CN113253117A - Estimation method and estimation device for residual SOE value - Google Patents

Estimation method and estimation device for residual SOE value Download PDF

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CN113253117A
CN113253117A CN202110591901.2A CN202110591901A CN113253117A CN 113253117 A CN113253117 A CN 113253117A CN 202110591901 A CN202110591901 A CN 202110591901A CN 113253117 A CN113253117 A CN 113253117A
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energy
battery system
value
soc
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CN113253117B (en
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张传龙
金源
戴平平
张路路
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Yadea Technology Group Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
    • 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]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The embodiment of the invention discloses a method and a device for estimating a residual SOE value, which are applied to a battery system of a two-wheeled electric vehicle, wherein the estimation method comprises the following steps: according to the standing time of the system, determining the current real SOC value of the battery system by using an open-circuit voltage correction SOC method; determining the current available energy according to the current real SOC value based on the relation between the rated energy and the preset parameter; the preset parameters comprise an SOC value, temperature and a current road condition; calculating the energy loss of the battery system when the battery system operates to the current time; estimating a remaining SOE value of the battery system according to the current available energy and the loss energy; wherein the remaining SOE value is an energy percentage of a remaining energy of the battery system to a current available energy. According to the technical scheme provided by the embodiment of the invention, the current available energy is determined according to the current real SOC value and by considering multiple factors of temperature and road conditions, and the residual SOE value of the battery system is estimated according to the current available energy and the loss energy, so that the accuracy of the residual SOE value of the battery system is improved, and the problem of customer complaints is reduced.

Description

Estimation method and estimation device for residual SOE value
Technical Field
The embodiment of the invention relates to the technical field of energy estimation of electric vehicles, in particular to a method and a device for estimating a residual SOE value.
Background
The estimation of the residual SOE value of the electric vehicle is always a very concerned problem in the industry, and accurate energy estimation can ensure accurate calculation of the endurance mileage.
Because of the hardware strength and cost of the two-wheeled vehicle, the Battery Management System (BMS) of the two-wheeled vehicle cannot have powerful intelligent self-learning or powerful model introduction estimation capability like the BMS of the electric vehicle, which makes it difficult to estimate the remaining SOE value of the Battery System of the two-wheeled vehicle compared to the electric vehicle. In the prior art, the estimation of the residual available energy of the two-wheeled vehicle is to use the calibrated rated energy as the only estimation reference at the initial development stage and then estimate the energy according to a simple percentage mode, so that the energy deviation is large, and the problem of large customer complaint is caused.
Disclosure of Invention
The embodiment of the invention provides a method and a device for estimating a residual SOE value, which are used for improving the accuracy of the residual SOE value and reducing the problem of customer complaints.
In a first aspect, an embodiment of the present invention provides a method for estimating a remaining SOE value, applied to a battery system of a two-wheeled electric vehicle, including:
according to the standing time of the system, determining the current real SOC value of the battery system by using an open-circuit voltage correction SOC method;
determining the current available energy according to the current real SOC value based on the relation between the rated energy and the preset parameter; the preset parameters comprise an SOC value, a temperature and a current road condition;
calculating the loss energy of the battery system running to the current time;
estimating a remaining SOE value of the battery system based on the currently available energy and the dissipated energy; wherein the remaining SOE value is an energy percentage of a remaining energy of the battery system to a current available energy.
Optionally, the determining the current true SOC value of the battery system by using the open-circuit voltage correction SOC method according to the system standing time includes:
judging whether the standing time of the system meets a preset duration range or not; if so, acquiring the lowest single cell voltage in the battery system and the temperature of the battery system;
and under the condition that the two-wheeled electric vehicle does not run after the battery system is started, correcting the current real SOC value according to the temperature of the system and the lowest single cell voltage based on the preset relation among the temperature of the system, the lowest single cell voltage and the SOC value.
Optionally, the determining a current true SOC value of the battery system by using an open-circuit voltage correction SOC method according to the system standing time includes:
judging whether the standing time of the system meets a preset duration range or not; if so, acquiring the lowest single cell voltage in the battery system and the temperature of the battery system;
under the condition that the two-wheeled electric vehicle runs after the battery system is started, correcting the initial SOC value of the current running according to the temperature of the system and the lowest single cell voltage based on the preset relation among the temperature of the system, the lowest single cell voltage and the SOC value, wherein the initial SOC value is the real SOC value of the system;
and calculating the current SOC value according to the corrected initial SOC value and the running time.
Optionally, the current SOC value is calculated according to the initial SOC value and the current time of operation, and is determined based on the following:
Figure BDA0003089891320000031
therein, SOCrealIs an initial SOC value; the SOC is the current residual SOC value of the battery system after operation; i is current; c0Measuring the calibrated available capacity under the current condition; SOH is the life value of the battery system.
Optionally, the determining the current available energy according to the current true SOC value based on the relationship between the rated energy and the preset parameter includes:
detecting the throttle depth of the two-wheel vehicle, and determining the current road condition of the two-wheel vehicle according to the detected throttle depth;
calling a corresponding prestored rated energy relation table according to the current road condition of the two-wheel vehicle; the rated energy relation table comprises the relation between the rated energy of the battery system and the temperature and SOC value of the battery system;
determining the current rated energy according to the temperature of the battery system and the current real SOC value;
and determining the current available energy according to the current rated energy and the service life value of the battery system.
Optionally, the determining the current road condition of the two-wheel vehicle according to the detected accelerator depth includes:
after the throttle depth is detected, counting a plurality of throttle depth frequency sets detected within preset time; each throttle depth frequency set comprises a plurality of throttle depths detected according to preset data acquisition frequency;
determining a throttle depth frequency set with the maximum occurrence frequency within preset time;
determining the current road condition of the two-wheel vehicle according to the accelerator depth frequency set with the largest occurrence frequency; and the accelerator depth frequency set corresponds to the current road condition of the two-wheel vehicle one to one.
Optionally, determining the current available energy according to the current rated energy and the life value of the battery system is based on the following determination:
Qcan be used＝QRated value*SOH；
Wherein Q isCan be usedIs the current available energy; qRated valueRated energy under the current condition; SOH is the life value of the battery system.
Optionally, the energy loss of the battery system when the battery system operates to the current time is calculated, and the determination is based on the following:
Figure BDA0003089891320000041
wherein Q istThe energy loss of the battery system from the current time to the operation; i is current; t is time; and V is the voltage of the battery system at the current moment.
Optionally, the estimating a remaining SOE value of the battery system according to the currently available energy and the dissipated energy is based on the following determination:
Figure BDA0003089891320000042
wherein the SOE is a remaining SOE value of the battery system; qCan be usedIs the current available energy; qtTo lose energy; SOH is the life value of the battery system.
In a second aspect, an embodiment of the present invention provides an apparatus for estimating a remaining SOE value, configured to perform the method for estimating a remaining SOE value according to the first aspect, where the method includes:
the SOC value acquisition module is used for determining the current real SOC value of the battery system by utilizing an open-circuit voltage correction SOC method according to the standing time of the system;
the current available energy obtaining module is used for determining current available energy according to the current SOC value based on the relation between the rated energy and the preset parameter; the preset parameters comprise an SOC value, a temperature and a current road condition;
the calculation module is used for calculating the loss energy of the battery system running to the current time;
a residual SOE value estimation module for estimating a residual SOE value of the battery system according to the current available energy and the loss energy; wherein the remaining SOE value is an energy percentage of a remaining energy of the battery system to a current available energy.
The embodiment of the invention provides a method and a device for estimating a residual SOE value, which are applied to a battery system of a two-wheeled electric vehicle, wherein the estimation method comprises the following steps: according to the standing time of the system, determining the current real SOC value of the battery system by using an open-circuit voltage correction SOC method; determining the current available energy according to the current SOC value based on the relation between the rated energy and a preset parameter; the preset parameters comprise an SOC value, temperature and a current road condition; calculating the energy loss of the battery system when the battery system operates to the current time; estimating a remaining SOE value of the battery system according to the current available energy and the loss energy; wherein the remaining SOE value is an energy percentage of a remaining energy of the battery system to a current available energy. The technical scheme provided by the embodiment of the invention determines the current real SOC value of the battery system by using an open-circuit voltage correction SOC method according to the standing time of the system; determining the current available energy according to the current SOC value based on the relation between the rated energy and preset parameters, wherein the preset parameters comprise the SOC value, the temperature and the current road condition; therefore, the current available energy is determined according to the current real SOC value and by considering multiple factors such as temperature, road conditions and the like, so that the residual SOE value of the battery system is estimated according to the current available energy and the loss energy, the accuracy of the residual SOE value of the battery system can be improved, and the problem of customer complaints is reduced.
Drawings
FIG. 1 is a flow chart of a method for estimating a residual SOE value according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for estimating a remaining SOE value according to an embodiment of the present invention;
fig. 3 is a block diagram of an apparatus for estimating a remaining SOE value according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a method for estimating a residual SOE value, which is applied to a battery system of a two-wheeled electric vehicle, and FIG. 1 is a flow chart of the method for estimating the residual SOE value provided by the embodiment of the invention, and referring to FIG. 1, the method comprises the following steps:
and S110, determining the current real SOC value of the battery system by using an open-circuit voltage correction SOC method according to the system standing time.
Specifically, accurate driving range prediction is a key issue in electric vehicle applications. The battery system is used as a power source Of the electric vehicle, generally, the capacity is measured by a State Of Charge (SOC), and the residual energy is calculated by an integral Of a product Of the SOC and a terminal voltage, so that the driving range Of the whole vehicle is predicted. The remaining SOE value in the embodiment of the present invention is an energy percentage of the remaining energy of the battery system to the currently available energy. The factors influencing the estimation of the driving range of the electric vehicle are more, and the difficulty of estimating the residual SOE value is that the numerator and the denominator of the SOE value cannot be determined according to different driving intentions of drivers in the running process of the whole vehicle, namely the residual energy and the current available energy cannot be determined. Therefore, to obtain an accurate residual SOE value, an accurate residual energy and a current available energy are determined. The first step in the embodiments of the present invention is to estimate the current true SOC value. And when the power supply is started, the BMS firstly reads the standing time of the system and determines the current SOC value according to the standing time of the system. It should be noted that, if the two-wheeled electric vehicle does not operate after the battery system is started, the current SOC value is the initial SOC value of the current operation; if the two-wheeled electric vehicle runs for a period of time after the battery system is started, the current SOC value is the residual SOC value of the two-wheeled electric vehicle running to the current moment.
Optionally, when the two-wheeled electric vehicle is not operated after the battery system is started, determining a current true SOC value of the battery system by using an open-circuit voltage correction SOC method according to the system standing time:
judging whether the standing time of the system meets a preset duration range or not; if so, acquiring the lowest single cell voltage in the battery system and the temperature of the battery system;
and under the condition that the two-wheeled electric vehicle does not run after the battery system is started, correcting the current real SOC value according to the temperature of the system and the lowest single cell voltage based on the preset relation among the temperature of the system, the lowest single cell voltage and the SOC value.
Specifically, when power-on starts, the BMS reads the standing time of the system first, and if the standing time reaches a preset time range, for example, 1h to 2h, the BMS reads the current lowest cell voltage in the battery system and determines the temperature of the battery system; and correcting the current SOC value according to the temperature of the system and the lowest single cell voltage based on the preset relation among the temperature of the system, the lowest single cell voltage and the SOC value. The preset relationship among the temperature of the system, the lowest cell voltage and the SOC value can be calibrated according to tests at the initial development stage. The preset relationship between the temperature of the system, the lowest cell voltage and the SOC value may be pre-stored in an SOC-OCV relationship table. Table 1 is an exemplary SOC-OCV relationship table provided in an embodiment of the present invention. And in the SOC-OCV relation table, a preset relation among the temperature of the system, the lowest single battery cell voltage and the SOC value is stored.
TABLE 1 SOC-OCV relationship Table
Figure BDA0003089891320000071
And if the standing time reaches the preset time range, the BMS calls a pre-stored SOC-OCV table, and determines a corresponding SOC value in the SOC-OCV table according to the read current lowest single cell voltage in the battery system and the determined temperature of the battery system. And the corresponding SOC value in the SOC-OCV table is the corrected current SOC value. And the SOC-OCV meter is calibrated in the initial development stage according to the test, and static single voltage values at different temperatures and different SOCs are detected, so that the relationship among the temperature, the SOC value and the single voltage value of the battery system is obtained. If the standing time does not meet the requirement and is smaller than the preset range, the SOC value stored by the EEPROM is dominant after the current SOC value is powered off for the last time. An eeprom (electrically Erasable Programmable read only memory) refers to a charged Erasable Programmable read only memory, and is a memory chip with no data loss after power failure.
Optionally, when the two-wheeled electric vehicle runs after the battery system is started, determining a current true SOC value of the battery system by using an open-circuit voltage correction SOC method according to the system standing time, including:
judging whether the standing time of the system meets a preset duration range or not; if so, acquiring the lowest single cell voltage in the battery system and the temperature of the battery system;
correcting the initial SOC value of the current operation according to the temperature of the system and the lowest single cell voltage based on the preset relation among the temperature of the system, the lowest single cell voltage and the SOC value;
and calculating the current SOC value according to the corrected initial SOC value and the running time.
Specifically, the power-on starts, the BMS reads the last standing time of the system, and if the standing time reaches a preset time range, the BMS acquires the lowest cell voltage among the voltage values of the cell and the battery temperature. And the BMS calls a pre-stored SOC-OCV table, and determines a corresponding SOC value in the SOC-OCV table according to the read lowest single cell voltage in the battery system and the determined temperature of the battery system. And the corresponding SOC value in the SOC-OCV table is the corrected initial SOC value of the current operation. And calculating the current SOC value according to the corrected initial SOC value and the running time. If the standing time does not meet the requirement and is smaller than the preset range, the initial SOC value is mainly the SOC value stored in the EEROM after the power is turned off for the last time. Wherein the current SOC value is calculated from the initial SOC value and the time of operation to the current, which may be determined based on the following formula:
Figure BDA0003089891320000091
therein, SOCrealIs an initial SOC value; the SOC is the current residual SOC value of the battery system after operation; i is current; c0Rated capacity calibrated for measurement; soh (state Of health) is a life value Of the battery system. SOH is used to indicate the capacity, health and performance status of the battery, i.e. the percentage of the full charge capacity of the battery to the rated capacity, the percentage of the battery which is newly shipped out is 100%, the percentage of the battery which is completely scrapped is 0%, and the percentage of the battery which is generally used in electric bicycles is 70%.
S120, determining the current available energy according to the current SOC value based on the relation between the rated energy and a preset parameter; the preset parameters comprise an SOC value, a temperature and a current road condition.
Specifically, the second step in the embodiment of the present invention is to determine the currently available energy. Determining the current available energy includes: determining the current available energy according to the current SOC value based on the relation between the rated energy and a preset parameter; the preset parameters comprise an SOC value, a temperature and a current road condition. The relationship between the setpoint energy and the setpoint variable can likewise be calibrated in the early development phase on the basis of testing. And measuring rated energy according to the measured different temperatures, different SOCs and different road conditions, thereby determining the relationship between the rated energy and the preset parameters. The relationship between the rated energy and the preset parameter may be prestored in a rated energy relationship table. Table 2 is a rated energy relationship table exemplarily provided in the embodiment of the present invention, and the table is rated energy measured at different temperatures, different SOC values, and different road conditions. The road conditions can be urban road conditions, suburban road conditions, road conditions with rotten roads and the like.
The road condition of the two-wheel vehicle is input in the early stage of development, and the concrete realization idea is as follows:
urban road conditions: the road condition is multiple traffic lights, the two-wheel vehicle stops when walking, and the depth of the accelerator is from a deep accelerator to a shallow accelerator regularly along with the limitation of the red lights;
suburban road conditions: on the road, the traffic flow and the pedestrian flow are relatively small, the two-wheel vehicle can run at the highest speed for a long time, and the accelerator depth is kept at the highest state for a long time;
road conditions with rotten roads: the two-wheeled vehicle is not suitable for high-speed running due to the fact that the road is hollow, the throttle depth basically and always fluctuates at the position 1/2, and occasionally the maximum depth occurs.
The BMS calls the rated energy relation table, obtains the temperature of the current battery system and determines the current road condition, and the current rated energy can be correspondingly determined according to the current SOC value, so that the current available energy can be determined according to the current rated energy and the service life of the battery system. It should be noted that, if the vehicle is not in motion, the nominal energy relationship table represents the nominal energy measured at different temperatures and different SOCs. E1 and E2 … … E in the tablenNamely the rated energy.
TABLE 2 nominal energy relationship table
Figure BDA0003089891320000101
And S130, calculating the energy loss of the battery system when the battery system runs to the current time.
Specifically, the third step in the embodiment of the present invention is to determine the energy loss at the current time. Optionally, the energy loss of the battery system when the battery system operates to the current time is calculated, and the determination is based on the following:
Figure BDA0003089891320000102
wherein Q istThe energy loss of the battery system from the current time to the operation; i is current; t is time; and V is the voltage of the battery system at the current moment. The energy is calculated according to the formula Q-V C, and after the vehicle runs, the current SOC value of the battery system is based on the formula
Figure BDA0003089891320000103
Determining, so at time t
Figure BDA0003089891320000104
t ' is any time point within t, when the BMS reads the voltage V ' again at t ', then at t
Figure BDA0003089891320000105
Calculating the loss energy of t time according to an integral formula
Figure BDA0003089891320000106
That is, the energy loss of the battery system to the current time is calculated based on the formula
Figure BDA0003089891320000107
And (4) determining.
S140, estimating a residual SOE value of the battery system according to the current available energy and the loss energy; wherein the remaining SOE value is an energy percentage of a remaining energy of the battery system to a current available energy.
Specifically, the remaining energy of the battery system may be calculated according to a difference between the current available energy and the loss energy; and estimating the residual SOE value according to the energy percentage of the residual energy of the battery system and the current available energy. Estimating a remaining SOE value of the battery system from a current available energy and a dissipated energy, based on the determination of:
Figure BDA0003089891320000111
wherein, SOE is the residual SOE value of the battery system; qCan be usedIs the current available energy; qtTo lose energy; SOH is the life value of the battery system.
The method for estimating the residual SOE value provided by the embodiment of the invention is applied to a battery system of a two-wheeled electric vehicle, and comprises the following steps: according to the standing time of the system, determining the current real SOC value of the battery system by using an open-circuit voltage correction SOC method; determining the current available energy according to the current SOC value based on the relation between the rated energy and a preset parameter; the preset parameters comprise an SOC value, temperature and road conditions; calculating the energy loss of the battery system when the battery system operates to the current time; estimating a remaining SOE value of the battery system according to the current available energy and the loss energy; wherein the remaining SOE value is an energy percentage of a remaining energy of the battery system to a current available energy. The technical scheme provided by the embodiment of the invention determines the current real SOC value according to the standing time of the system; determining the current available energy according to the current SOC value based on the relation between the rated energy and preset parameters, wherein the preset parameters comprise the SOC value, the temperature and the road condition; therefore, the current available energy is determined according to the current real SOC value and by considering multiple factors such as temperature, road conditions and the like, so that the residual SOE value of the battery system is estimated according to the current available energy and the loss energy, the accuracy of the residual SOE value of the battery system can be improved, and the problem of customer complaints is reduced.
Fig. 2 is a flowchart of another method for estimating a remaining SOE value according to an embodiment of the present invention, and referring to fig. 2, the method includes:
and S210, determining the current real SOC value of the battery system by using an open-circuit voltage correction SOC method according to the system standing time.
S220, detecting the accelerator depth of the two-wheel vehicle, and determining the current road condition of the two-wheel vehicle according to the detected accelerator depth.
Specifically, different road conditions exist after the vehicle runs, and the called rated energy relation table is different under different road conditions. The rated energy relation table comprises two types of tables, wherein the first type of table is rated energy Q measured at different temperatures and different SOC01The second type of table is the rated energy Q measured under different temperatures, different SOC and different road conditions02The road conditions can be urban road conditions, suburban road conditions, road conditions with rotten roads, and the like. The data are obtained by testing under the same conditions, namely the conditions such as voltage window, test current and the like need to be consistent.
Optionally, determining the current road condition of the two-wheel vehicle according to the detected throttle depth includes:
after the throttle depth is detected, counting a plurality of throttle depth frequency sets detected within preset time; each throttle depth frequency set comprises a plurality of throttle depths detected according to preset data acquisition frequency;
determining a throttle depth frequency set with the maximum occurrence frequency within preset time;
determining the current road condition of the two-wheel vehicle according to the accelerator depth frequency set with the largest occurrence frequency; and the accelerator depth frequency set corresponds to the current road condition of the two-wheel vehicle one to one.
Specifically, under different road conditions, the times and depths of using the accelerator by the driver are different, for example, under urban road conditions, the driver can frequently use the accelerator, brake to drive and avoid. When the accelerator depth is detected, a plurality of accelerator depth frequency sets K in preset time are counted, wherein each accelerator depth frequency set K is an accelerator depth frequency set with different temperatures, different road conditions and different SOC discharging. A category of throttle depth frequency set K represents a road condition. And determining the accelerator depth frequency set K of the category with the largest occurrence frequency within the preset time, and determining the road condition of the current vehicle. Each accelerator depth frequency set K comprises a plurality of accelerator depths detected according to preset data acquisition frequency, and the time length of each accelerator depth frequency set K is the same, namely the number of the accelerator depths acquired in each accelerator depth frequency set K is the same. The values of the plurality of throttle depths of each throttle depth frequency set K may vary within a preset variation range. However, in the set K of throttle depth frequencies of different classes, the throttle depths that appear most frequently are different. It can be understood that: counting a plurality of throttle depth frequencies detected in unit time t, wherein the throttle depth frequencies are variable frequency values, each throttle depth frequency comprises a plurality of throttle depths theta, and the throttle depths theta can be different values. And each unit time t corresponds to an accelerator depth frequency set K, the counter 1 counts the occurrence frequency and frequency of different types of K when the K counter of each type appears, and if the occurrence frequency and frequency of the K of a certain type are many (such as the frequency of a deep accelerator all the time), the current road condition of the whole vehicle at the moment is reversely deduced according to the K.
S230, calling a corresponding pre-stored rated energy relation table according to the road condition of the two-wheel vehicle; the rated energy relation table comprises the relation between the rated energy of the battery system and the temperature and SOC value of the battery system.
Specifically, the throttle depth of the two-wheel vehicle is detected, the road condition of the two-wheel vehicle is determined according to the throttle depth, and a corresponding pre-stored rated energy relation table is called according to the road condition of the two-wheel vehicle. The rated energy relation table comprises the relation among the rated energy of the battery system, the temperature and the SOC value of the battery system and the road condition of the two-wheel vehicle.
S240, determining the current rated energy according to the temperature of the battery system and the current SOC value; and determining the current available energy according to the current rated energy and the service life value of the battery system.
Specifically, a corresponding pre-stored rated energy relation table is called according to the road condition of the two-wheel vehicle, and the rated energy of the battery system under the current temperature and the current SOC value is reversely deduced. The rated energy cannot be used as an estimated determination, and the energy Q available in the current situation (current SOC value, current temperature, current road condition)Can be used＝QRated value*SOH。QRated valueIs corresponding to E in Table 21～En-1zhA value of (1). Under the condition that the accelerator depth is not detected, determining rated energy Q in a rated energy relation table according to the temperature and the current SOC value01At this time QRated value＝Q01I.e. QCan be used＝Q01SOH. When the accelerator depth is detected and the road condition is determined, determining the rated energy Q in the rated energy relation table according to the temperature, the current SOC value and the road condition02At this time, Q is compared01And Q02If Q is greater than or equal to01＞Q02Rated energy being selected from Q02I.e. QCan be used＝Q02SOH; if Q is01Is equal to Q02Rated energy Q selection02I.e. QCan be used＝Q02SOH; if Q is01＜Q02Rated energy Q selection01I.e. QCan be used＝Q01SOH. Wherein Q01＜Q02Or Q01＝Q02This occurs because the vehicle charges the battery during operation, i.e. when the battery is charged more than the battery is discharged, Q may occur01＜Q02Or Q01＝Q02The case (1). It should be noted that, the available energy is determined by selecting a smaller rated energy, which can prevent energy overestimation and avoid the occurrence of the situation that the vehicle cannot be ridden actually due to the energy value displayed by the meter.
And S250, calculating the energy loss of the battery system when the battery system runs to the current time.
S260, estimating a residual SOE value of the battery system according to the current available energy and the loss energy; wherein the remaining SOE value is an energy percentage of a remaining energy of the battery system to a current available energy.
The technical scheme provided by the embodiment of the invention determines the current real SOC value by using an open-circuit voltage correction SOC method according to the standing time of the system; detecting the throttle depth of the two-wheel vehicle, and determining the current road condition of the two-wheel vehicle according to the detected throttle depth; calling a corresponding prestored rated energy relation table according to the road condition of the two-wheel vehicle; the rated energy relation table comprises the relation between the rated energy of the battery system and the temperature and SOC value of the battery system; determining the current rated energy according to the temperature of the battery system and the current SOC value; and determining the current available energy according to the current rated energy and the service life value of the battery system. The accurate current available energy can be determined according to the current real SOC value and by considering multiple factors such as temperature, road conditions and the like, so that the residual SOE value of the battery system can be estimated according to the current available energy and the loss energy, the accuracy of the residual SOE value of the battery system is improved, and the problem of customer complaints is reduced.
An embodiment of the present invention further provides an estimation apparatus of a remaining SOE value, configured to execute the estimation method of the remaining SOE value according to any of the above embodiments, and fig. 3 is a block diagram of the estimation apparatus of the remaining SOE value according to the embodiment of the present invention, and referring to fig. 3, the estimation apparatus includes:
an SOC value obtaining module 10, configured to determine a current actual SOC value by using an open-circuit voltage correction SOC method according to the time when the system is standing;
a current available energy obtaining module 20, configured to determine current available energy according to a current real SOC value based on a relationship between a rated energy and a preset parameter; the preset parameters comprise an SOC value, a temperature and a current road condition;
a loss energy calculation module 30, configured to calculate a loss energy of the battery system until the current time;
a residual SOE value estimation module 40 for estimating a residual SOE value of the battery system based on the current available energy and the loss energy; wherein the remaining SOE value is an energy percentage of a remaining energy of the battery system to a current available energy.
Specifically, the estimation device of the remaining SOE value includes an SOC value acquisition module 10, a currently available energy acquisition module 20, a loss energy calculation module 30, and a remaining SOE value estimation module 40. The SOC value obtaining module 10 is configured to determine a current SOC value according to the time for the system to stand. Under the condition that the two-wheeled electric vehicle does not run after the battery system is started, the SOC value acquisition module judges whether the standing time of the system meets a preset duration range or not; if so, acquiring the lowest single cell voltage in the battery system and the temperature of the battery system; and under the condition that the two-wheeled electric vehicle does not run after the battery system is started, correcting the current SOC value according to the temperature of the system and the lowest single cell voltage based on the preset relation between the temperature of the system, the lowest single cell voltage and the SOC value. Under the condition that the two-wheeled electric vehicle runs after the battery system is started, the SOC value acquisition module judges whether the standing time of the system meets a preset time length range; if so, acquiring the lowest single cell voltage in the battery system and the temperature of the battery system; correcting the initial SOC value of the current operation according to the temperature of the system and the lowest single cell voltage based on the preset relation among the temperature of the system, the lowest single cell voltage and the SOC value; and calculating the current SOC value according to the corrected initial SOC value and the running time.
The current available energy obtaining module 20 is configured to determine current available energy according to a current SOC value based on a relationship between rated energy and a preset parameter; the preset parameters include SOC value, temperature and road condition. The relationship between the setpoint energy and the setpoint variable can likewise be calibrated in the early development phase on the basis of testing. And measuring rated energy according to the national standard under different temperatures, different SOC and different road conditions, thereby determining the relation between the rated energy and the preset parameters. The relationship between the rated energy and the preset parameter may be prestored in a rated energy relationship table. The road conditions can be urban road conditions, rotten road conditions, cement road conditions, asphalt road conditions and the like. It should be noted that, if the vehicle is not in motion, the nominal energy relationship table represents the nominal energy measured at different temperatures and different SOCs. After the current SOC value is determined, the current available energy obtaining module calls a rated energy relation table, obtains the temperature of the current battery system and determines the current road condition, the current rated energy can be correspondingly determined according to the current SOC value, and further the current available energy can be determined according to the current rated energy and the service life value of the battery system.
The energy loss calculation module 30 is used for calculating the energy loss of the battery system from the current time to the operation, and calculating the energy loss of the battery system from the current time to the operation based on the formula
Figure BDA0003089891320000161
And (4) determining. Wherein Q istThe energy loss of the battery system from the current time to the operation; i is current; t is time; and V is the voltage of the battery system at the current moment. The residual SOE value estimation module 40 is used for estimating a residual SOE value of the battery system according to the current available energy and the loss energy; wherein the remaining SOE value is an energy percentage of a remaining energy of the battery system to a current available energy. Estimating a remaining SOE value of the battery system based on a current available energy and a loss energy based on a formula
Figure BDA0003089891320000162
And (4) determining. Wherein, SOE is the residual SOE value of the battery system; qCan be usedIs the current available energy; qtTo lose energy; SOH is the life value of the battery system.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A method for estimating a remaining SOE value, which is applied to a battery system of a two-wheeled electric vehicle, includes:
according to the standing time of the system, determining the current real SOC value of the battery system by using an open-circuit voltage correction SOC method;
determining the current available energy according to the current real SOC value based on the relation between the rated energy and the preset parameter; the preset parameters comprise an SOC value, a temperature and a current road condition;
calculating the loss energy of the battery system running to the current time;
estimating a remaining SOE value of the battery system based on the currently available energy and the dissipated energy; wherein the remaining SOE value is an energy percentage of a remaining energy of the battery system to a current available energy.
2. The method of estimating a remaining SOE value according to claim 1, wherein the determining a current true SOC value of the battery system using an open-circuit voltage correction SOC method according to a system rest time comprises:
judging whether the standing time of the system meets a preset duration range or not; if so, acquiring the lowest single cell voltage in the battery system and the temperature of the battery system;
and under the condition that the two-wheeled electric vehicle does not run after the battery system is started, correcting the current real SOC value according to the temperature of the system and the lowest single cell voltage based on the preset relation among the temperature of the system, the lowest single cell voltage and the SOC value.
3. The method of estimating a remaining SOE value according to claim 1, wherein said determining a current true SOC value of the battery system using an open-circuit voltage corrected SOC method according to a system rest time comprises:
judging whether the standing time of the system meets a preset duration range or not; if so, acquiring the lowest single cell voltage in the battery system and the temperature of the battery system;
under the condition that the two-wheel electric vehicle runs after the battery system is started, correcting the initial SOC value of the current running according to the temperature of the system and the lowest single cell voltage based on the preset relation among the temperature of the system, the lowest single cell voltage and the SOC value; the corrected initial SOC value is the real SOC value of the system;
and calculating the current SOC value according to the corrected initial SOC value and the running time.
4. The method of estimating a remaining SOE value according to claim 3, wherein said calculating a current SOC value from an initial SOC value and a time of operation to current is based on the following determination:
Figure FDA0003089891310000021
therein, SOCrealIs an initial SOC value; the SOC is the current remaining real SOC value of the battery system after operation; i is current; c0Measuring the calibrated available capacity under the current condition; SOH is the life value of the battery system.
5. The method of estimating a residual SOE value according to claim 1, wherein said determining a current available energy from a current true SOC value based on a relationship between a rated energy and a preset parameter comprises:
detecting the throttle depth of the two-wheel vehicle, and determining the current road condition of the two-wheel vehicle according to the detected throttle depth;
calling a corresponding prestored rated energy relation table according to the current road condition of the two-wheel vehicle; the rated energy relation table comprises the relation between the rated energy of the battery system and the temperature and SOC value of the battery system;
determining the current rated energy according to the temperature of the battery system and the current real SOC value;
and determining the current available energy according to the current rated energy and the service life value of the battery system.
6. The method of estimating a remaining SOE value according to claim 5, wherein said determining a current road condition of said two-wheeled vehicle based on a detected throttle depth comprises:
after the throttle depth is detected, counting a plurality of throttle depth frequency sets detected within preset time; each throttle depth frequency set comprises a plurality of throttle depths detected according to preset data acquisition frequency;
determining a throttle depth frequency set with the maximum occurrence frequency within preset time;
determining the current road condition of the two-wheel vehicle according to the accelerator depth frequency set with the largest occurrence frequency; and the accelerator depth frequency set corresponds to the road condition of the two-wheel vehicle one to one.
7. Method for estimating a residual SOE value according to claim 5, characterized in that the determination of said currently available energy from the current nominal energy and the life value of the battery system is based on the following determinations:
Qcan be used＝QRated value*SOH；
Wherein Q isCan be usedIs the current available energy; qRated valueThe current rated energy is used; SOH is the life value of the battery system.
8. The method of estimating a residual SOE value according to claim 1, wherein said calculating a loss energy of said battery system operating to a current time is based on the determination of:
Figure FDA0003089891310000031
wherein Q istThe energy loss of the battery system from the current time to the operation; i is current; t is time; and V is the voltage of the battery system at the current moment.
9. The method of estimating a residual SOE value according to claim 8, wherein said estimating a residual SOE value of said battery system based on said currently available energy and said dissipated energy is based on determining:
Figure FDA0003089891310000032
wherein the SOE is a remaining SOE value of the battery system; qCan be usedIs the current available energy; qtTo lose energy; SOH is the life value of the battery system.
10. An apparatus for estimating a residual SOE value, characterized by performing the residual SOE value estimation method according to any one of claims 1 to 9, comprising:
the SOC value acquisition module is used for determining the current real SOC value by utilizing an open-circuit voltage correction SOC method according to the standing time of the system;
the current available energy obtaining module is used for determining current available energy according to the current real SOC value based on the relation between rated energy and preset parameters; the preset parameters comprise an SOC value, a temperature and a current road condition;
the calculation module is used for calculating the loss energy of the battery system running to the current time;
a residual SOE value estimation module for estimating a residual SOE value of the battery system according to the current available energy and the loss energy; wherein the remaining SOE value is an energy percentage of a remaining energy of the battery system to a current available energy.
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