WO2020135722A1 - Power system control method of fuel cell vehicle, computer device, and storage medium - Google Patents

Abstract

A power system (10) control method (20) of a fuel cell (120) vehicle, a computer device, and a storage medium. If a charge state of a power battery (110) is in a preset interval, a contactor (140) is closed, and a fuel cell (120) supplies power to a load (150). If the charge state is not in the preset interval, when the charge state is greater than an upper limit value of the preset interval, the contactor (140) is disconnected. When the charge state of the power battery (110) is in the preset interval, a fuel cell (120) works at a rated power thereof; a rated output voltage of the fuel cell (120) satisfies the voltage of a bus (160), and thus the contactor (140) can be closed to cause a short circuit in a transformer (130). The fuel cell (120) directly supplies power to the load (150) by means of the bus (160), the loss caused by the fact that the transformer (130) is always connected to a circuit can be effectively reduced, the power generation efficiency of the fuel cell (120) is improved, and the electric energy is saved.

Description

Fuel cell vehicle power system control method, computer equipment and storage medium

Related application

This disclosure requires the priority of the Chinese patent application filed on December 29, 2018, with the application number 201811646735.6 and titled "Fuel Cell Vehicle Power System Control Methods, Computer Equipment, and Storage Media," and the full text of which is hereby incorporated as reference.

Technical field

The present disclosure relates to the technical field of fuel cell hybrid power, in particular to a fuel cell vehicle power system control method, computer equipment, and storage medium.

Background technique

Hydrogen fuel cell is a power generation device that directly converts the chemical energy generated by the reaction of hydrogen and oxygen in the air into direct current electrical energy in the form of an electrochemical reaction without combustion. The reaction product is only heat and water, and it does not release pollutants. . Hydrogen fuel cells can generate electricity continuously by supplying only hydrogen and air. They have the advantages of high efficiency, no noise, and no pollution. Therefore, they have huge application potential in the field of transportation.

Existing fuel cell vehicles usually use a combination of hydrogen fuel cells and power batteries. Since fuel cells can only generate electrical energy and cannot store electrical energy, power batteries can be used to store electrical energy for subsequent use. The fuel cell can also generate electricity to power the electric drive system and automobile assembly via the bus. However, in the related art, the fuel cell voltage is lower than the bus voltage. Therefore, a transformer is required to increase the output voltage of the fuel cell, and then power the electric drive system and the automobile assembly through the bus. Transformer is a device that uses the principle of electromagnetic induction to change the voltage. The main components are the primary coil, secondary coil and iron core. The loss caused by the transformer during operation mainly comes from iron loss and copper loss. The iron loss is caused by the magnetic flux flowing in the iron core after the primary coil is energized. Because the iron core itself is also a conductor, a potential is induced on the plane perpendicular to the magnetic field lines, forming a closed loop on the cross section of the iron core and generating eddy currents. Cause losses. Copper loss is caused by the heat generated by the resistance of the copper wires that make up the primary and secondary coils, causing losses. Due to the existence of transformer iron loss and copper loss, after the transformer is connected, the power generated by the fuel cell will be greatly lost, resulting in waste of power and reducing the power supply efficiency of the fuel cell.

Summary of the invention

Based on this, it is necessary to provide a fuel cell vehicle power system control method, computer equipment and storage medium for the problem of power loss of the transformer connected in series between the fuel cell and the bus to reduce the loss caused by the transformer always connected to the circuit. Improve the power generation efficiency of the fuel cell and save electrical energy.

A fuel cell vehicle power system control method. The fuel cell vehicle power system includes a power cell, a fuel cell, a transformer, and a contactor. The fuel cell is used to communicate with the load and the power battery through the transformer and the bus, respectively. Electrical connection, the power battery is used to supply power to the load and store the electrical energy generated by the fuel cell, the contactor is connected in parallel to the two ends of the transformer, when the fuel cell is at a rated voltage, the fuel cell The voltage of can meet the voltage of the bus, and the method includes:

S10: Detect whether the state of charge of the power battery is within a preset interval;

If the state of charge of the power battery is in the preset interval, execute S20,

S20: close the contactor, and the fuel cell supplies power to the load;

If the state of charge does not belong to the preset interval, execute

S310: When the state of charge is greater than the upper limit of the preset interval, the power battery discharges to the load, and the contactor is opened;

S320: When the state of charge is less than the lower limit value of the preset interval, the fuel cell charges the power battery.

After the step S20, the method further includes:

S210: Keep the state of charge of the power battery in the preset interval.

In some embodiments, after step S310, the method further includes:

Detecting whether the state of charge of the power battery is within a preset interval;

If the state of charge of the power battery is within a preset interval, close the contactor.

In some embodiments, before step S210, the method further includes:

S211: Compare the total power demand of the load with the rated power of the fuel cell;

If the total required power of the load is greater than the rated power of the fuel cell, the power battery discharges to the load;

If the total required power of the load is less than the rated power of the fuel cell, the fuel cell charges the power battery.

In some embodiments, the step S210 further includes:

S211: When the state of charge of the power battery is close to the lower limit of the preset interval, the fuel cell charges the power battery so that the state of charge of the power battery is maintained in the preset interval .

In some embodiments, after the step S211, the method further includes:

Comparing the total power demand of the load with the rated power of the fuel cell;

If the total power demanded by the load is greater than the rated power of the fuel cell, the output power of the fuel cell is increased according to the total power demanded by the load to meet the total power demanded by the load.

In some embodiments, the preset interval is 30%-70%;

The step S211 includes: when the state of charge of the power battery is less than 35%, the fuel cell charges the power battery so that the state of charge of the power battery is maintained in the preset interval.

In some embodiments, the step S210 further includes:

S212: When the state of charge of the power battery is close to the upper limit of the preset interval, the power battery discharges to the load, so that the state of charge of the power battery is maintained in the preset interval.

In some embodiments, after the step S212, the method further includes:

Comparing the total power demand of the load with the rated power of the fuel cell;

If the total required power of the load is less than the rated power of the fuel cell, the output power of the fuel cell is reduced so that the total output power of the power cell and the fuel cell is equal to the total required power of the load.

In some embodiments, the preset interval is 30%-70%;

The step S212 includes: when the state of charge of the power battery is higher than 65%, the power battery discharges to the load, so that the state of charge of the power battery is maintained in the preset interval.

In some embodiments, the step S200 further includes adjusting the power of the fuel cell according to the total power demanded by the load.

In some embodiments, before the step S10, it further includes:

S110: Determine whether the vehicle is in a driving state;

If not, disconnect the contactor;

If yes, the step S10 is executed.

In some embodiments, the driving state includes a constant speed driving state and an acceleration driving state.

In some embodiments, after the step S110, the method further includes:

S120: Determine whether the vehicle is in a high-speed stable working condition;

If yes, execute the step S10;

If not, disconnect the contactor.

In some embodiments, the high-speed stable operating conditions include a constant speed driving state.

In some embodiments, before the step S10, it further includes:

The preset interval is determined according to the self-consistent matching characteristics of the power battery and the fuel cell.

In some embodiments, the determining the preset interval according to the self-consistent matching characteristics of the power battery and the fuel cell includes:

The preset interval is determined according to the rated power of the fuel cell and the self-consistent matching characteristics of the power cell and the fuel cell.

In some embodiments, the absolute value of the slope of the open circuit voltage-state of charge characteristic curve of the power battery is smaller than the absolute value of the slope of the voltage-current characteristic curve of the fuel cell.

A fuel cell vehicle power system control method. The fuel cell vehicle power system includes a power cell, a fuel cell, a transformer, and a contactor. The fuel cell is used to communicate with the load and the power battery through the transformer and the bus, respectively. Electrical connection, the power battery is used to supply power to the load and store the electrical energy generated by the fuel cell, the contactor is connected in parallel to the two ends of the transformer, when the fuel cell is at a rated voltage, the fuel cell The voltage of can meet the voltage of the bus, and the method includes:

S10: Detect whether the state of charge of the power battery is within a preset interval;

If the state of charge of the power battery is in the preset interval, execute S20,

S20: close the contactor, and the fuel cell supplies power to the load;

If the state of charge does not belong to the preset interval, execute

S310: When the state of charge is greater than the upper limit of the preset interval, the power battery discharges to the load, and the contactor is opened;

S320: When the state of charge is less than the lower limit value of the preset interval, the fuel cell charges the power battery, and the contactor is opened.

A computer device includes a memory and a processor. A computer program that can run on the processor is stored on the memory. When the processor executes the computer program, any of the steps of the method is implemented.

A computer-readable storage medium on which a computer program is stored, which when executed by a processor implements any of the steps of the method.

The above fuel cell vehicle power system control method, computer equipment and storage medium can detect whether the state of charge of the power battery is within a preset interval, and if the state of charge of the power battery is within the preset interval, close the The contactor, the fuel cell supplies power to the load. If the state of charge does not belong to the preset interval, when the state of charge is greater than the upper limit of the preset interval, the power battery discharges to the load, and the contactor is opened; When the state of charge is less than the lower limit value of the preset interval, the power battery of the fuel cell is charged, and the contactor is opened. When the state of charge of the power battery is in a preset interval, the fuel cell operates at its rated power, the rated output voltage of the fuel cell can meet the voltage of the bus, and thus the contactor can be closed to turn the transformer Short circuit, the fuel cell directly supplies power to the load through the bus, which can effectively reduce the loss caused by the transformer always connected to the circuit, improve the power generation efficiency of the fuel cell, and save electrical energy.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions in the embodiments or related technologies of the present disclosure, the drawings required for the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings in the following description are only The disclosed embodiments, for those of ordinary skill in the art, can also obtain other drawings based on the disclosed drawings without creative efforts.

1 is a schematic diagram of a fuel cell vehicle power system according to some embodiments of the present disclosure;

2 is a flowchart of a fuel cell vehicle power system control method according to some embodiments of the present disclosure;

3 is a diagram of energy flow when a fuel cell vehicle power system contactor is closed according to some embodiments of the present disclosure;

4 is a diagram of energy flow when a fuel cell vehicle power system contactor is disconnected according to some embodiments of the present disclosure;

FIG. 5 is a corresponding diagram of a fuel cell and a power battery according to some embodiments of the present disclosure;

6 is a flowchart of a fuel cell vehicle power system control method according to other embodiments of the present disclosure;

7 is a flowchart of a fuel cell vehicle power system control method according to yet other embodiments of the present disclosure;

8 is a flowchart of a control method after a fuel cell vehicle power system closes a contactor according to some embodiments of the present disclosure.

DESCRIPTION OF REFERENCE NUMERALS

Fuel cell vehicle power system 10

Fuel cell vehicle power system control method 20

Power battery 110

Fuel cell 120

Transformer 130

Contactor 140

Load 150

Car assembly 151

Electric drive system 152

Bus 160

detailed description

In order to make the purpose, technical solutions and advantages of the present disclosure more clear, the following describes the present disclosure in further detail with examples and drawings. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not intended to limit the present disclosure.

The present disclosure provides a fuel cell vehicle power system control method 20 suitable for the fuel cell vehicle power system 10 shown in FIG. 1. The fuel cell vehicle power system 10 includes a power battery 110, a fuel cell 120, a transformer 130 and a contactor 140. The fuel cell 120 is electrically connected to the load 150 and the power battery 110 through the transformer 130 and the bus 160, respectively. The fuel cell 120 may supply power to the load 150 and/or the power battery 110 through the transformer 130 and the bus 160, respectively. The power battery 110 is used to supply power to the load 150 through the bus 160. The power battery 110 can also store electrical energy generated by the fuel cell 120. The contactor 140 is connected in parallel to both ends of the transformer 130. The transformer 130 may step up or step down the fuel cell 120. It should be understood that the load 150 includes an electric drive system 152 and an automobile assembly 151. The electric drive system 152 may include an electric motor, a motor controller, and a transmission mechanism, which are used to drive the vehicle. In some embodiments, the transformer 130 is connected to the load 150 through a bus 160. In this embodiment, the fuel cell 120 is a high-power fuel cell. When the fuel cell 120 is operating at its rated power, the voltage of the fuel cell 120 may meet the bus 160 voltage. In some embodiments, the fuel cell vehicle power system 10 uses a fuel cell 120 as a main power source, and the power cell 110 as an auxiliary power source. When the power demand of the vehicle is large, for example, in the starting, accelerating or climbing conditions, the fuel cell 120 and the power battery 110 may power the vehicle load 150 together. When the power demand of the vehicle is small, for example, in braking, deceleration or braking conditions, the fuel cell 120 may charge the power battery 110. When the vehicle is in a stable driving condition, the fuel cell 120 may supply power. Referring to FIG. 2, the fuel cell vehicle power system control method 20 includes:

S10, detecting whether the state of charge of the power battery 110 is in a preset interval;

S20, if the state of charge of the power battery 110 is in the preset interval, the contactor 140 is closed, and the fuel cell 120 supplies power to the load 150;

S30, if the state of charge does not belong to the preset interval, then

S310, when the state of charge is greater than the upper limit of the preset interval, when the power battery 110 is discharged to the load 150, the contactor 140 is opened;

S320. When the state of charge is less than the lower limit value of the preset interval, the fuel cell 120 charges the power battery 110.

In some embodiments, after the step S320, the contactor 140 may also be opened. Please refer to FIG. 3, which shows an energy flow diagram when the contactor 140 is closed. As shown in the figure, the contactor 140 is closed, short-circuiting the transformer 130, and the fuel cell 120 can directly supply power to the load 150 and charge the power battery 110. The power battery 110 may also supply power to the load 150.

Please refer to FIG. 4, which shows an energy flow diagram when the contactor 140 is opened. As shown in the figure, the contactor 140 is opened, the transformer 130 is connected to a circuit, and the fuel cell 120 supplies power to the load 150 and charges the power battery 110 through the transformer 130. The power battery 110 may also supply power to the load 150.

In the above embodiment, the preset interval is derived from the self-consistent matching characteristics of the power battery 110 and the fuel cell 120. Please refer to FIG. 5, which shows the correspondence between the volt-ampere characteristic curve of the fuel cell 120 and the open circuit voltage (OCV)-state of charge (SOC) characteristic curve of the power battery 110. The state of charge is the ratio of the remaining capacity of the battery to its fully charged state capacity, usually expressed as a percentage. The value of the state of charge is 0-100%. When the state of charge is 0, the battery is fully discharged; when the state of charge is 100%, the battery is fully charged. In some embodiments, as shown in FIG. 5, when the fuel cell 120 is at a rated power, the fuel cell 120 is at a rated voltage, the rated voltage corresponding to the SOC of the power battery 110 being at a%-b % Interval. That is, a%-b% is set as the preset interval of the state of charge of the power battery 110, a% is the lower limit of the preset interval, and b% is the upper limit of the preset interval. The preset interval of the state of charge of the power battery 110 corresponds to the rated power of the fuel cell 120. Since the fuel cell 120 used in the fuel cell 120 automobile power system is a high-power battery, when the fuel cell 120 is at the rated voltage, the voltage of the fuel cell 120 can meet the bus 160 voltage, and thus The transformer 130 is not required to be pressurized, and the load 150 can be directly powered through the bus 160. It should be understood that in order to make the open circuit voltage of the power battery 110 close to the voltage of the fuel cell 120, the state of charge of the power battery 110 should be within a preset interval. The preset range of the power battery 110 should be wider, so that it can adapt to a larger power variation range of the load 150. In some embodiments, the OCV (open circuit voltage)-SOC (state of charge) characteristic curve of the power battery 110 is more gentle than the UI characteristic curve of the fuel cell 120, so that when the fuel cell 120 is at a rated When the power is used, the power battery 110 has a wider adjustment margin, so that the power demand of the load 150 (especially the automobile assembly 151) changes.

The fuel cell vehicle power system control method 20 provided by the present disclosure indicates that the fuel cell 120 is at rated power when the state of charge is in the preset interval. As mentioned above, since the fuel cell 120 used in the present disclosure is a high-power fuel cell, when the fuel cell 120 is at a rated power, the rated voltage of the fuel cell 120 can meet the voltage of the bus 160 without the need for pressurization . Therefore, the contactor 140 can be closed, and the transformer 130 can be short-circuited, thereby avoiding power loss caused by the transformer 130 always being connected to the circuit, reducing the power generation efficiency of the fuel cell 120, and effectively avoiding the waste of power.

When the state of charge of the power battery 110 is lower than the lower limit of the preset interval, the remaining power of the power battery 110 is too low, and the fuel cell 120 is connected to the transformer 130 to play a boosting role So that the output voltage of the fuel cell 120 is higher than that of the power battery 110, and the fuel cell 120 charges the power battery 110, so that the state of charge of the power battery 110 is restored to the preset interval to protect the power battery .

When the state of charge of the power battery 110 is higher than the upper limit of the preset interval, as shown in FIG. 5, the output voltage of the fuel cell 120 at this time is lower than the voltage across the power battery, that is, low Due to the voltage of the bus 160, it is necessary to disconnect the contactor 140 so that the transformer 130 is connected to the circuit, and the output voltage of the fuel cell 120 is increased by the transformer 130 to be equal to the voltage of the bus 160, and then The fuel cell 120 supplies power to the load 150 through the transformer 130 and the bus 160. The power of the power battery 110 is too high and is discharged to the load 150 through the bus 160 to restore the state of charge to a preset range to protect the power battery 110. When the power of the power battery 110 is too high and is discharged to the bus 160, the state of charge of the power battery 110 decreases, and the open circuit voltage thereof decreases.

Referring to FIG. 6, in some embodiments, after closing the contactor 140 in step S20, the method further includes S210: keeping the state of charge of the power battery 110 in the preset interval. In this embodiment, when the state of charge of the power battery 110 is in the preset interval, the contactor 140 is closed to short-circuit the transformer 130, and the fuel cell 120 directly loads the load through the bus 160 150 power supply. By keeping the state of charge of the power battery 110 in the preset interval, the stability of the power supply of the fuel cell 120 can be further ensured, so that the fuel cell 120 can continuously supply power to the load 150 continuously.

Referring to FIG. 7, in some embodiments, the step S210 further includes:

S200: Compare the total power demand of the load 150 with the rated power of the fuel cell 120;

If the total required power of the load 150 is greater than the rated power of the fuel cell 120, the power battery 110 discharges to the load 150.

In some embodiments, the step S210 further includes S211: when the state of charge of the power battery is close to the lower limit value of the preset interval, the fuel cell charges the power battery so that the power The state of charge of the battery is maintained within the preset interval.

Referring to FIG. 8, in some embodiments, the step S200 further includes adjusting the power of the fuel cell according to the total power required by the load.

In the above embodiment, the state of charge of the power battery 110 is in the preset interval, and the output voltage of the fuel cell 120 is at its rated voltage. The voltage output by the fuel cell 120 may meet the voltage of the bus 160. When the total power demanded by the load 150 is greater than the rated power of the fuel cell 120, the power battery 110 discharges to the load 150 to meet the demand of the load 150. During the discharge of the power battery 110, its state of charge decreases (but not lower than the lower limit of the preset range). At this time, since the state of charge of the power battery 110 is still within its preset range, corresponding to the fuel cell 120 being at its rated power, the output voltage of the fuel cell 120 can meet the bus voltage, and thus can maintain the The contactor 140 is closed, and the fuel cell 120 directly supplies power to the load 150 through the bus 160 without passing through the transformer 130.

When the state of charge of the power battery 110 is close to the lower limit value of the preset interval, the fuel cell 120 charges the power battery 110 so that the state of charge of the power battery 110 is maintained at the pre-charge Set intervals to protect the power battery 110. In some embodiments, if the total power demand of the load 150 is still greater than the output power of the fuel cell 120 at this time, the output power of the fuel cell 120 may be slightly increased according to the total power demand to meet the requirements Describe the total power required.

In some embodiments, the state of charge of the power battery 110 may be 30%-70%. When the state of charge of the power battery 110 reaches 35%, the fuel cell 120 may charge the power battery 110 charging, keeping the state of charge of the power battery 110 within the preset range, away from the lower threshold. As a result, the state of charge of the power battery 110 will not be too low, thereby protecting the power battery 110 from over discharge.

In some embodiments, before step S210, the method further includes:

S200: Compare the total power demand of the load 150 with the rated power of the fuel cell 120;

If the total required power of the load 150 is less than the rated power of the fuel cell 120, the fuel cell 120 charges the power battery 110.

In some embodiments, step S210 further includes when S212: when the state of charge of the power battery 110 is close to the upper limit value of the preset interval, the power battery 110 discharges to the load 150, so that The state of charge of the power battery 110 is maintained in the preset interval.

Referring to FIG. 8, in some embodiments, the step S200 further includes adjusting the power of the fuel cell according to the total power required by the load.

In the above embodiment, the state of charge of the power battery 110 is in the preset interval, and the fuel cell 120 is operating at its rated power. The output power of the fuel cell 120 is its rated power, and the output voltage of the fuel cell 120 is at its rated voltage. The voltage output by the fuel cell 120 can meet the bus 160 voltage. When the total power demand of the load 150 is less than the rated power of the fuel cell 120, the output power of the fuel cell 120 is greater than the total power demand of the load 150, and the remaining power of the fuel cell 120 may be The power battery 110 is charged. During the charging process of the power battery 110, its state of charge increases (but does not exceed the upper limit of the preset range). At this time, since the state of charge of the power battery 110 is still within its preset range, corresponding to the fuel cell 120 being at its rated power, the output voltage of the fuel cell 120 can meet the bus voltage, and thus can maintain the The contactor 140 is closed, and the fuel cell 120 directly supplies power to the load 150 through the bus 160 without passing through the transformer 130. The open circuit voltage of the power battery 110 is slightly increased, and the transformer 130 is not needed.

When the state of charge of the power battery 110 approaches the upper limit of the preset interval, the fuel cell 120 discharges to the load 150 through the bus 160, so that the state of charge of the power battery 110 is maintained In the preset interval, the power battery 110 is protected. At this time, the total power demand of the load 150 is less than the rated power of the fuel cell 120, and the power distribution of the power battery 110 and the fuel cell 120 needs to be adjusted to reduce the output power of the fuel cell 120, so that the The total output power of the power battery 110 and the fuel cell 120 is equal to the total power demand of the load.

In some embodiments, the state of charge of the power battery 110 may be 30%-70%. When the state of charge of the power battery 110 reaches 65%, the fuel cell 120 may pass through the bus 160 Discharge the load 150 to keep the state of charge of the power battery 110 within the preset range, away from the upper limit threshold. Therefore, the state of charge of the power battery 110 is not too high, thereby protecting the power battery 110.

Please refer to FIG. 6 or FIG. 7 again. In some embodiments, the fuel cell vehicle power system control method 20 before the step S10 further includes:

S110: Determine whether the vehicle is in a driving state;

If yes, execute the step S10;

If not, disconnect the contactor.

In the above embodiment, the driving state is relative to the braking state. The braking state includes braking and deceleration, and the driving state includes uniform speed and acceleration. Please refer to FIG. 6 or FIG. 7 again. In some embodiments, after step S110, the method further includes:

S120: Determine whether the vehicle is in a high-speed stable working condition;

If yes, execute the step S10;

If not, disconnect the contactor.

In the above embodiment, the high-speed stable operating condition may include that the vehicle is running at a constant speed, and the total power demand of the load 150 hardly changes, and the vehicle is mainly powered by the fuel cell 120. Due to the reaction principle of the fuel cell 120, its adjustment response speed is slower than that of the power battery 110. In contrast to the high-speed stable operating conditions, the urban operating conditions require frequent acceleration or deceleration when the vehicle is driving under the urban operating conditions, and the required power often changes. Since the fuel cell 120 has a slow adjustment response speed, the urban operating conditions In this case, the power battery 110 mainly supplies power.

It should be understood that the step of determining whether the vehicle is in a high-speed stable operating condition should be before determining whether the state of charge of the power battery is within a preset interval. In some embodiments, if the power battery is in a high state of charge, if a brake is encountered, the output power of the fuel cell is too late to adjust due to the sudden decrease in power demand, so the power battery will also be charged. In another embodiment, if at a stage where the power battery state of charge is very low, if the climb continues, the power of the fuel cell can be increased due to the continued increase in the required power, but it is limited to the fuel cell's Adjusting the upper limit, the output power of the fuel cell is still insufficient to meet the load demand, so the power battery will also be discharged.

In some embodiments, the fuel cell vehicle power system control method 20 may be applicable to heavy trucks. The heavy truck runs on the highway for a long time, and is in the high-speed stable working condition for a long time, so the fuel cell 120 mainly supplies power. The battery cell vehicle power system control method can short-circuit the transformer 130 according to the state of charge of the power battery 110 to reduce the loss caused by the transformer 130, improve the power generation efficiency of the fuel cell 120, and save electricity .

In some embodiments, when the state of charge is greater than the upper limit of the preset interval in S310, the power battery 110 discharges to the load 150, and executes again after opening the contactor 140 The S10 detects whether the state of charge of the power battery 110 is in a preset interval, and loops the above steps to ensure that the contactor 140 is closed when the fuel cell 120 is at its rated voltage.

In some embodiments, when the state of charge is less than the lower limit value of the preset interval in S320, the fuel cell 120 and the power battery 110 are charged, and the contactor 140 is opened again to perform The S10 detects whether the state of charge of the power battery 110 is in a preset interval to ensure that the contactor 140 is closed when the fuel cell 120 is at its rated voltage.

The present disclosure also provides a computer device, including a memory and a processor. A computer program that can run on a processor is stored on the memory, and when the processor executes the computer program, any step of the method is implemented.

The present disclosure also provides a computer-readable storage medium having a computer program stored thereon, which when executed by a processor implements the steps of any one of the methods.

The technical features of the above-mentioned embodiments can be arbitrarily combined. To simplify the description, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered within the scope of this description.

The above-mentioned embodiments only express several implementations of the present disclosure, and their descriptions are more specific and detailed, but they should not be construed as limiting the scope of the disclosed patents. It should be noted that, those of ordinary skill in the art, without departing from the concept of the present disclosure, can also make several variations and improvements, which all fall within the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the appended claims.

Claims (20)

1. A fuel cell vehicle power system control method. The fuel cell vehicle power system includes a power cell, a fuel cell, a transformer, and a contactor. The fuel cell is used to communicate with the load and the power battery through the transformer and the bus, respectively. Electrical connection, the power battery is used to supply power to the load and store the electrical energy generated by the fuel cell, the contactor is connected in parallel to the two ends of the transformer, when the fuel cell is at a rated voltage, the fuel cell The voltage of can meet the voltage of the bus, characterized in that the method includes:

   S10: Detect whether the state of charge of the power battery is within a preset interval;

   If the state of charge of the power battery is in the preset interval, execute S20,

   S20: close the contactor, and the fuel cell supplies power to the load;

   If the state of charge does not belong to the preset interval, execute

   S310: When the state of charge is greater than the upper limit of the preset interval, the power battery discharges to the load, and the contactor is opened;

   S320: When the state of charge is less than the lower limit of the preset interval, the fuel cell charges the power battery;

   After the step S20, the method further includes:

   S210: Keep the state of charge of the power battery in the preset interval.
2. The method for controlling a fuel cell vehicle power system according to claim 1, wherein after step S310, the method further comprises:

   Detecting whether the state of charge of the power battery is within a preset interval;

   If the state of charge of the power battery is within a preset interval, close the contactor.
3. The method for controlling a fuel cell vehicle power system according to claim 1, wherein before the step S210, the method further comprises:

   S200: Compare the total power demand of the load with the rated power of the fuel cell;

   If the total required power of the load is greater than the rated power of the fuel cell, the power battery discharges to the load;

   If the total required power of the load is less than the rated power of the fuel cell, the fuel cell charges the power battery.
4. The fuel cell vehicle power system control method according to claim 3, wherein the step S210 further comprises:

   S211: When the state of charge of the power battery is close to the lower limit of the preset interval, the fuel cell charges the power battery so that the state of charge of the power battery is maintained in the preset interval .
5. The fuel cell vehicle power system control method according to claim 4, wherein after the step S211, further comprising:

   Comparing the total power demand of the load with the rated power of the fuel cell;

   If the total power demanded by the load is greater than the rated power of the fuel cell, the output power of the fuel cell is increased according to the total power demanded by the load to meet the total power demanded by the load.
6. The fuel cell vehicle power system control method according to claim 4, wherein:

   The step S211 includes: when the state of charge of the power battery is less than 35%, the fuel cell charges the power battery so that the state of charge of the power battery is maintained in the preset interval.
7. The fuel cell vehicle power system control method according to claim 3, wherein the step S210 further comprises:

   S212: When the state of charge of the power battery is close to the upper limit of the preset interval, the power battery discharges to the load, so that the state of charge of the power battery is maintained in the preset interval.
8. The fuel cell vehicle power system control method according to claim 7, wherein after the step S212, further comprising:

   Comparing the total power demand of the load with the rated power of the fuel cell;

   If the total required power of the load is less than the rated power of the fuel cell, the output power of the fuel cell is reduced so that the total output power of the power cell and the fuel cell is equal to the total required power of the load.
9. The fuel cell vehicle power system control method according to claim 7, wherein:

   The step S212 includes: when the state of charge of the power battery is higher than 65%, the power battery discharges to the load, so that the state of charge of the power battery is maintained in the preset interval.
10. The fuel cell vehicle power system control method according to claim 3, wherein the step S200 further includes adjusting the power of the fuel cell according to the total power demanded by the load.
11. The fuel cell vehicle power system control method according to claim 1, wherein before the step S10, further comprising:

    S110: Determine whether the vehicle is in a driving state;

    If yes, execute the step S10;

    If not, disconnect the contactor.
12. The fuel cell vehicle power system control method according to claim 11, wherein the driving state includes a constant speed driving state and an acceleration driving state.
13. The fuel cell vehicle power system control method according to claim 11, wherein after the step S110, further comprising:

    S120: Determine whether the vehicle is in a high-speed stable working condition;

    If yes, execute the step S10;

    If not, disconnect the contactor.
14. The fuel cell vehicle power system control method according to claim 13, wherein the high-speed stable operating condition includes a constant-speed driving state.
15. The fuel cell vehicle power system control method according to claim 1, wherein before the step S10, further comprising:

    The preset interval is determined according to the self-consistent matching characteristics of the power battery and the fuel cell.
16. The fuel cell vehicle power system control method according to claim 15, wherein the determining the preset interval according to the self-consistent matching characteristics of the power cell and the fuel cell includes:

    The preset interval is determined according to the rated power of the fuel cell and the self-consistent matching characteristics of the power cell and the fuel cell.
17. The fuel cell vehicle power system control method according to claim 1, wherein the absolute value of the slope of the open circuit voltage-state of charge characteristic curve of the power battery is less than the absolute value of the slope of the voltage-current characteristic curve of the fuel cell value.
18. A fuel cell vehicle power system control method. The fuel cell vehicle power system includes a power cell, a fuel cell, a transformer, and a contactor. The fuel cell is used to communicate with the load and the power battery through the transformer and the bus, respectively. Electrical connection, the power battery is used to supply power to the load and store the electrical energy generated by the fuel cell, the contactor is connected in parallel to the two ends of the transformer, when the fuel cell is at a rated voltage, the fuel cell The voltage of can meet the voltage of the bus, characterized in that the method includes:

    S10: Detect whether the state of charge of the power battery is within a preset interval;

    If the state of charge of the power battery is in the preset interval, execute S20,

    S20: close the contactor, and the fuel cell supplies power to the load;

    If the state of charge does not belong to the preset interval, execute

    S310: When the state of charge is greater than the upper limit of the preset interval, the power battery discharges to the load, and the contactor is opened;

    S320: When the state of charge is less than the lower limit value of the preset interval, the fuel cell charges the power battery, and the contactor is opened.
19. A computer device, including a memory and a processor, a computer program that can be run on the processor is stored on the memory, characterized in that when the processor executes the computer program, any one of claims 1 to 17 is implemented Item of the method.
20. A computer-readable storage medium on which a computer program is stored, characterized in that when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 17 are realized.

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