CN114750638B - Power battery current control method and device, electric automobile and storage medium - Google Patents
Power battery current control method and device, electric automobile 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
- B60L2240/10—Vehicle control 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/10—Vehicle control parameters
- B60L2240/12—Speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/421—Speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/423—Torque
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/427—Voltage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/429—Current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/549—Current
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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, the running state of the power battery electric automobile is judged, when the running state of the power battery electric automobile reaches a relatively ideal working state, the current motor torque, the current motor rotating speed, the current bus voltage and the power distribution unit parameters of the electric automobile are obtained, the current motor driving bus current value is determined by inquiring the motor driving data comparison table, the current power distribution unit loop current value is determined by combining the power distribution unit parameters, the current correction parameters of the battery management system are calculated, errors possibly caused by temperature drift, zero 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 accurate power battery pack current values, the reliability of the battery management system BMS is guaranteed, meanwhile, the maintenance cost of each part of the electric automobile is low, and the maintenance efficiency is improved.
Description
Technical Field
The present invention relates to the field of power battery control technologies, and in particular, to a power battery current control method and apparatus, an electric vehicle, and a storage medium.
Background
In recent years, due to increasingly prominent problems of climate change, environmental pollution and energy crisis, high-efficiency zero-emission electric automobiles are developed in large scale. The power battery has become the preferred solution of the electric automobile, but the problems of safety, cost, cycle performance and the like of the power battery always restrict the market competitiveness of the electric automobile, wherein the influence of battery pack current on the performance and stability of the power battery is particularly valued by people.
The Battery management system (Battery MANAGEMENT SYSTEM, BMS) has the main functions of collecting voltage, current and temperature data of the power Battery, accurately estimating the residual capacity (SOC) of the power Battery, preventing overcharge and overdischarge, and performing balance management, and in an electric vehicle of the power Battery, it is necessary to ensure that the Battery management system BMS can realize the main functions so as to maintain the stability of the Battery. At present, current values need to be detected in a plurality of links of power battery management, and a main current collection mode is provided with a Hall sensor and a shunt which are designed based on a Hall effect, however, as an electric automobile is used, the current detection modes inevitably generate problems of temperature drift, zero drift, overload, magnetic flux saturation and the like according to different types, so that a battery management system BMS is difficult to obtain an accurate power battery pack current value, and the battery management system BMS can accurately estimate the residual electric quantity (SOC) of a battery, and is difficult to realize original functions in the aspects of overcharge, overdischarge, balanced management and the like. In order to ensure the functional reliability of the battery management system BMS, the accuracy of the battery pack current collected by the battery management system BMS needs to be effectively ensured.
Disclosure of Invention
The invention provides a power battery current control method and device, an electric automobile and a storage medium, and aims to solve the problem that the accuracy of battery pack current acquired by a Battery Management System (BMS) cannot be guaranteed 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 a whole vehicle controller;
when the vehicle running state is in a cruising mode and energy recovery is not started, the battery management system state is in a fault-free state, and the power distribution unit state is in a fault-free 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 whole vehicle controller, obtaining a current power distribution unit loop current value of the power distribution unit, and determining current correction parameters of a battery management system according to the current motor driving bus current value and the current power distribution unit loop current value;
The battery management system determines a current battery pack current value for the power battery based on the current modification parameter.
Optionally, determining the current motor driving bus current value according to the current motor torque, the current motor rotation speed and the current bus voltage of the electric automobile includes:
Acquiring a theoretical motor rotating speed, a theoretical motor torque, a theoretical bus voltage and a 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 a current motor driving bus current value according to the retrieved motor driving data comparison table stored in the whole vehicle controller, the current motor torque of the electric vehicle, the current motor rotating speed and the current bus voltage.
Optionally, determining the current correction parameter of the battery management system according to the current motor driving bus current value and the current power distribution unit loop current value includes:
Determining a theoretical battery pack current value of the power battery according to a current motor driving 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 parameters include a current correction coefficient and a current correction compensation amount;
determining a current correction parameter of a battery management system according to the theoretical battery pack current value and the initial battery pack current value, including:
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 through a PID (proportion integration differentiation) regulating system, calculating a current correction coefficient and a current correction compensation quantity of a battery management system, and writing the current correction coefficient and the current correction compensation quantity into the battery management system.
Optionally, the battery management system determines a current battery pack current value of the power battery based on the current correction parameter, including:
the battery management system determines a current pack current value of the power battery based on the current pack current value, the current correction coefficient, and the current correction compensation amount.
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 limiting correction threshold value, feeding back that a positive deviation exists in the battery pack current value detected by the battery management system;
And if the current correction coefficient is smaller than or equal to the first limiting correction threshold, judging whether the current correction coefficient is smaller than a second limiting correction threshold, and determining whether deviation exists in the battery pack current value detected by the battery management system according to the judging result of whether the current correction coefficient is smaller than the second limiting correction threshold.
Optionally, determining whether the current correction coefficient is smaller than a second limiting correction threshold, and determining whether a deviation exists in the battery pack current value detected by the battery management system according to a result of determining whether the current correction coefficient is smaller than the second limiting correction threshold, including:
If the current correction coefficient is smaller than a second limiting correction threshold value, feeding back that negative deviation exists in the battery pack current value detected by the battery management system;
And if the current correction coefficient is larger than or equal to a second limiting correction threshold value, feeding back that the battery pack current value 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 whole 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 cruising mode and energy recovery is not started, the battery management system state is in a fault-free state and the power distribution unit state is in a fault-free state;
The current correction parameter determining module is used for obtaining the parameters of the power distribution unit through the whole vehicle controller, obtaining the current value of the current power distribution unit loop of the power distribution unit, and determining the 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 power distribution unit loop;
And the current battery pack current value determining module is used for executing the battery management system to determine the current battery pack current value of the power battery 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 memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the power cell current control method of any one of the embodiments of the present 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 execute the power battery current control method according to any one of the embodiments of the present invention.
According to the technical scheme, the running state of the power battery electric automobile is judged, when the running state of the power battery electric automobile reaches a relatively ideal working state, the current motor torque, the current motor rotating speed, the current bus voltage and the power distribution unit parameters of the electric automobile are obtained, the current motor driving bus current value is determined by inquiring the motor driving data comparison table, the current power distribution unit loop current value is determined by combining the power distribution unit parameters, the current correction parameters of the battery management system are calculated, errors possibly caused by temperature drift, zero 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 accurate power battery pack current values, the reliability of the battery management system BMS is guaranteed, meanwhile, the maintenance cost of each part of the electric automobile is low, and the maintenance efficiency is improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a power battery current control method according to a first embodiment of the present invention;
FIG. 2 is an electrical architecture diagram of a power cell electric vehicle high voltage circuit adapted according to an embodiment of the present invention;
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 view of an electric vehicle implementing a power battery current control method of an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the 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 in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, 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 1
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 structure diagram of a high-voltage loop of an electric vehicle of a power battery, where the embodiment of the present invention is applicable to a case of performing current correction on a battery pack current value of a power battery of a direct-drive electric vehicle, where the power battery current control method may be performed by a power battery current control device, and the power battery current control device may be implemented in a hardware and/or software form, and the power battery current control device may be configured in an electric vehicle or a vehicle controller of the electric vehicle. 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 whole vehicle controller.
When the electric automobile runs, the whole vehicle controller can judge the current state of the electric automobile according to the driver instruction, the vehicle working condition and the like, and the running state of the electric automobile is obtained.
The vehicle running state can comprise a vehicle running mode and an energy state, and optionally, the vehicle running mode can be a cruising mode, when the electric automobile is in the cruising mode, the vehicle running speed is stable, and the motor is in a constant rotating speed mode, so that the current correction of the battery pack current value of the power battery of the direct-drive electric automobile is facilitated.
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, and can monitor the real-time state of the power battery and collect and process 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 fault-free state.
Referring to fig. 2, in a high-voltage loop of a power battery electric vehicle, a power battery pack power supply loop is generally divided into two parts: the battery pack current value of the direct-drive electric vehicle power battery is equal to the sum of the motor drive bus current value and the power supply distribution unit loop current value.
The power distribution unit (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 the electric automobile high-voltage system, and the power distribution unit PDU also integrates a motor distribution circuit 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 fault-free status.
In this embodiment, after the vehicle running state, the battery management system state, and the power distribution unit state of the electric vehicle are obtained through the whole vehicle controller, the current motor torque, the current motor rotation speed, and the current bus voltage of the electric vehicle are obtained through the whole vehicle controller under the preset conditions.
And S120, when the vehicle running state is in a cruising mode and energy recovery is not started, the battery management system state is in a fault-free state, and the power distribution unit state is in a fault-free 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.
It should be explained that, whether the vehicle driving state is in the cruising mode and the energy recovery is not started, whether the battery management system state is in a fault-free state, and whether the power distribution unit state is in a fault-free state, the preset conditions are set to enable the battery pack current value correction of the power battery of the direct-drive electric vehicle to be used in the optimal working conditions of the high-voltage loop and 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 current correction of the battery pack is not significant.
When the state of the power distribution unit is a fault state, the fault of the high-voltage loop system is indicated, or the auxiliary machine is in an abnormal working state, and at the moment, the high-voltage loop is in an abnormal state, so that correction of the battery pack current is not suitable.
The energy recovery means that under certain working conditions, the motor is in a power generation state, the 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 driving state is in the cruising mode and the energy recovery is not started, the battery management system is in a fault-free state, and the power distribution unit is in a fault-free 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 battery pack current value of the power battery of the direct-drive electric vehicle can be corrected conveniently.
In this embodiment, a theoretical motor rotation speed, a theoretical motor torque, a theoretical bus voltage and a theoretical bus current value 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 speed, the theoretical motor torque, the theoretical bus voltage and the theoretical bus current value is generated, so that the motor drive data comparison table is written into the whole vehicle controller; and determining a current motor driving bus current value according to the retrieved motor driving data comparison table stored in the whole vehicle controller, the current motor torque of the electric vehicle, the current motor rotating speed and the current bus voltage.
S130, obtaining parameters of a power distribution unit through the whole vehicle controller, obtaining a current power distribution unit loop current value of the power distribution unit, and determining current correction parameters of a battery management system according to the current motor driving bus current value and the current power distribution unit loop current value.
In the electric automobile, under the working condition that the conditions are met, the battery pack current value of the power battery of the direct-drive electric automobile is only used by the motor direct-drive and power distribution unit.
Specifically, determining a theoretical battery pack current value of the power battery according to a current motor driving 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.
And S140, the battery management system determines the current battery pack current value of the power battery based on the current correction parameter.
On the basis of the above, the battery management system determines the current pack current value of the power battery based on the initial pack current value, the current correction coefficient, and the current correction compensation amount.
According to the technical scheme, the running state of the power battery electric automobile is judged, when the running state of the power battery electric automobile reaches a relatively ideal working state, the current motor torque, the current motor rotating speed, the current bus voltage and the power distribution unit parameters of the electric automobile are obtained, the current motor driving bus current value is determined by inquiring the motor driving data comparison table, the current power distribution unit loop current value is determined by combining the power distribution unit parameters, the current correction parameters of the battery management system are calculated, errors possibly caused by temperature drift, zero 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 accurate power battery pack current values, the reliability of the battery management system BMS is guaranteed, meanwhile, the maintenance cost of each part of the electric automobile 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 on the basis of the above embodiment, the determination and correction of the battery pack current value of the power battery of the direct-drive electric vehicle are further described. 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 whole vehicle controller.
And S320, judging whether the state of the battery management system is a fault-free state, if so, executing step S330, and if not, ending the correction of the battery pack current value of the power battery of the direct-drive electric vehicle.
And S330, judging whether the vehicle running state is in a cruising mode and energy recovery is not started, if yes, executing step S340, and if not, ending 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 fault-free state, if so, executing the step S350, and if not, ending the correction of the battery pack current value of the power battery of the direct-drive electric vehicle.
S350, 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.
Specifically, for a motor direct-drive part of an electric automobile, when the motor leaves the factory, under relatively ideal test conditions, the theoretical motor rotating speed, the theoretical motor torque, the theoretical bus voltage and the theoretical bus current value of each group of motors of the motor direct-drive part of the electric automobile can be obtained, and 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 is generated, so that the motor driving data comparison table is written into the whole automobile 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 retrieved motor driving data comparison table stored in the whole automobile controller.
S360, obtaining parameters of a power distribution unit through the whole vehicle controller, obtaining a current power distribution unit loop current value of the power distribution unit, and determining a theoretical battery pack current value of the power battery according to the current motor driving bus current value and the current power distribution unit loop current value.
Specifically, the power distribution unit has the function of monitoring the consumption current of the auxiliary machine, and the current loop current value of the power distribution unit is obtained according to the parameters of the power distribution unit.
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, the theoretical battery pack current value is transmitted to the battery management system through a bus, 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 through a PID (proportion integration differentiation) regulating system, the current correction coefficient and the current correction compensation quantity of the battery management system are calculated, so that the current correction coefficient and the current correction compensation quantity are written into the battery management system.
S380, the battery management system determines a 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, where on the basis of the above embodiment, the battery pack current value of the power battery of the direct-drive electric vehicle is calculated. As shown in fig. 4, the power battery current control method includes:
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 whole vehicle controller.
S411, judging whether the state of the battery management system is a fault-free state, if so, executing a step S412, and if not, ending the correction of the battery pack current value of the power battery of the direct-drive electric vehicle.
And S412, judging whether the vehicle running state is in a cruising mode and energy recovery is not started, if yes, executing the step S413, and if not, ending correction of the battery pack current value of the power battery of the direct-drive electric vehicle.
S413, judging whether the state of the power distribution unit is a fault-free state, if so, executing step S414, and if not, ending the correction of the battery pack current value of the power battery of the direct-drive electric vehicle.
S414, 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.
S415, obtaining parameters of a power distribution unit through the whole vehicle controller, obtaining a current power distribution unit loop current value of the power distribution unit, and determining a theoretical battery pack current value of the power battery according to the current motor driving bus current value and the current power distribution unit loop current value.
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.
S417, judging whether the current correction coefficient is larger than a first limiting correction threshold value, if yes, feeding back that the current value of the battery pack detected by the battery management system has positive deviation, and if not, executing step S418.
If the current correction coefficient is larger than a first limiting correction threshold value, feeding back that the positive deviation exists in the battery pack current value detected by the battery management system, and the positive deviation is overlarge.
And S418, judging whether the current correction coefficient is smaller than a second limiting correction threshold value, if yes, feeding back that negative deviation exists in the battery pack current value detected by the battery management system, and if not, executing step S419.
And if the current correction coefficient is smaller than a second limiting correction threshold value, feeding back that negative deviation exists in the battery pack current value detected by the battery management system, wherein the negative deviation is overlarge.
It can be understood that when the battery pack current value detected by the battery management system is excessively large in positive deviation or excessively large in negative deviation and needs to be maintained, the maintenance can be purposefully performed according to the power battery pack current detection data recorded by the battery management system BMS, so that the maintenance efficiency is improved.
And S419, feeding back that the battery pack current value detected by the battery management system is normal.
S420, the battery management system determines the current battery pack current value of the power battery based on the current correction parameter.
Example IV
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 apparatus includes:
The information obtaining module 510 is configured to obtain, by using the vehicle controller, a vehicle running state, a battery management system state, a power distribution unit state, a current motor torque, a current motor rotation speed, and a current bus voltage of the electric vehicle;
The current motor driving bus current value determining module 520 is configured to determine a current motor driving bus current value according to a current motor torque, the current motor rotational speed, and the current bus voltage of the electric vehicle when the vehicle driving state is in a cruise mode and energy recovery is not started, the battery management system state is a fault-free state, and the power distribution unit state is a fault-free state;
the current correction parameter determining module 530 is configured to obtain a current power distribution unit loop current value of the power distribution unit by using the vehicle controller, and determine a current correction parameter of the battery management system according to the current motor driving bus current value and the current power distribution unit loop current value;
the current battery pack current value determining module 540 is configured to perform the battery management system to determine a current battery pack current value of the power battery based on the current correction parameter.
Optionally, determining the current motor driving bus current value according to the current motor torque, the current motor rotation speed and the current bus voltage of the electric automobile includes:
Acquiring a theoretical motor rotating speed, a theoretical motor torque, a theoretical bus voltage and a 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 a current motor driving bus current value according to the retrieved motor driving data comparison table stored in the whole vehicle controller, the current motor torque of the electric vehicle, the current motor rotating speed and the current bus voltage.
Optionally, determining the current correction parameter of the battery management system according to the current motor driving bus current value and the current power distribution unit loop current value includes:
Determining a theoretical battery pack current value of the power battery according to a current motor driving 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 parameters include a current correction coefficient and a current correction compensation amount;
determining a current correction parameter of a battery management system according to the theoretical battery pack current value and the initial battery pack current value, including:
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 through a PID (proportion integration differentiation) regulating system, calculating a current correction coefficient and a current correction compensation quantity of a battery management system, and writing the current correction coefficient and the current correction compensation quantity into the battery management system.
Optionally, the battery management system determines a current battery pack current value of the power battery based on the current correction parameter, including:
the battery management system determines a current pack current value of the power battery based on the current pack current value, the current correction coefficient, and the current correction compensation amount.
Optionally, the power battery current control device further includes:
if the current correction coefficient is larger than a first limiting correction threshold value, feeding back that a positive deviation exists in the battery pack current value detected by the battery management system;
And if the current correction coefficient is smaller than or equal to the first limiting correction threshold, judging whether the current correction coefficient is smaller than a second limiting correction threshold, and determining whether deviation exists in the battery pack current value detected by the battery management system according to the judging result of whether the current correction coefficient is smaller than the second limiting correction threshold.
Optionally, determining whether the current correction coefficient is smaller than a second limiting correction threshold, and determining whether a deviation exists in the battery pack current value detected by the battery management system according to a result of determining whether the current correction coefficient is smaller than the second limiting correction threshold, including:
If the current correction coefficient is smaller than a second limiting correction threshold value, feeding back that negative deviation exists in the battery pack current value detected by the battery management system;
And if the current correction coefficient is larger than or equal to a second limiting correction threshold value, feeding back that the battery pack current value 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 shows a schematic structural 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 whole vehicle controller of the electric vehicle includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which a computer program executable by the at least one processor is stored, and the processor 11 may perform various appropriate 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 the whole vehicle controller 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.
The electric vehicle 10 or a plurality of components in 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, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an 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 a complete 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.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as the power cell current control method.
In some embodiments, the power cell current control method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as the 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 a 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, the processor 11 may be configured to perform the power battery current control method in any other suitable manner (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On 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, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may 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 implemented. The computer program may execute entirely on the 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. The 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 here may be implemented on an electric vehicle or a whole vehicle controller of an electric vehicle 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 pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electric vehicle or a 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 may 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 input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background 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 background, 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. The client and server are typically 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 hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. A power battery current control method, characterized by 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 a whole vehicle controller;
when the vehicle running state is in a cruising mode and energy recovery is not started, the battery management system state is in a fault-free state, and the power distribution unit state is in a fault-free 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 whole vehicle controller, obtaining a current power distribution unit loop current value of the power distribution unit, and determining current correction parameters of a battery management system according to the current motor driving bus current value and the current power distribution unit loop current value;
The method for determining the current correction parameters of the battery management system according to the current motor driving bus current value and the current power distribution unit loop current value comprises the following steps: determining a theoretical battery pack current value of the power battery according to a current motor driving bus current value and the current power distribution unit loop current value; 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;
The battery management system determines a current battery pack current value for the power battery based on the current modification parameter.
2. The power battery current control method according to claim 1, wherein determining a present motor drive bus current value from a present motor torque, the present motor rotational speed, and the present bus voltage of the electric vehicle includes:
Acquiring a theoretical motor rotating speed, a theoretical motor torque, a theoretical bus voltage and a 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 a current motor driving bus current value according to the retrieved motor driving data comparison table stored in the whole vehicle controller, the current motor torque of the electric vehicle, the current motor rotating speed and the current bus voltage.
3. The power cell current control method according to claim 1, wherein the current correction parameters include a current correction coefficient and a current correction compensation amount;
determining a current correction parameter of a battery management system according to the theoretical battery pack current value and the initial battery pack current value, including:
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 through a PID (proportion integration differentiation) regulating system, calculating a current correction coefficient and a current correction compensation quantity of a battery management system, and writing the current correction coefficient and the current correction compensation quantity into the battery management system.
4. The power battery current control method of claim 3, wherein the battery management system determining a present battery pack current value of the power battery based on the current correction parameter comprises:
The battery management system determines a current pack current value of the power battery based on the initial pack current value, the current correction coefficient, and the current correction compensation amount.
5. The power battery current control method according to claim 3, further comprising, after determining a current correction parameter of 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 limiting correction threshold value, feeding back that a positive deviation exists in the battery pack current value detected by the battery management system;
And if the current correction coefficient is smaller than or equal to the first limiting correction threshold, judging whether the current correction coefficient is smaller than a second limiting correction threshold, and determining whether deviation exists in the battery pack current value detected by the battery management system according to the judging result of whether the current correction coefficient is smaller than the second limiting correction threshold.
6. The power battery current control method according to claim 5, wherein determining whether the current correction coefficient is smaller than a second defined correction threshold value, and determining whether a deviation exists in a 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 value, comprises:
If the current correction coefficient is smaller than a second limiting correction threshold value, feeding back that negative deviation exists in the battery pack current value detected by the battery management system;
And if the current correction coefficient is larger than or equal to a second limiting correction threshold value, feeding back that the battery pack current value detected by the battery management system is normal.
7. A power battery current control device, characterized by 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 whole 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 cruising mode and energy recovery is not started, the battery management system state is in a fault-free state and the power distribution unit state is in a fault-free state;
The current correction parameter determining module is used for obtaining the parameters of the power distribution unit through the whole vehicle controller, obtaining the current value of the current power distribution unit loop of the power distribution unit, and determining the 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 power distribution unit loop; the current correction parameters of the battery management system are determined according to the current motor driving bus current value and the current power distribution unit loop current value, and the current correction parameters are specifically used for: determining a theoretical battery pack current value of the power battery according to a current motor driving bus current value and the current power distribution unit loop current value; 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 the current battery pack current value determining module is used for executing the battery management system to determine the current battery pack current value of the power battery based on the current correction parameter.
8. An electric automobile, characterized in that it comprises:
At least one processor; and
A memory communicatively coupled to the at least one processor; wherein,
The memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the power cell current control method of any one of claims 1-6.
9. A computer readable storage medium storing computer instructions for causing a processor to implement the power cell current control method of any one of claims 1-6 when executed.
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