WO2016194271A1 - 補機用バッテリの状態判定装置、及び、補機用バッテリの状態判定方法 - Google Patents
補機用バッテリの状態判定装置、及び、補機用バッテリの状態判定方法 Download PDFInfo
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- WO2016194271A1 WO2016194271A1 PCT/JP2016/001160 JP2016001160W WO2016194271A1 WO 2016194271 A1 WO2016194271 A1 WO 2016194271A1 JP 2016001160 W JP2016001160 W JP 2016001160W WO 2016194271 A1 WO2016194271 A1 WO 2016194271A1
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- auxiliary
- battery
- magnitude
- terminal voltage
- internal resistance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/12—Recording operating variables ; Monitoring of operating variables
-
- 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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- 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
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/20—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having different nominal voltages
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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]
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
-
- 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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a state determination device that determines the state of a drive battery that is a power source of a vehicle drive motor and an auxiliary battery that is provided separately, and a state determination method for an auxiliary battery.
- Patent Document 1 discloses an apparatus for estimating the state of a battery for starting an engine using a current sensor having a small full scale.
- the state of the battery is measured using the current value before a large inrush current flows, that is, the current value measurable by a current sensor with a small full scale. Is estimated.
- An auxiliary battery state determination apparatus is provided separately from a driving battery that is a power source of a vehicle driving motor, and is an auxiliary battery that is an auxiliary power source whose output voltage is lower than that of the driving battery.
- the sensor part which detects the magnitude
- the internal resistance calculation part which calculates the internal resistance of the battery for auxiliary machines based on the magnitude
- the internal resistance calculation unit detects a stable period in which the magnitude of the terminal voltage and the current is within a predetermined fluctuation range before the auxiliary machine is activated, and the activation of the auxiliary machine.
- the internal resistance is calculated based on the magnitude of the terminal voltage and the magnitude of the current detected by the sensor unit within a predetermined period.
- a method for determining a state of an auxiliary battery according to the present invention is provided separately from a driving battery that is a power source of a vehicle driving motor, and is an auxiliary battery that is an auxiliary power source whose output voltage is lower than that of the driving battery.
- a detecting step of detecting the magnitude of the terminal voltage and the magnitude of the current flowing through the auxiliary battery.
- an internal resistance calculating step of calculating an internal resistance of the auxiliary battery based on the magnitude of the terminal voltage and the magnitude of the current detected in the detecting step is included.
- a stable period in which the magnitude of the terminal voltage and the current is within a predetermined fluctuation range and the activation of the auxiliary machine are detected before the auxiliary machine is activated.
- the internal resistance is calculated based on the magnitude of the terminal voltage and the magnitude of the current detected in the detection step within a predetermined period.
- the block diagram which shows a part of vehicle provided with the state determination apparatus which concerns on this Embodiment The graph which shows the voltage of the battery for auxiliary machines which concerns on embodiment of this invention
- the auxiliary battery is a battery serving as a power source for an auxiliary machine that is provided separately from a driving battery for supplying large electric power to a driving motor such as a hybrid vehicle.
- the output voltage of the auxiliary battery is lower than the output voltage of the driving battery.
- the present invention provides an auxiliary battery state determination apparatus and an auxiliary battery state determination method capable of accurately and appropriately determining the state of an auxiliary battery in which a large inrush current does not flow.
- the purpose is to do.
- FIG. 1 is a block diagram illustrating a part of a vehicle including a state determination device 10 according to the present embodiment.
- the state determination device 10 is mounted on an electric vehicle such as a hybrid vehicle, a plug-in hybrid vehicle, or an electric vehicle.
- an auxiliary battery that is a power source of an auxiliary machine having an output voltage lower than that of the driving battery is provided separately from the driving battery that is the power source of the driving motor of the vehicle.
- the present invention can be applied to any vehicle provided.
- the vehicle includes a state determination device 10, an auxiliary battery 20, an ECU (Electric Control Unit) 30, a load 31, a driving battery 41, a DC-DC converter 42, a motor peripheral auxiliary machine 43, A drive motor 44 is provided.
- ECU Electronic Control Unit
- the state determination device 10 is a device that determines the state of the auxiliary battery 20.
- the state determination device 10 determines the state of the auxiliary battery 20 at a timing according to the discharge information output from the ECU 30. Details of the configuration of the state determination device 10 will be described later.
- the auxiliary battery 20 is a battery such as a lead-acid battery that can be charged and discharged.
- the auxiliary battery 20 supplies power to the load 31, the ECU 30, the motor peripheral auxiliary machine 43, and the state determination device 10.
- the auxiliary battery 20 is charged by the driving battery 41 via the DC-DC converter 42.
- the ECU30 controls the equipment mounted on the vehicle. For example, the ECU 30 transmits an operation control signal to the motor peripheral accessory 43 to control the motor peripheral accessory 43, and transmits a voltage control signal to the DC-DC converter 42 to control the DC-DC converter 42. Do.
- the ECU 30 transmits discharge information indicating that the auxiliary battery 20 is discharged to the state determination device 10. Further, the ECU 30 receives information on the state determination result of the auxiliary battery 20 from the state determination device 10 and performs control according to the determination result.
- the load 31 is various electric devices mounted on a vehicle such as an air conditioner, interior lighting, a meter panel, and a lighting device.
- the driving battery 41 supplies a large amount of electric power used for traveling of the vehicle to the driving motor 44 via the motor peripheral accessory 43.
- the driving battery 41 is, for example, a lithium ion battery.
- the DC-DC converter 42 lowers the voltage of the driving battery 41 and outputs the electric power of the driving battery 41 to the power supply line L10. As a result, the DC-DC converter 42 supplies power to the load 31 and charges the auxiliary battery 20.
- the DC-DC converter 42 is controlled by the ECU 30.
- the motor peripheral auxiliary machine 43 is an auxiliary machine necessary for driving the driving motor 44.
- the motor peripheral accessory 43 includes a relay switch that opens and closes the contact of the power line of the drive battery 41 and the contact of the power line such as an inverter circuit in the drive motor 44.
- the motor peripheral auxiliary machine 43 is driven by the electric power of the auxiliary battery 20 based on the operation control signal output from the ECU 30.
- the drive motor 44 is a drive motor that drives the vehicle.
- the drive motor 44 is driven by power supplied from the drive battery 41.
- the state determination device 10 includes a timing determination unit 11, a sensor unit 12, an internal resistance calculation unit 13, and a storage unit 14.
- each functional block of the state determination device 10 may be configured as a one-chip semiconductor integrated circuit, except for the elements of the sensor unit 12 (such as current detection resistors). Further, the state determination device 10 may be configured by a plurality of semiconductor integrated circuits except for the elements of the sensor unit 12.
- a part of the state determination device 10 or the whole except the elements of the sensor unit 12 may be configured by one semiconductor integrated circuit together with the ECU 30 or another ECU mounted on the vehicle. Further, the plurality of functional blocks of the state determination device 10 may be integrated into one functional block.
- the timing determination unit 11 determines the timing for determining the state of the auxiliary battery 20 based on the discharge information transmitted by the ECU 30.
- the timing determination unit 11 transmits a signal to the internal resistance calculation unit 13 at the above timing to notify the internal resistance calculation unit 13 that it is a timing for determining the state of the auxiliary battery 20.
- the sensor unit 12 detects the charge / discharge current and the terminal voltage of the auxiliary battery 20.
- the charging / discharging current and the terminal voltage value detected by the sensor unit 12 are stored in the storage unit 14.
- the internal resistance calculation unit 13 reads the values of the discharge current and the terminal voltage stored in the storage unit 14 from the storage unit 14 based on the timing notified from the timing determination unit 11. Then, the internal resistance calculation unit 13 performs a state determination process for calculating the internal resistance of the auxiliary battery 20 using the value read from the storage unit 14. Details of these state determination processes will be described later.
- the internal resistance calculation unit 13 notifies the ECU 30 of the calculation result of the internal resistance as a state determination result.
- the internal resistance calculation unit 13 may output the state determination result to another control unit.
- a display unit (not shown) of the state determination device 10 may display the result or give a warning based on the state determination result.
- the storage unit 14 stores the charge / discharge current of the auxiliary battery 20 detected by the sensor unit 12 and the value of the terminal voltage.
- the motor peripheral auxiliary machine 43 is driven by the electric power of the auxiliary battery 20.
- power can be supplied from the drive battery 41 to the drive motor 44.
- the driving motor 44 is driven by the electric power of the driving battery 41
- the auxiliary battery 20 is charged from the driving battery 41 via the DC-DC converter 42.
- the ECU30 transmits the discharge information which shows that the battery 20 for auxiliary machines discharges to the timing judgment part 11 of the state determination apparatus 10.
- the timing determination unit 11 determines the timing for detecting the discharge current and the terminal voltage in the auxiliary battery 20 based on the discharge information received from the ECU 30, and notifies the internal resistance calculation unit 13 of the timing.
- FIG. 2 is a diagram illustrating some examples of voltage changes of the auxiliary battery 20
- FIG. 3 is a diagram illustrating a calculation result of the internal resistance of the auxiliary battery 20
- FIG. 5 is a diagram showing variation in calculation results of internal resistance of auxiliary battery 20. A method for calculating the internal resistance will be described in detail later.
- the horizontal axis of FIG. 4 is the elapsed time after the activation detection of the motor peripheral accessory 43. Whether or not the motor peripheral accessory 43 is activated is determined by various methods.
- whether or not the motor peripheral accessory 43 has been activated depends on whether or not the internal resistance of the auxiliary battery 20 has a minimum value, whether or not the voltage of the auxiliary battery 20 has reached a minimum value, It is determined by detecting whether the terminal voltage of the battery for battery 20 has decreased by a predetermined value or whether the discharge current of the auxiliary battery 20 has reached a predetermined value.
- the internal resistance shows a minimum value at the time of 5 ms.
- the activation detection time is 5 ms.
- the terminal voltage of the auxiliary battery 20 shows different time transitions for each measurement, but the value of the internal resistance varies less from 5 ms to 15 ms as shown in FIG. This is apparent from the fact that the variation in internal resistance is smaller than a practical value of 0.25 m ⁇ in FIG. 4 between 0 ms and 10 ms.
- the timing determination unit 11 receives discharge information from the ECU 30, the timing determination unit 11 detects the activation of the motor peripheral auxiliary device 43, and the internal resistance calculation unit 13 uses the timing determination unit 11 to detect the motor peripheral auxiliary device 43.
- the internal resistance of the auxiliary battery 20 is calculated using the discharge current and the terminal voltage within a predetermined period after the start detection is performed. As shown in FIG. 4, the predetermined period is preferably 10 ms or less.
- the predetermined period can be set as appropriate, for example, by performing an experiment or the like.
- the terminal voltage of the auxiliary battery 20 decreases due to the activation of the motor peripheral auxiliary machine 43. It is preferable that the terminal voltage is set so as to include a time point at which the terminal voltage shows a minimum value later.
- the terminal voltage of the auxiliary battery 20 decreases after the motor peripheral auxiliary machine 43 is started, and then the terminal voltage shows a minimum value.
- the terminal voltage may be set so as to include the minimum value.
- the timing determination unit 11 determines whether or not discharge information has been received from the ECU 30 (step S1).
- timing judgment part 11 repeats the process of step S1, when the discharge information is not received from ECU30 (step S1: NO).
- step S1 when the timing determination unit 11 receives discharge information from the ECU 30 (step S1: YES), the timing determination unit 11 transmits a signal to the internal resistance calculation unit 13 to discharge the auxiliary battery 20 discharge current I0 and the terminal voltage V0. Is notified to the internal resistance calculator 13 (step S2).
- the discharge current I0 and the terminal voltage V0 are stable before the motor peripheral accessory 43 is started and during which the magnitude of the discharge current and the magnitude of the terminal voltage are within a predetermined fluctuation range.
- Current value and voltage value. This stable period may be determined in advance based on an experimental result or the like, or may be determined based on a detection result of the sensor unit 12.
- the internal resistance calculation unit 13 acquires the discharge current I0 of the auxiliary battery 20 and the detected value of the terminal voltage V0 from the sensor unit 12 and stores them in the storage unit 14 (step S3).
- the timing determination unit 11 determines whether or not the motor peripheral accessory 43 has been activated (step S4). When it is determined that the motor peripheral accessory 43 is not activated (step S4: NO), the timing determination unit 11 repeats the process of step S4.
- step S4 determines that the motor peripheral auxiliary machine 43 has started (step S4: YES)
- the timing determination unit 11 transmits a signal to the internal resistance calculation unit 13, and the discharge current I1 of the auxiliary battery 20 and Then, the internal resistance calculation unit 13 is notified that it is time to detect the terminal voltage V1 (step S5).
- the discharge current I1 and the terminal voltage V1 are a current value and a voltage value measured within a predetermined period after the activation of the motor peripheral accessory 43 is detected by the timing determination unit 11.
- the predetermined period is 10 ms.
- the internal resistance calculation unit 13 acquires the values of the discharge current I1 and the terminal voltage V1 of the auxiliary battery 20 measured by the sensor unit 12 within the predetermined period from the sensor unit 12, and the storage unit 14 (Step S6).
- the internal resistance calculation unit 13 calculates the values of the discharge current I0 and the terminal voltage V0 stored in the storage unit 14 in step S3 and the discharge current I1 and the terminal voltage V1 stored in the storage unit 14 in step S6.
- the internal resistance is calculated by a method such as a two-point method using the value (step S7).
- the internal resistance calculation unit 13 calculates the internal resistance Ri of the auxiliary battery 20 according to the following equation (1).
- the sensor unit 12 of the state determination device 10 is provided separately from the drive battery 41 that is the power source of the vehicle drive motor 44, and the output voltage is lower than that of the drive battery 41.
- the magnitude of the terminal voltage of the auxiliary battery 20 that is the power source of the auxiliary machine (for example, the motor peripheral auxiliary machine 43) and the magnitude of the current flowing through the auxiliary battery 20 are detected.
- the internal resistance calculation unit 13 detects a stable period in which the magnitude of the terminal voltage and the current is within a predetermined fluctuation range before the auxiliary machine is activated, and the activation of the auxiliary machine.
- the internal resistance of the auxiliary battery 20 is calculated based on the magnitude of the terminal voltage and the magnitude of the current detected by the sensor unit 12 within a predetermined period. Thereby, the dispersion
- the predetermined period is set to a period including a point in time when the terminal voltage shows a minimum value after the terminal voltage is reduced by the activation of the auxiliary machine.
- the predetermined period is set to a period including a point in time when the terminal voltage has shown a minimum value in the past after the terminal voltage has decreased due to the activation of the auxiliary machine. This makes it possible to easily and appropriately set a period during which the variation in internal resistance is small.
- the predetermined period is a period of 10 milliseconds or less. In this case as well, the period in which the variation in internal resistance is reduced can be set easily and appropriately.
- the present invention is suitably used for a device that is provided separately from a driving battery that is a power source for a vehicle driving motor and that determines the state of an auxiliary battery that is an auxiliary power source whose output voltage is lower than the driving battery. it can.
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- Engineering & Computer Science (AREA)
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Abstract
Description
本実施の形態に係る状態判定装置10を備える車両の構成につき、図1を参照しながら詳細に説明する。図1は、本実施の形態に係る状態判定装置10を備える車両の一部を示すブロック図である。
次に、状態判定装置10の構成につき、図1を参照しながら詳細に説明する。
次に、本発明の実施の形態に係る状態判定装置10を備える車両の動作につき、詳細に説明する。
本実施の形態に係る補機用バッテリ20における放電電流と端子電圧との検出タイミングにつき、図2から図4を参照しながら詳細に説明する。ここで、図2は、補機用バッテリ20の電圧変化のいくつかの例を示す図であり、図3は、補機用バッテリ20の内部抵抗の算出結果を示す図であり、図4は、補機用バッテリ20の内部抵抗の算出結果のばらつきを示す図である。内部抵抗の算出方法については後に詳しく説明する。
次に、本実施の形態に係る補機用バッテリ20の状態判定処理につき、図5を参照しながら詳細に説明する。
そして、内部抵抗算出部13は、算出した内部抵抗Riの情報を状態判定結果としてECU30に出力する(ステップS8)。
11 タイミング判断部
12 センサ部
13 内部抵抗算出部
14 記憶部
20 補機用バッテリ
30 ECU
31 負荷
41 駆動用バッテリ
42 DC-DCコンバータ
43 モータ周辺補機
44 駆動用モータ
Claims (5)
- 車両の駆動用モータの電源である駆動用バッテリと別に設けられ、該駆動用バッテリよりも出力電圧が低い補機の電源である補機用バッテリの端子電圧の大きさ、及び、該補機用バッテリに流れる電流の大きさを検出するセンサ部と、
前記センサ部が検出した端子電圧の大きさ、及び、前記電流の大きさに基づいて、前記補機用バッテリの内部抵抗を算出する内部抵抗算出部と、
を備え、
前記内部抵抗算出部は、前記補機が起動される前で、かつ、前記端子電圧の大きさ、及び、前記電流の大きさが所定の変動範囲に収まる安定期間と、前記補機の起動が検知されてから所定の期間内において前記センサ部が検出した前記端子電圧の大きさ、及び、前記電流の大きさに基づいて前記内部抵抗を算出する補機用バッテリの状態判定装置。 - 前記所定の期間は、前記補機の起動により前記端子電圧が低下した後に該端子電圧が極小値を示す時点を含む期間に設定される請求項1に記載の補機用バッテリの状態判定装置。
- 前記所定の期間は、前記補機の起動により前記端子電圧が低下した後に該端子電圧が極小値を過去に示した時点を含む期間に設定される請求項1に記載の補機用バッテリの状態判定装置。
- 前記所定の期間は、10ミリ秒以下である請求項1に記載の補機用バッテリの状態判定装置。
- 車両の駆動用モータの電源である駆動用バッテリと別に設けられ、該駆動用バッテリよりも出力電圧が低い補機の電源である補機用バッテリの端子電圧の大きさ、及び、該補機用バッテリに流れる電流の大きさを検出する検出ステップと、
前記検出ステップにおいて検出された端子電圧の大きさ、及び、前記電流の大きさに基づいて、前記補機用バッテリの内部抵抗を算出する内部抵抗算出ステップと、
を含み、
前記内部抵抗算出ステップでは、前記補機の起動の起動される前で、かつ、前記端子電圧の大きさ、及び、前記電流の大きさが所定の変動範囲に収まる安定期間と、前記補機の起動が検知されてから所定の期間内において前記検出ステップにおいて検出された前記端子電圧の大きさ、及び、前記電流の大きさに基づいて前記内部抵抗を算出する補機用バッテリの状態判定方法。
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