CN114750638A - Power battery current control method and device, electric vehicle and storage medium - Google Patents
Power battery current control method and device, electric vehicle and storage medium Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
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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
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- B60L2240/10—Vehicle control parameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60L2240/00—Control parameters of input or output; Target parameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
The invention discloses a power battery current control method and device, an electric automobile and a storage medium. According to the technical scheme of the embodiment of the invention, the current motor torque, the current motor rotating speed, the current bus voltage and the power distribution unit parameters of the electric vehicle are obtained by judging the running state of the electric vehicle with the power battery, the current motor driving bus current value is determined by inquiring the motor driving data comparison table when the running state of the electric vehicle with the power battery reaches a relatively ideal working state, the current value of the current motor driving bus is determined by combining the power distribution unit parameters, the current correction parameter of the battery management system is calculated, and the errors which possibly occur due to temperature drift, null drift, overload and magnetic saturation during current detection of the battery management system are made up, so that the battery management system BMS can obtain the accurate power battery pack current value, the reliability of the battery management system BMS is ensured, meanwhile, the maintenance cost of each part of the electric vehicle is low, and the maintenance efficiency is improved.
Description
Technical Field
The invention relates to the technical field of power battery control, in particular to a power battery current control method and device, an electric automobile and a storage medium.
Background
In recent years, efficient zero-emission electric automobiles are developed in a large scale due to the fact that the problems of climate change, environmental pollution and energy crisis are increasingly prominent. The power battery has become the first choice solution for the electric vehicle, but the problems of safety, cost, cycle performance and the like always restrict the market competitiveness of the electric vehicle, wherein the influence of the battery pack current on the performance and stability of the power battery is particularly emphasized by people.
The Battery Management System (BMS) has a plurality of main functions of collecting voltage, current, and temperature data of a power Battery, accurately estimating a remaining capacity (SOC) of the power Battery, preventing overcharge and overdischarge, and performing balance Management, and in an electric vehicle with a power Battery, it is required to ensure that the BMS can realize the main functions to maintain the stability of the Battery. At present, current values need to be detected in multiple links of power battery management, a mainstream current collection mode has two modes of a hall sensor and a shunt based on hall effect design, however, with the use of an electric automobile, the current detection modes inevitably generate the problems of temperature drift, null drift, overload, magnetic flux saturation and the like according to different types, so that the battery management system BMS is difficult to acquire an accurate power battery pack current value, and thus the battery management system BMS can accurately estimate the residual capacity (SOC) of a battery, and the original functions are difficult to realize in the aspects of overcharge, overdischarge, balance management and the like. In order to guarantee the functional reliability of the battery management system BMS, the accuracy of the current of the battery pack collected by the battery management system BMS needs to be effectively guaranteed.
Disclosure of Invention
The invention provides a power battery current control method and device, an electric vehicle and a storage medium, and aims to solve the problem that the accuracy of battery pack current collected by a Battery Management System (BMS) cannot be ensured in the prior art.
According to an aspect of the present invention, there is provided a power battery current control method including:
acquiring a vehicle running state, a battery management system state, a power distribution unit state, a current motor torque, a current motor rotating speed and a current bus voltage of the electric vehicle through the vehicle controller;
when the vehicle running state is in a cruise mode, energy recovery is not started, the battery management system state is a non-fault state, and the power distribution unit state is a non-fault state, determining a current motor driving bus current value according to the current motor torque, the current motor rotating speed and the current bus voltage of the electric vehicle;
obtaining parameters of a power distribution unit through the vehicle control unit, obtaining current values of a current power distribution unit loop of the power distribution unit, and determining current correction parameters of the battery management system according to current values of a current motor drive bus and the current values of the current power distribution unit loop;
And the battery management system determines the current value of the current battery pack of the power battery based on the current correction parameter.
Optionally, determining a current value of a driving bus of the motor according to the current motor torque, the current motor speed, and the current bus voltage of the electric vehicle includes:
obtaining theoretical motor rotating speed, theoretical motor torque, theoretical bus voltage and theoretical bus current value of each group of motors of a motor direct drive part of the electric automobile, and generating a motor driving data comparison table of the theoretical motor rotating speed, the theoretical motor torque, the theoretical bus voltage and the theoretical bus current value so as to write the motor driving data comparison table into the whole automobile controller;
and determining the current value of the current motor driving bus according to the called motor driving data comparison table stored in the vehicle controller, the current motor torque of the electric vehicle, the current motor rotating speed and the current bus voltage.
Optionally, determining a current correction parameter of the battery management system according to the current value of the current motor driving bus and the current value of the current loop of the power distribution unit, including:
determining a theoretical battery pack current value of the power battery according to a current motor drive bus current value and the current power distribution unit loop current value;
And acquiring an initial battery pack current value of the power battery through the battery management system, and determining a current correction parameter of the battery management system according to the theoretical battery pack current value and the initial battery pack current value.
Optionally, the current correction parameter includes a current correction coefficient and a current correction compensation amount;
determining a current correction parameter of the battery management system according to the theoretical battery pack current value and the initial battery pack current value, wherein the current correction parameter comprises the following steps:
and after the theoretical battery pack current value and the initial battery pack current value are controlled to be consistent in a preset time period by a PID (proportion integration differentiation) adjusting system, calculating a current correction coefficient and a current correction compensation quantity of a battery management system so as to write the current correction coefficient and the current correction compensation quantity into the battery management system.
Optionally, the determining, by the battery management system, the current battery pack current value of the power battery based on the current correction parameter includes:
and the battery management system determines the current value of the current battery pack of the power battery based on the current value of the current battery pack, the current correction coefficient and the current correction compensation quantity.
Optionally, after determining the current correction parameter of the battery management system according to the theoretical battery pack current value and the initial battery pack current value, the method further includes:
If the current correction coefficient is larger than a first limited correction threshold value, feeding back that the current value of the battery pack detected by the battery management system has positive deviation;
if the current correction coefficient is smaller than or equal to the first limited correction threshold, judging whether the current correction coefficient is smaller than a second limited correction threshold, and determining whether the current value of the battery pack detected by the battery management system has deviation according to the judged result whether the current correction coefficient is smaller than the second limited correction threshold.
Optionally, determining whether the current correction coefficient is smaller than a second limited correction threshold, and determining whether a current value of the battery pack detected by the battery management system has a deviation according to a result of determining whether the current correction coefficient is smaller than the second limited correction threshold, includes:
if the current correction coefficient is smaller than a second limited correction threshold value, feeding back that a negative deviation exists in the current value of the battery pack detected by the battery management system;
and if the current correction coefficient is larger than or equal to a second limited correction threshold value, feeding back that the current value of the battery pack detected by the battery management system is normal.
According to another aspect of the present invention, there is provided a power battery current control apparatus including:
The information acquisition module is used for acquiring the vehicle running state, the battery management system state, the power distribution unit state, the current motor torque, the current motor rotating speed and the current bus voltage of the electric vehicle through the vehicle controller;
the current motor driving bus current value determining module is used for determining a current motor driving bus current value according to the current motor torque, the current motor rotating speed and the current bus voltage of the electric automobile when the vehicle running state is in a cruise mode and energy recovery is not started, the battery management system state is a non-fault state, and the power distribution unit state is a non-fault state;
the current correction parameter determining module is used for obtaining the parameters of the power distribution unit through the vehicle control unit, obtaining the current value of the current power distribution unit loop of the power distribution unit, and determining the current correction parameters of the battery management system according to the current value of the current motor driving bus and the current value of the current power distribution unit loop;
and the current battery pack current value determining module is used for executing the current battery pack current value determining of the power battery by the battery management system based on the current correction parameter.
According to another aspect of the present invention, there is provided an electric vehicle including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein, the first and the second end of the pipe are connected with each other,
the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the power battery current control method according to any embodiment of the invention.
According to another aspect of the present invention, there is provided a computer readable storage medium storing computer instructions for causing a processor to implement the power battery current control method according to any one of the embodiments of the present invention when executed.
According to the technical scheme of the embodiment of the invention, the current motor torque, the current motor rotating speed, the current bus voltage and the power distribution unit parameters of the electric vehicle are obtained by judging the running state of the electric vehicle with the power battery, the current motor driving bus current value is determined by inquiring the motor driving data comparison table when the running state of the electric vehicle with the power battery reaches a relatively ideal working state, the current value of the current motor driving bus is determined by combining the power distribution unit parameters, the current correction parameter of the battery management system is calculated, errors which may occur due to temperature drift, zero drift, overload and magnetic saturation when the current of the battery management system is detected are made up, so that the battery management system BMS can obtain the accurate current value of the power battery pack, the reliability of the battery management system BMS is ensured, meanwhile, the maintenance cost of each part of the electric vehicle is low, and the maintenance efficiency is improved.
It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for controlling a power battery current according to an embodiment of the present invention;
FIG. 2 is an electrical architecture diagram of a high voltage loop of a power cell electric vehicle to which embodiments of the present invention are applicable;
FIG. 3 is a flowchart of a power battery current control method according to a second embodiment of the present invention;
FIG. 4 is a flowchart of a power battery current control method according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of a power battery current control device according to a fourth embodiment of the present invention;
Fig. 6 is a schematic structural diagram of an electric vehicle implementing the power battery current control method of the embodiment of the invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "initial", "theoretical" and the like in the description and claims of the present invention and the above-described drawings are used for distinguishing similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Fig. 1 is a flowchart of a power battery current control method according to an embodiment of the present invention, and fig. 2 is an electrical architecture diagram of a high-voltage loop of a power battery electric vehicle to which the embodiment of the present invention is applied. As shown in fig. 1, the power battery current control method includes:
s110, acquiring a vehicle running state, a battery management system state, a power distribution unit state, a current motor torque, a current motor rotating speed and a current bus voltage of the electric vehicle through the vehicle controller.
When the electric automobile runs, the vehicle control unit can judge the current state of the electric automobile according to a driver instruction, the vehicle working condition and the like, and the vehicle running state of the electric automobile is obtained.
The vehicle running state can comprise a vehicle running mode and an energy state, optionally, the vehicle running mode can be a cruise mode, when the electric vehicle is in the cruise mode, the vehicle running speed is stable, and the motor is in a constant rotating speed mode, so that the current correction of the current value of the battery pack of the direct-drive electric vehicle power battery is favorably realized.
The battery management system BMS is used for managing the power battery unit to prevent overcharge and overdischarge, prolongs the service life of the power battery, can monitor the real-time state of the power battery, and collects and processes various power battery signals. In this embodiment, the state of the battery management system is to determine whether the battery management system has a fault, i.e., whether the state of the battery management system is a no-fault state.
Referring to fig. 2, in the high-voltage loop of the power battery electric vehicle, the power battery pack power supply loop is roughly divided into two parts: the direct-drive electric vehicle power battery pack current value is equal to the sum of the motor drive bus current value and the power distribution unit loop current value.
The Power Distribution Unit (PDU) provides charge and discharge control, high-voltage component Power-on control, current overload short-circuit protection, high-voltage sampling, low-voltage control, auxiliary machine monitoring, monitoring high-voltage system operation and the like for a high-voltage system of the electric automobile, and the PDU also integrates a motor Distribution line on part of non-direct-drive motor electric automobiles. In this embodiment, the status of the power distribution unit is to determine whether the power distribution unit has a fault, i.e. whether the status of the power distribution unit is a no-fault status.
In this embodiment, after the vehicle driving state, the battery management system state, and the power distribution unit state of the electric vehicle are obtained by the vehicle control unit, the current motor torque, the current motor speed, and the current bus voltage of the electric vehicle are obtained by the vehicle control unit under the preset condition.
And S120, when the vehicle is in a cruise mode in a running state, energy recovery is not started, the battery management system is in a non-fault state, and the power distribution unit is in a non-fault state, determining the current value of the current motor driving bus according to the current motor torque, the current motor rotating speed and the current bus voltage of the electric vehicle.
It should be explained that whether the vehicle driving state is in the cruise mode and the energy recovery is not started, whether the state of the battery management system is in the no-fault state, and whether the state of the power distribution unit is in the no-fault state are set, and the preset conditions are set to enable the battery pack current value of the direct-drive electric vehicle power battery to be corrected and used in the high-voltage loop and the optimal working condition of each component, so that a better battery pack current value correction effect is achieved.
When the state of the battery management system is a fault state, the battery pack of the power battery is in an abnormal working state, and the meaning of correcting the current of the battery pack is not very great.
When the state of the power distribution unit is a fault state, it indicates that the high-voltage loop system is faulty, or the auxiliary machine is in an abnormal working state, and at this time, the high-voltage loop is in an abnormal state, so that the current of the battery pack is not suitable to be corrected.
The energy recovery means that under certain working conditions, the motor is in a power generation state, power generation is used for charging a battery pack of the power battery, and when the energy recovery is started, the battery pack of the power battery is in a charging state and is not suitable for a battery pack current value correction method.
Specifically, when the vehicle is in a cruise mode in a running state, the energy recovery is not started, the battery management system is in a non-fault state, and the power distribution unit is in a non-fault state, the battery management system is in a relatively ideal working condition, and the current consumed by the motor and the power distribution unit has a relatively stable ideal value, so that the current value of the battery pack of the direct-drive electric vehicle power battery can be corrected conveniently.
In this embodiment, theoretical motor rotation speeds, theoretical motor torques, theoretical bus voltages and theoretical bus current values of each group of motors of a motor direct-drive part of the electric vehicle are obtained, and a motor drive data comparison table of the theoretical motor rotation speeds, the theoretical motor torques, the theoretical bus voltages and the theoretical bus current values is generated, so that the motor drive data comparison table is written into the vehicle control unit; and determining the current motor driving bus current value according to the called motor driving data comparison table stored in the vehicle control unit, the current motor torque of the electric vehicle, the current motor rotating speed and the current bus voltage.
S130, obtaining power distribution unit parameters through the vehicle control unit, obtaining current values of current power distribution unit loops of the power distribution units, and determining current correction parameters of the battery management system according to current values of motor driving buses and the current values of the current power distribution unit loops.
In the electric automobile, under the working condition that the conditions are met, the current value of the battery pack of the direct-drive type electric automobile power battery is only used for direct drive of the motor and use of the power distribution unit.
Specifically, a theoretical battery pack current value of the power battery is determined according to a current motor drive bus current value and a current power distribution unit loop current value; and acquiring an initial battery pack current value of the power battery through the battery management system, and determining a current correction parameter of the battery management system according to the theoretical battery pack current value and the initial battery pack current value.
And S140, the battery management system determines the current value of the current battery pack of the power battery based on the current correction parameter.
On the basis, the battery management system determines the current battery pack current value of the power battery based on the initial battery pack current value, the current correction coefficient and the current correction compensation amount.
According to the technical scheme of the embodiment of the invention, the current motor torque, the current motor rotating speed, the current bus voltage and the power distribution unit parameters of the electric vehicle are obtained by judging the running state of the electric vehicle with the power battery, the current motor driving bus current value is determined by inquiring the motor driving data comparison table when the running state of the electric vehicle with the power battery reaches a relatively ideal working state, the current value of the current motor driving bus is determined by combining the power distribution unit parameters, the current correction parameter of the battery management system is calculated, errors which may occur due to temperature drift, zero drift, overload and magnetic saturation when the current of the battery management system is detected are made up, so that the battery management system BMS can obtain the accurate current value of the power battery pack, the reliability of the battery management system BMS is ensured, meanwhile, the maintenance cost of each part of the electric vehicle is low, and the maintenance efficiency is improved.
Example two
Fig. 3 is a flowchart of a power battery current control method according to a second embodiment of the present invention, and further describes the determination and correction of a battery pack current value of a power battery of a direct drive electric vehicle based on the second embodiment. As shown in fig. 3, the power battery current control method includes:
S310, acquiring a vehicle running state, a battery management system state, a power distribution unit state, a current motor torque, a current motor rotating speed and a current bus voltage of the electric vehicle through the vehicle controller.
And S320, judging whether the state of the battery management system is a no-fault state, if so, executing a step S330, and if not, finishing the correction of the current value of the battery pack of the power battery of the direct-drive electric automobile.
And S330, judging whether the vehicle running state is in a cruise mode or not and not starting energy recovery, if so, executing a step S340, and if not, finishing the correction of the battery pack current value of the direct-drive electric vehicle power battery.
And S340, judging whether the state of the power distribution unit is a no-fault state, if so, executing the step S350, and if not, finishing the correction of the current value of the battery pack of the power battery of the direct-drive electric vehicle.
And S350, determining the current value of the current motor driving bus according to the current motor torque, the current motor rotating speed and the current bus voltage of the electric automobile.
Specifically, for a motor direct-drive part of an electric vehicle, when the motor leaves a factory, under relatively ideal test conditions, theoretical motor rotation speeds, theoretical motor torques, theoretical bus voltages and theoretical bus current values of each group of motors of the motor direct-drive part of the electric vehicle can be obtained, and a motor drive data comparison table of the theoretical motor rotation speeds, the theoretical motor torques, the theoretical bus voltages and the theoretical bus current values is generated, so that the motor drive data comparison table is written into the vehicle controller; and searching the current motor torque, the current motor rotating speed and the current motor driving bus current value corresponding to the current bus voltage of the electric automobile from a motor driving data comparison table according to the called motor driving data comparison table stored in the vehicle control unit.
S360, obtaining parameters of a power distribution unit through the vehicle control unit, obtaining a current value of a current power distribution unit loop of the power distribution unit, and determining a theoretical battery pack current value of the power battery according to a current motor driving bus current value and the current value of the current power distribution unit loop.
Specifically, the power distribution unit has a function of monitoring the current consumed by the auxiliary machine, and then the current value of the loop of the power distribution unit is obtained according to the parameters of the power distribution unit.
And S370, acquiring an initial battery pack current value of the power battery through the battery management system, and determining a current correction parameter of the battery management system according to the theoretical battery pack current value and the initial battery pack current value, wherein the current correction parameter comprises a current correction coefficient and a current correction compensation quantity.
Specifically, a theoretical battery pack current value is transmitted to a battery management system through a bus, after the theoretical battery pack current value is controlled to be consistent with the initial battery pack current value within a preset time period through a PID (proportion integration differentiation) adjusting system, a current correction coefficient and a current correction compensation quantity of the battery management system are calculated, and the current correction coefficient and the current correction compensation quantity are written into the battery management system.
And S380, the battery management system determines the current battery pack current value of the power battery based on the current battery pack current value, the current correction coefficient and the current correction compensation amount.
EXAMPLE III
Fig. 4 is a flowchart of a power battery current control method according to a third embodiment of the present invention, and is based on the third embodiment, a battery pack current value of a direct drive electric vehicle power battery. As shown in fig. 4, the power battery current control method includes:
and S410, acquiring a vehicle running state, a battery management system state, a power distribution unit state, a current motor torque, a current motor rotating speed and a current bus voltage of the electric vehicle through the vehicle controller.
And S411, judging whether the state of the battery management system is a no-fault state, if so, executing a step S412, and if not, finishing the correction of the current value of the battery pack of the direct-drive electric vehicle power battery.
And S412, judging whether the vehicle running state is in a cruise mode or not and not starting energy recovery, if so, executing a step S413, and if not, finishing the correction of the battery pack current value of the direct-drive electric vehicle power battery.
And S413, judging whether the state of the power distribution unit is a non-fault state, if so, executing a step S414, and if not, finishing the correction of the current value of the battery pack of the direct-drive electric vehicle power battery.
And S414, determining the current value of the driving bus of the current motor according to the current motor torque, the current motor rotating speed and the current bus voltage of the electric automobile.
And S415, obtaining parameters of a power distribution unit through the vehicle control unit, obtaining a current value of a current power distribution unit loop of the power distribution unit, and determining a theoretical battery pack current value of the power battery according to a current value of a motor driving bus and the current value of the current power distribution unit loop.
And S416, acquiring an initial battery pack current value of the power battery through the battery management system, and determining a current correction parameter of the battery management system according to the theoretical battery pack current value and the initial battery pack current value, wherein the current correction parameter comprises a current correction coefficient and a current correction compensation quantity.
And S417, judging whether the current correction coefficient is larger than a first limited correction threshold value, if so, feeding back that the current value of the battery pack detected by the battery management system has positive deviation, and if not, executing a step S418.
And if the current correction coefficient is larger than a first limited correction threshold value, feeding back that the current value of the battery pack detected by the battery management system has positive deviation, wherein the positive deviation is overlarge.
And S418, judging whether the current correction coefficient is smaller than a second limited correction threshold value, if so, feeding back a negative deviation of the current value of the battery pack detected by the battery management system, and if not, executing a step S419.
And if the current correction coefficient is smaller than a second limited correction threshold value, feeding back that a negative deviation exists in the current value of the battery pack detected by the battery management system, wherein the negative deviation is overlarge.
It can be understood that when the positive deviation or the negative deviation of the current value of the battery pack detected by the battery management system is too large and maintenance is needed, the maintenance can be purposefully performed according to the current detection data of the battery pack of the power battery pack recorded by the battery management system BMS, so that the maintenance efficiency is improved.
And S419, feeding back that the current value of the battery pack detected by the battery management system is normal.
And S420, the battery management system determines the current battery pack current value of the power battery based on the current correction parameter.
Example four
Fig. 5 is a schematic structural diagram of a power battery current control device according to a fourth embodiment of the present invention. As shown in fig. 5, the power battery current control device includes:
the information acquisition module 510 is configured to perform acquiring, by the vehicle controller, a vehicle driving state, a battery management system state, a power distribution unit state, a current motor torque, a current motor speed, and a current bus voltage of the electric vehicle;
A current motor driving bus current value determining module 520, configured to determine a current motor driving bus current value according to a current motor torque of the electric vehicle, the current motor speed, and the current bus voltage when the vehicle is in a cruise mode in a driving state and energy recovery is not started, the battery management system is in a non-fault state, and the power distribution unit is in a non-fault state;
a current correction parameter determining module 530, configured to perform obtaining of parameters of a power distribution unit through the vehicle controller, obtaining a current value of a current power distribution unit loop of the power distribution unit, and determining a current correction parameter of the battery management system according to a current value of a current motor driving bus and the current value of the current power distribution unit loop;
and a current pack current value determining module 540, configured to implement that the battery management system determines a current pack current value of the power battery based on the current correction parameter.
Optionally, determining a current value of a driving bus of the motor according to the current motor torque, the current motor speed, and the current bus voltage of the electric vehicle includes:
Obtaining theoretical motor rotating speed, theoretical motor torque, theoretical bus voltage and theoretical bus current value of each group of motors of a motor direct-drive part of the electric automobile, and generating a motor drive data comparison table of the theoretical motor rotating speed, the theoretical motor torque, the theoretical bus voltage and the theoretical bus current value so as to write the motor drive data comparison table into the whole automobile controller;
and determining the current value of the current motor driving bus according to the called motor driving data comparison table stored in the vehicle controller, the current motor torque of the electric vehicle, the current motor rotating speed and the current bus voltage.
Optionally, determining a current correction parameter of the battery management system according to the current value of the current motor driving bus and the current value of the current loop of the power distribution unit, including:
determining a theoretical battery pack current value of the power battery according to a current motor drive bus current value and the current power distribution unit loop current value;
and acquiring an initial battery pack current value of the power battery through the battery management system, and determining a current correction parameter of the battery management system according to the theoretical battery pack current value and the initial battery pack current value.
Optionally, the current correction parameter includes a current correction coefficient and a current correction compensation amount;
determining a current correction parameter of the battery management system according to the theoretical battery pack current value and the initial battery pack current value, wherein the current correction parameter comprises the following steps:
and after the theoretical battery pack current value and the initial battery pack current value are controlled to be consistent in a preset time period by a PID (proportion integration differentiation) adjusting system, calculating a current correction coefficient and a current correction compensation quantity of a battery management system so as to write the current correction coefficient and the current correction compensation quantity into the battery management system.
Optionally, the determining, by the battery management system, the current battery pack current value of the power battery based on the current correction parameter includes:
and the battery management system determines the current value of the current battery pack of the power battery based on the current value of the current battery pack, the current correction coefficient and the current correction compensation quantity.
Optionally, the power battery current control device further includes:
if the current correction coefficient is larger than a first limited correction threshold value, feeding back that the current value of the battery pack detected by the battery management system has positive deviation;
if the current correction coefficient is smaller than or equal to the first limited correction threshold, judging whether the current correction coefficient is smaller than a second limited correction threshold, and determining whether the current value of the battery pack detected by the battery management system has deviation according to the judged result whether the current correction coefficient is smaller than the second limited correction threshold.
Optionally, determining whether the current correction coefficient is smaller than a second limited correction threshold, and determining whether a current value of the battery pack detected by the battery management system has a deviation according to a result of determining whether the current correction coefficient is smaller than the second limited correction threshold, includes:
if the current correction coefficient is smaller than a second limited correction threshold value, feeding back that a negative deviation exists in the current value of the battery pack detected by the battery management system;
and if the current correction coefficient is larger than or equal to a second limited correction threshold value, feeding back that the current value of the battery pack detected by the battery management system is normal.
The power battery current control device provided by the embodiment of the invention can execute the power battery current control method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the power battery current control method.
EXAMPLE five
FIG. 6 illustrates a schematic diagram of an electric vehicle 10 that may be used to implement an embodiment of the present invention. As shown in fig. 6, the electric vehicle 10 or the vehicle control unit of the electric vehicle includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as a Read Only Memory (ROM)12, a Random Access Memory (RAM)13, and the like, where the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various suitable actions and processes according to the computer program stored in the Read Only Memory (ROM)12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electric vehicle 10 or a vehicle control unit of the electric vehicle may also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
A plurality of components in the electric vehicle 10 or a vehicle controller of the electric vehicle are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, or the like; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electric vehicle 10 or the vehicle controller of the electric vehicle to exchange information/data with other devices through a computer network such as the internet and/or various telecommunication networks.
In some embodiments, the power battery current control method may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed on the electric vehicle 10 or the vehicle controller of the electric vehicle via the ROM 12 and/or the communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the power battery current control method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the power battery current control method by any other suitable means (e.g., by way of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
Computer programs for implementing the methods of the present invention can be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described herein may be implemented on a vehicle control unit of an electric vehicle or electric automobile having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user may provide input to the electric vehicle or the vehicle controller of the electric vehicle. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), Wide Area Networks (WANs), blockchain networks, and the Internet.
The computing system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service are overcome.
It should be understood that various forms of the flows shown above, reordering, adding or deleting steps, may be used. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A power battery current control method, comprising:
acquiring a vehicle running state, a battery management system state, a power distribution unit state, a current motor torque, a current motor rotating speed and a current bus voltage of the electric vehicle through the vehicle control unit;
when the vehicle running state is in a cruising mode and the energy recovery is not started, the battery management system state is a non-fault state, and the power distribution unit state is a non-fault state, determining the current motor driving bus current value according to the current motor torque, the current motor rotating speed and the current bus voltage of the electric vehicle;
Obtaining parameters of a power distribution unit through the vehicle control unit, obtaining current values of a current power distribution unit loop of the power distribution unit, and determining current correction parameters of the battery management system according to current values of a current motor drive bus and the current values of the current power distribution unit loop;
and the battery management system determines the current value of the current battery pack of the power battery based on the current correction parameter.
2. The power battery current control method according to claim 1, wherein determining a current motor drive bus current value from a current motor torque, the current motor speed, and the current bus voltage of the electric vehicle includes:
obtaining theoretical motor rotating speed, theoretical motor torque, theoretical bus voltage and theoretical bus current value of each group of motors of a motor direct-drive part of the electric automobile, and generating a motor drive data comparison table of the theoretical motor rotating speed, the theoretical motor torque, the theoretical bus voltage and the theoretical bus current value so as to write the motor drive data comparison table into the whole automobile controller;
and determining the current motor driving bus current value according to the called motor driving data comparison table stored in the vehicle control unit, the current motor torque of the electric vehicle, the current motor rotating speed and the current bus voltage.
3. The power battery current control method of claim 1, wherein determining current correction parameters for a battery management system based on a current motor drive bus current value and the current power distribution unit loop current value comprises:
determining a theoretical battery pack current value of the power battery according to a current motor drive bus current value and the current power distribution unit loop current value;
and acquiring an initial battery pack current value of the power battery through the battery management system, and determining a current correction parameter of the battery management system according to the theoretical battery pack current value and the initial battery pack current value.
4. The power battery current control method according to claim 3, characterized in that the current correction parameter includes a current correction coefficient and a current correction compensation amount;
determining a current correction parameter of the battery management system according to the theoretical battery pack current value and the initial battery pack current value, wherein the current correction parameter comprises the following steps:
and after the theoretical battery pack current value and the initial battery pack current value are controlled to be consistent in a preset time period by a PID (proportion integration differentiation) adjusting system, calculating a current correction coefficient and a current correction compensation quantity of a battery management system so as to write the current correction coefficient and the current correction compensation quantity into the battery management system.
5. The power battery current control method according to claim 4, wherein the battery management system determines a current pack current value of the power battery based on the current correction parameter, including:
and the battery management system determines the current value of the current battery pack of the power battery based on the current value of the current battery pack, the current correction coefficient and the current correction compensation quantity.
6. The power battery current control method according to claim 4, further comprising, after determining a current correction parameter for a battery management system based on the theoretical battery pack current value and the initial battery pack current value:
if the current correction coefficient is larger than a first limited correction threshold value, feeding back that the current value of the battery pack detected by the battery management system has positive deviation;
if the current correction coefficient is smaller than or equal to the first limited correction threshold, judging whether the current correction coefficient is smaller than a second limited correction threshold, and determining whether the current value of the battery pack detected by the battery management system has deviation according to the judged result whether the current correction coefficient is smaller than the second limited correction threshold.
7. The power battery current control method according to claim 6, wherein determining whether the current correction coefficient is smaller than a second defined correction threshold, and determining whether there is a deviation in the battery pack current value detected by the battery management system based on a result of determining whether the current correction coefficient is smaller than the second defined correction threshold, includes:
If the current correction coefficient is smaller than a second limited correction threshold value, feeding back that a negative deviation exists in the current value of the battery pack detected by the battery management system;
and if the current correction coefficient is larger than or equal to a second limited correction threshold value, feeding back that the current value of the battery pack detected by the battery management system is normal.
8. A power battery current control apparatus, comprising:
the information acquisition module is used for acquiring the vehicle running state, the battery management system state, the power distribution unit state, the current motor torque, the current motor rotating speed and the current bus voltage of the electric vehicle through the vehicle control unit;
the current motor driving bus current value determining module is used for determining a current motor driving bus current value according to the current motor torque, the current motor rotating speed and the current bus voltage of the electric automobile when the vehicle running state is in a cruise mode and energy recovery is not started, the battery management system state is a no-fault state, and the power distribution unit state is a no-fault state;
the current correction parameter determining module is used for obtaining parameters of the power distribution unit through the vehicle control unit, obtaining the current value of the current power distribution unit loop of the power distribution unit, and determining the current correction parameters of the battery management system according to the current value of the current motor drive bus and the current value of the current power distribution unit loop;
And the current battery pack current value determining module is used for executing the current battery pack current value determining of the power battery by the battery management system based on the current correction parameter.
9. An electric vehicle, characterized in that the electric vehicle comprises:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the power battery current control method of any one of claims 1-7.
10. A computer-readable storage medium storing computer instructions for causing a processor to perform the power battery current control method of any one of claims 1-7 when executed.
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