CN115123018B

CN115123018B - Pure electric mode torque limiting control method and device for vehicle, electronic equipment and medium

Info

Publication number: CN115123018B
Application number: CN202210876132.5A
Authority: CN
Inventors: 姚蒙蒙; 时艳茹; 张佳骥; 张芳; 郭姗姗
Original assignee: Weichai Power Co Ltd; Weifang Weichai Power Technology Co Ltd
Current assignee: Weichai Power Co Ltd; Weifang Weichai Power Technology Co Ltd
Priority date: 2022-07-25
Filing date: 2022-07-25
Publication date: 2024-06-18
Anticipated expiration: 2042-07-25
Also published as: CN115123018A

Abstract

The application discloses a pure electric mode torque limiting control method, a device, electronic equipment and a medium of a vehicle, which relate to the technical field of automobile electronics and are used for determining a target intervention current value based on a target voltage threshold value and voltage comparison information when the condition that the single voltage characteristic information drops to the target voltage threshold value in preset voltage comparison information is monitored by acquiring battery characteristic information comprising single voltage characteristic information; the voltage comparison information comprises a voltage threshold value and an intervention current value corresponding to the voltage threshold value; the voltage threshold is higher than the fault threshold of the whole vehicle for torque limiting control; the target voltage threshold is one of the voltage threshold satisfying the characteristic information that the numerical value is larger than the single voltage; the target intervention current value is an intervention current value which is selected from the intervention current values included in the voltage comparison information and corresponds to the target voltage threshold value; based on the target intervention current value, a limit current value of a battery pack of the vehicle is adjusted. The method can improve the stability of torque limiting control.

Description

Pure electric mode torque limiting control method and device for vehicle, electronic equipment and medium

Technical Field

The application relates to the technical field of automobile electronics, in particular to a pure electric mode torque limiting control method and device for a vehicle, electronic equipment and a medium.

Background

In the running process of the pure electric vehicle or the pure electric mode vehicle, when the consistency of a power system and the system level are poor, continuous high-current impact can lead the battery core with the worst performance in the system to reach the fault threshold value of the whole vehicle for limiting torsion in advance.

The existing method is subjected to double limitation of the whole vehicle control unit VCU and the battery management system BMS, the actual output capacity of the battery pack can be greatly reduced, meanwhile, for continuous high-speed or heavy-load driving behaviors, frequent severe current changes not only can reduce the power output of the battery pack, but also can cause running of the whole vehicle, the use safety of the power battery pack is affected, poor driving experience can be caused, abnormal running of the vehicle is easily caused, and therefore, the stability of torque limiting control of the pure electric vehicle or the pure electric vehicle is low in the running process.

Disclosure of Invention

The embodiment of the application provides a pure electric mode torque limiting control method, device, electronic equipment and medium of a vehicle, which can control the limiting current value of a battery pack of the vehicle according to the determined target intervention current value based on the battery characteristic information of the battery pack in the vehicle, so as to perform advanced active current limiting intervention on the vehicle and improve the stability of torque limiting control.

In a first aspect, an embodiment of the present application provides a method for controlling pure electric mode torque limiter of a vehicle, where the method includes:

Acquiring battery characteristic information of a battery pack in a vehicle; the battery characteristic information comprises single voltage characteristic information;

If the single voltage characteristic information is monitored to be reduced to a target voltage threshold value in preset voltage comparison information, determining a target intervention current value based on the target voltage threshold value and the voltage comparison information; wherein the voltage control information comprises a voltage threshold value and an intervention current value corresponding to the voltage threshold value; the voltage threshold is higher than a fault threshold of the whole vehicle for torque limiting control; the target voltage threshold is one of the voltage thresholds which meets the condition that the numerical value is larger than the single voltage characteristic information; the target intervention current value is an intervention current value which is selected from intervention current values included in the voltage control information and corresponds to the target voltage threshold;

And adjusting a limiting current value of a battery pack of the vehicle based on the target intervention current value.

According to the method, through obtaining battery characteristic information comprising single voltage characteristic information, when the single voltage characteristic information is monitored to be reduced to a target voltage threshold value in preset voltage comparison information, a target intervention current value is determined based on the target voltage threshold value and the voltage comparison information; wherein the voltage control information comprises a voltage threshold value and an intervention current value corresponding to the voltage threshold value; the voltage threshold is higher than a fault threshold of the whole vehicle for torque limiting control; the target voltage threshold is one of the voltage thresholds which meets the condition that the numerical value is larger than the single voltage characteristic information; the target intervention current value is an intervention current value which is selected from intervention current values included in the voltage control information and corresponds to the target voltage threshold; based on a target intervention current value, a limit current value of a battery pack of the vehicle is adjusted. According to the method, based on the monitored battery characteristic information comprising the single voltage characteristic information, when the single voltage characteristic information is monitored to be reduced to a target voltage threshold value in preset voltage comparison information, the limiting current value of the battery pack of the vehicle is controlled according to the determined target intervention current value, so that the pure electric vehicle or the pure electric mode vehicle is subjected to advanced active current limiting intervention, abnormal vehicle operation is reduced, and stability of torque limiting control is improved.

In one possible implementation, the cell voltage characteristic information is a lowest cell voltage; the acquiring battery characteristic information of a battery pack in a vehicle includes:

Acquiring battery data of each single cell of a battery pack in a vehicle;

and obtaining the lowest cell voltage of each cell according to the battery data.

According to the method, the single voltage characteristic information is the lowest single voltage, each single cell of the battery pack can be controlled more accurately, the early active current limiting intervention is carried out on the vehicle before the fault threshold of the whole vehicle for torque limiting control is reached, abnormal running of the vehicle can be reduced, and the stability of torque limiting control is improved.

In one possible implementation, the battery characteristic information further includes a reference intervention current value, the reference intervention current value being determined based on an intervention current value of a battery pack at a previous time or an intervention current value of a battery pack at an initial time;

the adjusting a limiting current value of a battery pack of the vehicle based on the target intervention current value includes:

and reducing the limiting current value of the battery pack of the vehicle from the reference intervention current value to the target intervention current value according to a preset current reduction rate based on the target intervention current value.

The method further comprises a reference intervention current value, wherein the reference intervention current value is determined based on the intervention current value of the battery pack at the previous moment or the intervention current value of the battery pack at the initial moment; the limiting current value of the battery pack of the vehicle may be reduced from the reference intervention current value to the target intervention current value at a preset down-flow rate based on the target intervention current value. According to the method, in the process of adjusting the limiting current value of the battery pack of the vehicle based on the target intervention current value, the limiting current value of the battery pack of the vehicle is reduced to the target intervention current value from the reference intervention current value according to the preset current reduction rate, active linear current reduction is achieved, large fluctuation of current and running of the whole vehicle are avoided, abnormal running of the vehicle can be reduced, stability of torque limiting control is improved, and driving safety of the pure electric vehicle is improved.

In one possible implementation, the battery characteristic information further includes a battery output current; the down flow rate comprises a first down flow rate and a second down flow rate; the first downflow rate is greater than the second downflow rate;

the limiting current value of the battery pack of the vehicle is reduced from the reference intervention current value to the target intervention current value according to a preset current reduction rate based on the target intervention current value, and the limiting current value comprises:

And if the battery output current is smaller than the target intervention current value, reducing the limit current value of the battery pack of the vehicle from the reference intervention current value to the target intervention current value according to a preset first current reduction rate based on the target intervention current value.

According to the method, the power shortage state of the battery pack can be identified by determining that the battery output current is smaller than the target intervention current value, and then the rapid current reduction is carried out at the first current reduction rate. According to the method, when the output current of the battery is smaller than the target intervention current value, the more efficient real-time limiting value effect on the battery pack current can be achieved, the whole vehicle running caused by large jump cannot be caused, abnormal running of the vehicle can be reduced, the stability of torque limiting control is improved, and the running safety of the pure electric vehicle is improved.

In one possible implementation, the method further includes:

If the battery output current is greater than or equal to the target intervention current value, reducing the limiting current value of the battery pack of the vehicle from the reference intervention current value to the battery output current according to a preset first current reduction rate;

And reducing the limit current value of the battery pack of the vehicle to the target intervention current value by the battery output current according to a preset second current reduction rate based on the target intervention current value.

The method is characterized in that if the battery output current is greater than or equal to the target intervention current value, the method is executed: reducing a limiting current value of a battery pack of the vehicle from the reference intervention current value to the battery output current according to a preset first current reduction rate; and reducing the limit current value of the battery pack of the vehicle to the target intervention current value by the battery output current according to a preset second current reduction rate based on the target intervention current value. According to the method, under the condition that the battery output current is larger than or equal to the target intervention current value, the limiting current value is rapidly reduced at a first current reduction rate, then the limiting current value is switched to a second current reduction rate to slowly reduce the limiting current value when the limiting current value reaches the battery output current, gradual linear transition of the limiting current value based on the battery output current is realized, vehicle running caused by excessively fast switching of the limiting current is reduced, abnormal vehicle running can be reduced, stability of torque limiting control is improved, and driving safety of a pure electric mode of a vehicle is improved.

In one possible implementation manner, the monitoring that the cell voltage characteristic information drops to a target voltage threshold in preset voltage comparison information includes:

selecting at least one voltage threshold to be selected, wherein the value of the voltage threshold is greater than or equal to that of the single voltage characteristic information;

Taking the voltage threshold with the smallest value in the at least one voltage threshold to be selected as the target voltage threshold;

if the single voltage characteristic information at the previous moment is larger than the target voltage threshold and the single voltage characteristic information at the current moment is smaller than or equal to the target voltage threshold, judging that the single voltage characteristic information is monitored to be reduced to the target voltage threshold in the preset voltage comparison information.

Selecting at least one voltage threshold to be selected, wherein the voltage threshold satisfies the voltage value of the voltage threshold and is larger than the single voltage characteristic information; taking the voltage threshold with the smallest value in the at least one voltage threshold to be selected as the target voltage threshold; if the single voltage characteristic information at the previous moment is larger than the target voltage threshold and the single voltage characteristic information at the current moment is smaller than or equal to the target voltage threshold, judging that the single voltage characteristic information is monitored to be reduced to the target voltage threshold in the preset voltage comparison information. The method efficiently and accurately monitors the fact that the single voltage characteristic information is reduced to the target voltage threshold value in the preset voltage comparison information, so that the target intervention current value can be rapidly determined, the torque limiting control of the pure electric mode of the vehicle is performed according to the target intervention current value, the method is simple and easy to implement, the calculated amount of the torque limiting control of the pure electric mode of the vehicle is reduced, the vehicle can be effectively subjected to advanced active current limiting intervention, abnormal vehicle operation is reduced, and the stability of the torque limiting control is improved.

In one possible implementation manner, the acquiring battery characteristic information of a battery pack in a vehicle includes:

If the target fault is not detected, acquiring battery characteristic information of a battery pack in the vehicle; and the target fault represents that a voltage acquisition fault exists or a communication fault exists when the battery characteristic information is acquired.

The method comprises the steps of monitoring whether a target fault occurs or not, and acquiring battery characteristic information of a battery pack in a vehicle when the target fault does not occur; and the target fault represents that a voltage acquisition fault exists or a communication fault exists when the battery characteristic information is acquired. The method can ensure that reliable battery characteristic information is acquired, can more effectively perform advanced active current limiting intervention on the vehicle, reduces abnormal vehicle operation, and improves stability of torque limiting control.

In a second aspect, an embodiment of the present application provides a pure electric mode torque limiter control apparatus for a vehicle, including:

A battery information acquisition unit configured to acquire battery characteristic information of a battery pack in a vehicle; the battery characteristic information comprises single voltage characteristic information;

An intervention current determining unit, configured to determine a target intervention current value based on a target voltage threshold and voltage control information if it is monitored that the single voltage characteristic information falls to the target voltage threshold in preset voltage control information; wherein the voltage control information comprises a voltage threshold value and an intervention current value corresponding to the voltage threshold value; the voltage threshold is higher than a fault threshold of the whole vehicle for torque limiting control; the target voltage threshold is one of the voltage thresholds which meets the condition that the numerical value is larger than the single voltage characteristic information; the target intervention current value is an intervention current value which is selected from intervention current values included in the voltage control information and corresponds to the target voltage threshold;

And a limit current adjustment unit configured to adjust a limit current value of a battery pack of the vehicle based on the target intervention current value.

In one possible implementation, the cell voltage characteristic information is a lowest cell voltage; the battery information acquisition unit is specifically configured to:

Acquiring battery data of each single cell of a battery pack in a vehicle;

the limit current adjusting unit is specifically configured to:

In one possible implementation manner, the limit current adjustment unit is further configured to:

In one possible implementation, the intervention current determination unit is specifically configured to:

In one possible implementation manner, the battery information obtaining unit is specifically configured to:

In a third aspect, there is provided an electronic device comprising a processor and a memory, wherein the memory stores program code that, when executed by the processor, causes the processor to perform the steps of the pure mode torque limit control method of the vehicle of any one of the above.

In a fourth aspect, a computer-readable storage medium is provided, in which a computer program is stored, which when executed by a processor, implements the pure electric mode torque limiter control method of the vehicle of any one of the above.

The technical effects caused by any implementation manner of the second aspect to the fourth aspect may be referred to the technical effects caused by the implementation manner of the first aspect, and are not described herein.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic flow chart of a pure electric mode torque limiting control method for a vehicle according to an embodiment of the present application;

Fig. 2 is a schematic flow chart of another method for controlling pure electric mode torque limiter of a vehicle according to an embodiment of the present application;

Fig. 3 is a schematic structural diagram of a pure electric mode torque limiting control device for a vehicle according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Some terms in the embodiments of the present application are explained below to facilitate understanding by those skilled in the art.

(1) VCU: (Vehicle Control Unit ): the VCU is also called as a whole vehicle controller, and is a core control component of the whole vehicle, and the VCU collects signals of an accelerator pedal, a brake pedal and other components and controls the action of each component controller at the lower layer to drive the vehicle to normally run after corresponding judgment is made.

(2) Load: the load is the ratio of the actual torque of the engine at operating speed to the maximum torque, i.e., the ratio of the torque emitted under a partial throttle to the maximum torque emitted when the throttle is fully open at a particular engine speed.

(3) SOC (State of charge): SOC is used to reflect the remaining capacity of a battery and is defined numerically as the ratio of the remaining capacity to the battery capacity, commonly expressed as a percentage. The value range is 0-1, and the battery is completely discharged when soc=0 and completely full when soc=1. The specific value of the battery SOC is related to parameters such as battery terminal voltage, charge-discharge current, internal resistance and the like.

(4) BMS (BatteryManagement System ): a Battery Management System (BMS) is an important tie connecting an on-vehicle power battery and an electric car. The BMS collects, processes and stores important information in the running process of the battery pack in real time, exchanges information with external equipment such as a VCU (vehicle control unit), and solves key problems of safety, usability, service life and the like in a battery system. The main function is to improve the utilization ratio of the battery, prevent the battery from overcharge and overdischarge, prolong the service life of the battery and monitor the state of the battery.

In order to reduce abnormal vehicle operation in a pure electric mode of a vehicle or in an operation process of a pure electric vehicle and improve stability of torque limiting control, the embodiment of the application provides a pure electric mode torque limiting control method, device, electronic equipment and medium of the vehicle. In order to better understand the technical scheme provided by the embodiment of the application, the basic principle of the scheme is briefly described here.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above 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 application described herein may be implemented in sequences other than those illustrated or otherwise described herein. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.

The following describes the technical scheme provided by the embodiment of the application with reference to the accompanying drawings.

The conventional method is subjected to double limitation of the whole vehicle control unit VCU and the battery management system BMS, so that the actual output capacity of the battery pack is greatly reduced, meanwhile, for continuous high-speed or heavy-load driving behaviors, frequent severe current changes not only can reduce the power output of the battery pack, but also can cause running of the whole vehicle, thus not only affecting the use safety of the power battery pack, but also causing poor driving experience and easily causing abnormal vehicle operation, and therefore, the stability of torque limiting control is lower.

In view of the above, the embodiments of the present application provide a pure electric mode torque limiting control method, apparatus, electronic device, and medium for a vehicle, by acquiring battery characteristic information including single voltage characteristic information, when it is monitored that the single voltage characteristic information falls to a target voltage threshold in preset voltage comparison information, determining a target intervention current value based on the target voltage threshold and the voltage comparison information; the voltage comparison information comprises a voltage threshold value and an intervention current value corresponding to the voltage threshold value; the voltage threshold is higher than the fault threshold of the whole vehicle for torque limiting control; the target voltage threshold is one of the voltage threshold satisfying the characteristic information that the numerical value is larger than the single voltage; the target intervention current value is an intervention current value which is selected from the intervention current values included in the voltage comparison information and corresponds to the target voltage threshold value; based on the target intervention current value, a limit current value of a battery pack of the vehicle is adjusted. According to the method, based on the monitored battery characteristic information comprising the single voltage characteristic information, when the single voltage characteristic information is monitored to be reduced to a target voltage threshold value in preset voltage comparison information, the limiting current value of the battery pack of the vehicle is controlled according to the determined target intervention current value, so that the vehicle is subjected to active current limiting intervention in advance, abnormal operation of the vehicle is reduced, and the stability of torque limiting control is improved.

The preferred embodiments of the present application will be described below with reference to the accompanying drawings of the specification, it being understood that the preferred embodiments described herein are for illustration and explanation only, and not for limitation of the present application, and embodiments of the present application and features of the embodiments may be combined with each other without conflict.

The pure electric mode torque limiting control method of the vehicle provided by the embodiment of the application is further explained below. As shown in fig. 1, the method comprises the following steps:

step S101, battery characteristic information of a battery pack in a vehicle is obtained; the battery characteristic information includes cell voltage characteristic information.

In practice, the BMS may acquire battery characteristic information of a battery pack in the vehicle in real time. The battery characteristic information may include cell voltage characteristic information. The cell voltage characteristic information refers to voltage characteristic information corresponding to a cell of the battery pack, such as a minimum cell voltage. It will be appreciated that in embodiments of the application, the battery characteristic information may also include other information than cell voltage characteristic information.

Illustratively, battery characteristic information cell_feature_data of a battery pack in a vehicle is acquired; the battery characteristic information cell_feature_data includes Cell voltage characteristic information cell_s_v.

In one possible implementation, the cell voltage characteristic information is the lowest cell voltage; the battery characteristic information of the battery pack in the vehicle is acquired, and the method can be realized by the following steps:

and step A01, acquiring battery data of each single cell of a battery pack in the vehicle.

Illustratively, assuming that the battery pack includes 3 individual cells, battery Data cell_data_1 of the 3 individual cells of the battery pack in the vehicle is acquired at a time.

And step A02, obtaining the lowest cell voltage of each cell according to the battery data.

Illustratively, assuming that the cell voltages of the 3 cell units are 2.6V, 3.2V, and 3.1V, respectively, based on the battery Data cell_data_1 of the 3 cell units of the battery pack in the vehicle, the minimum cell voltages of the 3 cell units are 2.6V, 3.2V, and 3.1V, that is, 2.6V, respectively, can be obtained.

In one possible implementation manner, battery characteristic information of a battery pack in a vehicle is acquired, specifically: if the target fault is not detected, acquiring battery characteristic information of a battery pack in the vehicle; the target fault represents that a voltage acquisition fault exists or a communication fault exists when battery characteristic information is acquired.

In the embodiment of the application, whether the voltage acquisition fault or the communication fault exists or not can be diagnosed in real time. If the target fault is monitored, battery characteristic information of a battery pack in the vehicle is not acquired, and the torque limiting adjustment process of the pure electric mode torque limiting control method of the vehicle provided by the embodiment of the application is not carried out. And when the target fault is not monitored, acquiring battery characteristic information of a battery pack in the vehicle, wherein the target fault represents that the voltage acquisition fault exists or the communication fault exists when the battery characteristic information is acquired.

Step S102, if it is monitored that the single voltage characteristic information is reduced to a target voltage threshold value in preset voltage comparison information, determining a target intervention current value based on the target voltage threshold value and the voltage comparison information.

The voltage comparison information comprises a voltage threshold value and an intervention current value corresponding to the voltage threshold value; the voltage threshold is higher than the fault threshold of the whole vehicle for torque limiting control; the target voltage threshold is one of the voltage threshold satisfying the characteristic information that the numerical value is larger than the single voltage; the target intervention current value is an intervention current value corresponding to the target voltage threshold value selected from the intervention current values included in the voltage control information.

In the embodiment of the application, the voltage comparison information is a key value pair consisting of a voltage threshold value and an intervention current value, and the voltage threshold value is higher than a fault threshold value for controlling torsion limitation of the whole vehicle. If the BMS monitors that the single voltage characteristic information is reduced to a target voltage threshold value in the preset voltage comparison information, the intervention current value corresponding to the target voltage threshold value is selected from the intervention current values included in the voltage comparison information based on the target voltage threshold value and the voltage comparison information, and the intervention current value is used as a target intervention current value.

For example, the voltage comparison information may be a correspondence table as shown in table 1, assuming that the fault threshold of the battery pack is 2.0V, taking Cell voltage characteristic information cell_s_v as an example of the lowest Cell voltage V _{cell_min}, when it is monitored that the lowest Cell voltage V _{cell_min} drops to a target voltage threshold value of 2.8V in the preset voltage comparison information, the target intervention current value may be determined to be 150mA based on the target voltage threshold value of 2.8V and the correspondence relationship of the preset voltage threshold value and the intervention current value as shown in table 1.

TABLE 1

Voltage threshold (V)	Intervention current value (mA)
		3	200
2.8	150
		2.5	110

Note that the voltage control information shown in table 1 contains 3 voltage thresholds, which is merely an example. In the embodiment of the present application, the number of voltage thresholds included in the voltage control information may be one or more. The number of voltage thresholds included in the voltage control information is not particularly limited in the present application.

In one possible implementation manner, the monitoring that the cell voltage characteristic information drops to the target voltage threshold in the preset voltage comparison information may be achieved by the following steps:

And B01, selecting at least one voltage threshold to be selected, wherein the value of the voltage threshold is greater than or equal to that of the single voltage characteristic information.

For example, taking the example that the characteristic information of the cell voltage is the lowest cell voltage V _{cell_min}, assuming that the lowest cell voltage V _{cell_min} at the time T _i is 2.79V, at least one candidate voltage threshold with a value greater than 2.79V is selected from the voltage thresholds of the voltage comparison information in table 1, that is, 3V and 2.8V can be obtained.

And step B02, taking the minimum value of at least one candidate voltage threshold as a target voltage threshold.

Illustratively, the obtained candidate voltage thresholds are 3V and 2.8V, and the candidate voltage threshold with the smallest value in the obtained candidate voltage thresholds is 2.8V, which is taken as the target voltage threshold.

And B03, judging that the detected single voltage characteristic information is reduced to the target voltage threshold in the preset voltage comparison information if the single voltage characteristic information at the previous moment is larger than the target voltage threshold and the single voltage characteristic information at the current moment is smaller than or equal to the target voltage threshold.

For example, assuming that the time T _i-1 is the time immediately before the time T _i, the lowest cell voltage V _{cell_min} at the time T _i-1 is 2.82V, it is satisfied that the cell voltage characteristic information greater than the previous time is greater than the target voltage threshold value by 2.8V, and the cell voltage characteristic information at the time T _i is less than or equal to the target voltage threshold value by 2.8V, it is determined that the cell voltage characteristic information is monitored to drop to the target voltage threshold value in the preset voltage control information by 2.8V.

Step S103, adjusting a limit current value of a battery pack of the vehicle based on the target intervention current value.

In the embodiment of the application, the BMS uses the single voltage characteristic information in the battery characteristic information as an index criterion, compares and judges the single voltage characteristic information with a preset voltage threshold, and when the single voltage characteristic information is lower than the voltage threshold, satisfies an advanced current limiting condition and performs advanced active current limiting intervention. For example, the cell voltage characteristic information may be the lowest cell voltage.

In one possible implementation, the battery characteristic information further includes a reference intervention current value, the reference intervention current value being determined based on an intervention current value of the battery pack at a previous time or an intervention current value of the battery pack at an initial time; the adjusting of the limiting current value of the battery pack of the vehicle based on the target intervention current value may be based on the target intervention current value, reducing the limiting current value of the battery pack of the vehicle from the reference intervention current value to the target intervention current value at a preset reduction rate.

In particular implementations, the battery characteristic information further includes a reference intervention current value, wherein the reference intervention current value may be an intervention current value based on a battery pack at a previous time. If the current time is the initial running of the vehicle and there is no intervention current value of the battery pack at the previous time, the BMS can acquire the intervention current value of the battery pack at the initial time determined by the battery management system. In some embodiments of the present application, the BMS employs an active linear down-flow method, specifically, reduces a limit current value of a battery pack of the vehicle from a reference intervention current value to a target intervention current value according to a preset down-flow rate based on the target intervention current value.

In one possible implementation, the battery characteristic information further includes a battery output current; the down flow rate comprises a first down flow rate and a second down flow rate; the first downflow rate is greater than the second downflow rate; based on the target intervention current value, reducing the limiting current value of the battery pack of the vehicle to the target intervention current value from the reference intervention current value according to a preset current reduction rate, wherein the limiting current value is specifically: and if the battery output current is smaller than the target intervention current value, reducing the limit current value of the battery pack of the vehicle from the reference intervention current value to the target intervention current value according to the preset first current reduction rate based on the target intervention current value.

Illustratively, assume that the target intervention current value is I _lim,k and the reference intervention current value is I _lim,k-1. The battery characteristic information cell_feature_data further includes a battery output current I _k; the down flow rate comprises a first down flow rate alpha and a second down flow rate beta; the first downflow rate alpha is greater than the second downflow rate beta; reducing the limiting current value of the battery pack of the vehicle from the reference intervention current value I _lim,k-1 to a target intervention current value I _lim,k according to a preset current reduction rate based on the target intervention current value, specifically: if the battery output current I _k is less than the target intervention current value I _lim,k, the limiting current value α of the battery pack of the vehicle is reduced from the reference intervention current value I _lim,k-1 to the target intervention current value I _lim,k at a preset first current reduction rate based on the target intervention current value I _lim,k.

In one possible implementation manner, during the pure electric mode torque limiting control of the vehicle, if the battery output current is greater than or equal to the target intervention current value, the limiting current value of the battery pack of the vehicle is reduced to the target intervention current value by the reference intervention current value according to the preset flow-down rate based on the target intervention current value, which can be achieved by:

and step C01, reducing the limiting current value of the battery pack of the vehicle to the battery output current from the reference intervention current value according to the preset first current reduction rate.

For example, if the battery output current I _k is equal to or greater than the target intervention current value I _lim,k, the limiting current value of the battery pack of the vehicle is first reduced from the reference intervention current value I _lim,k -1 to the battery output current I _k at the preset first reduction rate α.

And step C02, based on the target intervention current value, reducing the limit current value of the battery pack of the vehicle according to a preset second current reduction rate, and reducing the battery output current to the target intervention current value.

Illustratively, after the limiting current value of the battery pack of the vehicle is reduced from the reference intervention current value I _lim,k -1 to the battery output current I _k, the limiting current value of the battery pack of the vehicle is reduced from the battery output current I _k to the target intervention current value I _lim,k at the preset second current reduction rate β based on the target intervention current value I _lim,k.

According to the pure electric mode torque limiting control method of the vehicle shown in fig. 1, through obtaining battery characteristic information comprising single voltage characteristic information, when the single voltage characteristic information is monitored to be reduced to a target voltage threshold value in preset voltage comparison information, a target intervention current value is determined based on the target voltage threshold value and the voltage comparison information; the voltage comparison information comprises a voltage threshold value and an intervention current value corresponding to the voltage threshold value; the voltage threshold is higher than the fault threshold of the whole vehicle for torque limiting control; the target voltage threshold is one of the voltage threshold satisfying the characteristic information that the numerical value is larger than the single voltage; the target intervention current value is an intervention current value which is selected from the intervention current values included in the voltage comparison information and corresponds to the target voltage threshold value; based on the target intervention current value, a limit current value of a battery pack of the vehicle is adjusted. According to the method, based on the monitored battery characteristic information comprising the single voltage characteristic information, when the single voltage characteristic information is monitored to be reduced to a target voltage threshold value in preset voltage comparison information, the limiting current value of the battery pack of the vehicle is controlled according to the determined target intervention current value, so that the vehicle is subjected to active current limiting intervention in advance, abnormal operation of the vehicle is reduced, and the stability of torque limiting control is improved.

The following describes another pure electric mode torque limiting control method for a vehicle provided by the embodiment of the application. The pure electric mode torque limiting control method of the vehicle, as shown in fig. 2, comprises the following steps:

Step S201, monitoring whether a target fault occurs; the target fault represents that a voltage acquisition fault exists or a communication fault exists when battery characteristic information is acquired. If the monitoring result is no, step S202 is executed. If the monitoring result is yes, step S209 is executed.

Step S202, battery characteristic information of a battery pack in a vehicle is obtained; the battery characteristic information includes cell voltage characteristic information, a reference intervention current value, and a battery output current.

Wherein the reference intervention current value is determined based on the intervention current value of the battery pack at the previous time or the intervention current value of the battery pack at the initial time.

Step S203, determining whether it is monitored that the cell voltage characteristic information falls to the target voltage threshold in the preset voltage comparison information. If yes, go to step S204. If not, go to step S209

Step S204, determining a target intervention current value based on the target voltage threshold value and the voltage comparison information.

Step S205, determining whether the battery output current is less than the target intervention current value. If yes, go to step S206; if not, steps S207 and S208 are performed.

Step S206, based on the target intervention current value, reducing the limit current value of the battery pack of the vehicle to the target intervention current value from the reference intervention current value according to the preset first descending current rate.

Step S207, reducing the limit current value of the battery pack of the vehicle from the reference intervention current value to the battery output current according to the preset first current reduction rate.

In the case of a specific implementation of the method,

Step S208, based on the target intervention current value, limiting current value of a battery pack of the vehicle is reduced to the target intervention current value according to a preset second down-flow rate, and the battery output current is reduced to the target intervention current value.

Step S209, the vehicle is kept at the limit current value before the vehicle.

The process of the pure mode torque limiter control of the vehicle in steps S201 to S209 may be performed with reference to the specific process of the foregoing embodiment, and the same points will not be described herein.

The pure electric mode torque limiting control method of the vehicle is simple and easy to implement, achieves the aim of pure electric mode torque limiting control of the vehicle through BMS program setting, optimizes pure electric mode torque limiting control of the vehicle, achieves gradual linear transition of a limiting value based on battery output current, reduces running of the vehicle caused by over-fast switching of the limiting value, can reduce abnormal running of the vehicle, improves stability of torque limiting control, and improves driving safety of the pure electric mode of the vehicle.

Based on the same inventive concept, the embodiment of the application also provides a pure electric mode torque limiting control device of the vehicle. As shown in fig. 3, the apparatus includes:

a battery information acquisition unit 301 for acquiring battery characteristic information of a battery pack in a vehicle; the battery characteristic information includes cell voltage characteristic information;

An intervention current determining unit 302, configured to determine a target intervention current value based on the target voltage threshold and the voltage comparison information if it is monitored that the single voltage characteristic information falls to the target voltage threshold in the preset voltage comparison information; the voltage comparison information comprises a voltage threshold value and an intervention current value corresponding to the voltage threshold value; the voltage threshold is higher than the fault threshold of the whole vehicle for torque limiting control; the target voltage threshold is one of the voltage threshold satisfying the characteristic information that the numerical value is larger than the single voltage; the target intervention current value is an intervention current value which is selected from the intervention current values included in the voltage comparison information and corresponds to the target voltage threshold value;

A limit current adjustment unit 303 for adjusting a limit current value of a battery pack of the vehicle based on the target intervention current value.

In one possible implementation, the cell voltage characteristic information is the lowest cell voltage; the battery information acquisition unit 301 specifically is configured to:

Acquiring battery data of each single cell of a battery pack in a vehicle;

In one possible implementation, the battery characteristic information further includes a reference intervention current value, the reference intervention current value being determined based on an intervention current value of the battery pack at a previous time or an intervention current value of the battery pack at an initial time;

the limiting current adjusting unit 303 is specifically configured to:

and if the battery output current is smaller than the target intervention current value, reducing the limit current value of the battery pack of the vehicle from the reference intervention current value to the target intervention current value according to the preset first current reduction rate based on the target intervention current value.

In a possible implementation, the limit current adjustment unit 303 is further configured to:

And reducing the limiting current value of the battery pack of the vehicle to the target intervention current value from the battery output current according to a preset second current reduction rate based on the target intervention current value.

In a possible implementation, the intervention current determination unit 302 is specifically configured to:

Taking the voltage threshold value to be selected with the minimum value in the at least one voltage threshold value to be selected as a target voltage threshold value;

In one possible implementation, the battery information obtaining unit 301 is specifically configured to:

If the target fault is not detected, acquiring battery characteristic information of a battery pack in the vehicle; the target fault represents that a voltage acquisition fault exists or a communication fault exists when battery characteristic information is acquired.

Based on the same technical concept, the embodiment of the present application further provides an electronic device, and referring to fig. 4, the electronic device is configured to implement the methods described in the above embodiments of the methods, for example, implement the method shown in fig. 1, where the electronic device may include a memory 401, a processor 402, an input unit 403, and a display panel 404.

A memory 401 for storing a computer program executed by the processor 402. The memory 401 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the electronic device, etc. The processor 402 may be a central processing unit (central processing unit, CPU), or a digital processing unit, etc. An input unit 403 may be used to obtain user instructions entered by a user. The display panel 404 is configured to display information input by a user or information provided to the user, and in the embodiment of the present application, the display panel 404 is mainly configured to display interfaces of applications in the terminal device and control entities displayed in the display interfaces. Alternatively, the display panel 404 may be configured in the form of a Liquid Crystal Display (LCD) CRYSTAL DISPLAY, an OLED (organic light-emitting diode), or the like.

The specific connection medium among the memory 401, the processor 402, the input unit 403, and the display panel 404 is not limited in the embodiment of the present application. In the embodiment of the present application, the memory 401, the processor 402, the input unit 403 and the display panel 404 are connected through the bus 405 in fig. 4, the bus 405 is shown by a thick line in fig. 4, and the connection manner between other components is only schematically illustrated, but not limited thereto. The bus 405 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 4, but not only one bus or one type of bus.

The memory 401 may be a volatile memory (RAM) such as a random-access memory (RAM); the memory 401 may also be a non-volatile memory (non-volatile memory), such as a read-only memory, a flash memory (flash memory), a hard disk (HARD DISK DRIVE, HDD) or a solid state disk (solid-STATE DRIVE, SSD), or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto. Memory 401 may be a combination of the above.

A processor 402 for invoking a computer program stored in the memory 401 to perform the method of the embodiment as shown in fig. 1.

The embodiment of the application also provides a computer readable storage medium which stores computer executable instructions required to be executed by the processor and contains a program for executing the processor.

In some possible embodiments, aspects of a method for controlling pure mode torque limit of a vehicle provided by the present application may also be implemented in the form of a program product, which includes program code for causing a terminal device to perform the steps of the method for controlling pure mode torque limit of a vehicle according to the various exemplary embodiments of the present application described above when the program product is run on the terminal device. For example, the electronic device may perform the embodiment shown in FIG. 2.

The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

A pure mode torque limiting control program product for a vehicle in accordance with embodiments of the application may employ a portable compact disc read only memory (CD-ROM) and include program code and may run on a computing device. However, the program product of the present application is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The readable signal medium may include a data signal propagated in baseband or as part of a carrier wave with readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an entity oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server. In the case of remote computing devices, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., connected via the Internet using an Internet service provider).

It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such a division is merely exemplary and not mandatory. Indeed, the features and functions of two or more of the elements described above may be embodied in one element in accordance with embodiments of the present application. Conversely, the features and functions of one unit described above may be further divided into a plurality of units to be embodied.

Furthermore, although the operations of the methods of the present application are depicted in the drawings in a particular order, this is not required or suggested that these operations must be performed in this particular order or that all of the illustrated operations must be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable file processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable file processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable file processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable file processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A pure electric mode torque limiting control method of a vehicle, characterized by comprising:

adjusting a limit current value of a battery pack of the vehicle based on the target intervention current value;

The battery characteristic information further includes a reference intervention current value, which is determined based on an intervention current value of a battery pack at a previous time or an intervention current value of a battery pack at an initial time;

Reducing a limiting current value of a battery pack of the vehicle from the reference intervention current value to the target intervention current value at a preset down-flow rate based on the target intervention current value;

The battery characteristic information also comprises battery output current; the down flow rate comprises a first down flow rate and a second down flow rate; the first downflow rate is greater than the second downflow rate;

2. The method of claim 1, wherein the cell voltage characteristic information is a lowest cell voltage; the acquiring battery characteristic information of a battery pack in a vehicle includes:

Acquiring battery data of each single cell of a battery pack in a vehicle;

3. The method according to claim 1, wherein the method further comprises:

4. A method according to any one of claims 1 to 3, wherein the monitoring that the cell voltage characteristic information falls to a target voltage threshold in preset voltage control information comprises:

5. A pure electric mode torque limiter control device of a vehicle, characterized by comprising:

A limit current adjustment unit configured to adjust a limit current value of a battery pack of the vehicle based on the target intervention current value;

the limit current adjusting unit is specifically configured to:

6. The apparatus of claim 5, wherein the cell voltage characteristic information is a lowest cell voltage; the battery information acquisition unit is specifically configured to:

Acquiring battery data of each single cell of a battery pack in a vehicle;

7. An electronic device comprising a processor and a memory, wherein the memory stores program code that, when executed by the processor, causes the processor to perform the steps of the method of any of claims 1-4.

8.A computer-readable storage medium having a computer program stored therein, characterized in that: the computer program, when executed by a processor, implements the method of any of claims 1-4.