CN116476654A - Battery current limit protection method, device, equipment and storage medium - Google Patents

Battery current limit protection method, device, equipment and storage medium Download PDF

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Publication number
CN116476654A
CN116476654A CN202310455987.5A CN202310455987A CN116476654A CN 116476654 A CN116476654 A CN 116476654A CN 202310455987 A CN202310455987 A CN 202310455987A CN 116476654 A CN116476654 A CN 116476654A
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China
Prior art keywords
power
bridge motor
torque
determining
battery
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CN202310455987.5A
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Chinese (zh)
Inventor
杨国超
王钦
张伟超
祝挺
刘畅
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Dongfeng Off Road Vehicle Co Ltd
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Dongfeng Off Road Vehicle Co Ltd
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Priority to CN202310455987.5A priority Critical patent/CN116476654A/en
Publication of CN116476654A publication Critical patent/CN116476654A/en
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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
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • 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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses a battery current limit protection method, a device, equipment and a storage medium, wherein the method comprises the following steps: determining a first execution target torque of each bridge motor according to the peak power of each bridge motor and the peak power of the power battery; determining a torque dynamic change value of each bridge motor according to the peak power of the power battery, the discharging power of the power battery and the first execution target torque; and determining the final target torque of each bridge motor according to the first execution target torque and the torque dynamic change value. The invention distributes the power of the power battery in real time based on the peak power of each bridge motor, realizes the cooperative change of a plurality of bridge motors and protects the power battery of the vehicle by distributing the dynamic change value of the torque in real time, not only avoids the over-discharge problem of the power battery in the process of rapid acceleration and rapid deceleration running, but also realizes the synchronous change of each bridge motor, avoids abnormal driving of the vehicle caused by the torque dyssynchrony among the bridge motors, and greatly improves the running reliability and safety of the vehicle.

Description

Battery current limit protection method, device, equipment and storage medium
Technical Field
The present invention relates to the field of vehicle technologies, and in particular, to a method, an apparatus, a device, and a storage medium for protecting battery current limitation.
Background
Under the background of pursuing environmental protection and exploring new energy, electric vehicles gradually become the development direction of the automobile industry. Along with the continuous development of related technologies, the driving mode of the electric vehicle is gradually changed from single-motor centralized driving to multi-motor distributed driving, the multi-motor distributed driving effectively reduces the transmission distance, and meanwhile, the multi-motor distributed driving mode has higher requirements on the control method of the motor controller.
In the existing multi-motor distributed driving vehicle, over-discharge faults and poor protection faults often occur to a power battery, and in addition, the problem that the torque change of the bridge motor is asynchronous due to the fact that the torque of the bridge motor is not coordinated with the current protection of the power battery is often caused.
Disclosure of Invention
In view of the above-mentioned drawbacks or improvements of the prior art, it is an object of the present invention to provide a battery current limit protection method, apparatus, device and storage medium.
To achieve the purpose, the invention adopts the following technical scheme:
the invention provides a battery current limiting protection method, which comprises the following steps:
determining a first execution target torque of each bridge motor according to the peak power of each bridge motor and the peak power of the power battery;
determining a torque dynamic change value of each bridge motor according to the peak power of the power battery, the discharging power of the power battery and the first execution target torque;
determining the final target torque of each bridge motor according to the first execution target torque and the torque dynamic change value:
T j ＝T 1j -ΔT j ；
wherein T is j Final target torque for the jth bridge motor，T 1j For the first execution target torque of the jth bridge motor, deltaT j The torque dynamic change value of the jth bridge motor.
Further, the step of determining the first execution target torque of each bridge motor according to the peak power of each bridge motor and the peak power of the power battery comprises the following steps:
determining the maximum available power allowed by each bridge motor according to the peak power of each bridge motor and the peak power of the power battery;
determining the maximum target torque which is allowed to be output by each bridge motor according to the maximum available power;
and determining a first execution target torque of each bridge motor according to the maximum target torque.
Further, the step of determining the maximum available power allowed by each bridge motor according to the peak power of each bridge motor and the peak power of the power battery comprises the following steps:
determining a first proportional coefficient of each bridge motor according to the peak power of each bridge motor:
wherein K is j For the first proportional coefficient, P, of the jth bridge motor fj For the jth bridge motor peak power, n is the total bridge motor number configured for the vehicle.
Further, the step of determining the maximum available power allowed by each bridge motor according to the peak power of each bridge motor and the peak power of the power battery further comprises the following steps:
determining the maximum available power allowed by each bridge motor according to the first proportion coefficient and the peak power of the power battery:
P maxj ＝P bmsmax ·K j ；
wherein P is maxj Maximum available power, P, allowed for the jth bridge motor bmsmax Is the peak power of the power battery.
Further, the step of determining the maximum target torque that each bridge motor is allowed to output according to the maximum available power includes:
determining the maximum target torque which is allowed to be output by each bridge motor according to the current rotating speed and the acceleration of the rotating speed of each bridge motor and the maximum available power:
wherein T is maxj Maximum target torque, w, for the permissible output of the jth bridge motor j For the current speed of the jth bridge motor,and the delta t is the set execution time period for the acceleration of the current rotation speed of the jth bridge motor.
Further, the step of determining a first execution target torque of each bridge motor according to the maximum target torque includes:
determining a first execution target torque of each bridge motor according to the driver intention target torque and the maximum target torque:
T 1j ＝min(T maxj ,T dj )；
wherein T is dj The driver intended target torque for the jth bridge motor.
Further, the step of determining a torque dynamic change value of each bridge motor according to the power battery peak power, the power battery discharge power and the first execution target torque includes:
determining a dynamic change total reference value of torque according to the peak power of the power battery and the discharge power of the power battery;
determining a second proportionality coefficient of each bridge motor according to the first execution target torque;
determining the torque dynamic change value of each bridge motor according to the dynamic change reference total value of the torque and the second proportionality coefficient:
ΔT j ＝δ j ·T c ；
wherein delta j A second proportionality coefficient of the jth bridge motor, T c Is a dynamically changing total reference value for torque.
Further, the step of determining a dynamically changing total reference value of torque according to the peak power of the power battery and the discharge power of the power battery includes:
determining a functional relation between the dynamic change total reference value of the torque and the power difference between the peak power of the power battery and the discharge power of the power battery;
and determining a dynamic change total reference value of the current torque according to the functional relation.
Further, the functional relationship is:
when the power battery discharge power is greater than the power battery peak power, the expression of the functional relationship is:
when the power battery discharge power is less than or equal to the power battery peak power, the expression of the functional relationship is:
T c ＝0；
wherein U is the total voltage of the current power battery, I is the discharge current of the current power battery, beta 1 Is a proportionality coefficient, beta 2 Is an integral coefficient, t is U.I greater than P bmsmax Duration of time.
Further, the step of determining a second scaling factor for each bridge motor based on the first execution target torque includes:
determining a second proportionality coefficient of each bridge motor according to the ratio of the first execution target torque of each bridge motor to the sum of the first execution torques of each bridge motor:
where n is the total number of bridge motors configured for the vehicle.
The invention also provides a battery current limiting protection device, which comprises:
the first module is used for obtaining peak power of each bridge motor, peak power of the power battery and discharge power of the power battery;
the second module is used for determining a first execution target torque, a torque dynamic change value and a final target torque of each bridge motor; and
and a third module for controlling each bridge motor to output torque according to the final target torque.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the battery current limiting protection method when executing the computer program.
The invention also proposes a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the battery current limit protection method.
The invention has the beneficial effects that:
according to the peak power of each bridge motor and the peak power of the power battery, the first execution torque of each bridge motor is determined, and the power of the power battery is distributed in real time through the relation between the peak powers of each bridge motor; determining the torque dynamic change value of each bridge motor according to the peak power of the power battery, the discharging power of the power battery and the first execution target torque, and realizing the cooperative change of a plurality of bridge motors and protecting the power battery of the vehicle by distributing the torque dynamic change value in real time; according to the first execution target torque and the torque dynamic change value, the final target torque of each bridge motor is determined, so that the problem of over-discharge of a power battery in the processes of uniform-speed running, small-acceleration running, rapid acceleration and rapid deceleration running is avoided, synchronous change of each bridge motor is realized, abnormal driving of an automobile caused by torque dyssynchrony among the bridge motors is avoided, and the running reliability and safety of the vehicle are greatly improved.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flow chart of a battery current limit protection method in an embodiment of the invention;
fig. 2 is a schematic view of a battery current limiting protection device in an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The embodiment provides a battery current limiting protection method which is applied to an electric control system of an electric automobile.
The flow chart of the battery current limiting protection method in this embodiment is shown in fig. 1, and includes steps S10-S30.
And S10, determining a first execution torque of each bridge motor according to the peak power of each bridge motor and the peak power of the power battery.
Further, step S10 includes steps S101-S103.
S101, determining the maximum allowable power of each bridge motor according to the peak power of each bridge motor and the peak power of the power battery.
As a possible implementation, step S101 may be implemented by:
and determining a first proportional coefficient of each bridge motor according to the peak power of each bridge motor.
Specifically, in this embodiment, the calculation formula of the first proportional coefficient of each bridge motor is:
wherein K is j For the first proportional coefficient, P, of the jth bridge motor fj For the jth bridge motor peak power, n is the total bridge motor number configured for the vehicle.
It can be understood that in this embodiment, the first ratio coefficient of each bridge motor is a ratio of the peak power of each bridge motor to the total value of the peak power of the whole vehicle bridge motor.
Determining the maximum available power allowed by each bridge motor according to the first proportion coefficient and the peak power of the power battery:
P maxj ＝P bmsmax ·K j ；
wherein P is maxj Maximum available power, P, allowed for the jth bridge motor bmsmax In this embodiment, the peak power of the power battery is calculated by the power battery management system according to the working state of the power battery.
As can be understood from the foregoing embodiments, in this embodiment, the maximum available power allowed by each bridge motor is that the peak power of the power battery is distributed to each bridge motor according to the ratio of the peak power of each bridge motor, so that each bridge motor can output according to the maximum output capability at the same time.
As a further possible embodiment, step S101 may also be implemented by:
calculating the ratio of the peak power of each bridge motor to the minimum value in the peak power of the whole bridge motor in real time according to the minimum value reference in the peak power of the whole bridge motor:
wherein K is 1j The ratio of the peak power of the jth bridge motor to the minimum value in the peak power of the whole vehicle bridge motor is set. It will be appreciated that K 1j And 1 or more.
Calculating the sum of the ratio of the peak power of each bridge motor to the minimum value in the peak power of the whole vehicle motor:
wherein K is h Is the sum of the ratio of the peak power of each bridge motor to the minimum value in the peak power of the whole vehicle motor.
And calculating the reference allowable used reference power of the bridge motor according to the sum of the ratio of the peak power of each bridge motor to the minimum value in the peak power of the whole vehicle motor and the peak power of the power battery. The bridge motor reference allows the sum of the ratio of the used reference power multiplied by the peak power of each bridge motor to the minimum value in the peak power of the whole vehicle motor to be equal to the peak power of the power battery, namely:
P bmsmax ＝P m *K h ；
further, it is known that bridge motor reference allows the use of a base power:
wherein P is m Reference is made to the allowed reference power for the bridge motor.
Calculating the maximum available power allowed by each bridge motor based on the reference power allowed to be used by the bridge motor and the ratio of the peak power of each bridge motor to the minimum value in the peak power of the whole vehicle bridge motor:
P maxj ＝P m *K 1j 。
further, it can be seen that:
the peak power of the power battery is distributed to each bridge motor according to the peak power relation proportion of each bridge motor, so that each bridge motor can output according to the maximum capacity at the same time.
S102, determining the maximum target torque which is allowed to be output by each bridge motor according to the maximum available power.
As a possible implementation, step S102 may be implemented by:
determining the maximum target torque which is allowed to be output by each bridge motor according to the current rotating speed and the acceleration of the rotating speed of each bridge motor and the maximum available power:
wherein T is maxj Maximum target torque, w, for the permissible output of the jth bridge motor j For the current speed of the jth bridge motor,and the delta t is the set execution time period for the acceleration of the current rotation speed of the jth bridge motor.
It will be appreciated that in this embodiment, the rotational speed of each bridge motor is obtained by a wheel speed sensor, and the acceleration of each bridge motor rotational speed is obtained by an acceleration sensor.
Further, in the calculation formula of the maximum target torque allowed to be output by each bridge motor, the calculated rotating speed takes the value asIt can be seen that in this embodiment, the calculation of the rotation speed takes into account the influence of the acceleration on the rotation speed, so as to avoid the excessive calculation of the maximum target torque caused by the acceleration.
S103, determining the first executing torque of each bridge motor according to the maximum target torque.
As a possible implementation, step S103 may be implemented by:
determining a first execution torque of each bridge motor according to the driver intention target torque and the maximum target torque:
T 1j ＝min(T maxj ,T dj )；
wherein T is dj The driver intended target torque for the jth bridge motor.
Specifically, the driver-intended target torque of each bridge motor is calculated based on the accelerator opening degree.
When the vehicle runs at a constant speed and runs at a small acceleration, if the motors of each bridge are controlled to output torque according to the first execution torque, the power battery can be prevented from being excessively high in current, and therefore the power battery is protected. However, when the vehicle runs in rapid acceleration and rapid deceleration, the system response delay can cause the problem of instantaneous over-discharge of the power battery. Therefore, a control method for avoiding the instantaneous overdischarge of the power battery during the rapid acceleration and deceleration running of the vehicle is also required to be designed.
Referring to fig. 1, the battery current limiting protection method in this embodiment further includes: and S20, determining the torque dynamic change value of each bridge motor according to the peak power of the power battery, the discharge power of the power battery and the first execution torque.
Specifically, step S20 also includes steps S201-S203.
S201, determining a dynamic change total reference value of the torque according to the peak power of the power battery and the discharge power of the power battery.
As a possible implementation, step S201 may be implemented by:
determining a function relation of a dynamic change total reference value of torque and a power difference of peak power of a power battery and discharge power of the power battery: when the power battery discharge power is greater than the power battery peak power, the expression of the functional relationship is:
when the power battery discharge power is less than or equal to the power battery peak power, the expression of the functional relationship is:
T c ＝0；
wherein T is c The total reference value of the dynamic change of the torque is U is the total voltage of the current power battery, I is the discharge current of the current power battery, beta 1 Is a proportionality coefficient, beta 2 Is an integral coefficient, t is U.I greater than P bmsmax Duration of time.
And determining a dynamic change total reference value of the current torque according to the functional relation.
The battery current limiting protection method of the embodiment obtains the discharging power of the power battery in real time, and calculates a dynamic change total reference value of the torque according to the discharging power of the power battery, wherein if the discharging power of the power battery is larger than the peak power of the power battery, a PI algorithm is adopted, and the dynamic change total reference value of the torque is calculated according to the power difference between the discharging power of the power battery and the peak power of the power battery. And if the power battery discharging power is smaller than or equal to the power battery peak power, the total dynamic change reference value of the torque takes a value of 0.
After the total dynamic change reference value of the torque is determined, the total dynamic change reference value of the torque is distributed according to the proportion, and the dynamic change value of the torque of each bridge motor is determined.
S202, determining a second proportionality coefficient of each bridge motor according to the first executing torque.
As a possible implementation, step S202 may be implemented by the calculation method (1):
determining a second scaling factor of each bridge motor according to the ratio of the first execution torque of each bridge motor to the sum of the first execution torques of each bridge motor:
wherein delta j A second scaling factor for the jth bridge motor.
As another possible implementation, step S202 may also be implemented by the calculation method (2):
taking the minimum value of the first execution torque of each bridge motor as a reference, calculating the ratio of the first execution torque of each bridge motor to the minimum value of the first execution torque of the whole vehicle bridge motor:
wherein: k (K) 2j -the ratio of the j-th bridge motor first execution torque to the minimum value of the vehicle bridge motor first execution torque.
Further, it can be seen that:
T 1j ＝min 1≤j≤n T 1j ·K 2j 。
calculating the percentage of the ratio of the first execution torque of each bridge motor to the minimum value of the first execution torque of the whole bridge motor to the sum of the ratio of the first execution torque of each bridge motor to the minimum value of the first execution torque of the whole bridge motor:
s203, determining the torque dynamic change value of each bridge motor according to the dynamic change reference total value of the torque and the second proportionality coefficient:
ΔT j ＝δ j ·T c ；
wherein DeltaT j The torque dynamic change value of the jth bridge motor. As can be seen from the above calculation process, in this embodiment, the sum of the torque dynamic change values of the bridge motors is equal to the dynamic dialect total reference value of the torque for the transient protection of the power battery current.
The second proportional coefficient determined by the calculation method (1) is taken into a calculation formula of the torque dynamic change value of each bridge motor, and the calculation formula shows that:
further, it can be seen that:
then there are:
after computational simplification, the derivation can be:
namely:
the sum of the torque dynamic change values of the bridge motors is equal to the dynamic change total reference value of the torque of the transient protection of the power battery.
The second proportional coefficient determined by the calculation method (2) is taken into a calculation formula of the torque dynamic change value of each bridge motor, and the calculation formula shows that:
further, the torque dynamic change value of each bridge motor can be known:
further, it can be seen that:
further, it can be seen that:
further, it can be seen that:
further, it can be seen that:
namely:
the sum of the torque dynamic change values of the bridge motors is equal to the dynamic change total reference value of the torque of the transient protection of the power battery.
In summary, the second scaling factor obtained by the calculation method (1) and the calculation method (2) is used to determine the torque dynamic change value of each bridge motor, which all satisfy that the sum of the torque dynamic change values of each bridge motor is equal to the dynamic change total reference value of the torque of the transient protection of the power battery.
With continued reference to fig. 1, the battery current limiting protection method in this embodiment further includes: s30, determining the final target torque of each bridge motor according to the first execution torque and the torque dynamic change value:
T j ＝T 1j -ΔT j ；
wherein T is j Is the final target torque for the jth bridge motor.
And subtracting the torque dynamic change value of each bridge motor on the basis of the first execution torque of each bridge motor to obtain the final target torque of each bridge motor, and dynamically protecting the power battery in the process of rapid acceleration and rapid deceleration running.
Bringing the second proportionality coefficient obtained by the calculation method (1) into the final target torque of each bridge motor:
further, it is possible to obtain:
ensure synchronous change of motors of each bridge, and T j And 0 or more.
When (when)T j ＝0。
Bringing the second proportionality coefficient obtained by the calculation method (2) into the final target torque of each bridge motor:
further, the method comprises the steps of,
ensure synchronous change of motors of each bridge, and T j And 0 or more.
When (when)T j ＝0。
The battery current limiting protection method in the embodiment carries out real-time distribution on the power of the power battery based on the peak power of each bridge motor, realizes the cooperative change of a plurality of bridge motors and protects the power battery of the vehicle by distributing the torque dynamic change value in real time, not only avoids the over-discharge problem of the power battery in the process of rapid acceleration and rapid deceleration running, but also realizes the synchronous change of each bridge motor, avoids abnormal driving of the vehicle caused by the torque asynchronism among the bridge motors, and greatly improves the running reliability and safety of the vehicle.
The present embodiment also provides a battery current limiting protection device, and fig. 2 is a schematic diagram of the battery current limiting protection device provided in the present embodiment.
As shown in fig. 2, the battery current limit protection device includes a first module 21, a second module 22, and a third module 23.
The first module 21 is configured to obtain peak power of each bridge motor, peak power of the power battery, and discharge power of the power battery.
The second module 22 is configured to determine a first execution target torque, a torque dynamics value, and a final target torque for each bridge motor.
The third module 23 is configured to control each of the bridge motors to output torque according to the final target torque.
It should be noted that, the battery current limiting protection device provided in this embodiment may also be a computer program (including program code) running in a computer device, for example, the battery current limiting protection device is an application program, and may be used to execute the corresponding steps in the above method provided in the embodiment of the present application. In some possible implementations, the battery current limiting protection device provided in this embodiment may be implemented in a combination of software and hardware. In some possible implementations, the battery current limiting protection device provided in this embodiment may be implemented in software, which may be software in the form of a program, a plug-in unit, or the like, and includes a series of modules to implement the battery current limiting protection method provided in this embodiment of the present invention.
The present embodiment also provides an electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor. It can be appreciated that, in the electronic device of the embodiment of the present application, the battery current limiting protection method in the embodiment may be implemented when the processor executes the computer program.
The present embodiment also provides a computer-readable storage medium having a computer program stored thereon, which when executed by a processor, implements the steps of the battery current limit protection method in the present embodiment.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims (13)

1. A battery current limiting protection method, comprising the steps of:
determining a first execution target torque of each bridge motor according to the peak power of each bridge motor and the peak power of the power battery;
determining a torque dynamic change value of each bridge motor according to the peak power of the power battery, the discharging power of the power battery and the first execution target torque;
determining the final target torque of each bridge motor according to the first execution target torque and the torque dynamic change value:
T j ＝T 1j -ΔT j ；
wherein T is j For the final target torque of the jth bridge motor, T 1j For the first execution target torque of the jth bridge motor, deltaT j The torque dynamic change value of the jth bridge motor.
2. The battery current limit protection method of claim 1, wherein the step of determining the first execution target torque for each bridge motor based on each bridge motor peak power and power battery peak power comprises:
determining the maximum available power allowed by each bridge motor according to the peak power of each bridge motor and the peak power of the power battery;
determining the maximum target torque which is allowed to be output by each bridge motor according to the maximum available power;
and determining a first execution target torque of each bridge motor according to the maximum target torque.
3. A battery current limit protection method as defined in claim 2, wherein said step of determining the maximum available power allowed by each bridge motor based on each bridge motor peak power and said power battery peak power comprises:
determining a first proportional coefficient of each bridge motor according to the peak power of each bridge motor:
wherein K is j For the first proportional coefficient, P, of the jth bridge motor fj For the jth bridge motor peak power, n is the total bridge motor number configured for the vehicle.
4. A battery current limit protection method in accordance with claim 3, wherein said step of determining the maximum available power permitted by each bridge motor based on each bridge motor peak power and said power battery peak power further comprises:
determining the maximum available power allowed by each bridge motor according to the first proportion coefficient and the peak power of the power battery:
P maxj ＝P bmsmax ·K j ；
wherein P is maxj Maximum available power, P, allowed for the jth bridge motor bmsmax Is the peak power of the power battery.
5. A battery current limit protection method according to claim 3, wherein said step of determining a maximum target torque that each bridge motor is permitted to output based on said maximum available power comprises:
determining the maximum target torque which is allowed to be output by each bridge motor according to the current rotating speed and the acceleration of the rotating speed of each bridge motor and the maximum available power:
wherein T is maxj Maximum target torque, w, for the permissible output of the jth bridge motor j For the current speed of the jth bridge motor,and the delta t is the set execution time period for the acceleration of the current rotation speed of the jth bridge motor.
6. The battery current limit protection method according to claim 5, wherein the step of determining the first execution target torque of each bridge motor based on the maximum target torque includes:
determining a first execution target torque of each bridge motor according to the driver intention target torque and the maximum target torque:
T 1j ＝min(T maxj ,T dj )；
wherein T is dj The driver intended target torque for the jth bridge motor.
7. The battery current limit protection method according to claim 6, wherein the step of determining a torque dynamic change value of each bridge motor according to the power battery peak power, power battery discharge power, and the first execution target torque comprises:
determining a dynamic change total reference value of torque according to the peak power of the power battery and the discharge power of the power battery;
determining a second proportionality coefficient of each bridge motor according to the first execution target torque;
determining the torque dynamic change value of each bridge motor according to the dynamic change reference total value of the torque and the second proportionality coefficient:
ΔT j ＝δ j ·T c ；
wherein delta j A second proportionality coefficient of the jth bridge motor, T c Is the movement of torqueTotal reference value of state change.
8. The battery current limit protection method of claim 7, wherein said step of determining a dynamically changing total reference value of torque based on said power cell peak power and said power cell discharge power comprises:
determining a functional relation between the dynamic change total reference value of the torque and the power difference between the peak power of the power battery and the discharge power of the power battery;
and determining a dynamic change total reference value of the current torque according to the functional relation.
9. The battery current limit protection method of claim 8, wherein the functional relationship is:
when the power battery discharge power is greater than the power battery peak power, the expression of the functional relationship is:
when the power battery discharge power is less than or equal to the power battery peak power, the expression of the functional relationship is:
T c ＝0；
wherein U is the total voltage of the current power battery, I is the discharge current of the current power battery, beta 1 Is a proportionality coefficient, beta 2 Is an integral coefficient, t is U.I greater than P bmsmax Duration of time.
10. The battery current limit protection method according to claim 7, wherein the step of determining a second scaling factor for each bridge motor based on the first execution target torque comprises:
determining a second proportionality coefficient of each bridge motor according to the ratio of the first execution target torque of each bridge motor to the sum of the first execution torques of each bridge motor:
where n is the total number of bridge motors configured for the vehicle.
11. A battery current limiting protection device, comprising:
the first module is used for obtaining peak power of each bridge motor, peak power of the power battery and discharge power of the power battery;
the second module is used for determining a first execution target torque, a torque dynamic change value and a final target torque of each bridge motor; and
and a third module for controlling each bridge motor to output torque according to the final target torque.
12. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the battery current limit protection method of any of claims 1-8 when the computer program is executed by the processor.
13. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the battery current limit protection method according to any of claims 1-8.
CN202310455987.5A 2023-04-25 2023-04-25 Battery current limit protection method, device, equipment and storage medium Pending CN116476654A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310455987.5A CN116476654A (en) 2023-04-25 2023-04-25 Battery current limit protection method, device, equipment and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310455987.5A CN116476654A (en) 2023-04-25 2023-04-25 Battery current limit protection method, device, equipment and storage medium

Publications (1)

Publication Number Publication Date
CN116476654A true CN116476654A (en) 2023-07-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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