CN111823882A - Electric automobile electric drive control method applied to assembling double battery packs - Google Patents

Electric automobile electric drive control method applied to assembling double battery packs Download PDF

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Publication number
CN111823882A
CN111823882A CN202010661423.3A CN202010661423A CN111823882A CN 111823882 A CN111823882 A CN 111823882A CN 202010661423 A CN202010661423 A CN 202010661423A CN 111823882 A CN111823882 A CN 111823882A
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battery pack
power
drive
soc
electric automobile
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Chinese (zh)
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宗向荣
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Dilu Technology Co Ltd
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Dilu Technology Co Ltd
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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
    • 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]
    • 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
    • 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
    • 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
    • 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
    • Y02T10/72—Electric energy management in electromobility

Abstract

The invention discloses an electric vehicle electric drive control method applied to assembling double battery packs, which comprises the steps of obtaining a first SOC of a front battery pack of an electric vehicle and a second SOC of a rear battery pack, entering a front and rear pack power following control mode when the first SOC and the second SOC are both smaller than a limit value, obtaining the power of the front battery pack, determining the total output torque of a front drive according to the power of the front battery pack and the motor rotating speed corresponding to the current speed of the electric vehicle when the total power required by the front drive of the electric vehicle is greater than the power of the front battery pack, determining the external torque output of the front battery pack, obtaining the power of the rear battery pack, determining the total output torque of the rear drive according to the power of the rear battery pack and the motor rotating speed corresponding to the current speed of the electric vehicle when the total power required by the rear drive of the electric vehicle is greater than the power of the rear battery pack, determining the external torque output of the rear battery pack, and reasonably controlling the, the service efficiency of the front battery pack and the rear battery pack in the electric automobile is improved.

Description

Electric automobile electric drive control method applied to assembling double battery packs
Technical Field
The invention relates to the technical field of electric automobile control, in particular to an electric automobile drive control method applied to assembling double battery packs.
Background
After the pure electric vehicle is developed at a high speed in recent years, some technical problems which cannot be solved at the current stage are gradually exposed, wherein the low charging speed is a main problem which restricts the rapid development of the electric vehicle at present, and a plurality of solutions are provided for solving the problem, wherein a double battery pack is configured for the whole vehicle. The power supply problem of the electric vehicle is relieved to a certain extent by configuring the double-battery pack for the whole vehicle, but the flexibility of a power supply control strategy for double batteries is low.
Disclosure of Invention
In order to solve the problems, the invention provides an electric automobile electric drive control method applied to assembling double battery packs.
In order to achieve the purpose of the invention, the invention provides an electric driving control method of an electric automobile for assembling a double battery pack, which comprises the following steps:
s10, acquiring the SOC of a front battery pack of the electric automobile to obtain a first SOC, and acquiring the SOC of a rear battery pack of the electric automobile to obtain a second SOC;
s20, when the first SOC and the second SOC are both smaller than a preset limit value, entering a front and rear packet power following control mode;
s30, after entering a front and rear pack power following control mode, obtaining front battery pack power, when the front drive total power required by the electric automobile is larger than the front battery pack power, determining front drive total output torque according to the front battery pack power and the motor rotating speed corresponding to the current speed of the electric automobile, determining external torque output of the front battery pack according to the front drive total output torque, obtaining rear battery pack power, when the rear drive total power required by the electric automobile is larger than the rear battery pack power, determining rear drive total output torque according to the rear battery pack power and the motor rotating speed corresponding to the current speed of the electric automobile, and determining external torque output of the rear battery pack according to the rear drive total output torque.
In one embodiment, the above electric drive control method for an electric vehicle equipped with a dual battery pack further includes:
when the total power required by the forerunner of the electric automobile is less than or equal to the power of the front battery pack, determining the torque output of the front battery pack according to the required power of the forerunner; and when the total power required by the rear drive of the electric automobile is less than or equal to the power of the rear battery pack, determining the torque output of the rear battery pack according to the power required by the rear drive.
In one embodiment, the above equation for determining the total output torque from the front wheel drive includes:
Figure BDA0002578680710000021
in the formula, T1Representing total forward drive output torque, P1Representing the front pack power, n1And the motor rotating speed corresponding to the front drive speed of the electric automobile is represented.
In one embodiment, the above formula for determining the total output torque of the rear drive includes:
Figure BDA0002578680710000022
in the formula, T2Representing total output torque of rear drive, P2Representing rear package power, n2And the motor rotating speed corresponding to the rear drive speed of the electric automobile is represented.
In one embodiment, the above electric drive control method for an electric vehicle equipped with a dual battery pack further includes:
and when the first SOC and the second SOC are both larger than a preset limit value, determining the torque output of the front battery pack according to the front driving required power, and determining the torque output of the rear battery pack according to the rear driving required power.
The electric automobile electric drive control method applied to assembling the double battery packs obtains a first SOC by obtaining the SOC of a front battery pack of the electric automobile, obtains a second SOC, enters a front and rear pack power following control mode when the first SOC and the second SOC are both smaller than a preset limit value, obtains the power of the front battery pack after entering the front and rear pack power following control mode, determines the front drive total output torque according to the front battery pack power and the motor rotating speed corresponding to the current speed of the electric automobile when the front drive total power demand of the electric automobile is larger than the front battery pack power, determines the external torque output of the front battery pack according to the front drive total output torque, obtains the rear battery pack power, determines the rear drive total output torque according to the rear battery pack power and the motor rotating speed corresponding to the current speed of the electric automobile when the rear drive total power demand of the electric automobile is larger than the rear battery pack power, the external torque output of the rear battery pack is determined according to the rear-drive total output torque, so that the front battery pack and the rear battery pack of the electric automobile are reasonably controlled, and the service efficiency of the front battery pack and the rear battery pack in the electric automobile is improved.
Drawings
FIG. 1 is a flowchart of an electric drive control method for an electric vehicle equipped with a dual battery pack according to an embodiment;
FIG. 2 is a policy flow diagram for one embodiment;
FIG. 3 is a schematic diagram of a system-enabled policy model in one embodiment;
FIG. 4 is a diagram of an implementation model of a control strategy in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, fig. 1 is a flowchart of an electric drive control method for an electric vehicle equipped with a dual battery pack according to an embodiment, including the following steps:
and S10, acquiring the SOC (state of charge) of the front battery pack of the electric automobile to obtain a first SOC, and acquiring the SOC of the rear battery pack of the electric automobile to obtain a second SOC.
And S20, when the first SOC and the second SOC are both smaller than the preset limit value, entering a front and back packet power following control mode.
The above-mentioned limit value can be set according to the performance characteristics of the front battery pack and the rear battery pack of the electric vehicle. In general, when the first SOC is greater than or equal to the preset limit, the front battery pack may determine the torque output of the front battery pack according to the front drive required power of the electric vehicle, and when the second SOC is greater than or equal to the preset limit, the rear battery pack may determine the torque output of the front battery pack according to the rear drive required power of the electric vehicle.
The front-rear pack power follow control mode is a mode for performing corresponding pack torque output control according to the respective corresponding magnitudes of the first SOC and the second SOC, and the specific control process is as shown in step S30.
S30, after entering a front and rear pack power following control mode, obtaining front battery pack power, when the front drive total power required by the electric automobile is larger than the front battery pack power, determining front drive total output torque according to the front battery pack power and the motor rotating speed corresponding to the current speed of the electric automobile, determining external torque output of the front battery pack according to the front drive total output torque, obtaining rear battery pack power, when the rear drive total power required by the electric automobile is larger than the rear battery pack power, determining rear drive total output torque according to the rear battery pack power and the motor rotating speed corresponding to the current speed of the electric automobile, and determining external torque output of the rear battery pack according to the rear drive total output torque.
The electric automobile electric drive control method applied to assembling the double battery packs obtains a first SOC by obtaining the SOC of a front battery pack of the electric automobile, obtains a second SOC, enters a front and rear pack power following control mode when the first SOC and the second SOC are both smaller than a preset limit value, obtains the power of the front battery pack after entering the front and rear pack power following control mode, determines the front drive total output torque according to the front battery pack power and the motor rotating speed corresponding to the current speed of the electric automobile when the front drive total power demand of the electric automobile is larger than the front battery pack power, determines the external torque output of the front battery pack according to the front drive total output torque, obtains the rear battery pack power, determines the rear drive total output torque according to the rear battery pack power and the motor rotating speed corresponding to the current speed of the electric automobile when the rear drive total power demand of the electric automobile is larger than the rear battery pack power, the external torque output of the rear battery pack is determined according to the rear-drive total output torque, so that the front battery pack and the rear battery pack of the electric automobile are reasonably controlled, and the service efficiency of the front battery pack and the rear battery pack in the electric automobile is improved.
In one embodiment, the above electric drive control method for an electric vehicle equipped with a dual battery pack further includes:
when the total precursor required power of the electric automobile is less than or equal to the power of the front battery pack, determining the torque output of the front battery pack according to the precursor required power of the electric automobile; and when the total power required by the rear drive of the electric automobile is less than or equal to the power of the rear battery pack, determining the torque output of the rear battery pack according to the power required by the rear drive.
In one embodiment, the above equation for determining the total output torque from the front wheel drive includes:
Figure BDA0002578680710000041
in the formula, T1Representing total forward drive output torque, P1Representing the front pack power, n1And the motor rotating speed corresponding to the front drive speed of the electric automobile is represented.
In one embodiment, the above formula for determining the total output torque of the rear drive includes:
Figure BDA0002578680710000042
in the formula, T2Representing total output torque of rear drive, P2Representing rear package power, n2And the motor rotating speed corresponding to the rear drive speed of the electric automobile is represented.
In one embodiment, the above electric drive control method for an electric vehicle equipped with a dual battery pack further includes:
and when the first SOC and the second SOC are both larger than a preset limit value, determining the torque output of the front battery pack according to the front drive required power of the electric automobile, and determining the torque output of the rear battery pack according to the rear drive required power of the electric automobile.
Specifically, the first SOC and the second SOC are both smaller than a preset limit value, which indicates that the SOC powers of the front battery pack and the rear battery pack of the electric automobile are not matched, and the first SOC and the second SOC are both larger than the preset limit value, which indicates that the SOC powers of the front battery pack and the rear battery pack of the electric automobile are matched. In an example, referring to fig. 2, when a power requirement of a whole vehicle is received, the front and rear battery packs enter a front and rear battery pack SOC power matching module, if matching meets a judgment condition, the whole vehicle enters a whole vehicle drive control system, and if the matching does not meet the judgment condition, a double-pack matching following system module is entered.
In another example, referring to fig. 3, in fig. 3, the preset limit is 20, when the SOC of the front and rear battery packs is greater than the limit, no enable signal is sent out, and only when the SOC of the front and rear battery packs is less than the certain limit, an enable signal is sent out to enter the front and rear pack power following control mode. Referring to fig. 4, the power of the front and rear battery packs is input from the outside, the total power of the front and rear drives is determined by the power of the front and rear battery packs, when fig. 3 is in a corresponding condition, an enable signal is sent, the control strategy of fig. 4 is entered, and the total torque of the front and rear shafts is output.
The calculation process may include: the input signals are the real-time power of the front battery pack, the total power of the front drive, the real-time power of the rear battery pack, the total power of the rear drive and the rotating speed of the motor. The basic formula of the following battery pack power output torque calculation is as follows:
Figure BDA0002578680710000051
wherein T represents the output torque (e.g., total output torque for forward drive or total output torque for rear drive), P1The power of the battery pack (such as the power of the front battery pack or the power of the rear battery pack) is represented, and n represents the motor rotating speed corresponding to the current speed of the electric automobile.
When the total power required by the front drive is less than or equal to the power of the front battery pack, normally sending torque according to the required power; when the total power required by the front drive is larger than the power of the front battery pack, the external torque is output along with the power of the battery pack. The back-drive control principle is the same, the lower graph shows a basic control strategy model graph, and specific numerical values need to be adjusted by combining specific whole vehicle and simulation verification conditions.
The example provides a control strategy scheme of a whole vehicle electric drive system matched with a double battery pack, and aims to meet the scheme of carrying the whole vehicle with the double battery pack when in need; for the change situation of two battery packs in the use working condition, the torque control of a front and rear axle driving system is required; for the scheme of carrying the double battery packs on the whole vehicle, and under the condition that the battery packs are in a low SOC state, the control strategy is adjusted to meet the working condition requirement of the whole vehicle; the dual battery pack matched vehicle electric drive system control strategy scheme provided by the present example may be used. It has the following advantages:
providing a control strategy scheme for carrying double battery packs and driving systems of a front axle and a rear axle of a whole vehicle;
the control strategy scheme under the multi-transient working condition of the required power of the whole vehicle under the actual working condition can be met;
a drive system control strategy solution is provided when the battery pack is in a low SOC condition.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It should be noted that the terms "first \ second \ third" referred to in the embodiments of the present application merely distinguish similar objects, and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may exchange a specific order or sequence when allowed. It should be understood that "first \ second \ third" distinct objects may be interchanged under appropriate circumstances such that the embodiments of the application described herein may be implemented in an order other than those illustrated or described herein.
The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, product, or device.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (5)

1. An electric drive control method of an electric automobile applied to assembling a double battery pack is characterized by comprising the following steps:
s10, acquiring the SOC of a front battery pack of the electric automobile to obtain a first SOC, and acquiring the SOC of a rear battery pack of the electric automobile to obtain a second SOC;
s20, when the first SOC and the second SOC are both smaller than a preset limit value, entering a front and rear packet power following control mode;
s30, after entering a front and rear pack power following control mode, obtaining front battery pack power, when the front drive total power required by the electric automobile is larger than the front battery pack power, determining front drive total output torque according to the front battery pack power and the motor rotating speed corresponding to the current speed of the electric automobile, determining external torque output of the front battery pack according to the front drive total output torque, obtaining rear battery pack power, when the rear drive total power required by the electric automobile is larger than the rear battery pack power, determining rear drive total output torque according to the rear battery pack power and the motor rotating speed corresponding to the current speed of the electric automobile, and determining external torque output of the rear battery pack according to the rear drive total output torque.
2. The electric drive control method for an electric vehicle equipped with a dual battery pack according to claim 1, further comprising:
when the total power required by the forerunner of the electric automobile is less than or equal to the power of the front battery pack, determining the torque output of the front battery pack according to the required power of the forerunner; and when the total power required by the rear drive of the electric automobile is less than or equal to the power of the rear battery pack, determining the torque output of the rear battery pack according to the power required by the rear drive.
3. The electric drive control method for an electric vehicle equipped with a dual battery pack as set forth in claim 1, wherein the formula for determining the total output torque of the front drive includes:
Figure FDA0002578680700000011
in the formula, T1Representing total forward drive output torque, P1Representing the front pack power, n1And the motor rotating speed corresponding to the front drive speed of the electric automobile is represented.
4. The electric drive control method for an electric vehicle equipped with a dual battery pack as set forth in claim 1, wherein the formula for determining the total output torque of the rear drive includes:
Figure FDA0002578680700000012
in the formula, T2Representing total output torque of rear drive, P2Representing rear package power, n2And the motor rotating speed corresponding to the rear drive speed of the electric automobile is represented.
5. The electric drive control method for an electric vehicle equipped with a dual battery pack according to claim 1, further comprising:
and when the first SOC and the second SOC are both larger than a preset limit value, determining the torque output of the front battery pack according to the front driving required power, and determining the torque output of the rear battery pack according to the rear driving required power.
CN202010661423.3A 2020-07-10 2020-07-10 Electric automobile electric drive control method applied to assembling double battery packs Pending CN111823882A (en)

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