CN112776670B - Battery control method and system and vehicle - Google Patents
Battery control method and system and vehicle Download PDFInfo
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- CN112776670B CN112776670B CN201911089872.9A CN201911089872A CN112776670B CN 112776670 B CN112776670 B CN 112776670B CN 201911089872 A CN201911089872 A CN 201911089872A CN 112776670 B CN112776670 B CN 112776670B
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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 battery control method, a battery control system and a vehicle, wherein the battery control method is applied to the vehicle, the vehicle comprises a high-voltage battery, a fuel battery and electric equipment, the fuel battery is respectively connected with the high-voltage battery and the electric equipment, and the high-voltage battery is connected with the electric equipment. In the embodiment of the invention, the larger the difference between the current state of charge of the high-voltage battery and the target value is, the larger the power of the fuel battery for charging the high-voltage battery is, so that the state of charge value of the high-voltage battery can be maintained at the target value, the high-voltage battery is ensured to have enough power output to meet the requirement of a driver when a high-power request is made next time, and the conditions of poor power response effect and long response time caused by unreasonable battery power distribution strategy can be effectively relieved.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a battery control method, a battery control system and a vehicle.
Background
Currently, with the increasing severity of global environmental protection problems, green new energy automobiles are rapidly developed. The fuel cell electric automobile is a new energy automobile, the power of the fuel cell electric automobile is mainly provided by a fuel cell, the fuel cell electric automobile is assisted by a high-voltage battery, the hydrogen fuel type is mainly used, the fuel cell electric automobile is a vehicle which really realizes zero emission, pure water is emitted, and the fuel cell electric automobile has the advantages of no pollution and zero emission.
The fuel cell electric automobile meets different driving requirements under various road conditions by controlling the power output of the fuel cell system and the high-voltage battery. In the prior art, when the state of charge value of the high-voltage battery is lower than the lower limit value, the fuel cell charges the high-voltage battery at a fixed power. Therefore, under the working condition that the state of charge value of the high-voltage battery is slightly higher than the lower limit value, if the power requested by a driver rises greatly in a short time, the situation that the discharging power of the high-voltage battery cannot compensate the difference value between the actual discharging power and the requested power in the power rising process of the fuel cell occurs, so that the requested power request cannot be met, the situations of poor power response effect and long response time occur, and the inconvenience is brought to the driver.
Disclosure of Invention
In view of this, the present invention aims to provide a battery control method, a system and a vehicle, so as to solve the problems that the battery power distribution strategy of the existing fuel cell electric vehicle is unreasonable, the power response effect is poor and the response time is long.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a battery control method is applied to a vehicle, the vehicle comprises a high-voltage battery, a fuel battery and electric equipment, the fuel battery is respectively connected with the high-voltage battery and the electric equipment, and the high-voltage battery is connected with the electric equipment, wherein the method comprises the following steps:
controlling the fuel cell to drive the electric equipment to enable the working power of the electric equipment to reach a first power value;
if the working power of the electric equipment is increased from the first power value to a second power value and the increment of the working power exceeds a preset threshold value, controlling the high-voltage battery and the fuel battery to drive the electric equipment together;
after the high-voltage battery and the fuel battery jointly drive the electric equipment, controlling the state of charge value of the high-voltage battery to be maintained in a preset range by adjusting the output power of the fuel battery;
wherein the power output by the fuel cell for charging the high-voltage battery increases as a difference between a current state of charge value of the high-voltage battery and a target value, the target value being within the preset range.
Further, in the battery control method, the step of controlling the state of charge value of the high-voltage battery to be maintained within a preset range by adjusting the output power of the fuel cell after the high-voltage battery and the fuel cell jointly drive the electric equipment includes:
after the high-voltage battery and the fuel cell jointly drive the electric equipment, controlling the fuel cell to increase the output power to the second power value, and controlling the fuel cell to charge the high-voltage battery, so that the state of charge value of the high-voltage battery is increased;
and when the state of charge value of the high-voltage battery is within the preset range, controlling the fuel battery to drive the electric equipment according to the second power value, and stopping charging the high-voltage battery.
Further, in the battery control method, when the state of charge value of the high-voltage battery is within the preset range, the step of controlling the fuel cell to drive the electric device according to the second power value and stopping charging the high-voltage battery includes:
when the state of charge value of the high-voltage battery reaches the target value, controlling the fuel battery to drive the electric equipment according to the second power value, and stopping charging the high-voltage battery; wherein the target value is a middle value in the preset range.
Further, the battery control method may further include, after the step of controlling the fuel cell to increase the output power to drive the electric device at the second power value and simultaneously charge the high-voltage battery so that the state of charge value of the high-voltage battery increases after the step of controlling the fuel cell to increase the output power to drive the electric device at the second power value, the method further includes:
and if the working power of the electric equipment is reduced to a third power value, when the state of charge value of the high-voltage battery reaches the target value, adjusting the output power of the fuel battery to the third power value, wherein the third power value is smaller than the second power value.
Further, in the battery control method, after the step of adjusting the output power of the fuel cell to a third power value when the state of charge value of the high-voltage battery reaches a target value if the operating power of the electric device is reduced to the third power value, the method further includes:
if the state of charge value of the high-voltage battery reaches an upper limit value, controlling the fuel battery to stop running, and driving the electric equipment by the high-voltage battery, wherein the upper limit value is the maximum value in the preset range;
and when the fuel cell stops operating and the state of charge value of the high-voltage battery is lower than a lower limit value, controlling the fuel cell to recover to operate, and controlling the fuel cell to increase output power so as to drive the electric equipment and charge the high-voltage battery, wherein the lower limit value is the minimum value in the preset range.
Further, before the step of driving the electrical device by the fuel cell to make the operating power of the electrical device reach the first power value, the battery control method further includes:
and if a starting instruction is acquired, controlling the fuel cell and the high-voltage battery to be started, and driving the electric equipment by the fuel cell and the high-voltage battery together within a preset time.
Further, in the battery control method, if a start instruction is obtained, the fuel cell and the high-voltage battery are controlled to be started, and after the fuel cell and the high-voltage battery jointly drive the electric device within a preset time, the method further includes:
and after the preset time, controlling the high-voltage battery to be closed.
Another object of the present invention is to provide a battery control system applied to a vehicle, the vehicle including a high voltage battery, a fuel cell, and an electric device, the fuel cell being connected to the high voltage battery and the electric device, respectively, and the high voltage battery being connected to the electric device, wherein the system includes:
the first control module is used for controlling the fuel cell to drive the electric equipment so that the working power of the electric equipment reaches a first power value;
the second control module is used for controlling the high-voltage battery and the fuel battery to drive the electric equipment together if the working power of the electric equipment is increased from the first power value to a second power value and the increment of the working power exceeds a preset threshold value;
the third control module is used for controlling the state of charge value of the high-voltage battery to be maintained in a preset range by adjusting the output power of the fuel cell after the high-voltage battery and the fuel cell jointly drive the electric equipment;
wherein the power output by the fuel cell for charging the high-voltage battery increases as the difference between the current state of charge value of the high-voltage battery and a target value increases, the target value being within the preset range.
Further, in the system, the third control module includes:
the first control unit is used for controlling the fuel cell to increase the output power to the second power value and controlling the fuel cell to charge the high-voltage battery after the high-voltage battery and the fuel cell jointly drive the electric equipment, so that the state of charge value of the high-voltage battery is increased;
and the second control unit is used for controlling the fuel cell to drive the electric equipment according to the second power value and stopping charging the high-voltage battery when the state of charge value of the high-voltage battery is within the preset range.
Further, in the system, the second control unit is specifically configured to control the fuel cell to drive the electrical equipment at the second power value and stop charging the high-voltage battery when the state of charge value of the high-voltage battery reaches the target value; wherein the target value is a middle value in the preset range.
Further, the system further comprises:
and the fourth control module is configured to adjust the output power of the fuel cell to a third power value when the state of charge value of the high-voltage battery reaches the target value if the operating power of the electric device is reduced to the third power value, where the third power value is smaller than the second power value.
Further, the system further comprises:
the fifth control module is used for controlling the fuel cell to stop running and driving the electric equipment by the high-voltage battery if the state of charge value of the high-voltage battery reaches an upper limit value, wherein the upper limit value is the maximum value in the preset range;
and the sixth control module is used for controlling the fuel cell to recover to operate and controlling the fuel cell to increase the output power so as to drive the electric equipment and charge the high-voltage battery when the fuel cell stops operating and the state of charge value of the high-voltage battery is lower than a lower limit value, wherein the lower limit value is the minimum value in the preset range.
Further, the system further comprises:
and the starting module is used for controlling the fuel cell and the high-voltage battery to be started if a starting instruction is obtained, and the fuel cell and the high-voltage battery jointly drive the electric equipment within preset time.
Further, in the system, the starting module is further configured to control the high voltage battery to be turned off after the preset time.
Compared with the prior art, the battery control method and the battery control system have the following advantages:
after the high-voltage battery and the fuel cell jointly drive the electric equipment, the state of charge value of the high-voltage battery is controlled to be maintained within a preset range by adjusting the output power of the fuel cell, and the power output by the fuel cell and used for charging the high-voltage battery is controlled to be increased along with the increase of the difference value between the current state of charge of the high-voltage battery and a target value, wherein the target value is within the preset range. The larger the difference between the current state of charge of the high-voltage battery and the target value is, the larger the power of the fuel battery for charging the high-voltage battery is, so that the state of charge value of the high-voltage battery can be maintained at the target value, the high-voltage battery is ensured to have enough power output to meet the requirement of a driver when a high-power request is made next time, and the situations of poor power response effect and long response time caused by unreasonable battery power distribution strategy can be effectively relieved.
It is a further object of the present invention to provide a vehicle, wherein the vehicle includes the battery control system.
The vehicle and the battery control method and system have the same advantages compared with the prior art, and are not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic flow chart of a battery control method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a battery control method according to another embodiment of the present invention;
FIG. 3 is a diagram showing the relationship between the driving condition of the vehicle and the conditions of the fuel cell and the high voltage battery according to the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a battery control system according to an embodiment of the present invention.
Detailed Description
Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While embodiments of the present application are illustrated in the accompanying drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, fig. 1 shows a schematic flow chart of a battery control method provided in an embodiment of the present invention, which is applied to a vehicle, where the vehicle includes a high-voltage battery, a fuel cell, and an electric device, the fuel cell is respectively connected to the high-voltage battery and the electric device, and the high-voltage battery is connected to the electric device, and the method includes steps S100 to S300. In practical use, the electric device comprises a motor and the like.
And S100, controlling the fuel cell to drive the electric equipment, so that the working power of the electric equipment reaches a first power value.
In step S100, the first power value is the current power demand of the electric device, and the current power demand is the power required by the driver to drive the vehicle. That is, in the embodiment of the present invention, the final purpose is to control the operating power of the electric device driven by the fuel cell to the currently required power.
Step S200, if the working power of the electric equipment is increased from the first power value to a second power value and the increment of the working power exceeds a preset threshold value, controlling the high-voltage battery and the fuel battery to drive the electric equipment together.
In the above step S200, the above preset threshold is preset in accordance with the actual output power adjustment performance of the fuel cell. Because the fuel cell has the problems of slow starting response and poor output characteristics, when the currently required working power of the electric equipment is increased from a smaller first power value to a larger second power value, the fuel cell cannot rapidly adjust the output power from the first power value to the second power value. In other words, in order to meet the operating requirement of the electrical equipment, the output power of the fuel cell is adjusted from the first power value to the second power value for a period of time, and in this period of time, the actual power output by the fuel cell cannot meet the requirement of the electrical equipment, and at this time, the high-voltage battery is required to output electric energy to the electrical equipment, so as to fill the difference between the actual power output by the fuel cell and the second power value, and enable the electric energy input into the electrical equipment to reach the second power value.
When the working power of the electric equipment is not increased or the increase amplitude does not reach the preset threshold value, the fuel cell can respond to the change amplitude of the power, so that the electric energy output by the fuel cell can be directly controlled to be driven, the high-voltage battery is not needed to supply power to the electric equipment, and the high-voltage battery is not needed to assist the fuel cell to drive the electric equipment to work.
Step S300, after the high-voltage battery and the fuel cell jointly drive the electric equipment, controlling the state of charge value of the high-voltage battery to be maintained within a preset range by adjusting the output power of the fuel cell; wherein the power output by the fuel cell for charging the high-voltage battery increases as a difference between a current state of charge value of the high-voltage battery and a target value, the target value being within the preset range.
In the step S300, since the high voltage battery is a storage battery, after the high voltage battery and the fuel cell jointly drive the electric device, the electric energy stored inside the storage battery is inevitably reduced, and accordingly, the state of charge value is reduced. In order to ensure that the high-voltage battery can always compensate the difference between the actual output power of the fuel cell and the working power required by the electric equipment, it is necessary to ensure that the state of charge value of the high-voltage battery is within a preset range, where the preset range is a range determined in advance according to the conditions of the electric equipment, the fuel cell and the high-voltage battery of an actual vehicle. Only if the state of charge value of the high-voltage battery is within the preset range, the high-voltage battery can always compensate the difference between the actual output power of the fuel cell and the required working power of the electric equipment.
In order to control the soc of the high-voltage battery to be maintained within the preset range, the output power of the fuel cell is adjusted to charge the high-voltage battery by using the fuel cell when the soc of the high-voltage battery is smaller than the lower limit of the preset range, so that the soc of the high-voltage battery is restored within the preset range.
In step S300, when the high-voltage battery is charged by the fuel cell, the fuel cell continues to supply power to the electric device. Meanwhile, when the high-voltage battery is charged by using the fuel cell, the power output by the fuel cell and used for charging the high-voltage battery is controlled to increase along with the increase of the difference value between the current state of charge value of the high-voltage battery and the target value, and the target value is in the preset range. The state of charge value of the high-voltage battery can be recovered to a target value as soon as possible, namely, the state of charge value of the high-voltage battery is recovered to a preset range, so that the auxiliary power output of the high-voltage battery can meet the actual working requirement of electric equipment when a vehicle has a high-power request.
In addition, since the power output by the fuel cell for charging the high-voltage battery increases as the difference between the current state of charge value of the high-voltage battery and the target value increases, correspondingly, the power output by the fuel cell for charging the high-voltage battery decreases as the difference between the current state of charge value of the high-voltage battery and the target value decreases. Therefore, as the fuel cell continuously charges the high-voltage battery, the difference between the current state of charge value and the target value of the high-voltage battery is smaller and smaller, and the power output by the fuel cell for charging the high-voltage battery is also gradually reduced; by the time the difference between the current state of charge value of the high-voltage battery and the target value is zero, the power output by the fuel cell for charging the high-voltage battery is also reduced to zero. Because the fuel cell needs a certain response time for adjusting the output power, if the fuel cell is used for charging the high-voltage battery, the fuel cell is controlled to charge the high-voltage battery according to a fixed power value, so that when the state of charge value of the high-voltage battery reaches a target value, the fuel cell needs to be controlled to stop charging the high-voltage battery instantly, the power output by the fuel cell and originally used for charging the high-voltage battery is controlled to be reduced from a higher value to zero, and the electric energy output by the fuel cell in the process is wasted.
In summary, the battery control method provided in the embodiment of the present invention controls the state of charge value of the high-voltage battery to be maintained within the preset range by adjusting the output power of the fuel cell after the high-voltage battery and the fuel cell jointly drive the electric device, and controls the power output by the fuel cell for charging the high-voltage battery to increase as the difference between the current state of charge of the high-voltage battery and the target value increases, where the target value is within the preset range. The larger the difference between the current state of charge of the high-voltage battery and the target value is, the larger the power of the fuel battery for charging the high-voltage battery is, so that the state of charge value of the high-voltage battery can be maintained at the target value, and the high-voltage battery is ensured to have enough power output to meet the requirement of a driver when a high-power request is made next time, thereby effectively relieving the conditions of poor power response effect and long response time caused by unreasonable battery power distribution strategy, and reducing the waste of electric energy output by the fuel battery.
Referring to fig. 2, fig. 2 shows a flowchart of a preferred embodiment of the present invention, and in the preferred embodiment of the present invention, the battery control method includes steps S201 to S206:
step S201, if a starting instruction is obtained, the fuel cell and the high-voltage battery are controlled to be started, and the fuel cell and the high-voltage battery jointly drive the electric equipment within a preset time.
In step S201, the operating power increment of the electric device does not exceed the preset threshold value in the vehicle starting stage, but in order to avoid the vehicle starting response delay, the electric device is controlled to be started by the fuel cell and the high voltage battery within the preset time and started together. Wherein, the preset time is determined according to the actual response performance of the fuel cell.
And S202, controlling the high-voltage battery to be closed after the preset time.
In step S202, after the fuel cell is started, the fuel cell outputs power alone to maintain the vehicle in the starting state.
Step S203, controlling the fuel cell to drive the electric device, so that the operating power of the electric device reaches a first power value.
The step S203 can refer to the detailed description of the step S100, and is not repeated herein.
And S204, if the working power of the electric equipment is increased from the first power value to a second power value and the increment of the working power exceeds a preset threshold value, controlling the high-voltage battery and the fuel battery to drive the electric equipment together.
The above step S204 can refer to the detailed description of step S200, and is not repeated here.
Step S205, after the high-voltage battery and the fuel cell drive the electric device together, control the fuel cell to increase the output power to the second power value, and control the fuel cell to charge the high-voltage battery, so that the state of charge value of the high-voltage battery is increased.
In step S205, when the operating power of the electrical equipment is increased from the first power value to the second power value, the output power of the fuel cell is adjusted to gradually increase from the first power value to the second power value, because the electrical equipment is driven by the high-voltage battery and the fuel cell together during the process of increasing the output power of the fuel cell from the first power value to the second power value, and the required power of the electrical equipment is relatively stable, the discharge power of the high-voltage battery decreases with the increase of the output power of the fuel cell, and the state of charge value of the high-voltage battery is still decreasing;
when the output power of the fuel cell is increased to a second power value, the high-voltage battery stops supplying power to the electric equipment, the state of charge value of the high-voltage battery stops reducing, and the fuel cell alone supplies power to the electric equipment; when the output power of the fuel cell is increased to the second power value, if the state of charge value of the high-voltage battery is lower than the preset range, the output power of the fuel cell needs to be continuously increased to charge the high-voltage battery, so that the state of charge value of the high-voltage battery is increased, the power output by the fuel cell and used for charging the high-voltage battery is controlled to be increased along with the increase of the difference value between the current state of charge value of the high-voltage battery and a target value, and the target value is within the preset range. Through the steps, the state of charge value of the high-voltage battery can be restored to the target value as soon as possible, so that the auxiliary power output of the high-voltage battery can meet the actual working requirement of electric equipment when a vehicle has a high-power request, and the situation that the electric energy output by the fuel battery is wasted when the power originally used for charging the high-voltage battery is reduced from a higher value to zero in the process of controlling the stop bit of the fuel battery to charge the high-voltage battery can be avoided.
When the output power of the fuel cell is increased to the second power value, if the state of charge value of the high-voltage battery is in the preset range, the fuel cell does not need to be controlled to charge the high-voltage battery.
And S206, when the state of charge value of the high-voltage battery is in the preset range, controlling the fuel battery to drive the electric equipment according to the second power value, and stopping charging the high-voltage battery.
After the fuel cell is controlled to charge the high-voltage battery in step S205, the state of charge value of the high-voltage battery is gradually increased until the state of charge value of the high-voltage battery is recovered to the preset range, which indicates that the high-voltage battery has enough electric energy to compensate for the difference between the actual output power of the fuel cell and the working power required by the electrical equipment, and at this time, the fuel cell does not need to be used to charge the high-voltage battery. Therefore, in step S206, when the state of charge value of the high-voltage battery is within the preset range, the fuel cell is controlled to drive the electrical equipment at the second power value and stop charging the high-voltage battery, that is, the fuel cell only outputs the power required by the current operation of the electrical equipment, and does not output the power for charging the high-voltage battery any more.
Optionally, the step S206 includes: when the state of charge value of the high-voltage battery reaches the target value, controlling the fuel battery to drive the electric equipment according to the second power value, and stopping charging the high-voltage battery; wherein the target value is a middle value in the preset range. When the state of charge value of the high-voltage battery reaches the intermediate value in the preset range, the fuel battery is controlled to stop charging the high-voltage battery, so that the high-voltage battery can have enough electric energy to compensate the difference between the actual output power of the fuel battery and the working power required by the electric equipment when the required power increment of the electric equipment at the next time exceeds the preset threshold, and meanwhile, the high-voltage battery still has enough capacity to recover the redundant electric energy output by the fuel battery in the process of adjusting the output power.
Optionally, as shown in fig. 2, after step S205, the battery control method according to the embodiment of the present invention further includes step S207: and if the working power of the electric equipment is reduced to a third power value, when the state of charge value of the high-voltage battery reaches a target value, adjusting the output power of the fuel battery to the third power value, wherein the third power value is smaller than the second power value.
In step S207, when the fuel cell alone drives the electrical device at the second power value and charges the high-voltage battery, and the operating power of the electrical device suddenly drops from the second power value to the third power value, the fuel cell is controlled to control a part of the power used for driving the electrical device to be changed to charge the high-voltage battery, and the electrical device is driven at the third power value, and when the state of charge value of the high-voltage battery reaches the target value, the fuel cell is controlled to stop charging the high-voltage battery, and the output power of the fuel cell is controlled to be only the third power value used for driving the electrical device. Of course, the power output by the fuel cell for charging the high-voltage battery can still be controlled to increase as the difference between the current state of charge value of the high-voltage battery and the target value increases.
Optionally, after step S207, steps S208 to S209 are further included:
step S208, if the state of charge value of the high-voltage battery reaches an upper limit value, controlling the fuel battery to stop running, and driving the electric equipment by the high-voltage battery, wherein the upper limit value is the maximum value in the preset range;
and S209, when the fuel cell stops running and the state of charge value of the high-voltage battery is lower than a lower limit value, controlling the fuel cell to recover running, and controlling the fuel cell to increase output power so as to drive the electric equipment and charge the high-voltage battery, wherein the lower limit value is the minimum value in the preset range.
In step S208, when the fuel cell alone drives the electrical device at the second power value and charges the high-voltage battery, if the operating power of the electrical device suddenly drops from the second power value to the third power value, a part of the power used by the fuel cell to drive the electrical device is controlled to be changed to charge the high-voltage battery, and the electrical device is driven at the third power value, at this time, the actual power output by the fuel cell should be continuously reduced until the power used for charging the high-voltage battery in the actual power matches the difference between the current state of charge value of the high-voltage battery and the target value, but because the power output by the fuel cell to charge the high-voltage battery is too large, the state of charge value of the high-voltage battery will probably reach the target value when the power used for charging the high-voltage battery in the actual power output by the fuel cell does not drop to the above matching state. And at the moment, the output power of the fuel cell is adjusted to a third power value, but before the output power of the fuel cell is adjusted to the third power value, the fuel cell still outputs electric energy and charges the high-voltage battery, the state of charge value of the high-voltage battery continues to increase, and when the state of charge value of the high-voltage battery exceeds the upper limit value in the preset range, the fuel cell is controlled to stop running, and the high-voltage battery singly discharges to drive the electric equipment, so that the high-voltage battery is prevented from being damaged due to overcharge of the high-voltage battery caused by continuous discharge of the fuel cell.
In step S209, after the fuel cell stops operating and the high-voltage battery drives the electric device alone, the soc value of the high-voltage battery gradually decreases, and when the soc value of the high-voltage battery is lower than the minimum value in the preset range, the fuel cell needs to be restarted to drive the electric device and charge the high-voltage battery until the soc value of the high-voltage battery is restored to the preset range, so as to prevent the high-voltage battery from affecting the next normal start of the high-voltage battery due to over-discharge.
In step S209, when the fuel cell is restarted to drive the electric device and charge the high-voltage battery, the power output by the fuel cell for charging the high-voltage battery may still be controlled to increase as the difference between the current state of charge value and the target value of the high-voltage battery increases.
In practical applications, the step S208 may occur during the sudden parking of the vehicle, and the step S209 may occur during the starting after the parking of the vehicle.
The following is further described with reference to specific driving conditions of the vehicle.
Referring to fig. 3, fig. 3 is a diagram showing the relationship between the driving condition of the vehicle and the conditions of the fuel cell and the high voltage battery.
In fig. 3, M is a vehicle braking state curve, and a is an electric device working power curve; b is the actual output power curve of the fuel cell; c is a target power curve of the fuel cell, the target power is the sum of the working power of the electric equipment and the charging power of the high-voltage battery, and the charging power is matched with the difference value between the current state of charge value and the target value of the high-voltage battery; d is a high-voltage battery output power curve; e is a high-voltage battery charging request power curve, and the charging request power is matched with the difference value between the current state of charge value and the target value of the high-voltage battery; f is the high-voltage battery state of charge value curve.
In fig. 3, between 0 → (1), the vehicle is in an initial steady state, the operating power of the electric device is provided by the fuel cell, the output power of the high-voltage battery is 0, and the state-of-charge value thereof is kept constant, so that the curve f ensures a horizontal state;
at the position (1), the operating power request of the vehicle electric equipment is suddenly increased, and the high-voltage battery needs to increase the output power to assist the fuel cell to meet the actual operating power requirement of the electric equipment, so that at the position (1), the curve a is suddenly pulled upwards, the curve c and the curve d are correspondingly pulled upwards, the curve b is pulled upwards, the curve e is pulled upwards, and the curve f is bent downwards;
during the time period between (1) → (2), the actual output power of the fuel cell continuously increases, the fuel cell and the high voltage cell simultaneously discharge to meet the power requirement of the electric equipment, and the discharge power of the high voltage cell decreases along with the increase of the output power of the fuel cell, and the target power of the fuel cell is the sum of the working power of the electric equipment and the charging power of the high voltage cell, and the charging power is matched with the difference between the current state of charge value and the target value of the high voltage cell, so that the target power of the fuel cell is greater than the actual output power, therefore, during the time period between (1) → (2), the curve d continuously decreases, the curve b and the curve c both pull upwards, and the curve c is located above the curve b;
at the step (2), the output power of the fuel cell can meet the actual working power of the electric equipment, the high-voltage battery is controlled to stop discharging, the state of charge value of the high-voltage battery stops decreasing, at the moment, because the current state of charge value of the high-voltage battery is different from the target value, the target power of the fuel cell is still larger than the actual output power, correspondingly, the curve c is still positioned above the curve b, the curve f stops bending downwards, and the curve d enters a zero value state;
between (2) → (3), the output power of the fuel cell continues to increase, the high-voltage battery is charged, the state of charge value of the high-voltage battery rises, the difference between the target power and the actual output power of the fuel cell continuously decreases, accordingly, the curve c is still located above the curve b, the distance between the curve c and the curve b continuously decreases, and the curve f continuously rises;
at (3), the output power of the fuel cell for charging the high-voltage battery is matched with the difference between the current state of charge value and the target value of the high-voltage battery, at which time the target power of the fuel cell is equal to the actual output power, and accordingly, the curve c coincides with the curve b;
and (3) → (4), the fuel cell continuously outputs power according to the actual working power of the electric equipment and the charging demand of the high-voltage battery, so that the power consumption of the whole vehicle is met, the high-voltage battery is charged at the same time, the state of charge value of the high-voltage battery continuously rises, the difference value between the current state of charge value and the target value of the high-voltage battery continuously decreases, and accordingly, the power output by the fuel cell and used for charging the high-voltage battery also continuously decreases. Thus between (3) → (4), curve f is pulled upward, while curves c and b remain heavy;
at (4), the SOC of the high-voltage battery reaches a target value, the output power of the fuel battery is the working power of the electric equipment, and therefore the curve f enters a horizontal state;
when the voltage is between (4) → (5), the output power of the fuel cell meets the working power of the electric equipment, the high-voltage battery does not discharge, the charge state value of the high-voltage battery is kept unchanged, and the curve f keeps a horizontal state;
it can be seen from the curve M that at the point (5), the vehicle is braked, the working power of the electric equipment is reduced, the output power of the fuel cell is reduced, and the target power of the fuel cell is the minimum discharge power of the fuel cell, at this time, the target power of the fuel cell is smaller than the actual output power, and the fuel cell outputs the surplus power to charge the high-voltage battery, so that the state of charge value of the high-voltage battery starts to rise, and thus the curve c instantly drops to zero, and the curve b starts to drop, and the curve f starts to rise;
between (5) → (6), the actual output power of the fuel cell continuously decreases, and the lower limit value is the minimum discharge power of the fuel cell, and the state of charge value of the high-voltage battery continues to rise due to energy recovery and fuel cell discharge, so that the curve f continuously rises, but the rise amplitude continuously decreases;
when the state of charge value of the high-voltage battery reaches the allowable upper limit value in the starting process of the fuel battery at the position (6), the fuel battery is controlled to stop, the output power of the fuel battery is controlled to become zero, and therefore the curve c is reduced to the zero position;
between (6) → (7), the vehicle continues to brake, the high-voltage battery continues to rise in state of charge due to recovery of electrical energy during shutdown of the fuel cell, and the fuel cell remains inoperative; the curve f thus continues to maintain an ascending trend;
it can be seen from curve M that at (7), the vehicle stops braking, the operating power of the consumer increases, and thus curve c rises instantaneously, and accordingly curve d also rises instantaneously, while curve f starts to fall, and curve b remains at 0;
when the voltage is between (7) → (8), the high-voltage battery is singly discharged to meet the working power of the electric equipment, the state of charge value of the high-voltage battery is continuously reduced due to the discharge, so that the curve f is continuously reduced, and the curve e is continuously increased;
at (8), the state of charge value of the high-voltage battery reaches the lower limit value allowed by the single operation, and the fuel cell starts to start;
between (8) → (9), the fuel cell is in start-up, the high-voltage battery continues to discharge to meet the operating power demand of the electric equipment, the curve f continues to fall, and the curve e continues to rise;
at (9), the fuel cell is started successfully, the output power of the fuel cell starts to increase, and at this time, because the target power of the fuel cell is the sum of the operating power of the electric equipment and the charging power of the high-voltage battery, the charging power is matched with the difference between the current state of charge value and the target value of the high-voltage battery, and therefore the target power of the fuel cell is larger than the actual output power, the curve b starts to increase, the curve c slowly increases, the curve c is located above the curve b, and the curve d starts to decrease;
between (9) → r, the high-voltage battery discharge power decreases as the fuel cell discharge power increases, the high-voltage battery state-of-charge value decreases in a decreasing tendency, and thus the curve f continues to decrease but the decreasing curve continues to decrease. At this time, the current state of charge value of the high-voltage battery is different from the target value, and the target power of the fuel battery is still larger than the actual output power, so the curve b keeps rising, and the curve c keeps continuously keeping above the curve b;
at the position (r), the discharge power of the fuel cell reaches the working power currently required by the electric equipment, the fuel cell drives the electric equipment independently, the high-voltage battery stops discharging, the state of charge value of the high-voltage battery stops reducing, but at the moment, because the difference value between the current state of charge value and the target value of the high-voltage battery reaches an extreme value state, the target power of the fuel cell correspondingly reaches the extreme value state, and the target power is still larger than the actual output power; thus, curve f reaches the trough, curve e reaches the peak, curve c stops rising, curve b continues rising, and curve d enters a zero state.
In → r
During the period, the discharge power of the fuel cell is continuously increased, the high-voltage battery is charged while the working power required by the electric equipment is met, the charge state value of the high-voltage battery starts to increase, the target power of the fuel cell is continuously reduced, and the difference between the target power and the actual output power of the fuel cell is continuously reduced; and thus in r →
In between, curves c and e begin to fall, curve b continues to rise, and curve f begins to rise;
in that
When the power is required, the discharge power of the fuel cell meets the power required by the whole vehicle, the output power of the fuel cell for charging the high-voltage battery is matched with the difference value between the current state of charge value and the target value of the high-voltage battery, and then the target power of the fuel cell is equal to the actual output power. Thus is at
When the curve c is in the middle, the curve c is superposed with the curve b, while the curve f continues to rise, but the trend begins to slow down;
in that
Meanwhile, the required power of the whole vehicle is reduced along with the increase of the state of charge value of the high-voltage battery, wherein the fuel battery continuously outputs power according to the actual working power of the electric equipment and the charging requirement of the high-voltage battery to meet the power consumption of the whole vehicle, the high-voltage battery is charged, the state of charge value of the high-voltage battery continuously increases, the difference value between the current state of charge value and the target value of the high-voltage battery continuously decreases, and correspondingly, the power output by the fuel battery and used for charging the high-voltage battery also continuously decreases; thus is at
In between, curves b, c and e all decline, while curve f continues to rise and the rising trend slows down;
in that
When the charge state value of the high-voltage battery reaches the target value, the fuel battery stops charging for the high-voltage point, the discharge power of the fuel battery meets the working power of the electric equipment, the curves b and c are in a horizontal state, and the curve f is also in a horizontal stateThe horizontal state is entered and curve e enters the zero state.
Wherein the rate of change of fuel cell output power is limited by its own performance in the processes (1) → (3), (5) → (6), (9) → r.
Compared with the prior art, the battery control method has the following advantages:
after the high-voltage battery and the fuel cell jointly drive the electric equipment, controlling the power output by the fuel cell and used for charging the high-voltage battery to increase along with the increase of the difference value between the current charge state of the high-voltage battery and the target value; meanwhile, if the state of charge value of the high-voltage battery reaches an upper limit value, controlling the fuel battery to stop running, and driving the electric equipment by the high-voltage battery, wherein the upper limit value is the maximum value in the preset range; and then controlling the fuel cell to resume operation when the fuel cell stops operating and the state of charge value of the high-voltage battery is lower than a lower limit value. By utilizing the battery control method provided by the embodiment of the invention, the state of charge value of the high-voltage battery can be maintained in the preset range, the high-voltage battery is ensured to have enough power output to meet the requirements of a driver when a high-power request is made next time, the conditions of poor power response effect and long response time caused by unreasonable battery power distribution strategy can be effectively relieved, the waste of the output electric energy of the fuel battery can be reduced, and the damage of the high-voltage battery caused by overcharge of the fuel battery can be prevented.
Another object of the present invention is to provide a battery control system applied to a vehicle, the vehicle including a high voltage battery, a fuel cell and an electric device, the fuel cell being respectively connected to the high voltage battery and the electric device, the high voltage battery being connected to the electric device, as shown in fig. 3, the system including:
the first control module 10 is configured to control the fuel cell to drive the electrical device, so that the operating power of the electrical device reaches a first power value;
the second control module 20 is configured to control the high-voltage battery and the fuel cell to jointly drive the electrical equipment if the working power of the electrical equipment is increased from the first power value to a second power value and the increment of the working power exceeds a preset threshold;
the third control module 30 is configured to control the state of charge value of the high-voltage battery to be maintained within a preset range by adjusting the output power of the fuel cell after the high-voltage battery and the fuel cell jointly drive the electric device;
wherein the power output by the fuel cell for charging the high-voltage battery increases as the difference between the current state of charge value of the high-voltage battery and a target value increases, the target value being within the preset range.
This application the system, at the consumer the operating power by first power value increases to the second power value, and when the appreciation of above-mentioned operating power exceeded and predetermine the threshold value, utilize second control module 20 control high-voltage battery and fuel cell to drive the consumer jointly, then adjust fuel cell's output through third control module 30, the state of charge value of control high-voltage battery maintains in predetermineeing the within range, and the power that is used for high-voltage battery charging of control fuel cell output increases along with the increase of the difference of high-voltage battery present state of charge and target value, and this target value is in predetermine the within range. The larger the difference value between the current state of charge and the target value of the high-voltage battery is, the larger the power of the fuel battery for charging the high-voltage battery is, so that the state of charge value of the high-voltage battery can be maintained at the target value, and the high-voltage battery can be ensured to have enough power output to meet the requirement of a driver when a high-power request is made next time, thereby effectively relieving the conditions of poor power response effect and long response time caused by unreasonable battery power distribution strategy, and reducing the waste of electric energy output by the fuel battery.
Optionally, in the system, the third control module 30 includes:
the first control unit is used for controlling the fuel cell to increase the output power to the second power value and controlling the fuel cell to charge the high-voltage battery after the high-voltage battery and the fuel cell jointly drive the electric equipment, so that the state of charge value of the high-voltage battery is increased;
and the second control unit is used for controlling the fuel cell to drive the electric equipment according to the second power value and stopping charging the high-voltage battery when the state of charge value of the high-voltage battery is within the preset range.
Further, in the system, the second control unit is specifically configured to control the fuel cell to drive the electrical equipment at the second power value and stop charging the high-voltage battery when the state of charge value of the high-voltage battery reaches the target value; wherein the target value is a middle value in the preset range.
Optionally, the system further includes:
and the fourth control module is configured to adjust the output power of the fuel cell to a third power value when the state of charge value of the high-voltage battery reaches the target value if the operating power of the electric device is reduced to the third power value, where the third power value is smaller than the second power value.
Optionally, the system further includes:
the fifth control module is used for controlling the fuel cell to stop running and driving the electric equipment by the high-voltage battery if the state of charge value of the high-voltage battery reaches an upper limit value, wherein the upper limit value is the maximum value in the preset range;
and the sixth control module is used for controlling the fuel cell to recover the operation when the fuel cell stops operating and the state of charge value of the high-voltage battery is lower than a lower limit value, and controlling the fuel cell to increase the output power so as to drive the electric equipment and charge the high-voltage battery, wherein the lower limit value is the minimum value in the preset range.
Optionally, the system further includes:
and the starting module is used for controlling the fuel cell and the high-voltage battery to be started if a starting instruction is obtained, and the fuel cell and the high-voltage battery jointly drive the electric equipment within a preset time.
Optionally, in the system, the starting module is further configured to control the high-voltage battery to be turned off after the preset time.
It is a further object of the present invention to provide a vehicle, wherein the vehicle includes the above battery control system.
The technical details and benefits of the system and vehicle described above have been set forth in detail in the above-described method and will not be described again.
In summary, the present application provides a battery control method, a battery control system, and a vehicle, after a high-voltage battery and a fuel cell jointly drive an electric device, by adjusting output power of the fuel cell, the state of charge value of the high-voltage battery is controlled to be maintained within a preset range, and power output by the fuel cell and used for charging the high-voltage battery is controlled to increase along with an increase of a difference between a current state of charge of the high-voltage battery and a target value, where the target value is within the preset range. Because the larger the difference between the current state of charge of the high-voltage battery and the target value is, the larger the power of the fuel battery for charging the high-voltage battery is, the state of charge value of the high-voltage battery can be maintained at the target value, and the high-voltage battery can be ensured to have enough power output to meet the requirement of a driver when a high-power request is made next time, so that the situations of poor power response effect and long response time caused by unreasonable battery power distribution strategy can be effectively relieved.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A battery control method is applied to a vehicle, the vehicle comprises a high-voltage battery, a fuel cell and electric equipment, the fuel cell is respectively connected with the high-voltage battery and the electric equipment, and the high-voltage battery is connected with the electric equipment, and the method is characterized by comprising the following steps:
controlling the fuel cell to drive the electric equipment to enable the working power of the electric equipment to reach a first power value;
if the working power of the electric equipment is increased from the first power value to a second power value and the increment of the working power exceeds a preset threshold value, controlling the high-voltage battery and the fuel battery to drive the electric equipment together;
after the high-voltage battery and the fuel cell jointly drive the electric equipment, controlling the fuel cell to increase the output power to the second power value, and controlling the fuel cell to charge the high-voltage battery, so that the state of charge value of the high-voltage battery is increased;
if the working power of the electric equipment is reduced to a third power value, when the state of charge value of the high-voltage battery reaches a target value, the output power of the fuel battery is adjusted to the third power value, wherein the third power value is smaller than the second power value;
if the state of charge value of the high-voltage battery reaches an upper limit value, controlling the fuel battery to stop running, and driving the electric equipment by the high-voltage battery, wherein the upper limit value is the maximum value in a preset range;
when the fuel cell stops running and the state of charge value of the high-voltage battery is lower than a lower limit value, controlling the fuel cell to recover running, and performing a step of controlling the fuel cell to increase output power so as to drive the electric equipment and charge the high-voltage battery, wherein the lower limit value is the minimum value in the preset range;
when the state of charge value of the high-voltage battery is within the preset range, controlling the fuel battery to drive the electric equipment according to the second power value, and stopping charging the high-voltage battery; wherein the power output by the fuel cell for charging the high-voltage battery increases as a difference between a current state of charge value of the high-voltage battery and a target value, the target value being within the preset range.
2. The battery control method according to claim 1, wherein the step of controlling the fuel cell to drive the electric device at the second power value and stop charging the high-voltage battery when the state of charge value of the high-voltage battery is within the preset range comprises:
when the state of charge value of the high-voltage battery reaches the target value, controlling the fuel battery to drive the electric equipment according to the second power value, and stopping charging the high-voltage battery; wherein the target value is a middle value in the preset range.
3. The battery control method according to claim 1, further comprising, before the step of driving the electric device by the fuel cell to make the operating power of the electric device reach the first power value:
if a starting instruction is acquired, controlling the fuel cell and the high-voltage battery to be started, and driving the electric equipment by the fuel cell and the high-voltage battery together within a preset time;
if the starting instruction is obtained, the fuel cell and the high-voltage battery are controlled to be started, and after the fuel cell and the high-voltage battery jointly drive the electric equipment within the preset time, the method further comprises the following steps:
and after the preset time, controlling the high-voltage battery to be closed.
4. The utility model provides a battery control system, is applied to the vehicle, the vehicle includes high voltage battery, fuel cell and consumer, fuel cell respectively with high voltage battery reaches the consumer is connected, high voltage battery with the consumer is connected, its characterized in that, the system includes:
the first control module is used for controlling the fuel cell to drive the electric equipment so that the working power of the electric equipment reaches a first power value;
the second control module is used for controlling the high-voltage battery and the fuel battery to jointly drive the electric equipment if the working power of the electric equipment is increased from the first power value to a second power value and the increment of the working power exceeds a preset threshold value;
the third control module is used for controlling the state of charge value of the high-voltage battery to be maintained in a preset range by adjusting the output power of the fuel cell after the high-voltage battery and the fuel cell jointly drive the electric equipment;
wherein the power output by the fuel cell for charging the high-voltage battery increases with an increase in the difference between the current state of charge of the high-voltage battery and a target value, the target value being within the preset range;
the third control module includes:
the first control unit is used for controlling the fuel cell to increase the output power to the second power value and controlling the fuel cell to charge the high-voltage battery after the high-voltage battery and the fuel cell jointly drive the electric equipment, so that the state of charge value of the high-voltage battery is increased;
the second control unit is used for controlling the fuel cell to drive the electric equipment according to the second power value and stopping charging the high-voltage battery when the state of charge value of the high-voltage battery is within the preset range;
further comprising:
the fourth control module is configured to adjust the output power of the fuel cell to a third power value when the state of charge value of the high-voltage battery reaches the target value if the operating power of the electrical device is reduced to the third power value, where the third power value is smaller than the second power value;
the fifth control module is used for controlling the fuel cell to stop running and driving the electric equipment by the high-voltage battery if the state of charge value of the high-voltage battery reaches an upper limit value, wherein the upper limit value is the maximum value in the preset range;
and the sixth control module is used for controlling the fuel cell to recover the operation when the fuel cell stops operating and the state of charge value of the high-voltage battery is lower than a lower limit value, and controlling the fuel cell to increase the output power so as to drive the electric equipment and charge the high-voltage battery, wherein the lower limit value is the minimum value in the preset range.
5. A vehicle characterized by comprising the battery control system according to claim 4.
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