WO2016072091A1 - 充電制御装置及び充電制御方法 - Google Patents
充電制御装置及び充電制御方法 Download PDFInfo
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- WO2016072091A1 WO2016072091A1 PCT/JP2015/005536 JP2015005536W WO2016072091A1 WO 2016072091 A1 WO2016072091 A1 WO 2016072091A1 JP 2015005536 W JP2015005536 W JP 2015005536W WO 2016072091 A1 WO2016072091 A1 WO 2016072091A1
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- storage state
- charging
- charge
- secondary battery
- battery
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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
- 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]
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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
- B60L3/0023—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
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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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
- B60L50/15—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with additional electric power supply
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/24—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means
- B60W10/26—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
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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
- H01M10/44—Methods for charging or discharging
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
- H02J7/16—Regulation of the charging current or voltage by variation of field
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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
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- 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
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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
- 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
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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
- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Definitions
- the present invention relates to a charge control device and a charge control method for controlling charging of a secondary battery from a generator driven by an engine.
- a charging control method for a secondary battery mounted on an automobile a method of maintaining a target capacity at a predetermined value smaller than the rated charging capacity of the secondary battery is known (see Patent Document 1).
- the secondary battery if the secondary battery is always charged up to the rated charge capacity, the energy generated by braking cannot be efficiently regenerated and used.
- the secondary battery has a margin for regenerative charging when electric energy is generated. Then, by using the regeneratively charged energy as an auxiliary driving force, it is possible to reduce the fuel consumption of the internal combustion engine accordingly.
- the battery is uniformly charged after the idle stop (after the engine restarts), the charging current falls within a predetermined range, and the battery voltage exceeds the predetermined voltage over a predetermined time.
- the battery is determined to have reached a fully charged state, and charging of the battery is terminated.
- Battery storage state or charge state (SOC: State Of Charge, 100% and 0% for full charge and full discharge, respectively, and standardized remaining battery capacity (storage state)) Is determined from the charging current or the battery voltage (meaning that it is estimated or estimated, but in this specification, it is unified with “determination” and distinguished from “estimation”) as described in Patent Document 2. For example, it is grasped by estimating based on the integrated value of the charging / discharging current of the battery detected by the current sensor. However, when the storage state is estimated based on the integrated value of the charging / discharging current, if the initial state of the storage state is incorrect, the estimated storage state is also incorrect. Therefore, in the charge control device mounted on a commercially available vehicle, the storage state is determined based on the charge current detected when charging the battery, and the recognized storage state is If they are different from each other, the recognized storage state is corrected (calibrated).
- the battery voltage increases, so the potential difference between the battery voltage and the charge voltage decreases, and the charge current Therefore, it becomes difficult to accurately determine the state of charge from the charging current. Therefore, in a charge control device mounted on a commercial vehicle, when it is confirmed that the storage state is equal to or higher than a predetermined storage state where accurate determination of the storage state is difficult, the storage state of the battery is set to be higher than the fully charged state. It is assumed that the power storage state is low (for example, 80%).
- an upper limit value (for example, 80%) is set for the battery storage state, and this is used as a control center (control target value) to set the battery storage state to the upper limit value.
- Fuel consumption is improved by performing control to maintain (hereinafter referred to as normal control) and charging the battery at an appropriate timing, such as during fuel cut running, in an electricity storage state where the charging efficiency is lower than the upper limit. .
- an object of the present invention is to provide a charge control device and a charge control method that can suppress deterioration in fuel consumption.
- the present invention provides a charge control device (10) for controlling charging from a generator (14) driven by an engine (11) to a secondary battery (13), A charging current detecting means (15b) for detecting a charging current (Ic) to the secondary battery (S2) and a discharging current (Id) from the secondary battery (S2) are detected. And calculating an integrated charge / discharge amount (IW) of the secondary battery based on the charge current and the discharge current (S3) and a secondary charge based on the integrated charge / discharge amount (23).
- the present invention also relates to a charging control method for controlling charging of the secondary battery (13) from the generator (14) driven by the engine (11), wherein the charging current (Ic) to the secondary battery is A charging current detection step (S2) for detecting the discharge current, a discharge current detection step (S2) for detecting a discharge current (Id) from the secondary battery, and the secondary battery based on the charge current and the discharge current A charging / discharging amount integrating step (S3) for calculating an integrated charging / discharging amount (IW), a step (S3) of recognizing a storage state of the secondary battery based on the integrated discharging / charging amount as a recognized storage state (SOCr),
- the charging of the secondary battery is controlled by switching the power generation voltage of the generator so that the recognized power storage state (SOCr) is maintained at a predetermined upper limit value (80%) smaller than the fully charged state (100%).
- the battery further comprises a storage state determination means (23) for determining a storage state of the secondary battery based on the charging current during charging of the secondary battery (S5), wherein the storage state recognition
- the unit calibrates the recognized storage state based on the storage state determined by the storage state determination unit, and the charge control unit is required for determining the storage state by the storage state determination unit immediately after the engine is started.
- the secondary battery is charged for a predetermined determination time (Tr) (S42 to S43, S61 to S62), and when it is detected that the terminal of the secondary battery is disconnected (S31: Yes), the charging is performed.
- the control means only when the state of charge of the reconnected secondary battery determined immediately after the engine is started is equal to or higher than the upper limit (S63: Yes), To prohibit the charging of the battery (S69) may be configured.
- the charge control device is mounted on the vehicle (1), and the charge control means charges the secondary battery during fuel cut traveling of the vehicle (S53, S87),
- the power storage state recognition unit is determined by the power storage state determination unit during charging during the fuel cut traveling (S72, S87).
- the recognized power storage state may be calibrated using the stored power state of the reconnected secondary battery (S7 to S13).
- the battery is recognized during charging during fuel cut traveling.
- the storage state can be calibrated. Further, since the recognized power storage state is calibrated at the time of charging during fuel cut traveling, it is not necessary to use fuel for calibration, and deterioration of fuel consumption can be suppressed.
- the charge control device is mounted on a vehicle that performs idle stop, it is detected that the terminal of the secondary battery has been removed (S31: Yes), and the engine is restarted by the idle stop.
- the charging control means charges the reconnected secondary battery. It may be configured to forcibly perform the predetermined determination time (S92 to S93).
- the state where fuel cut traveling is not performed that is, the state where the recognized power storage state cannot be calibrated using the power storage state of the secondary battery to which the power storage state recognizing means is reconnected is Can be prevented from continuing for a long time.
- the recognized power storage state is prevented from excessively decreasing while deviating from the actual power storage state.
- the storage state recognition means recognizes the stored power. The condition cannot be calibrated. According to this configuration, even when fuel cut traveling that continues for a predetermined determination time or longer is not performed, the storage state recognition unit can calibrate the recognized storage state.
- the predetermined determination time is detected before it is detected that the terminal of the secondary battery has been removed (S31: Yes) and the idle stop is performed a predetermined number of times (for example, three times).
- the charging control means charges the reconnected secondary battery after the engine restart by the predetermined idle stop. It may be configured to forcibly perform over a predetermined determination time (S92 to S93).
- the recognized power storage is performed during idle stop where the power storage state tends to decrease. There is a risk that the engine will suddenly start in order to reach the predetermined discharge lower limit value and forcibly charge. According to this configuration, it is possible to suppress the occurrence of such a situation by forcibly charging the secondary battery to which the charge control unit is reconnected after the engine is restarted by a predetermined idle stop.
- the storage state recognition unit can calibrate the storage state before the recognized storage state reaches the lower limit value.
- the actual storage state of the secondary battery is
- the control value is larger than the upper limit value, which is the control center, it is possible to provide a charge control device capable of converging the actual power storage state to the upper limit value early, charging efficiently, and suppressing deterioration in fuel consumption.
- FIG. Schematic configuration diagram of a charging control device according to the present invention Block diagram of the ECU shown in FIG. Flowchart showing the procedure of recognition control of the recognition power storage state Flow chart showing the procedure of terminal disconnection detection control Flowchart showing charging control procedure
- the flowchart which shows the procedure of the normal control shown in FIG.
- the flowchart which shows the procedure of the discharge control shown in FIG.
- the flowchart which shows the procedure of the charge prohibition control shown in FIG.
- FIG. which shows the procedure of the charge prohibition control shown in FIG.
- the charging control device 10 mounted on the idle stop vehicle applies the driving force of the internal combustion engine 11 to the driving wheels W and W of the host vehicle via a transmission 12 such as a CVT or a manual transmission.
- a transmission 12 such as a CVT or a manual transmission.
- a battery 13 such as a 12-volt lead-acid battery mounted on the vehicle 1 for transmission and driving various auxiliary machines, including a battery 13, an AC generator (ACG) 14, Current sensors 15a and 15b, a voltage sensor 16, and an ECU (electronic arithmetic unit) 17 are provided.
- the crankshaft 11 a of the internal combustion engine 11 and the rotating shaft 14 a of the AC generator 14 are connected via a driving force transmission unit 18, and the AC generator 14 is an internal combustion engine that is transmitted via the driving force transmission unit 18. Electricity can be generated by the driving force of the engine 11.
- the driving force transmission unit 18 is paired with, for example, a crankshaft pulley 18a provided integrally with the crankshaft 11a of the internal combustion engine 11 and the crankshaft pulley 18a.
- a drive shaft pulley 18b provided integrally and a belt 18c stretched between the crank shaft pulley 18a and the drive shaft pulley 18b are configured. That is, the driving force of the internal combustion engine 11 is transmitted to the AC generator 14 via the belt 18c between the crankshaft pulley 18a and the drive shaft pulley 18b.
- the battery 13 is connected to an AC generator 14, and the AC generator 14 rectifies AC power obtained by receiving a charging command from the ECU 17 by the driving force of the internal combustion engine 11 into DC power, and the battery 13. To charge.
- the ECU 17 recognizes an accumulative storage state SOCr, which will be described later, and the amount of electric power supplied from the battery 13 to a load 19 composed of, for example, various lamps and a compressor of an air conditioner, that is, a discharge current Id to the load 19, Depending on the product of the inter-terminal voltage VB and the time T, the charging of the battery 13, that is, the power generation operation of the AC generator 14 is controlled.
- the ECU 17 controls the power generation of the AC generator 14 so that the DC voltage obtained by the power generation of the AC generator 14 is 14.5 V, and does not charge the battery 13.
- the AC generator 14 is controlled to generate power so that the DC voltage obtained by the power generation of the AC generator 14 is 12.0V. That is, the ECU 17 switches the power generation instruction voltage for the AC generator 14 between the normal time when charging is not performed and the charging time.
- the ECU 17 receives a detection signal of the discharge current Id from the battery 13 to the load 19 output from the current sensor 15a, a detection signal of the inter-terminal voltage VB of the battery 13 output from the voltage sensor 16, and the current sensor 15b.
- a detection signal or the like of the charging current Ic flowing from the AC generator 14 to the battery 13 is input.
- two current sensors 15a and 15b are shown in FIG. 1, a single current sensor 15 may detect the discharge current Id and the charge current Ic.
- the automobile 1 includes an engine ECU (not shown).
- the engine ECU When the intention of the vehicle to stop after traveling is determined by the engine ECU, for example, the vehicle speed becomes 0 and the brake pedal is depressed.
- the engine stop condition When the engine stop condition is satisfied, the internal combustion engine 11 is stopped and the driver's intention to travel is determined. For example, a predetermined engine restart condition such as release of the brake pedal operation is satisfied
- a predetermined engine restart condition such as release of the brake pedal operation is satisfied
- an idle stop is performed to restart the internal combustion engine 11.
- an idle stop signal IS output from the engine ECU is input to the ECU 17.
- the engine ECU starts the internal combustion engine 11 in response to the input of the ignition on signal IG-ON, and controls the fuel supply amount and the throttle opening degree to the internal combustion engine 11 in accordance with the depression amount of the accelerator pedal.
- the ignition on signal IG-ON is also input to the ECU 17.
- the engine ECU performs fuel cut to reduce the fuel supply amount to the internal combustion engine 11 when a predetermined fuel cut condition such as that the amount of depression of the accelerator pedal becomes 0 while the automobile 1 is traveling is satisfied.
- a fuel cut signal FC output from the engine ECU is input to the ECU 17.
- a detection signal of the charging current Ic flowing from the AC generator 14 to the battery 13 output from the current sensor 15 b and the terminal voltage VB of the battery 13 output from the voltage sensor 16 are input to the storage state calculation unit 21.
- the storage state determination unit 22 is based on at least the charging current Ic (hereinafter simply referred to as “at least the charging current Ic”) of the input charging current Ic and the inter-terminal voltage VB (charging voltage). Then, the storage state SOC of the battery 13 is determined. In order for the storage state determination unit 22 to determine the storage state SOC, the charging current Ic needs to be continuously input over a predetermined determination time Tr.
- the storage state determination unit 22 considers the storage state SOC to be a predetermined value (80%). Therefore, the storage state SOC determined by the storage state determination unit 22 does not necessarily match the actual storage state SOC (hereinafter referred to as the actual storage state SOCa). The determination timing of the storage state SOC performed by the storage state calculation unit 21 will be described later.
- the detection signal of the discharge current Id flowing from the battery 13 to the load 19 output from the current sensor 15a is also input to the storage state calculation unit 21.
- the discharge amount integration unit 23 integrates a value obtained by integrating the charge amount (positive value) to the battery 13 based on the input charge current Ic and the inter-terminal voltage VB (charge voltage), and an input Based on the discharge current Id and the inter-terminal voltage VB, an integrated charge / discharge amount IW that is the sum of the values obtained by integrating the discharge amount (negative value) from the battery 13 is calculated.
- the integrated discharge charge amount IW is positive (charge side) when the integrated value of charge amount is larger than the integrated value of discharge amount, and is negative (discharge) when the integrated value of discharge amount is larger than the integrated value of charge amount. Side).
- the storage state SOC determined by the storage state determination unit 22 and the accumulated discharge amount IW of the battery 13 integrated by the discharge amount integration unit 23 are input to the storage state recognition unit 24.
- the power storage state recognition unit 24 updates (recognizes) the recognized power storage state SOCr by adding the accumulated discharge amount IW to the recognized (held) power storage state SOC (hereinafter referred to as the recognized power storage state SOCr).
- the power storage state recognition unit 24 performs updating as needed, it may be considered that the power storage state recognition unit 24 includes the function of the charge / discharge amount integration unit 23.
- the storage state recognition unit 24 determines the storage state SOC when the storage state SOC is determined by the storage state determination unit 22 and the storage state SOC determined as the recognized storage state SOCr is different.
- the recognized storage state SOCr is corrected by replacing it with the value of the state SOC (in other words, the recognized storage state SOCr is calibrated to a more correct value based on the determined storage state SOC).
- the recognized storage state SOCr is greater than the predetermined value (80%) and the determined storage state SOC is the predetermined value (including the case where the determined storage state SOC is regarded as the predetermined value)
- the recognized storage state SOCr Since this is closer to the actual power storage state SOCa, the power storage state recognition unit 24 maintains the recognized power storage state SOCr without correction.
- the power storage state recognition unit 24 outputs the calculated recognized power storage state SOCr to the charge control unit 26.
- the inter-terminal voltage VB of the battery 13 output from the voltage sensor 16 is also input to the terminal disconnection detection unit 25.
- the terminal disconnection detection unit 25 detects that the terminal of the battery 13 has been disconnected when the inter-terminal voltage VB of the battery 13 becomes 0V.
- the terminal disconnection detection unit 25 outputs a terminal disconnection signal TF to the charge control unit 26 when detecting that the terminal of the battery 13 is disconnected.
- the charge control unit 26 also receives the above-described ignition on signal IG-ON, idle stop signal IS, and fuel cut signal FC.
- the charge control unit 26 controls charging (generated voltage) by the AC generator 14 based on these input signals. Specifically, when the ignition control signal IG-ON is input, the charging control unit 26 performs charging for the predetermined determination time Tr described above, so that the storage state determination unit 22 immediately after the engine is started is stored in the storage state of the battery 13.
- the SOC is determined so that the storage state recognition unit 24 can calibrate the recognized storage state SOCr.
- the charging control unit 26 charges the battery 13 so that the recognized storage state SOCr is maintained at a predetermined upper limit value (80% in the present embodiment) smaller than the fully charged state (100%). To control. However, since it is difficult to always maintain the recognized power storage state SOCr at the upper limit value, which affects the merchantability, the charging control unit 26 sets the lower limit value (77% in this embodiment) in addition to the upper limit value. If the recognized storage state SOCr is equal to or higher than the upper limit value (including the case where the recognized storage state SOCr is regarded as the upper limit value), the battery 13 is not charged and the recognized storage state SOCr is lower than the lower limit value. The battery 13 is forcibly charged until the recognized storage state SOCr reaches the upper limit.
- a predetermined upper limit value 80% in the present embodiment
- the charging control unit 26 sets the lower limit value (77% in this embodiment) in addition to the upper limit value. If the recognized storage state SOCr is equal to or higher than the upper limit value (including the case where the recognized storage state SOC
- the charging control unit 26 performs charging at a predetermined timing in order to improve merchantability and fuel consumption. For example, the charging control unit 26 charges the battery 13 when the fuel cut signal FC is input so as to restore the recognized power storage state SOCr to the upper limit value without affecting the fuel consumption. In the normal control of the present embodiment, at least when the recognized power storage state SOCr is equal to or higher than the upper limit value, the charging control unit 26 does not charge the battery 13 after the internal combustion engine 11 is restarted due to idle stop.
- the charge control unit 26 performs discharge control for quickly reducing the actual storage state SOCa of the battery 13 to the upper limit value when it is larger than the upper limit value that is the control center.
- the charge control unit 26 performs charge over a predetermined determination time Tr according to the input of the ignition on signal IG-ON, charge stop when the recognized storage state SOCr is equal to or higher than the lower limit, and the recognized storage state SOCr Charging when it is lower than the lower limit is performed in the same manner as in normal control.
- the correct actual power storage state SOCa is recognized by the ECU 17 by correcting the state SOCr, so that the charge control unit 26 ends the discharge control and performs the normal control.
- the recognized state of charge SOCr may not be accurate, so that the charge control unit 26 is discharged. Continue control.
- discharge control is performed as follows.
- the charge control unit 26 as a general rule until the integrated charge / discharge amount IW of the battery 13 reaches a predetermined discharge amount (in this embodiment, ⁇ 20% which is the difference from the fully charged state to the upper limit value).
- Prohibit charging For example, during this period, the charging control unit 26 forcibly performs charging when the recognized storage state SOCr becomes lower than the lower limit value in order to maintain the recognized storage state SOCr at the upper limit value, or an idle stop signal.
- the charging of the battery 13 for power consumption recovery performed after the input of IS (when the input is lost, that is, after the engine is restarted due to idle stop) is prohibited.
- the charging control unit 26 performs charging when the fuel cut signal FC is input.
- the charge control unit 26 sends the battery 13 to the battery 13 for determination of the storage state SOC and calibration of the recognized storage state SOCr. The battery is forcibly charged.
- the fuel cut traveling is a predetermined amount required for the determination of the storage state SOC by the storage state determination unit 22. Even when the determination time Tr does not continue for a longer period, the charge control unit 26 forcibly charges the battery 13 in order to determine the storage state SOC and calibrate the recognized storage state SOCr. In parallel with this, even if the fuel cut traveling is performed before the idling stop is performed a predetermined number of times (three times in the present embodiment), the charging control unit 26 determines the state of charge SOC by the state of charge determining unit 22.
- charge control is performed for determination of the storage state SOC and calibration of the recognized storage state SOCr when the engine is restarted by the third idle stop.
- the unit 26 forcibly charges the battery 13.
- the charging prohibited by the charging control unit 26 includes an exception such as charging for the purpose other than maintaining the recognized storage state SOCr at the predetermined upper limit.
- Charging performed to calibrate the SOCr and charging during fuel cut traveling performed to increase the recognized power storage state SOCr and the actual power storage state SOCa without affecting fuel consumption are included. Note that charging during fuel cut traveling does not consume fuel, and thus is performed even when the recognized storage state SOCr is equal to or greater than the predetermined upper limit value.
- the charging during the fuel cut traveling performed when the recognized storage state SOCr is less than the predetermined upper limit value will recover the recognized storage state SOCr to the predetermined upper limit value. This is different from the charge for maintaining the recognized power storage state SOCr at the upper limit value.
- the charge control unit 26 is less than 80% due to the above-mentioned exceptional charging even if the accumulated discharge amount IW of the battery 13 does not reach the predetermined discharge amount ( ⁇ 20%).
- the discharge control is terminated. Perform normal control.
- FIG. 3 shows a recognition control procedure of the recognized storage state SOCr performed by the ECU 17.
- the ECU 17 power storage state calculation unit 21 performs recognition control of the recognized power storage state SOCr illustrated in FIG. 3 when the vehicle 1 is energized, for example, when the power supply state of the automobile 1 is changed to the accessory (ACC-ON) state.
- the ECU 17 reads and recognizes the recognized power storage state SOCr at the end of the previous time stored in the nonvolatile memory first (step S1). Thereafter, or in parallel with this, the ECU 17 detects the charging current Ic, the discharging current Id, and the inter-terminal voltage VB (step S2), calculates the integrated charge / discharge amount IW, and sets the recognized power storage state SOCr to The recognized storage state SOCr is recognized (updated) by adding the accumulated discharge amount IW (step S3). The ECU 17 overwrites the non-volatile memory with the calculated recognized power storage state SOCr (step S4).
- the ECU 17 determines the storage state SOC of the battery 13 (step S5). If the storage state SOC is not determined in step S5 and the determination in step S6 is No, the ECU 17 repeats the processing in steps S2 to S5, and overwrites the latest recognized storage state SOCr in the memory as needed.
- step S7 determines whether or not the determined state of charge SOC is 80% or more of the upper limit value.
- step S7 determines whether or not the determination of the state of charge SOC is immediately after the ignition on signal IG-ON is input, that is, the first time after the engine is started. It is determined whether or not it has been performed (step S8).
- step S8 When the state of charge SOC is based on the determination immediately after the engine is started (step S8: Yes), the ECU 17 regards the determined state of charge SOC as 80% and sets the recognized state of charge SOCr as the value of the state of charge SOC (80 %) (Step S9).
- step S11 determines whether or not the current recognized state of charge SOCr is 80% or more (step S11), and the recognized state of charge. If the state SOCr is less than 80% (No), the process in step S9, that is, the recognized state of charge SOC is regarded as 80% and the recognized state of charge SOCr is corrected to the value (80%) of the state of charge SOC. To do. If the recognized power storage state SOCr is 80% or more in step S11 (Yes), the ECU 17 sets the recognized power storage state SOCr calculated (estimated) based on the integrated charge / discharge amount IW to be greater than the determined power storage state SOC. It is held as it is as an accurate value (step S12). That is, the recognized storage state SOCr is not corrected to the value of the storage state SOC that is assumed to be 80% lower than this.
- step S6 when the determined storage state SOC is less than 80% (No), the ECU 17 determines that the determined storage state SOC is the same value or substantially the same value as the recognized storage state SOCr currently held (for example, , Within a range of ⁇ 0.5%) (step S12). If the storage state SOC is the same value or substantially the same value as the recognized storage state SOCr in step S12 (Yes), the ECU 17 proceeds to step S11 and holds the recognized storage state SOCr. If the storage state SOC is a value different from the recognized storage state SOCr in step S12 (No), the ECU 17 corrects the recognized storage state SOCr to the value of the storage state SOC determined to be less than 80% (step S13).
- the ECU 17 overwrites the memory with the recognized power storage state SOCr corrected or held as it is (step S10), and repeats the above procedure. Note that since the ECU 17 already holds the recognized power storage state SOCr, it is not necessary to read the recognized power storage state SOCr in step S1.
- FIG. 4 shows a procedure of terminal disconnection detection control performed by the ECU 17.
- the ECU 17 terminal detachment detection unit 25 continuously recognizes the recognition power storage state SOCr shown in FIG. 4 not only when the energization state of the automobile 1 is an accessory (ACC-ON) or ON but also when it is OFF. I do.
- the control period of the terminal detachment detection system is set to an appropriate value that is relatively long.
- step S21 the ECU 17 first detects the inter-terminal voltage VB of the battery 13 (step S21), and determines whether or not the inter-terminal voltage VB is 0V (step S22).
- step S22 the ECU 17 outputs a terminal disconnection signal TF (step S23) and repeats the above procedure. Since the battery 13 is normally removed when the battery is replaced or the like, the ECU 17 records the terminal disconnection signal TF in the nonvolatile memory in step S23 because the energized state of the automobile 1 is normally OFF.
- FIG. 5 shows a procedure for controlling the charging of the battery 13 performed by the ECU 17.
- the ECU 17 (mainly the charge control unit 26) starts the charge control shown in FIG. 5 after the internal combustion engine 11 is started, and continues the charge control during the operation period of the internal combustion engine 11.
- the ECU 17 first determines whether or not the terminal disconnection signal TF is output, that is, whether or not it is recorded in the memory (step S31). When the terminal detachment signal TF is not recorded (step S31: No), the ECU 17 executes normal control, which will be described in detail later (step S32). On the other hand, when the terminal disconnection signal TF is recorded (step S31: Yes), the ECU 17 performs discharge control, which will be described in detail later, on the reconnected battery 13 (step S32). When the discharge control in step S33 is completed, the ECU 17 proceeds to step S32 and executes normal control.
- FIG. 6 shows a normal control procedure in the charging control to the battery 13.
- the ECU 17 first determines whether or not the process has shifted from the discharge control (step S41). If the process has shifted from the discharge control (Yes), the ECU 17 proceeds to step S47 described later. On the other hand, when it is not from the transition from the discharge control (No), that is, when the internal combustion engine 11 is started and the control is started in the absence of the terminal detachment signal TF, the ECU 17 starts charging the battery 13. (Step S42). The ECU 17 continues charging until a predetermined determination time Tr elapses from the start of charging and the determination in step S43 becomes Yes, that is, until the storage state determination unit 22 determines the storage state SOC.
- step S43: Yes the ECU 17 determines whether or not the determined storage state SOC is 77% or more (step S44). If the state of charge SOC is 77% or more (step S44: Yes), the ECU 17 stops charging the battery 13 (step S45).
- step S44 when the determined storage state SOC is less than 77% in step S44 (No), the ECU 17 is corrected to the determined storage state SOC value or substantially the same value as the storage state SOC value. Therefore, the charging is continued until the recognized power storage state SOCr held as it is reaches 80%.
- step S46: Yes the ECU 17 stops charging the battery 13 (step S45).
- step S47 determines whether or not the recognized power storage state SOCr is less than the lower limit of 77% (step S47). If the ECU 17 executes steps S41 to S45 after the internal combustion engine 11 is started, the determination in step S47 does not become Yes. When the recognized power storage state SOCr is lowered by the subsequent discharge and the determination in step S47 becomes Yes, the ECU 17 starts charging (step S48). The ECU 17 continues charging until a predetermined determination time Tr elapses from the start of charging and the determination in step S49 becomes Yes, that is, until the storage state determination unit 22 determines the storage state SOC. When the predetermined determination time Tr has elapsed (step S49: Yes), the ECU 17 stops charging the battery 13 (step S45) and proceeds to step S57.
- step S51 determines whether or not the recognized power storage state SOCr is less than 80% (step S51).
- step S51 determines whether or not the fuel cut signal FC is input to the ECU 17, that is, the vehicle 1 is fuel cut. It is determined whether or not traveling has started (step S52).
- step S52 determines whether or not traveling has started (step S52).
- step S54 determines whether or not the fuel cut signal FC has been input, that is, whether or not the automobile 1 has finished the fuel cut travel (step S54). (Yes), charging is stopped (step S55). If the fuel cut signal FC does not disappear (step S54: No), the ECU 17 determines whether or not the recognized storage state SOCr is 100% or more (step S56), and the recognized storage state SOCr is 80% or more. Charging is continued while repeating the determinations of step S54 and step S55 until it becomes. If the fuel cut traveling of the automobile 1 continues and the fuel cut signal FC is not input (step S54: No), and the recognized storage state SOCr becomes 100% or more (step S56: Yes), the ECU 17 proceeds to step S55. Proceed to stop charging and proceed to step S57.
- step S57 If the recognized storage state SOCr is 80% or more in step S51 (No), and the recognized storage state SOCr is less than 80% in step S51 (Yes), the fuel cut signal FC is not input. If the determination is No, the ECU 17 proceeds to step S57.
- step S57 the ECU 17 determines whether or not the internal combustion engine 11 is stopped. When the engine is stopped (Yes), the process is terminated. If the internal combustion engine 11 is not stopped and the determination in step S57 is No, the ECU 17 repeats the process of step S47. That is, charging is performed when fuel cut traveling is performed in a state where the recognized power storage state SOCr is 77% or more which is the lower limit value, or the recognized power storage state SOCr is less than 77% without performing fuel cut traveling. Sometimes, the process of forcibly charging is continued in order to maintain the recognized power storage state SOCr upper limit value of 80%.
- FIG. 6 shows a discharge control procedure in the charge control for the battery 13.
- the ECU 17 first starts charging the battery 13 (step S61).
- the ECU 17 continues charging until a predetermined determination time Tr elapses from the start of charging and the determination in step S62 becomes Yes, that is, until the storage state determination unit 22 determines the storage state SOC.
- the predetermined determination time Tr has elapsed (step S62: Yes)
- the ECU 17 determines whether or not the determined storage state SOC is 80% or more (step S63).
- the storage state SOC is less than 80% (step S63: No)
- the ECU 17 determines whether or not the determined storage state SOC is 77% or more (step S64). If the determined power storage state SOC is 77% or more (step S64: Yes), the ECU 17 stops charging the battery 13 (step S65) and ends the present process.
- step S64: No If the determined storage state SOC is less than 77% in step S64 (step S64: No), the ECU 17 continues charging until the recognized storage state SOCr corrected to the value of the storage state SOC reaches 80%. To do. When the recognized power storage state SOCr reaches 80% (step S66: Yes), the ECU 17 stops charging the battery 13 (step S65) and ends this process.
- step S63 when the determined storage state SOC is 80% or more (step S63: No), the ECU 17 stops charging the battery 13 (step S67). Thereafter, the ECU 17 determines whether or not the subsequent integrated charge / discharge amount IW has become -20% or less, that is, whether or not the integrated discharge / charge amount IW has reached a predetermined discharge amount (step S68). In step S68, when the integrated charge / discharge amount IW is larger than ⁇ 20% (No), the ECU 17 performs charge prohibition control, which will be described in detail later (step S69). When the charge prohibition control is completed and the completion determination of the charge prohibition control in step S70 is Yes, the ECU 17 ends this process. If the charge prohibition control is not completed (step S70: No), the ECU 17 continues the charge prohibition control in step S69 until the cumulative released charge amount IW becomes -20% or less and the determination in step S68 becomes Yes. To do.
- the ECU 17 first determines whether or not the fuel cut signal FC has been input to the ECU 17, that is, whether or not the automobile 1 has started fuel cut travel (step S71). When the fuel cut signal FC is input (step S71: Yes), the ECU 17 starts charging (step S72). Thereafter, the ECU 17 determines whether or not the fuel cut signal FC has been input, that is, whether or not the automobile 1 has finished the fuel cut travel (step S73). (Yes), the ECU 17 stops charging (step S74). In this case, the ECU 17 finishes the process and proceeds to step S70 in FIG. 7, but since the charge prohibition control has not been completed (No), the integrated charge / discharge amount IW reaches -20% and the determination in step S68 is Yes. Until it becomes, it returns to S71 of FIG. 8, and the procedure after it is repeated.
- step S73: No If the fuel cut signal FC does not disappear in step S73 (step S73: No), the ECU 17 determines that the predetermined determination time Tr has elapsed from the start of charging and the determination in step S75 becomes Yes, that is, the storage state determination. Charging is continued until unit 22 determines the state of charge SOC.
- step S75: Yes the ECU 17 stops charging (step S76), and clears (sets to 0) a first counter C1 and a second counter C2 described later (step S77). It is determined whether or not the determined storage state SOC is 80% or more (step S78).
- step S78: Yes If the determined storage state SOC is 80% or more (step S78: Yes), the ECU 17 returns to S71 and repeats the subsequent steps. On the other hand, when the determined storage state SOC is less than 80% (step S78: No), the ECU 17 determines completion of the charge prohibition control (step S79), and ends the process of the main charge prohibition control. In this case, the determination in step S70 of FIG. 7 is Yes and the discharge control is terminated, so the ECU 17 proceeds to step S41 of the normal control shown in FIG.
- step S81 the ECU 17 determines whether or not the internal combustion engine 11 is restarted by the idle stop after the idle stop signal IS is input to the ECU 17 (referred to as IS restart in this flowchart and its description) (step S81). S81). If the IS restart is not performed (step S81: No), the process is finished without passing through step S79 in FIG. 8, but the process returns to step S71 in FIG. 8 until the determination in step S68 in FIG. 7 becomes Yes. .
- Step S81 the ECU 17 adds 1 to the first counter C1 and the second counter C2 and counts up (Step S82). Thereafter, the ECU 17 determines whether or not the first counter C1 is 30 (step S82). When the first counter C1 is not 30 (less than 30) (step S83: No), the ECU 17 determines whether or not the second counter C2 is 3 (step S82). When the second counter C2 is not 3 (less than 3) (step S84: No), the ECU 17 determines whether or not the IS restart has been performed (step S85). From step S84 to step S85.
- step S86 the ECU 17 determines whether or not the fuel cut signal FC is input to the ECU 17 (step S86).
- the ECU 17 starts charging (step S87).
- step S88 determines whether or not the fuel cut signal FC is no longer input. If the fuel cut signal FC is no longer input (Yes), the ECU 17 stops charging (step S89). . If the fuel cut signal FC is not input (step S88: No), the ECU 17 determines that the predetermined determination time Tr has elapsed from the start of charging and the determination in step S90 is Yes, that is, the storage state determination unit 22 Charging is continued until the storage state SOC is determined. When the predetermined determination time Tr elapses (step S90: Yes), the ECU 17 proceeds to step S76 in FIG. 8 to stop charging, and performs the processing after step S77 described above.
- step S88 If the fuel cut signal FC is not input before the predetermined determination time Tr has elapsed from the start of charging in step S87 (step S88: Yes), the ECU 17 stops charging (step S89) and restarts IS (step S81). Alternatively, it is determined whether or not a predetermined time Td has elapsed since step S85) (step S91). Even when the fuel cut signal FC is not input in step S86 (No), the ECU 17 determines whether or not a predetermined time Td has elapsed since the IS restart (step S91). When the predetermined time Td has not elapsed since the IS restart in Step S91 (No), the ECU 17 repeats the processes after Step S85.
- step S92 the ECU 17 starts charging (step S92). Thereafter, the ECU 17 continues the charging until a predetermined determination time Tr elapses from the start of charging and the determination of step S93 becomes Yes, that is, until the storage state determination unit 22 determines the storage state SOC, and the determination time Tr (Step S93: Yes), the process proceeds to step S76 in FIG. 8 to stop the charging, and the processing after step S77 described above is performed.
- step S94 the ECU 17 clears the second counter C2 (step S94) and proceeds to step S92.
- the ECU 17 clears the first counter C1 (Step S95), and proceeds to Step S92. That is, the ECU 17 starts charging (step S92), continues charging until the storage state determination unit 22 determines the storage state SOC, and then proceeds to step S76 in FIG. 8 to stop the charging. Perform the following processing.
- the idle stop is indicated as “IS”
- the fuel cut traveling is indicated as “FC”.
- the symbol “t” at time t is omitted, and only the identification number is described.
- FIG. 10A shows control for performing discharge control according to the present invention
- FIG. 10B shows control of a comparative example to which the technique of Patent Document 2 is applied.
- the correction of the recognized storage state SOCr to the determined value in the calibration based on at least the charging current Ic is described as “correction”.
- the charging control unit 26 performs a predetermined determination time Tr (from time t1 to time t1).
- the storage state calculation unit 21 determines at least the storage state SOC and calibrates the recognized storage state SOCr based on the charging current Ic.
- the state of charge SOC is regarded as 80% of the upper limit value, and the recognized state of charge SOCr is corrected to 80%.
- the actual state of charge SOCa of the battery 13 that is the determination target is 100. %. Note that when the actual storage state SOCa before charging is 100, the charging current Ic does not flow, so the recognized storage state SOCr does not increase, but here the recognized storage state SOCr increases to clarify the correction. As shown.
- the state of charge SOC is determined from time t5 to time t6 by charging the battery 13 after the internal combustion engine 11 is restarted by idle stop. At time t6, the recognized power storage state SOCr is corrected.
- the charging control unit 26 of the ECU 17 prohibits charging the battery 13 after the engine is restarted due to idle stop. The storage state SOCa is lowered.
- the charge control unit 26 charges the battery 13 in both the discharge control of the present invention (A) and the control of the comparative example (B).
- the correction of the state of charge SOCr is performed only in (A) where the discharge control of the present invention is performed.
- the correction of the recognized power storage state SOCr is performed for the first time at time t8, so that the actual power storage state SOCa is further reduced as compared with (B).
- both storage state SOCs start to decrease from time t12 when the recognized storage state SOCr is corrected to the upper limit value.
- the integrated charge / discharge amount IW (corresponding to the amount of change in the actual storage state SOCa) of the battery 13 that does not take into account the correction from time t2 corrected after battery replacement is predetermined Since the discharge amount ( ⁇ 20%) has not been reached, the discharge control is continued, and the battery 13 is not charged even after the idle stop from time t10 to time t11. Therefore, the actual power storage state SOCa in (A) is further lowered than the actual power storage state SOCa in (B).
- the predetermined time Td from the time t11 of the engine restart by the idle stop from the time t10 to the time t11 is Since fuel cut traveling is not performed before the time elapses, charging of the battery 13 is forcibly performed at time t13, and the recognized storage state SOCr is corrected at time t14. Thereafter, when fuel cut traveling is performed from time t15 to time t16, both the batteries 13A and 13B are charged. However, since the charging is less than the required determination time Tr, the recognized power storage state The SOCr is not corrected.
- the charging control unit 26 performs a predetermined determination time Tr (time t17 to time t1).
- the recognized storage state SOCr based on at least the charging current Ic is corrected.
- the recognized storage state SOCr and the actual storage state SOCa both decrease from time t18, and at (A), at time t19, the integrated charge / discharge amount IW of the battery 13 after the battery replacement becomes a predetermined discharge amount ( ⁇ 20%).
- the actual storage state SOCa becomes 80% or less. Therefore, at this time t19, the charge control unit 26 ends the discharge control and starts the normal control.
- the control of the comparative example is continued.
- both the (A) and (B) are charged to the battery 13.
- the determination of the storage state SOC is performed, but since the determined storage state SOC is 80% and the recognized storage state SOCr at this time is 80% or more, the recognized storage state SOCr No correction is made.
- (B) charging of the battery 13 and determination of the state of charge SOC are performed from time t21 to time t22 when the idle stop ends. Since the charged storage state SOC is 80% and the recognized storage state SOCr is 80% or more, the recognized storage state SOCr is not corrected at time t22.
- the charging control unit 26 performs the operation until the time t19 when the accumulated discharge amount IW reaches a predetermined discharge amount ( ⁇ 20%).
- the state of charge SOC determined at the time t2 immediately after the start of the internal combustion engine 11 and the recognized state of charge calibrated based on the state of charge Only when the state SOCr is 80% or more of the upper limit value, the charge control unit 26 performs the charge prohibition control (FIGS. 8 and 9) to prohibit the charging of the battery 13 after the engine is restarted due to the idle stop.
- the charge prohibition control FGS. 8 and 9
- the storage state calculation is performed when charging the battery 13 during fuel cut traveling (step S72, time t7 to time t8).
- the unit 21 calibrates the recognized storage state SOCr using a value determined based on at least the charging current Ic, so that the recognized storage state SOCr is calibrated to a more correct value even during the discharge control. Further, since the recognized storage state SOCr is calibrated during charging during fuel cut traveling, it is not necessary to use fuel for calibration, and fuel consumption is prevented from deteriorating.
- FIG. 11 does not show the actual power storage state SOCa
- the actual power storage state SOCa maintains 80% or more of the upper limit value, and the actual power storage state SOCa reaches the upper limit value.
- the duration time is shorter than the required determination time Tr, The case where forced calibration is performed when the recognized power storage state SOCr cannot be calibrated is shown.
- the ignition on signal IG-ON is input to start the internal combustion engine 11, and the automobile 1 starts to travel and the vehicle speed starts to increase.
- the instruction voltage for the AC generator 14 is 14.5 V (that is, the battery 13 is charged).
- the recognized storage state SOCr is calibrated, the recognized storage state SOCr is corrected to the upper limit value, and the instruction voltage is set to 12.0 V (that is, the battery 13 is not charged).
- the recognized storage state SOCr decreases from time t32 to time t33, and fuel cut running is performed from time t33 to time t34, whereby the command voltage is set to 14.5 V and the battery 13 is charged.
- the storage state SOCr is not calibrated.
- the idle stop is performed again from time t43 to time t44, and the internal combustion engine 11 is restarted at time t44.
- the vehicle 1 does not perform fuel cut traveling at time t45 before the predetermined time Td elapses.
- the forced calibration is not performed because it has stopped and shifted to the idle stop.
- the internal combustion engine 11 is restarted, fuel cut traveling is performed from time t47 to time t48 before the predetermined time Td has elapsed from time t46, and the battery 13 is charged during this time. Calibration was not performed because it was not continued over time Tr.
- the battery 13 is forcibly charged over the required determination time Tr and the storage state SOC is determined based on at least the charging current Ic, and is recognized at the time t50.
- the storage state SOCr is calibrated.
- the predetermined time Td is When the charging control unit 26 forcibly charges the battery 13 at the elapsed time t41, a state in which the recognized power storage state SOCr cannot be calibrated is prevented from continuing for a long time from the restart time t40 due to idle stop. . Therefore, the recognized power storage state SOCr does not decrease too much while leaving the actual power storage state SOCa.
- the storage state calculation unit 21 can calibrate the recognized storage state SOCr.
- FIG. 13 shows a comparative example in the case where the control of the technique of Patent Document 2 is performed without performing the discharge control of the present invention. The operation in this case will also be described.
- the vehicle shifts to idle stop, and the recognized power storage state SOCr decreases during idle stop.
- the internal combustion engine 11 is restarted by idle stop at time t76, charging of the battery 13 is started, and the recognized power storage state SOCr is calibrated at time t77.
- the recognized power storage state SOCr is corrected to the upper limit again.
- fuel cut traveling is performed from time t78 to time t79, the battery 13 is charged again. At this time, the recognized power storage state SOCr is not calibrated.
- the actual power storage state SOCa is not shown, but in this example, after the battery is replaced, the actual power storage state SOCa maintains 80% or more of the upper limit value, and the actual power storage state SOCa reaches the upper limit value. In the meantime, fuel cut traveling is not performed between the idle stop and the next idle stop, or even if fuel cut traveling is performed, the duration is shorter than the required determination time Tr, and the recognized storage state SOCr is calibrated This shows a case where forced charging is performed when it is not possible.
- the ignition on signal IG-ON is input to start the internal combustion engine 11, and the automobile 1 starts to travel and the vehicle speed starts to increase.
- the instruction voltage for the AC generator 14 is 14.5 V (that is, the battery 13 is charged).
- the recognized storage state SOCr is calibrated, the recognized storage state SOCr is corrected to the upper limit value, and the instruction voltage is set to 12.0 V (that is, the battery 13 is not charged).
- the recognized storage state SOCr decreases from time t52 to time t53, and fuel cut travel is performed from time t53 to time t54, whereby the command voltage is set to 14.5V and the battery 13 is charged.
- the storage state SOCr is not calibrated.
- the automobile 1 stops, and the first idle stop is performed from time t55 to time t56. Even when the internal combustion engine 11 is restarted by idle stop at time t56, the battery 13 is not charged because the charge control unit 26 performs discharge control. Fuel cut travel is performed from time t57 to time t58, and the battery 13 is charged during this period. However, since the duration is shorter than the determination time Tr of the storage state SOC, the recognized storage state SOCr is calibrated. Absent.
- the second idle stop is performed from time t59 to time t60, and the internal combustion engine 11 is restarted at time t60, but charging is not performed because the battery 13 is prohibited from charging.
- fuel cut travel is not performed.
- a third idle stop is performed from time t62 to time t63. Before the time point t63 at which the third idle stop is performed, the fuel cut traveling is performed from the time t57 to the time t58, but the fuel cut traveling that continues for the determination time Tr is not performed.
- the charge control unit 26 forcibly charges the battery 13, so that the recognized storage state SOCr reaches the discharge lower limit value during the idle stop, forcibly. Occurrence of a situation in which the engine suddenly starts to charge the secondary battery is suppressed. Further, the recognized storage state SOCr can be calibrated by the storage state calculation unit 21 before the recognized storage state SOCr reaches the discharge lower limit value.
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Abstract
Description
10 充電制御装置
11 内燃機関
13 バッテリ(二次電池)
14 交流発電機
15a 電流センサ(放電電流検出手段)
15b 電流センサ(充電電流検出手段)
16 電圧センサ(端子外れ検出手段)
17 ECU
22 蓄電状態判定部(蓄電状態判定手段)
23 放充電量積算部(放充電量積算手段)
24 蓄電状態認識部(蓄電状態認識手段)
25 端子外れ検出部(端子外れ検出手段)
26 充電制御部
FC フューエルカット信号
IS アイドルストップ信号
IW 積算放充電量
Ic 充電電流
SOC 蓄電状態
Claims (7)
- エンジンにより駆動される発電機から二次電池への充電を制御する充電制御装置であって、
前記二次電池への充電電流を検出する充電電流検出手段と、
前記二次電池からの放電電流を検出する放電電流検出手段と、
前記充電電流及び前記放電電流に基づいて前記二次電池の積算放充電量を算出する放充電量積算手段と、
前記積算放充電量に基づく前記二次電池の蓄電状態を認識蓄電状態として認識する蓄電状態認識手段と、
前記認識蓄電状態を満充電状態よりも小さな所定の上限値に維持するように、前記発電機の発電電圧を切り替えて前記二次電池への充電を制御する充電制御手段と、
前記二次電池の端子が外されたことを検出する端子外れ検出手段とを備え、
前記充電制御手段は、前記二次電池の端子が外されたことが検出された場合には、その時点からの前記積算放充電量が所定の放電量に達するまで、その後に再接続された二次電池への充電を禁止することを特徴とする充電制御装置。 - 前記二次電池への充電中に前記充電電流に基づいて前記二次電池の蓄電状態を判定する蓄電状態判定手段を更に備え、
前記蓄電状態認識手段は、前記蓄電状態判定手段により判定された蓄電状態に基づいて前記認識蓄電状態を較正し、
前記充電制御手段は、前記エンジンの始動直後に、前記蓄電状態判定手段による蓄電状態の判定に要する所定の判定時間にわたって前記二次電池への充電を行い、
前記二次電池の端子が外されたことが検出された場合、前記充電制御手段は、前記エンジンの始動直後に判定された前記再接続された二次電池の蓄電状態が前記上限値以上である場合にのみ、前記再接続された二次電池への充電を禁止することを特徴とする請求項1に記載の充電制御装置。 - 当該充電制御装置は車両に搭載され、
前記充電制御手段は、前記車両のフューエルカット走行中に前記二次電池への充電を行い、
前記二次電池の端子が外されたことが検出された場合、前記蓄電状態認識手段は、前記フューエルカット走行中の充電時に、前記蓄電状態判定手段により判定された前記再接続された二次電池の蓄電状態を用いて前記認識蓄電状態を較正することを特徴とする請求項2に記載の充電制御装置。 - 当該充電制御装置はアイドルストップを行う車両に搭載され、
前記二次電池の端子が外されたことが検出され、かつ、前記アイドルストップによるエンジン再始動時から所定時間が経過する前に前記フューエルカット走行が行われない場合、前記充電制御手段は前記所定の判定時間にわたって前記再接続された二次電池への充電を強制的に行うことを特徴とする請求項3に記載の充電制御装置。 - 前記二次電池の端子が外されたことが検出され、かつ、前記アイドルストップによるエンジン再始動時から前記所定時間が経過する前に、前記所定の判定時間以上継続する前記フューエルカット走行が行われない場合、前記充電制御手段は前記再接続された二次電池への充電を前記所定の判定時間にわたって強制的に行うことを特徴とする請求項4に記載の充電制御装置。
- 前記二次電池の端子が外されたことが検出され、かつ、前記アイドルストップが所定回行われる前に、前記所定の判定時間以上継続する前記フューエルカット走行が行われない場合、前記充電制御手段は、前記所定回の前記アイドルストップによるエンジン再始動後に、前記再接続された二次電池への充電を前記所定の判定時間にわたって強制的に行うことを特徴とする請求項4又は請求項5に記載の充電制御装置。
- エンジンにより駆動される発電機から二次電池への充電を制御する充電制御方法であって、
前記二次電池への充電電流を検出する充電電流検出ステップと、
前記二次電池からの放電電流を検出する放電電流検出ステップと、
前記充電電流及び前記放電電流に基づいて前記二次電池の積算放充電量を算出する放充電量積算ステップと、
前記積算放充電量に基づいて、前記二次電池の蓄電状態を認識蓄電状態(SOCr)として認識するステップと、
前記認識蓄電状態を満充電状態よりも小さな所定の上限値に維持するように、前記発電機の発電電圧を切り替えて前記二次電池への充電を制御する充電制御ステップと、
前記二次電池の端子が外されたことを検出する端子外れ検出ステップと、
前記二次電池の端子が外されたことが検出された場合に、その時点からの前記積算放充電量が所定の放電量に達するまで、その後に再接続された二次電池への充電を禁止するステップと
を備えることを特徴とする充電制御方法。
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