power of the lithium battery is 0; when the SOC of the lithium battery is less than or equal to a second threshold value and the required power of the whole vehicle is less than the rated power of the hydrogen fuel cell system, the hydrogen fuel cell system charges the lithium battery;
(3) when the power supply mode is the mixed power supply of the hydrogen fuel cell system and the lithium battery, the output power of the hydrogen fuel cell system 6-1 is the rated output power of the hydrogen fuel cell system, and the output power of the lithium battery 6-2 is the difference between the required power of the whole vehicle and the rated power of the hydrogen fuel cell system 6-1.
And further, controlling the output power of the hydrogen fuel cell system 6-1 and the lithium battery 6-2 according to the real-time output power value so as to meet the power demand of the whole vehicle and ensure that the hybrid electric vehicle runs according to the demand of a driver. On the premise of meeting the indexes of the whole vehicle, the power consumption of the lithium battery can be reduced, and the driving range of the whole vehicle is increased.
Further, the vehicle is turned off and the power is controlled: when the key is turned to the OFF gear from the ON gear, the whole vehicle enters a lower current range, the power distribution system 3 sends target output power signals of a lithium battery and a fuel battery to the battery management system 5 and the fuel battery control unit 4 through the CAN bus, the power distribution system 2 sends a power-OFF command to the battery management system 5 and the fuel battery control unit 4 through the CAN bus, the switch K1 and the switch K2 are disconnected, and the whole vehicle controller 1 is powered OFF after the power-OFF of the battery management system 5 and the fuel battery control unit 4 is completed.
The power distribution method of the power supply based on the running state of the hybrid electric vehicle is described in detail, and the implementation description is only used for helping to understand the method and the core idea of the power distribution method; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (4)
1. A power distribution method of a power supply based on the running state of a hybrid electric vehicle is characterized in that the running state of the hybrid electric vehicle is divided into 5 working conditions which are respectively starting acceleration, accelerating, running, decelerating and braking, and the power supply mode comprises lithium battery power supply, hydrogen fuel battery system and lithium battery hybrid power supply;
the power distribution method of the power supply comprises the following steps:
the method comprises the following steps: acquiring the running state of the hybrid electric vehicle, the required power of the whole vehicle and the SOC of the lithium battery in real time;
step two: determining a power supply mode by adopting a power mode switching strategy according to the running state of the hybrid electric vehicle and the required power of the whole vehicle;
step three: determining real-time output power values output by a hydrogen fuel cell system and a lithium battery by adopting a power distribution strategy according to a power supply mode of a power supply;
step four: controlling the output power of the hydrogen fuel cell system and the lithium battery according to the real-time output power value so as to meet the power demand of the whole vehicle;
and repeating the first step to the fourth step to realize the energy distribution of the hydrogen fuel cell system and the lithium battery.
2. A power distribution method for a power source based on the running state of a hybrid electric vehicle according to claim 1, characterized in that the power mode switching strategy is:
(1) when the running state of the hybrid electric vehicle is a starting acceleration state, the power supply mode supplies power to the lithium battery;
(2) when the running state of the hybrid electric vehicle is the speed increasing state and the running state, the power supply mode is determined by any one of the following conditions:
when the required power of the whole vehicle is smaller than the rated power of the hydrogen fuel cell system, the power supply mode supplies power to the hydrogen fuel cell system;
when the required power of the whole vehicle is greater than or equal to the rated power of the hydrogen fuel cell system and the SOC of the lithium battery is less than a first threshold value, the power supply mode supplies power to the hydrogen fuel cell system;
when the required power of the whole vehicle is greater than or equal to the rated power of the hydrogen fuel cell system and the SOC of the lithium battery is greater than or equal to a first threshold value, the power supply mode is a hybrid power supply mode of the hydrogen fuel cell system and the lithium battery;
(3) when the running state of the hybrid electric vehicle is a deceleration state, the power supply mode supplies power to the hydrogen fuel cell system;
(4) when the hybrid electric vehicle is in a braking state, the power supply mode supplies power to the hydrogen fuel cell system.
3. A power distribution method for a power source of a hybrid electric vehicle based on an operation state of the hybrid electric vehicle according to claim 1, wherein the power distribution strategy is:
(1) when the power supply mode is to supply power to the lithium battery, the output power of the lithium battery is the sum of the required power of the whole vehicle and the power required by the starting of the hydrogen fuel cell system, and the whole vehicle controller starts the hydrogen fuel cell system;
(2) when the power supply mode supplies power to the hydrogen fuel cell system, if the required power of the whole vehicle is smaller than the rated power of the hydrogen fuel cell system, the output power of the hydrogen fuel cell system is the required power of the whole vehicle, and the output power of the lithium battery is 0; if the required power of the whole vehicle is more than or equal to the rated power of the hydrogen fuel cell system, the output power of the hydrogen fuel cell system is the rated power of the hydrogen fuel cell system, and the output power of the lithium battery is 0; when the SOC of the lithium battery is smaller than a second threshold value and the required power of the whole vehicle is smaller than the rated power of the hydrogen fuel cell system, the hydrogen fuel cell system charges the lithium battery, wherein the second threshold value is larger than the first threshold value;
(3) when the power supply mode is the hybrid power supply of the hydrogen fuel cell system and the lithium battery, the output power of the hydrogen fuel cell system is the rated output power of the hydrogen fuel cell system, and the output power of the lithium battery is the difference between the required power of the whole vehicle and the rated power of the hydrogen fuel cell system.
4. The power distribution method for the power supply of the hybrid electric vehicle based on the running state of the hybrid electric vehicle as claimed in claim 2 or 3, wherein the first threshold is greater than the minimum value of the SOC required when the lithium battery normally works, the difference between the first threshold and the minimum value of the SOC required when the lithium battery normally works is smaller than a first error threshold, the second threshold is smaller than the maximum value of the SOC when the lithium battery normally works, and the difference between the maximum value of the SOC and the second threshold is smaller than a second error threshold.
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| CN114290916A (en) * | 2022-01-05 | 2022-04-08 | 大运汽车股份有限公司 | Energy management method and system for hydrogen fuel hybrid power heavy truck |
| CN114290916B (en) * | 2022-01-05 | 2023-11-03 | 大运汽车股份有限公司 | Energy management method and system for hydrogen fuel hybrid power heavy truck |
| CN114394035A (en) * | 2022-01-22 | 2022-04-26 | 重庆长安新能源汽车科技有限公司 | Control method and control system for power generation of hydrogen fuel cell |
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| CN114824370A (en) * | 2022-04-08 | 2022-07-29 | 金龙联合汽车工业（苏州）有限公司 | Whole vehicle energy control method of double-pile fuel cell system |
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Application publication date: 20210706 |