WO2008149964A1 - 車両の電源装置 - Google Patents
車両の電源装置 Download PDFInfo
- Publication number
- WO2008149964A1 WO2008149964A1 PCT/JP2008/060410 JP2008060410W WO2008149964A1 WO 2008149964 A1 WO2008149964 A1 WO 2008149964A1 JP 2008060410 W JP2008060410 W JP 2008060410W WO 2008149964 A1 WO2008149964 A1 WO 2008149964A1
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- WO
- WIPO (PCT)
- Prior art keywords
- power
- current
- power storage
- converter
- charging
- Prior art date
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Classifications
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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
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- 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
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/007—Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles
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- 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
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
- B60L15/2009—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed for braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B60L50/16—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with provision for separate direct mechanical propulsion
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- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
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- 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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- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
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- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- B60L2240/00—Control parameters of input or output; Target parameters
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Definitions
- the present invention relates to a power supply device for a vehicle, and more particularly to a power supply device for a vehicle on which a plurality of power storage devices are mounted.
- Japanese Patent Application Laid-Open No. 2 00 2-1 0 5 0 2 discloses a storage battery charging / discharging device capable of simultaneously charging and discharging a plurality of storage batteries.
- the distance that can be traveled by one charge is long. Even in a hybrid vehicle equipped with an internal combustion engine, storage battery, and motor, when adopting a configuration that allows the storage battery to be charged from the outside, the distance that can be traveled without using the internal combustion engine is also long per charge. desired.
- the above method 1) has an upper limit in view of the strength of the battery cell case and the like, and it is difficult to ensure the desired capacity.
- the number of cells can be increased in series or in parallel.
- a catcher battery for driving an auxiliary machine load is usually installed in addition to a high voltage battery for driving a motor of several hundred volts.
- the voltage of the high-voltage battery is stepped down by the DC / DC converter, and the reduced voltage is used.
- An object of the present invention is to provide a power supply device for a vehicle in which a plurality of power storage devices are mounted, and the bias of charge / discharge with respect to the plurality of power storage devices is reduced.
- the present invention is a power supply device for a vehicle, and is provided between a first power storage device and a main load that are electrically parallel to the main load, and between the first power storage device and the main load.
- a path connecting the first power converter provided, the second power converter provided between the second power storage device and the main load, and the first power converter and the first power storage device Controls the third power converter that receives the current branched from above, the auxiliary load driven by the power from the third power converter, and the first to third power converters And a control device.
- the control device determines the charging current or discharging current for the first and second power storage devices reflecting the current fluctuation flowing in the trap load, and charges and discharges the determined current. Control the transducer.
- the power supply device for the vehicle further includes a charger for charging the first and second power storage devices with electric power supplied from outside the vehicle.
- the charger is connected to the first power storage device.
- the first and second power converters operate as other chargers that branch a part of the current supplied from the charger and charge the second power storage device.
- the power supply device of the vehicle further includes a current sensor that detects a charge / discharge current to the first power storage device.
- the control device temporarily stops the third power converter, and toward the third power converter based on the difference in charge / discharge current to the first power storage device before and after the stop. Calculate the branched current and correct the operation of the first and second power converters based on the branched current.
- the first power converter performs a boosting operation from the first power storage device side toward the main load side.
- the second power converter operates so that a constant current flows from the main load side to the second power storage device side.
- control device is directed to the third power converter from a path connecting the first power converter and the first power storage device when it is estimated that there is a variation in power consumption in the auxiliary load.
- the branching current is calculated.
- control device estimates that the power consumption fluctuates in the auxiliary load every time a predetermined time elapses.
- control device estimates that there is a variation in power consumption in the auxiliary load when the difference between the charging states of the first and second power storage devices exceeds a predetermined value.
- control device calculates a charging state of the first power storage device and a charging state of the second power storage device, and prevents the first to second charging states from increasing so as not to increase a difference between the charging states of the first and second power storage devices. Controls the third power converter.
- FIG. 1 is a diagram showing a main configuration of a vehicle 1 according to an embodiment of the present invention.
- FIG. 2 is a circuit diagram showing a detailed configuration of inverters 14 and 2 2 of FIG.
- FIG. 3 is a circuit diagram showing a detailed configuration of boost converters 12 A and 12 B in FIG.
- FIG. 4 is a schematic diagram for explaining the state of the power supply apparatus for a vehicle during charging t
- FIG. 5 is a flowchart for explaining the charging control executed by the control device 30 of FIG.
- FIG. 6 is a diagram for explaining the change in the charging current before and after the DC / DC converter 33 is stopped.
- FIG. 7 is an operation waveform diagram showing an example when control is performed based on the flowchart of FIG.
- FIG. 8 is a flowchart for illustrating charging control executed by control device 30 of FIG. 1 in the second embodiment.
- FIG. 9 is an operation waveform diagram showing an example when control is performed based on the flowchart of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a diagram showing a main configuration of a vehicle 1 according to an embodiment of the present invention.
- vehicle 1 includes batteries B 1 and B 2 that are power storage devices, boost converters 12 A and 12 B that are power converters, a smoothing capacitor CH, and voltage sensors 10 A and 10 B, 13, inverters 14 and 22, engine 4, motor generators MG 1 and MG 2, power split mechanism 3, and control device 30.
- the power storage device mounted on the vehicle can be charged from the outside.
- the vehicle 1 further includes a charger 6 for connecting the battery B 1 to, for example, a commercial power source 8 of AC 100V.
- the charger 6 converts alternating current into direct current, regulates the voltage, and supplies it to the battery.
- other methods such as connecting the neutral point of the stator coil of motor generators MG 1 and MG 2 to an AC power source and AC / DC conversion by combining boost converters 12A and 12B are also available. A method of functioning as a device may be used.
- Smoothing capacitor CH smoothes the voltage boosted by boost converters 12A and 12B.
- Voltage sensor 1 3 is the smoothing capacitor CH terminal voltage VH Is output to the control device 30.
- Inverter 14 converts the DC voltage applied from boost converter 12 B or 12 A into a three-phase AC voltage and outputs the same to motor generator MG 1.
- Inverter 22 converts the DC voltage applied from boost converter 1 2 B or 1 2 A into a three-phase AC voltage and outputs it to motor generator MG 2.
- the power split mechanism 3 is a mechanism that is coupled to the engine 4 and the motor generators MG 1 and MG 2 and distributes the power between them.
- the power split mechanism 3 can be a planetary gear mechanism having three rotating shafts: a sun gear, a planetary carrier, and a ring gear.
- the planetary gear mechanism if the rotation of two of the three rotating shafts is determined, the rotation of the other rotating shaft is forcibly determined.
- These three rotary shafts are connected to the rotary shafts of engine 4 and motor generators MG 1 and MG 2, respectively.
- the rotating shaft of motor generator MG2 is coupled to the wheels by a reduction gear and a differential gear (not shown). Further, a reduction gear for the rotating shaft of motor generator MG 2 may be further incorporated in power split device 3.
- Voltage sensor 1 0 A measures the voltage V 1 across the battery B 1 terminals.
- a current sensor 1 1 A for detecting a current I 1 flowing through the battery B 1 is provided.
- a SOC detection unit 37 that detects the state of charge (SOC) of the battery B1 is provided.
- 5 0 0 detector 3 7 calculates the state of charge based on the open-circuit voltage of battery B 1 and the integration of current I 1 flowing through battery B 1, and outputs it to control device 30.
- the battery B1 for example, a secondary battery such as a lead storage battery, a nickel metal hydride battery, or a lithium ion battery, or a large capacity capacitor such as an electric double layer capacitor can be used.
- Voltage sensor 1 0 B measures the voltage V 2 across the battery B 2 terminals. Voltage sensor 1 0 B measures the voltage V 2 across battery B 2 terminals. In order to monitor the charging state of the battery B 2 together with the voltage sensor 10 0 B, a current sensor 11 B that detects a current I 2 flowing through the battery B 2 is provided. Also, a SOC detection unit 39 for detecting the charging state SOC 2 of the battery B 2 is provided. SOC detection unit 39 is charged based on the open circuit voltage of battery B 2 and the integration of current I 2 flowing through battery B 2. Calculate the power status and output it to the controller 30. As the battery B2, for example, a secondary battery such as a lead storage battery, a nickel metal hydride battery, or a lithium ion battery, or a large-capacity capacitor such as an electric double layer capacitor can be used.
- a secondary battery such as a lead storage battery, a nickel metal hydride battery, or a lithium ion battery, or a large-capacity capacitor such as
- battery B 2 and battery B 1 can output the maximum power allowed to the electrical load (inverter 2 2 and motor generator MG 2) connected to the power line by using them simultaneously. Is set to the chargeable capacity. As a result, maximum EV traveling is possible in EV (Electric Vehicle) traveling without using the engine.
- the engine 4 can be used without using the battery B 2 by using the engine 4 in addition to the battery B 1.
- Inverter 14 is connected to power line P L 2 and ground line S L 2. Inverter 14 receives the boosted voltages from boost converters 1 2 A and 1 2 B, and drives motor generator MG 1 to start engine 4, for example. Inverter 14 returns the electric power generated by motor generator MG 1 by the power transmitted from engine 4 to boost converters 1 2 A and 1 2 B. At this time, boost converters 12 A and 12 B are controlled by control device 30 so as to operate as a step-down circuit.
- Inverter 2 2 is connected in parallel to inverter 14 to power supply line P L 2 and ground line S L 2.
- Inverter 22 converts the DC voltage output from step-up converters 12 A and 12 B into a three-phase AC voltage and outputs it to motor generator MG 2 that drives the wheels.
- Inverter 22 also returns the electric power generated in motor generator MG 2 to boost converters 1 2 A and 1 2 B along with regenerative braking.
- boost converters 12 A and 12 B are controlled by control device 30 so as to operate as a step-down circuit.
- Control device 30 receives motor generators MG1, MG2 torque command values, motor current values and rotational speeds, voltages VI, V2, VH, and a start signal. Control device 30 then outputs a boost instruction, a step-down instruction, and an operation prohibition instruction to boost converter 12 B. Furthermore, control device 30 provides a drive instruction for converting the DC voltage output from boost converters 12 A, 1 • 2 B to inverter 14 into an AC voltage for driving motor generator MG 1, and motor generator MG. It outputs a regeneration instruction that converts the AC voltage generated in 1 into a DC voltage and returns it to the boost converters 12A and 12B.
- control device 30 converts inverter 22 to a drive instruction for converting a DC voltage into an AC voltage for driving motor generator MG 2, and converts an AC voltage generated by motor generator MG 2 into a DC voltage.
- a regeneration instruction to return to the boost converters 12A, 12B is output.
- auxiliary battery B 3 and a DCZDC comparator 33 for driving the auxiliary load 35 are provided.
- DC / DC converter 33 is connected to power supply line PL 1 A and ground line S L 2. During charging, a part of the charging current I c g is branched and the current I 3 is supplied to the DC / DC converter 33.
- the auxiliary load 35 includes, for example, various ECU power supplies, headlights, room lamps, power windows, horns, blinkers, and the like. These auxiliary loads must be actuated when requested to drive, so it is not usually considered to limit the operation of the auxiliary load by monitoring the current I3. There are often no current sensors to measure.
- FIG. 2 is a circuit diagram showing a detailed configuration of inverters 14 and 22 in FIG. Referring to Fig. 1 and Fig. 2, inverter 14 includes U-phase arm 15 and V-phase arm 1
- U-phase arm 15, V-phase arm 16, and W-phase arm 17 are connected in parallel between power supply line P L 2 and ground line S L 2.
- U-phase arm 15 consists of I GBT elements Q3 and Q4 connected in series between power line PL 2 and ground line SL 2, and diodes D 3 connected in parallel with 108 elements ⁇ 33 and Q 4 respectively. , D 4 and including.
- the power sword of diode D3 is connected to the collector of I GBT element Q 3, and the anode of diode D 3 is connected to the emitter of I GBT element Q 3.
- the power sword of diode D 4 is connected to the I 08 element (34 collectors, and the anode of diode D 4 is connected to the emitter of I GBT element Q 4 ′.
- the V-phase arm 16 includes I GBT elements Q5 and Q6 connected in series between the power line PL 2 and the ground line SL 2, and diodes D 5 and Q 6 connected in parallel with the 108 elements 05 and Q 6, respectively. Including D 6.
- the power sword of diode D 5 is connected to the collector of I GBT element Q 5, and the anode of diode D 5 is connected to the emitter of I 08 element 05.
- the power sword of diode D6 is connected to the collector of I GBT element Q6, and the anode of diode D6 is connected to the emitter of I GBT element Q6.
- W-phase arm 17 includes diodes D 7 and Q 8 connected in series with power line PL 2 and ground line SL 2 and diodes D 7 and Q 8 connected in parallel with 108 elements 07 and Q 8, respectively. Including D 8.
- the power sword of diode D 7 is connected to the collector of I GB T element Q 7, and the anode of diode D 7 is connected to the emitter of I GBT element Q 7.
- the power sword of the diode D 8 is connected to the collector of the I 08 element 08, and the anode of the diode D 8 is connected to the emitter of the I GBT element Q 8.
- each phase arm is connected to each phase end of each phase coil of motor generator MG1. That is, the motor generator MG 1 is a three-phase permanent magnet synchronous motor, and one end of each of the three coils of the U, V, and W phases is connected to the midpoint.
- the other end of the U-phase coil is connected to the line UL drawn from the connection node of the IGBT elements Q3 and Q4.
- the other end of the V-phase coil is connected to the line VL drawn from the connection node of I 08 element ⁇ 35, Q6.
- the other end of the W-phase coil is connected to the line WL drawn from the connection node of the IGBT elements Q7 and Q8.
- Inverter 22 in FIG. 1 is also different in that it is connected to motor generator MG2, but the internal circuit configuration is the same as that of inverter 14, and detailed description thereof will not be repeated.
- FIG. 2 shows that control signals PWM I and PWM C are given to the inverter, which are signals corresponding to the drive instruction and the regeneration instruction.
- FIG. 3 is a circuit diagram showing a detailed configuration of boost converters 12 A and 12 B of FIG. Referring to Fig. 1 and Fig. 3, boost converter 12A is connected in series between reactor 1 whose one end is connected to power line PL 1 A and power line PL 2 and ground line SL 2 IGBT elements Q1, Q2 and diodes D1, D2 connected in parallel to 108 elements ⁇ 31, Q2, respectively.
- reactor L 1 The other end of reactor L 1 is the emitter of I 08 element 01 and I 08 element (3
- the cathode of diode D 1 is connected to the I 08 element (31 collector, the anode of diode D 1 is connected to the emitter of I & 8 element 01.
- the power sword of diode D 2 is the I GBT element Q 2 Connected to the collector, the anode of diode D 2 is connected to the emitter of I GBT element Q 2.
- boost converter 12 B in Fig. 1 is connected to power line PL 1 B instead of power line PL 1 A.
- the power supply device for the vehicle includes first and second power storage devices (B1, B2) provided in parallel with the main load (14, 22), and the first power storage device (B1).
- the auxiliary power storage device (B 3), and a third power conversion that charges the auxiliary power storage device with a current I 3 branched from a path connecting the first power converter and the first power storage device Device (33), auxiliary power storage device (B 3) or auxiliary load 35 driven by power from third power converter (33), and first to third power converters (12 A, 12B, 33) is provided with a control device 30.
- the control device 30 reflects the fluctuation of the current flowing through the auxiliary load 35, and the charging current for the first and second power storage devices (B1, B2). Or discharge current Mel.
- the power supply device for the vehicle further includes a charger 6 for charging the first and second power storage devices (B1, B2) with electric power supplied from the outside of the vehicle.
- the charger 6 is connected to the first power storage device (B 1).
- First and second power converters (12 A, 12B) operates as another charger that branches a part of the current supplied from the charger 6 and charges the second power storage device (12B).
- the power supply device of the vehicle further includes a current sensor 11 A that detects a charge / discharge current to the first power storage device (B 1).
- the control device 30 temporarily stops the third power converter (33), and based on the charge / discharge current difference to the first power storage device (B 1) before the stop and after the stop,
- the current (1 3) branched toward the power converter (33) is calculated, and the operations of the first and second power converters are corrected based on the branched current.
- the first power converter (12 A) performs a step-up operation from the first power storage device (B 1) side toward the main load (14, 22) side.
- the second power converter (12 B) has a constant current (I const2) flowing from the main load side (14, 22) toward the second power storage device (B 2) side. The operation is performed as follows.
- control device 30 is configured to connect the first power converter (12A) and the first power storage device (B 1) when it is estimated that the power consumption in auxiliary load 35 has changed.
- the current I 3 branched from the top toward the third power converter (33) is calculated.
- FIG. 4 is a schematic diagram for explaining the state of the power supply device of the vehicle at the time of charging.
- the current is imitated by the flow of water.
- a charging current I c g flows from the charger 6 into a tank corresponding to the battery B 1.
- Boost converters 12 A and 12 B together operate as a charger for battery B 2, and supply current I 2 from battery B 1 side power to battery B 2 side.
- the current I 3 to the auxiliary load further flows out.
- the current I 3 is supplied to the battery B 3 by the flow regulating valve corresponding to the DC / DC converter 33, and the same amount of current I 3 is supplied from the battery B 3 to the auxiliary load.
- the power used by the auxiliary load is such that the headlight, horn, etc. are compared to the reference current determined based on the current consumption of the various ECUs activated during charging and the loss of the DCZDC converter 33. operation Depending on the demand of the person, the current for the load that operates may increase. Therefore, the current I 3 can fluctuate.
- the battery B 1 B 2 will be charged unevenly. In such a case, if the battery that has been fully charged first is stopped, the remaining batteries are fully charged, and finally both batteries B 1 and B 2 are fully charged, the state of the process is uneven. Some people think that it is okay. However, the charging time for the battery may be short for the convenience of the user, and the charging time is not necessarily given until both the batteries B 1 and B 2 are fully charged. If external charging is repeated for a short time, charging and discharging of the batteries B 1 and B 2 can be biased, and the battery life may be shortened.
- the batteries B 1 and B 2 are charged evenly even during charging.
- the charging current I cg is constant
- the battery B 2 is charged according to the change of the current I 3 supplied to the auxiliary load side.
- the current I 2 must also be varied.
- FIG. 5 is a flow chart for explaining the charging control executed by the control device 30 of FIG. The processing of this flowchart is called and executed from a predetermined main routine at regular time intervals or every time a predetermined condition is satisfied.
- step S1 when the processing of this flowchart is started, it is determined whether or not a predetermined time T has elapsed in step S1. If the predetermined time T has elapsed and V, if not, the process proceeds to step S8, and control is transferred to the main routine.
- step S 2 If it is determined in step S 1 that the predetermined time has elapsed, in step S 2, the current I 1 detected at that time by the current sensor 11 A is used as the current value I 1 A to control the controller 30 Store in memory 2 7 Thereafter, the process proceeds to step S3.
- step S 3 the control device 30 temporarily stops the D CZD C converter 33.
- the DC / DC converter 3 3 is used to supply the charging voltage to the auxiliary battery B 3 that supplies the voltage of the battery B 1 (for example, 2 0 0 V) to the auxiliary load 3 5.
- Control is performed to convert to a constant output voltage (eg, 14 V).
- the current I 3 supplied to the DC / DC converter 33 is a value reflecting the consumption current of the auxiliary load. Therefore, if the change in the charging current before and after the DC / DC converter 33 is stopped is observed, the current I 3 can be obtained without providing a current sensor for measuring the current I 3.
- FIG. 6 is a diagram for explaining the change in the charging current before and after the DC / DC converter 33 is stopped.
- the charging current I c g from the charger is a value (constant value Iconstl) determined by the limit of the capability of the charger 6 in principle.
- the charging current I 2 for the battery B 2 is a current controlled by the charger 12 for the battery B 2 constituted by the boost converters 12 A and 12 B.
- boost converter 12 A boosts, for example, the voltage of power supply line P L 1 A, for example, 200 V, and outputs the boosted voltage to power supply line P L 2.
- the voltage of the power line PL 2 is 600 V, for example.
- step-up converter 12 B operates as a step-down circuit that steps down the voltage of power supply line PL 2 (eg, 600 V) to the voltage of power supply line P L 1 B (eg, 200 V).
- a constant current control command is sent to the boost converter 12B operating as the step-down circuit, and the charging current is controlled to be a constant value I const2.
- I c g I 1+ I 2+ I 3
- step S3 the DCZDC converter 33 is connected.
- the current value I 1 measured by the current sensor 11 A in step S 4 is stored in the memory 27 as the current value I 1 B.
- step S6 the charge command value for battery B2 is
- I const2 (Iconstl— ⁇ 1) / 2 ⁇ ⁇ ⁇ (5)
- FIG. 7 is an operation waveform diagram showing an example when control is performed based on the flow chart of FIG.
- the control device 30 estimates that the power consumption fluctuates in the auxiliary load 35 every time the predetermined time T elapses. Then, the DCZDC converter 33 is temporarily stopped to measure the current consumption of the auxiliary load 35.
- the auxiliary battery B 3 When the D C ZD C converter 3 3 is stopped, the auxiliary battery B 3 is discharged in order to supply the consumption current of the auxiliary load 3 5. However, since the auxiliary battery B 3 is in a state close to ⁇ charging again after a certain time T has elapsed, the current I 3 is measured when the DC CZD C converter 3 3 is stopped next time. I 3 does not include a charging current for charging the battery B 3.
- the current I 3 is measured every certain period of time.
- the current I 3 is measured when the difference between the charging states of the batteries B 1 and B 2 exceeds a predetermined value. To correct the charging current of batteries B 1 and B 2. Since the configuration of the vehicle is as shown in Fig. 1, the description will not be repeated.
- FIG. 8 is a flowchart for illustrating charging control executed by control device 30 of FIG. 1 in the second embodiment. The process of this flowchart is called and executed from a predetermined main routine every predetermined time or every time a predetermined condition is satisfied.
- steps S 1 A and S 1 B are executed instead of step S 1 of the processing of the flowchart of FIG.
- step S 1 A the absolute value of the difference between the charging state SOC (B 1) of battery B 1 and the charging state SOC (B 2) of battery B 2 is obtained as ⁇ SOC. Then, in step S 1 B, it is determined whether ⁇ SOOC is greater than a predetermined threshold value K (%).
- step S8 If ⁇ SOC> K is not satisfied, the process proceeds to step S8, and control is transferred to the main routine. On the other hand, if ⁇ SOC> K is established, the processes of steps S 2 to S 7 are sequentially executed. Since the processing of steps S 2 to S 7 is the same as that in FIG. 5 of Embodiment 1, the description thereof will not be repeated.
- FIG. 9 is an operation waveform diagram showing an example when control is performed based on the flowchart of FIG.
- the DCZDC converter 33 Since the difference ⁇ SOC between (B 1) and the charge state SOC (B 2) of the battery B 2 does not exceed the threshold value K, the DCZDC converter 33 is set to the on state and is operating normally.
- control device 30 temporarily stops DC / DC converter 33 from time t 11 to time t 12. During this time, the charging current balance of the batteries B 1 and B 2 is corrected. In addition, the charging state difference ASO is prevented from being expanded beyond the threshold value K.
- the rate of increase in the state of charge changes between before time t12 and after time t12.
- ⁇ SOC again exceeds the threshold value K, so control device 30 temporarily stops DC / DC converter 33 until time t 13 and time t 14. During this time, the balance of the charging currents of the batteries B1 and B2 is corrected. In addition, the charging current difference ⁇ SO0 is prevented from expanding beyond the threshold value K.
- the rate of increase in the state of charge changes between before time t14 and after time t14.
- control device 30 includes the first power storage device (B
- Step S 1A and the first to third power converters (1 2A, 12 B, 33 so that the difference S SOC between the charge states of the first and second power storage devices does not increase. ) I will do it.
- the control device 30 detects the auxiliary machine when the difference ⁇ SOC between the charge states of the first and second power storage devices (B1, B2) exceeds a predetermined value K (%). It is estimated that there was a change in power consumption at loads 35. Then, change in power consumption is detected, and the command value for charging current is reset according to the result. As a result, the uneven charging of the battery can be eliminated, and the shortening of the life of only one battery can be prevented.
- a current sensor that directly measures the current I 3 may be added to the vehicle 1 in FIG. Even in this case, if the charging current is corrected every time a certain time elapses or a predetermined condition is satisfied so as to eliminate the charging current difference for the batteries B 1 and B 2, the batteries B 1 and B 2 can be charged uniformly.
- the charging current I const2 for charging the battery B 2 is corrected. Instead, the charging current I constl from the charger 6 is compensated while maintaining I const2 constant. It can be modified to increase or decrease according to fluctuations in power consumption of the machine load.
- the charging current is corrected during charging from the external power source.
- the charging current is corrected by turning the generator while driving or when charging by power generation during regenerative braking.
- the charging current may be corrected.
- a hybrid vehicle is illustrated.
- the present invention can be applied to various types of hybrid vehicles, electric vehicles, and the like.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP08765223.6A EP2154764B1 (en) | 2007-06-06 | 2008-05-30 | Power supply unit of vehicle |
CN2008800186874A CN101682202B (zh) | 2007-06-06 | 2008-05-30 | 车辆的电源装置 |
US12/451,163 US8143859B2 (en) | 2007-06-06 | 2008-05-30 | Power supply apparatus for vehicle |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2007-150720 | 2007-06-06 | ||
JP2007150720A JP4874874B2 (ja) | 2007-06-06 | 2007-06-06 | 車両の電源装置 |
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Publication Number | Publication Date |
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WO2008149964A1 true WO2008149964A1 (ja) | 2008-12-11 |
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PCT/JP2008/060410 WO2008149964A1 (ja) | 2007-06-06 | 2008-05-30 | 車両の電源装置 |
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US (1) | US8143859B2 (ja) |
EP (1) | EP2154764B1 (ja) |
JP (1) | JP4874874B2 (ja) |
CN (1) | CN101682202B (ja) |
RU (1) | RU2413352C1 (ja) |
WO (1) | WO2008149964A1 (ja) |
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Also Published As
Publication number | Publication date |
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US8143859B2 (en) | 2012-03-27 |
CN101682202A (zh) | 2010-03-24 |
CN101682202B (zh) | 2012-08-08 |
US20100141213A1 (en) | 2010-06-10 |
EP2154764A4 (en) | 2017-06-14 |
RU2413352C1 (ru) | 2011-02-27 |
EP2154764A1 (en) | 2010-02-17 |
EP2154764B1 (en) | 2019-06-26 |
JP4874874B2 (ja) | 2012-02-15 |
JP2008306823A (ja) | 2008-12-18 |
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