CN113253117B - 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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Publication number
CN113253117B
CN113253117B CN202110591901.2A CN202110591901A CN113253117B CN 113253117 B CN113253117 B CN 113253117B CN 202110591901 A CN202110591901 A CN 202110591901A CN 113253117 B CN113253117 B CN 113253117B
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current
energy
battery system
value
soe
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CN113253117A (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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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 residual SOE value, which are applied to a battery system of a two-wheeled electric vehicle, wherein the method for estimating the residual SOE value comprises the following steps: according to the system standing time, determining the current real SOC value of the battery system by using an open-circuit voltage correction SOC method; determining 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 current road conditions; calculating the energy loss from the operation of the battery system to the current time; estimating a remaining SOE value of the battery system according to the current available energy and the loss energy; where the remaining SOE value is the energy percentage of the remaining energy of the battery system to the currently 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 the temperature and road condition multi-factor, 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 an estimation method and an estimation device of 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.
Due to the hardware strength and cost problems of the two-wheeled vehicle, the battery management system (Battery Management System, BMS) of the two-wheeled vehicle cannot achieve the same as the BMS of the electric vehicle, has strong intelligent self-learning or strong model import estimation capability, and therefore the residual SOE value of the battery system is difficult to estimate compared with the electric vehicle. In the prior art, the residual available energy estimation of the two-wheel vehicle takes the calibrated rated energy as a unique estimation reference in the early development stage, and then the estimation is carried out according to a simple percentage mode, so that the energy deviation is larger, and the problem of larger customer complaints 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 complaint problem.
In a first aspect, an embodiment of the present invention provides a method for estimating a residual SOE value, which is applied to a battery system of a two-wheeled electric vehicle, including:
according to the system standing time, determining the current real SOC value of the battery system by using an open-circuit voltage correction SOC method;
determining 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 current road conditions;
calculating the energy loss from the battery system to the current time;
estimating a remaining SOE value of the battery system based on the current available energy and the lost energy; wherein the remaining SOE value is an energy percentage of remaining energy of the battery system to currently available energy.
Optionally, the determining the current real SOC value of the battery system according to the system rest time by using an open circuit voltage correction SOC method includes:
judging whether the system standing time meets a preset duration range or not; if yes, 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 is not operated after the battery system is started, the current real SOC value is corrected according to the temperature of the system and the lowest single cell voltage based on the preset relation between the temperature of the system and the lowest single cell voltage and the SOC value.
Optionally, the determining the current real SOC value of the battery system according to the system rest time by using an open circuit voltage correction SOC method includes:
judging whether the system standing time meets a preset duration range or not; if yes, 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 an initial SOC value of the running according to the temperature of the system and the lowest single cell voltage based on a preset relation between the temperature of the system and the lowest single cell voltage and the SOC value, wherein the initial SOC value is a real SOC value of the system;
and calculating the current SOC value according to the corrected initial SOC value and the time from the operation to the current operation.
Optionally, the calculating the current SOC value according to the initial SOC value and the time until the current time is determined based on the following steps:
wherein SOC is real Is an initial SOC value; the SOC is the current residual SOC value of the battery system after operation; i is current; c (C) 0 For measuring the calibrated capacity available in the current situation; SOH is a life value of the battery system.
Optionally, the determining the current available energy according to the current real SOC value based on the relationship between the rated energy and the preset parameter includes:
detecting the throttle depth of the two-wheeled vehicle, and determining the current road condition of the two-wheeled vehicle according to the detected throttle depth;
the corresponding pre-stored rated energy relation table is called 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, the temperature of the battery system and the SOC value;
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 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 in preset time; each accelerator depth frequency set comprises a plurality of accelerator depths detected according to preset data acquisition frequency;
determining an accelerator depth frequency set with the largest occurrence number in a preset time;
determining the current road condition of the two-wheel vehicle according to the accelerator depth frequency set with the largest occurrence frequency; the accelerator depth frequency sets are in one-to-one correspondence with the current road conditions of the two-wheel vehicle.
Optionally, determining the current available energy from the current rated energy and a life value of the battery system is based on:
Q can be used ＝Q Rated for *SOH；
Wherein Q is Can be used Is the current available energy; q (Q) Rated for Rated energy under the current condition; SOH is a life value of the battery system.
Optionally, the calculating the lost energy of the battery system to the current time is determined based on:
wherein Q is t Energy is lost for the battery system at the current time of operation; i is current; t is time; v is the voltage at the current time of the battery system.
Optionally, the estimating the remaining SOE value of the battery system according to the current available energy and the lost energy is determined based on:
wherein the SOE is the remaining SOE value of the battery system; q (Q) Can be used Is the current available energy; q (Q) t To loss energy; SOH is a life value of the battery system.
In a second aspect, an embodiment of the present invention provides an estimation apparatus for a residual SOE value, configured to perform the method for estimating a residual SOE value described in the first aspect, including:
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 acquisition module is used for determining the 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, temperature and current road conditions;
the calculation module is used for calculating the loss energy of the battery system running to the current time;
a remaining SOE value estimation module configured to estimate 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 remaining energy of the battery system to currently available energy.
The embodiment of the invention provides an estimation method and an estimation device of 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 system standing time, determining the current real SOC value of the battery system by using an open-circuit voltage correction SOC method; 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, temperature and current road conditions; calculating the energy loss from the operation of the battery system to the current time; estimating a remaining SOE value of the battery system according to the current available energy and the loss energy; where the remaining SOE value is the energy percentage of the remaining energy of the battery system to the currently available energy. According to the technical scheme provided by the embodiment of the invention, the current real SOC value of the battery system is determined by using an open-circuit voltage correction SOC method according to the system standing time; determining current available energy according to a current SOC value based on a relation between the rated energy and preset parameters, wherein the preset parameters comprise the SOC value, the temperature and the current road condition; therefore, according to the current real SOC value, the current available energy is determined by combining 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 residual SOE values according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for estimating residual SOE values provided by an embodiment of the present invention;
fig. 3 is a block diagram of a device for estimating a residual SOE value according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
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 flowchart of the method for estimating the residual SOE value, and referring to fig. 1, the method comprises the following steps:
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.
In particular, accurate prediction of range is a key issue in electric vehicle applications. The battery system is used as a power source Of the electric vehicle, capacity is generally measured through State Of Charge (SOC), and residual energy is calculated through integration Of the product Of the SOC and terminal voltage, so that the prediction Of the driving range Of the whole vehicle is realized. The remaining SOE value in the embodiment of the present invention is the 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 in the estimation of the residual SOE value is that in the running process of the whole vehicle, the numerator and denominator of the SOE value cannot be determined according to different driving intentions of a driver, namely the residual energy and the current available energy cannot be determined. The exact remaining energy and the current available energy are determined in order to obtain an accurate remaining SOE value. The first step in the embodiment of the invention is to estimate the current real SOC value. At the beginning of power-on, the BMS firstly reads the time of system standing and determines the current SOC value according to the time of system standing. It should be noted that, if the two-wheel electric vehicle is not running after the battery system is started, the current SOC value is the initial SOC value of the current running; if the two-wheel electric car runs for a period of time after the battery system is started, the current SOC value is the residual SOC value from the running of the two-wheel car to the current moment.
Optionally, under the condition that the two-wheel electric vehicle is not operated after the battery system is started, 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:
judging whether the system standing time meets a preset duration range or not; if yes, 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 is not operated after the battery system is started, the current real SOC value is corrected according to the temperature of the system and the lowest single cell voltage based on the preset relation between the temperature of the system and the lowest single cell voltage and the SOC value.
Specifically, when power-on starts, the BMS firstly reads the standing time of the system, if the standing time reaches a preset time length range, for example, 1-2 h, the BMS reads the current lowest single cell voltage in the battery system, and determines the temperature of the battery system; based on the preset relation between the temperature of the system and the lowest cell voltage and the SOC value, the current SOC value is corrected according to the temperature of the system and the lowest cell voltage. The preset relation among the temperature of the system, the voltage of the lowest single battery cell and the SOC value can be calibrated according to the test in the early development stage. The preset relation between the temperature of the system, the lowest cell voltage and the SOC value can be pre-stored in an SOC-OCV relation table. Table 1 shows an SOC-OCV relationship table in accordance with an exemplary embodiment of the present invention. In the SOC-OCV relation table, a preset relation among the temperature of the system, the lowest cell voltage and the SOC value is stored.
TABLE 1 SOC-OCV relationship table
If the standing time reaches the preset duration 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. The corresponding SOC value in the SOC-OCV table is the corrected current SOC value. And (3) detecting static monomer voltage values at different temperatures and different SOCs according to test calibration in the initial development stage of the SOC-OCV table, so as to obtain the relationship among the temperature, the SOC value and the monomer voltage value of the battery system. If the standing time does not reach the requirement and is smaller than the preset range, the current SOC value is mainly the SOC value stored in the EEPROM after the last power-down. EEPROM (Electrically Erasable Programmable read only memory) is a charged erasable programmable read-only memory, which is a memory chip with no data loss after power failure.
Optionally, under the condition that the two-wheel electric car runs after the battery system is started, determining the current real SOC value of the battery system by using an open circuit voltage correction SOC method according to the system rest time includes:
judging whether the system standing time meets a preset duration range or not; if yes, acquiring the lowest single cell voltage in the battery system and the temperature of the battery system;
based on the preset relation between the temperature of the system and the voltage of the lowest single battery cell and the SOC value, correcting the initial SOC value of the current operation according to the temperature of the system and the voltage of the lowest single battery cell;
and calculating the current SOC value according to the corrected initial SOC value and the time from the operation to the current operation.
Specifically, when power-on starts, the BMS firstly reads the last standing time of the system, and if the standing time reaches a preset duration range, the BMS acquires the lowest single battery cell voltage in the voltage values of the single battery cells and the battery temperature. 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 cell voltage in the battery system and the determined temperature of the battery system. The corresponding SOC value in the SOC-OCV table is the initial SOC value of the current operation after correction. And calculating the current SOC value according to the corrected initial SOC value and the time from the operation to the current operation. If the standing time does not reach the requirement and is smaller than the preset range, the initial SOC value is mainly the SOC value stored in the EEROM after the last power-down. The current SOC value is calculated according to the initial SOC value and the time to run to the current time, and may be determined based on the following formula:
wherein SOC is real Is an initial SOC value; the SOC is the current residual SOC value of the battery system after operation; i is current; c (C) 0 For measuring the nominal capacity; SOH (State Of Health) is the life value of the battery system. SOH is used for representing the capacity, health degree and performance state of a storage battery, namely the percentage of the full charge capacity of the storage battery to the rated capacity, the newly-shipped battery is 100%, the total scrapping is 0%, and the electric two-wheel vehicle is generally used for 70%.
S120, 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, temperature and current road conditions.
Specifically, the second step in the embodiments of the present invention is to determine the current available energy. Determining the currently available energy includes: 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, temperature and current road conditions. The relationship between the rated energy and the preset parameter can be calibrated according to the test at the initial stage of development. And measuring rated energy according to the measured different temperatures, different SOCs and different road conditions, so as to determine the relation between the rated energy and preset parameters. The relationship between the nominal energy and the preset parameter may be pre-stored in a nominal energy relationship table. Table 2 is a table of rated energy relationships, which is an exemplary table of rated energy measured at different temperatures, different SOC values, and different road conditions. The road conditions can be classified into urban road conditions, suburban road conditions, rotten road conditions and the like.
The road condition of the two-wheel vehicle is input in the earlier stage of development, and the specific implementation thought is as follows:
urban road conditions: road conditions are multiple traffic lights, a two-wheel vehicle stops and walks, and the accelerator depth is changed from a deep accelerator to a shallow accelerator frequently along with the limitation of red lights;
suburban road conditions: the traffic flow and the people flow of the road are relatively low, the two-wheel vehicle can run at the highest speed for a long time, and the accelerator depth is maintained at the highest state for a long time;
road conditions of the rotten road: the road is hollow, the two-wheeled vehicle is not suitable for running at high speed, the accelerator depth basically fluctuates up and down at the 1/2 position all the time, and the maximum depth occasionally occurs.
The BMS calls a rated energy relation table, acquires the temperature of the current battery system and determines the current road condition, and can correspondingly determine the current rated energy according to the current SOC value, so that the current available energy can be determined according to the current rated energy and the life value of the battery system. If the vehicle is not started, the rated energy relationship table is a table of rated energy measured at different temperatures and different SOCs. E1, E2 … … E in the tables n I.e. the rated energy.
Table 2 rated energy relationship table
S130, calculating the energy loss of the battery system running 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 calculating the lost energy of the battery system to the current time is determined based on:
wherein Q is t Energy is lost for the battery system at the current time of operation; i is current; t is time; v is the voltage at the current time of the battery system. The energy is calculated according to the formula q=v×c, and after the vehicle is operated, the current SOC value of the battery system is based on the formulaConfirm, so t' moment +.>t ' is any point in time t, when the BMS again reads the voltage V ' at t ' and +.>Then the loss energy +.t. of the time t is calculated according to the integral formula>That is, the energy loss of the battery system to the current time is calculated based on the formula +.>And (5) determining.
S140, estimating the residual SOE value of the battery system according to the current available energy and the loss energy; where the remaining SOE value is the energy percentage of the remaining energy of the battery system to the currently available energy.
Specifically, the remaining energy of the battery system can be calculated according to the difference between the current available energy and the lost 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 the current available energy and the lost energy, based on:
the SOE is the residual SOE value of the battery system; q (Q) Can be used Is the current available energy; q (Q) t To loss energy; SOH is a 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 system standing time, determining the current real SOC value of the battery system by using an open-circuit voltage correction SOC method; 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, temperature and road conditions; calculating the energy loss from the operation of the battery system to the current time; estimating a remaining SOE value of the battery system according to the current available energy and the loss energy; where the remaining SOE value is the energy percentage of the remaining energy of the battery system to the currently available energy. According to the technical scheme provided by the embodiment of the invention, the current real SOC value is determined according to the standing time of the system; determining current available energy according to a current SOC value based on a relation between rated energy and preset parameters, wherein the preset parameters comprise the SOC value, temperature and road conditions; therefore, according to the current real SOC value, the current available energy is determined by combining 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 residual SOE value according to an embodiment of the present invention, and referring to fig. 2, the method includes:
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 throttle depth of the two-wheeled vehicle, and determining the current road condition of the two-wheeled vehicle according to the detected throttle depth.
Specifically, different road conditions exist after the vehicle runs, and the called rated energy relation table is different under the different road conditions. Rated forThe energy relation table comprises two types of tables, wherein the first type of table is the rated energy Q measured at different temperatures and different SOCs 01 The second type of table is the rated energy Q measured under different temperatures, different SOCs and different road conditions 02 The road conditions can be classified into urban road conditions, suburban road conditions, rotten road conditions and the like. The data needs to be obtained by testing under the same conditions, namely the conditions of 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 accelerator depth includes:
after the throttle depth is detected, counting a plurality of throttle depth frequency sets detected in preset time; each accelerator depth frequency set comprises a plurality of accelerator depths detected according to preset data acquisition frequency;
determining an accelerator depth frequency set with the largest occurrence number in a preset time;
determining the current road condition of the two-wheel vehicle according to the accelerator depth frequency set with the largest occurrence frequency; the accelerator depth frequency sets are in one-to-one correspondence with the current road conditions of the two-wheel vehicle.
Specifically, under different road conditions, the number of times and the depth of using the accelerator by the driver are different, for example, under urban road conditions, the driver can frequently use the accelerator, the brake to drive and avoid. After the accelerator depth is detected, counting a plurality of accelerator depth frequency sets K in a preset time, wherein each accelerator depth frequency set K is an accelerator depth frequency set discharged by different temperatures, different road conditions and different SOCs. One class of accelerator depth frequency sets K represents one road condition. And determining the class of accelerator depth frequency set K with the largest occurrence number in 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 duration 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 for each throttle depth frequency set K may vary within a preset variation range. However, in the accelerator depth frequency set K of different categories, accelerator depths that occur with a large probability are different. It can be understood that: and counting a plurality of detected accelerator depth frequencies in unit time t, wherein the accelerator depth frequencies are variable frequency values, each accelerator depth frequency comprises a plurality of accelerator depths theta, and the accelerator depths theta can be different values. Each unit time t corresponds to an accelerator depth frequency set K, each time a class K counter 1 appears, the number and frequency of occurrence of different classes K are counted, if the number and frequency of occurrence of K in a certain class are large (such as a deep accelerator frequency), the current road condition of the whole vehicle at the moment is reversely deduced according to K.
S230, according to road conditions of the two-wheel vehicle, a corresponding pre-stored rated energy relation table is fetched; the rated energy relation table includes the relation between the rated energy of the battery system and the temperature and SOC values of the battery system.
Specifically, the throttle depth of the two-wheeled vehicle is detected, the road condition of the two-wheeled 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-wheeled vehicle. The rated energy relation table comprises the relation between the rated energy of the battery system and the temperature, the SOC value and the road condition of the two-wheel vehicle of the battery system.
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 life value of the battery system.
Specifically, a corresponding pre-stored rated energy relation table is fetched 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 estimated energy cannot be used as the estimated determination value, and the energy Q is available under the current conditions (current SOC value, current temperature, current road conditions) Can be used ＝Q Rated for *SOH。Q Rated for For the corresponding E in Table 2 1 ～E n-1zh Is a value of (b). Determining rated energy Q in a rated energy relation table according to temperature and current SOC value under the condition that accelerator depth is not detected 01 At this time Q Rated for ＝Q 01 I.e. Q Can be used ＝Q 01 * SOH. When the throttle depth is detected and the road condition is determined, the rated energy in the rated energy relation table is determined according to the temperature, the current SOC value and the road conditionQ 02 At this time, compare Q 01 And Q is equal to 02 If Q is the size of 01 ＞Q 02 Rated energy is selected from Q 02 I.e. Q Can be used ＝Q 02 * SOH; if Q 01 Equal to Q 02 Rated energy Q 02 I.e. Q Can be used ＝Q 02 * SOH; if Q 01 ＜Q 02 Rated energy Q 01 I.e. Q Can be used ＝Q 01 * SOH. Wherein Q is 01 ＜Q 02 Or Q 01 ＝Q 02 The reason for this is that during operation of the vehicle, the battery is charged, i.e. when the charge of the battery is greater than the discharge of the battery, Q may occur 01 ＜Q 02 Or Q 01 ＝Q 02 Is the case in (a). It should be noted that, the available energy is determined by selecting smaller rated energy, which can prevent the energy from being overestimated, and avoid the situation that the instrument displays an energy value and the whole vehicle cannot actually ride.
S250, calculating the energy loss of the battery system running to the current time.
S260, estimating the residual SOE value of the battery system according to the current available energy and the loss energy; where the remaining SOE value is the energy percentage of the remaining energy of the battery system to the currently available energy.
According to the technical scheme provided by the embodiment of the invention, the current real SOC value is determined by utilizing 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; according to the road condition of the two-wheel vehicle, a corresponding pre-stored rated energy relation table is called; the rated energy relation table comprises the relation between rated energy of the battery system, the temperature of the battery system and the SOC value; determining the current rated energy according to the temperature of the battery system and the current SOC value; the current available energy is determined based on the current rated energy and a life value of the battery system. The accurate current available energy can be determined according to the current real SOC value and in combination with 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 is improved, and the problem of customer complaints is reduced.
The embodiment of the present invention further provides a device for estimating a residual SOE value, which is configured to execute the method for estimating a residual SOE value according to any of the foregoing embodiments, and fig. 3 is a block diagram of a structure of the device for estimating a residual SOE value according to the embodiment of the present invention, and referring to fig. 3, the device for estimating a residual SOE value includes:
the SOC value acquisition module 10 is used for determining a current real SOC value by utilizing an open circuit voltage correction SOC method according to the standing time of the system;
a currently available energy obtaining module 20, configured to determine a currently available energy according to a current real SOC value based on a relationship between the rated energy and a preset parameter; the preset parameters comprise an SOC value, temperature and current road conditions;
a lost energy calculation module 30 for calculating lost energy of the battery system to the current time;
a remaining SOE value estimating module 40 for estimating a remaining SOE value of the battery system based on the current available energy and the lost energy; where the remaining SOE value is the energy percentage of the remaining energy of the battery system to the currently available energy.
Specifically, the remaining SOE value estimation means includes an SOC value acquisition module 10, a currently available energy acquisition module 20, a lost energy calculation module 30, and a remaining SOE value estimation module 40. The SOC-value acquisition module 10 is configured to determine a current SOC value according to a time of system rest. Under the condition that the two-wheeled electric vehicle is not operated after the battery system is started, the SOC value acquisition module judges whether the system standing time meets a preset duration range; if yes, 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 is not operated after the battery system is started, the current SOC value is corrected according to the temperature of the system and the lowest single cell voltage based on the preset relation between the temperature of the system and 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 system standing time meets a preset duration range; if yes, acquiring the lowest single cell voltage in the battery system and the temperature of the battery system; based on the preset relation between the temperature of the system and the voltage of the lowest single battery cell and the SOC value, correcting the initial SOC value of the current operation according to the temperature of the system and the voltage of the lowest single battery cell; and calculating the current SOC value according to the corrected initial SOC value and the time from the operation to the current operation.
The currently available energy obtaining module 20 is configured to determine the currently available energy according to the current SOC value based on a relationship between the rated energy and the preset parameter; the preset parameters comprise an SOC value, temperature and road conditions. The relationship between the rated energy and the preset parameter can be calibrated according to the test at the initial stage of development. And measuring rated energy according to different temperatures, different SOCs and different road conditions measured by national standard, thereby determining the relation between the rated energy and preset parameters. The relationship between the nominal energy and the preset parameter may be pre-stored in a nominal energy relationship table. The road conditions can be classified into urban road conditions, rotten road conditions, cement road conditions, asphalt road conditions and the like. If the vehicle is not started, the rated energy relationship table is a table of rated energy measured at different temperatures and different SOCs. After the current SOC value is determined, the current available energy acquisition module calls a rated energy relation table, acquires the temperature of the current battery system, determines the current road condition, and can correspondingly determine the current rated energy according to the current SOC value, so that the current available energy can be further determined according to the current rated energy and the life value of the battery system.
The energy loss calculation module 30 is configured to calculate energy loss of the battery system to the current time, calculate the energy loss of the battery system to the current time, and based on a formulaAnd (5) determining. Wherein Q is t Energy is lost for the battery system at the current time of operation; i is current; t is time; v is the voltage at the current time of the battery system. The remaining SOE value estimation module 40 is configured to estimate a remaining SOE value of the battery system according to the current available energy and the loss energy; where the remaining SOE value is the energy percentage of the remaining energy of the battery system to the currently available energy. Estimation from currently available energy and lost energyThe remaining SOE value of the battery system is based on the formula +.>And (5) determining. The SOE is the residual SOE value of the battery system; q (Q) Can be used Is the current available energy; q (Q) t To loss energy; SOH is a life value of the battery system.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (9)

1. A method of estimating a remaining SOE value, applied to a battery system of a two-wheeled electric vehicle, comprising:
according to the system standing time, determining the current real SOC value of the battery system by using an open-circuit voltage correction SOC method;
determining 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 current road conditions;
calculating the energy loss from the battery system to the current time;
estimating a remaining SOE value of the battery system based on the current available energy and the lost energy; wherein the remaining SOE value is an energy percentage of remaining energy of the battery system to currently available energy;
the determining the current available energy according to the current real SOC value based on the relation between the rated energy and the preset parameter comprises the following steps:
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;
the corresponding pre-stored rated energy relation table is called 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, the temperature of the battery system and the SOC value;
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 life value of the battery system.
2. The method for estimating a residual SOE value according to claim 1, wherein the determining a current true SOC value of the battery system by using an open circuit voltage correction SOC method according to a system rest time includes:
judging whether the system standing time meets a preset duration range or not; if yes, 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 is not operated after the battery system is started, the current real SOC value is corrected according to the temperature of the system and the lowest single cell voltage based on the preset relation between the temperature of the system and the lowest single cell voltage and the SOC value.
3. The method for estimating a residual SOE value according to claim 1, wherein the determining a current true SOC value of the battery system by using an open circuit voltage correction SOC method according to a system rest time includes:
judging whether the system standing time meets a preset duration range or not; if yes, 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 running according to the temperature of the system and the lowest single cell voltage based on the preset relation between the temperature of the system and the lowest single cell voltage and the SOC value; the corrected initial SOC value is the true SOC value of the system;
and calculating the current SOC value according to the corrected initial SOC value and the time from the operation to the current operation.
4. A method of estimating a residual SOE value according to claim 3, characterized in that the calculating the current SOC value from the corrected initial SOC value and the time to run to the current time is determined based on:
wherein SOC is real Is an initial SOC value; the SOC is a current residual real SOC value of the battery system after operation; i is current; c (C) 0 For measuring the calibrated capacity available in the current situation; SOH is a life value of the battery system.
5. The method for estimating a residual SOE value according to claim 1, wherein the determining the current road condition of the two-wheeled vehicle according to the detected accelerator depth includes:
after the throttle depth is detected, counting a plurality of throttle depth frequency sets detected in preset time; each accelerator depth frequency set comprises a plurality of accelerator depths detected according to preset data acquisition frequency;
determining an accelerator depth frequency set with the largest occurrence number in a preset time;
determining the current road condition of the two-wheel vehicle according to the accelerator depth frequency set with the largest occurrence frequency; the accelerator depth frequency sets are in one-to-one correspondence with road conditions of the two-wheeled vehicle.
6. The method of estimating a residual SOE value according to claim 1, characterized in that determining the current available energy from a current rated energy and a life value of a battery system is based on the following determination:
Q can be used ＝Q Rated for *SOH；
Wherein Q is Can be used Is the current available energy; q (Q) Rated for Is the current rated energy; SOH is a life value of the battery system.
7. The method of claim 1, wherein the calculating the lost energy of the battery system to the current time is determined based on:
wherein Q is t Energy is lost for the battery system at the current time of operation; i is current; t is time; v is the voltage at the current time of the battery system.
8. The method of estimating a remaining SOE value as set forth in claim 7, wherein the estimating the remaining SOE value of the battery system from the current available energy and the lost energy is based on the following determination:
wherein the SOE is the remaining SOE value of the battery system; q (Q) Can be used Is the current available energy; q (Q) t To loss energy; SOH is a life value of the battery system.
9. An estimation device of residual SOE values, characterized by being configured to perform the method for estimating residual SOE values according to any one of claims 1 to 8, comprising:
the SOC value acquisition module is used for determining a 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 acquisition module is used for 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 current road conditions;
the calculation module is used for calculating the loss energy of the battery system running to the current time;
a remaining SOE value estimation module configured to estimate 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 remaining energy of the battery system to currently available energy.
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