WO2017188163A1 - 電源制御装置 - Google Patents

電源制御装置 Download PDF

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Publication number
WO2017188163A1
WO2017188163A1 PCT/JP2017/016121 JP2017016121W WO2017188163A1 WO 2017188163 A1 WO2017188163 A1 WO 2017188163A1 JP 2017016121 W JP2017016121 W JP 2017016121W WO 2017188163 A1 WO2017188163 A1 WO 2017188163A1
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WO
WIPO (PCT)
Prior art keywords
storage battery
unit
power
switch unit
switch
Prior art date
Application number
PCT/JP2017/016121
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
片山　直樹
Original Assignee
株式会社デンソー
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Publication date
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Priority to CN201780026020.8A priority Critical patent/CN109070819A/zh
Publication of WO2017188163A1 publication Critical patent/WO2017188163A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
    • 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
    • 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
    • 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

Definitions

  • This disclosure relates to a power supply control device mounted on a vehicle or the like.
  • a power supply system including a first storage battery that is a lead storage battery, a second storage battery that is a lithium ion storage battery, and a semiconductor switch is known.
  • the semiconductor switch is provided in a connection path that electrically connects these storage batteries.
  • the power supply system further includes a generator that is electrically connected to the first storage battery side of the semiconductor switch in the connection path.
  • the second storage battery when the second storage battery is not used for a long time, the second storage battery may be in an overdischarged state due to self-discharge of the second storage battery or the like.
  • the lead storage battery can be removed from the vehicle, or can be charged by jumping a rescue vehicle or the like to start the engine.
  • a lithium ion storage battery since it is mounted as a battery pack that is an ASSY including the storage battery and peripheral circuits, there is no method for charging the storage battery from the outside, and the battery pack ASSY has to be replaced.
  • the terminal voltage of a storage battery decreases as its charge level decreases.
  • the 2nd storage battery used as the overdischarge state will be in the state in which the terminal voltage became a low state, and the terminal voltage of the 2nd storage battery fell greatly with respect to the terminal voltage of the 1st storage battery.
  • an overcurrent may flow from the first storage battery to the second storage battery. In this case, the reliability of the part where overcurrent flows in the power supply system may be reduced.
  • This disclosure is applied to a system including a first storage battery and a second storage battery, and a main object thereof is to provide a power supply control device that can avoid an overcurrent from flowing from the first storage battery to the second storage battery.
  • the first disclosure is provided in a connection path that electrically connects the first storage battery, the second storage battery, and the first storage battery and the second storage battery, and is in an electric state by being in either a closed state or an open state.
  • a first switch unit that switches between electrical conduction and interruption, and an output unit that is electrically connected to the second storage battery side of the first switch unit in the connection path, and outputs generated power from the output unit
  • a second switch that is provided closer to the second storage battery than a connection point between the generator and the output section in the connection path, and switches between electrical continuity and disconnection by being in a closed state or an open state Is applied to a system comprising:
  • the first disclosure is based on a condition that the determination unit determines whether or not the second storage battery is in an overdischarged state, and the determination unit determines that the second storage battery is in an overdischarged state.
  • a prohibiting unit that prohibits both the first switch unit and the second switch unit from being closed.
  • the prohibition unit prohibits both the first switch unit and the second switch unit from being closed on the condition that the determination unit determines that the second storage battery is in an overdischarged state. The For this reason, it is prohibited that the second storage battery and the first storage battery are electrically connected, and an overcurrent can be avoided from flowing from the first storage battery to the second storage battery. As a result, a decrease in system reliability can be avoided.
  • the first switch unit on the condition that the second storage battery is determined to be in an overdischarged state, the first switch unit can be closed and the second switch unit can be opened.
  • a 2nd storage battery can be electrically disconnected from the electrical system containing a 1st storage battery and a generator, and operation
  • movement and use of a normal electrical system can be continued among the electrical systems with which a system is equipped.
  • the battery pack further includes a charge control unit that charges the second storage battery with the generated power of the generator in a state where the two switch unit is in a closed state.
  • a second switch unit is provided on the second storage battery side of the connection path with the output unit of the generator in the connection path.
  • system further includes an electrical load electrically connected to the first storage battery side with respect to the first switch unit in the connection path.
  • the system to which the above disclosure is applied includes an electrical load that is electrically connected to the first storage battery side rather than the first switch unit in the connection path. For this reason, even if it is a case where the 1st switch part is made into an open state at the time of charge of the 2nd storage battery determined to be an overdischarge state, it replaces with a 2nd storage battery or a generator, and from the 1st storage battery. Power can be supplied to the electrical load. Therefore, it is possible to charge the second storage battery while securing the power supplied to the electric load.
  • the generator is configured such that the output voltage of the output unit can be adjusted, and the charging control unit gradually increases the output voltage of the output unit during charging of the second storage battery. It is something to be made.
  • the output voltage of the output unit is gradually increased. This is because when the second storage battery is in an overdischarged state, an overcurrent does not flow from the output of the generator to the second storage battery due to the difference between the terminal voltage of the second storage battery and the terminal voltage of the first storage battery. It is to do.
  • the output voltage of the output unit of the generator is low, and the voltage of the electrical system including the generator and the second storage battery is low.
  • the electrical system including the generator and the second storage battery can be less than the lowest voltage that can guarantee the operation of the electrical load.
  • the electrical load is electrically connected to the first storage battery side with respect to the first switch portion in the connection path.
  • the 1st switch part is made into an open state, and electric power is supplied from the 1st storage battery to an electric load.
  • the operation of the electric load can be guaranteed when the second storage battery is charged.
  • the power generator includes a power generation control unit that adjusts an output voltage of the output unit based on an output voltage command value of the output unit instructed by the charge control unit by being supplied with power.
  • the power generation control unit is supplied with power from the first storage battery.
  • the output voltage of the output section is gradually increased based on the output voltage command value when the second storage battery is charged.
  • the voltage of the electrical system including the generator and the second storage battery causes the operation of the power generation control unit. It can be below the minimum voltage that can be guaranteed. In this case, there is a concern that the output voltage of the output unit cannot be adjusted. In order to cope with this problem, it is conceivable to increase the output voltage of the output unit. In this case, however, an overcurrent may flow from the output portion of the generator to the second storage battery.
  • the system includes an engine, the generator generates power when power is supplied from the engine, and the generator is supplied with power, A power generation control unit that adjusts an output voltage of the output unit based on an output voltage command value of the output unit that is instructed by the charge control unit; and the engine is driven by the power generation control unit. In this state, electric power is supplied from the generator.
  • the power of the power generation control unit can be covered by the power generated by the generator while the engine is driven.
  • the charge control unit determines that the charge amount of the first storage battery is below a lower limit value of an appropriate range
  • the first switch unit is closed prior to charging the second storage battery.
  • the first storage battery is charged with the generated power of the generator in a state where the second switch unit is in an open state.
  • the first switch unit When it is determined that the charge amount of the first storage battery is below the lower limit value of the appropriate range, the first switch unit is closed and the second switch is set prior to charging the second storage battery.
  • the first storage battery is charged by the power generated by the generator with the switch portion in the open state. Then, the second storage battery is charged. For this reason, it is possible to avoid a shortage of power supplied from the first storage battery to the electric load during charging of the second storage battery.
  • the charge control unit determines that the charge amount of the first storage battery falls below a lower limit value of an appropriate range during charging of the second storage battery
  • the first switch unit is switched to a closed state.
  • the first storage battery is charged with the generated power of the generator while the second switch unit is switched to the open state.
  • the charge amount of the first storage battery becomes insufficient during charging of the second storage battery, The power supplied to the electrical load may be insufficient.
  • the first switch unit when it is determined that the charge amount of the first storage battery falls below the lower limit value of the appropriate range during charging of the second storage battery, the first switch unit is switched to the closed state and the second switch unit Is switched to the open state. In this state, the first storage battery is charged with the power generated by the generator. For this reason, it is possible to avoid a shortage of power supplied from the first storage battery to the electric load during charging of the second storage battery.
  • FIG. 1 is an overall configuration diagram of an in-vehicle power supply system.
  • FIG. 2 is a flowchart showing the procedure of the charging process.
  • FIG. 3 is a time chart showing the charging process when the charge amount of the lead storage battery is sufficient,
  • FIG. 4 is a time chart showing the charging process when the charge amount of the lead storage battery is insufficient.
  • a vehicle on which the power supply control device of this embodiment is mounted travels using an engine as a drive source and has a so-called idling stop function.
  • the in-vehicle power supply system includes a rotating electrical machine 10, a lead storage battery 11 as a first storage battery, a lithium ion storage battery 12 as a second storage battery, a starter 13, and various electric loads 14.
  • the lead storage battery 11 is a well-known general-purpose storage battery.
  • the lithium ion storage battery 12 is a high-performance storage battery that has higher output density and energy density than the lead storage battery 11 and has high resistance to frequent charging and discharging.
  • the lead storage battery 11 has a storage capacity larger than that of the lithium ion storage battery 12.
  • the rated voltage of the lead storage battery 11 is the same as or substantially the same as the rated voltage of the lithium ion storage battery 12.
  • the positive electrode of the lithium ion storage battery 12 is connected to the positive electrode of the lead storage battery 11 via the connection path LD.
  • the negative electrodes of the lead storage battery 11 and the lithium ion storage battery 12 are grounded.
  • the rotating electrical machine 10 has a power generation unit 10a, a power generation control unit 10b, and an output unit 10c that outputs the generated power of the power generation unit 10a.
  • the power generation unit 10a includes a stator, a stator coil wound around the stator, a rotor, and a rotor coil wound around the rotor.
  • the rotation shaft of the rotor is connected to the output shaft 20a of the engine 20 by a belt or the like.
  • the rotating electrical machine 10 functions as a generator that generates power by rotating the output shaft 20a or the axle.
  • the rotor is rotated by the power supplied from the output shaft 20a.
  • the power generation unit 10a an alternating current is induced in the stator coil in accordance with the exciting current flowing in the rotor coil under a situation where the rotor rotates, and is converted into a direct current by a rectifier (not shown).
  • the excitation current flowing through the rotor coil is adjusted by the power generation control unit 10b, so that the generated DC voltage is adjusted to the output voltage command value Vref. That is, the power generation control unit 10b controls the generated power output from the output unit 10c to the output voltage command value Vref. Power is supplied from the lead storage battery 11 to the power generation control unit 10b.
  • the power supply system includes a first switch unit SW1 and a second switch unit SW2.
  • the first switch unit SW1 is a semiconductor switch that is provided in the connection path LD and switches between electrical continuity and disconnection when in either the closed state or the open state.
  • the first switch unit SW1 is configured by a pair of N-channel MOSFETs whose sources are connected to each other.
  • connection path LD the output unit 10c is electrically connected to the lithium ion storage battery 12 side of the first switch unit SW1.
  • a second switch unit SW2 that is a semiconductor switch is provided closer to the lithium ion storage battery 12 than the connection point N with the output unit 10c.
  • the second switch unit SW2 is configured by a pair of N-channel MOSFETs whose sources are connected to each other.
  • a starter 13 is connected in parallel to the lead storage battery 11.
  • the starter 13 performs cranking for applying an initial rotation to the output shaft 20 a of the engine 20 when electric power is supplied from the lead storage battery 11.
  • the electric load 14 is connected to the lead storage battery 11 in parallel.
  • the electric load 14 includes a constant voltage required load that is required to be stable so that the voltage of the supplied power is substantially constant or varies at least within a predetermined range.
  • Specific examples of the constant voltage required load include a navigation device, a headlight, and a blower fan of an air conditioner.
  • the power supply system includes a first voltage detection unit 30 that detects a terminal voltage of the lead storage battery 11 and a first current detection unit 31 that detects a charge / discharge current flowing through the lead storage battery 11.
  • the power supply system includes a second voltage detection unit 32 that detects a terminal voltage of the lithium ion storage battery 12 and a second current detection unit 33 that detects a charge / discharge current flowing through the lithium ion storage battery 12.
  • the detection value of each detection unit is input to the control device 40 provided in the power supply system.
  • the control device 40 does not overcharge / discharge the start control of the engine 20, the power generation control for outputting the output voltage command value Vref to the power generation control unit 10b, and the charge rate (SOC) of the lead storage battery 11 and the lithium ion storage battery 12.
  • Charge / discharge control is performed so as to adjust to an appropriate range.
  • the appropriate range of the lead storage battery 11 is set to a predetermined range from the central value, specifically, for example, set to 90% ⁇ 2%. Further, the appropriate range of the lithium ion storage battery 12 is specifically set to 30 to 80%, for example.
  • the start control of the engine 20 includes restart control of the engine 20 by idling stop control in addition to the initial start control of the engine 20 in which the vehicle user's ignition switch ON operation is input.
  • the idling stop control is to automatically stop the engine 20 when a predetermined automatic stop condition is satisfied, and to restart the engine 20 when the predetermined restart condition is satisfied under the automatic stop state.
  • control device is provided individually corresponding to each component of the in-vehicle system such as the engine 20.
  • the point that the control devices are individually provided is not a main part, and for convenience, these control devices are illustrated as a single control device 40.
  • the vehicle may be left for a long time, and the lithium ion storage battery 12 may not be used for a long time.
  • the charge rate of the lithium ion storage battery 12 becomes close to the lower limit value of the appropriate range due to self-discharge of the lithium ion storage battery 12 or supply of dark current to a device electrically connected to the lithium ion storage battery 12.
  • the lithium ion storage battery 12 in an overdischarged state is in a state where the terminal voltage is low, and the degree of decrease in the terminal voltage of the lithium ion storage battery 12 relative to the terminal voltage of the lead storage battery 11 can be large.
  • Fig. 2 shows the procedure of the above charging process. This process is repeatedly executed by the control device 40 at a predetermined cycle, for example.
  • step S10 it is first determined in step S10 whether or not the ignition switch is turned on. If it is determined in step S10 that it is turned on, the process proceeds to step S12 to determine whether or not the value of the determination flag F is zero. The initial value of the determination flag F is set to 0.
  • step S12 If it is determined in step S12 that the value of the determination flag F is 0, the process proceeds to step S14, where the first switch unit SW1 is closed and the second switch unit SW2 is opened.
  • step S16 it is determined whether or not the engine 20 has been started.
  • a method for determining completion of starting of the engine 20 for example, a method of determining that the starting is completed when it is determined that the rotation speed of the output shaft 20a is equal to or higher than a predetermined rotation speed may be employed.
  • the rotating electrical machine 10 can generate power with the power supplied from the output shaft 20a of the engine 20.
  • the power generated by the rotating electrical machine 10 is directly supplied to the power generation control unit 10b while the engine 20 is being driven. Thereby, the electric power which should be supplied to the electric power generation control part 10b can be covered with the electric power generated of the rotary electric machine 10.
  • step S18 it is determined whether or not the lithium ion storage battery 12 is in an overdischarged state. In this embodiment, when it determines with the terminal voltage VLi of the lithium ion storage battery 12 detected by the 2nd voltage detection part 32 being less than 1st determination value Vth1, it determines with the lithium ion storage battery 12 being an overdischarge state. .
  • the first determination value Vth1 is set to the lower limit value of the appropriate range of the terminal voltage of the lithium ion storage battery 12.
  • the process of step S18 corresponds to a determination unit.
  • step S18 When the process of step S18 is first performed after the process shown in FIG. 2 is started, the second switch unit SW2 is opened and the lithium ion storage battery 12 is disconnected from the connection point N. At this time, when it is determined that the open-circuit voltage of the lithium ion storage battery 12 is equal to or lower than a predetermined value (for example, 10 V), the lithium ion storage battery 12 may be determined to be in an overdischarged state.
  • a predetermined value for example, 10 V
  • step S18 If it is determined in step S18 that it is not in an overdischarged state, the process proceeds to step S20 and permits the first switch unit SW1 and the second switch unit SW2 to be simultaneously closed.
  • the first switch unit SW1 and the second switch unit SW2 are in the closed state, when the rotating electrical machine 10 generates power, the generated power is supplied to the lead storage battery 11, the lithium ion storage battery 12, and the electrical load 14. .
  • step S22 the value of the determination flag F is set to 1.
  • step S18 determines whether the battery is in an overdischarged state. If it is determined in step S18 that the battery is in an overdischarged state, the process proceeds to step S24 to prohibit the first switch unit SW1 and the second switch unit SW2 from being closed simultaneously.
  • the process in step S24 corresponds to a prohibition unit.
  • step S26 it is determined whether or not the lead storage battery 11 has deteriorated. If it is determined in step S26 that the battery has deteriorated, it is desirable to perform a process of notifying the user of the deterioration by turning on a failure warning lamp or the like.
  • step S26 If it is determined in step S26 that the battery has not deteriorated, the process proceeds to step S28, where it is determined whether the charge amount of the lead storage battery 11 is sufficient.
  • the second determination value Vth2 is set to the lower limit value of the appropriate range of the terminal voltage of the lead storage battery 11.
  • the said lower limit of the lead storage battery 11 is 12.5V, for example.
  • the charge amount of the lead storage battery 11 is determined to be sufficient.
  • a predetermined current for example, 5 A
  • Vth3 for example, 14 V
  • the charge amount of the lead storage battery 11 is determined to be sufficient.
  • step S28 If it is determined in step S28 that the charge amount of the lead storage battery 11 is sufficient, the process proceeds to step S30, where the first switch unit SW1 is opened and the second switch unit SW2 is closed.
  • the lithium ion storage battery 12 is charged with the generated power output from the output unit 10c of the rotating electrical machine 10.
  • a process of gradually increasing the output voltage command value Vref is performed until the output voltage command value Vref reaches a specified value.
  • the said prescribed value is set to the value higher than the rated voltage of the lithium ion storage battery 12 and the lead storage battery 11, for example.
  • step S36 it is determined whether or not the terminal voltage VPb of the lead storage battery 11 is equal to or higher than the third determination value Vth3. If an affirmative determination is made in step S40, the process proceeds to step S42, and the value of the determination flag F is set to zero.
  • FIG. 3 (a) shows the transition of the operation state of the ignition switch
  • FIG. 3 (b) shows the transition of the operating state of the starter 13
  • FIG. 3 (c) shows the transition of the operating state of the engine 20.
  • FIGS. 3D and 3E show the transition of the operation state of the first and second switch units SW1 and SW2
  • FIG. 3F shows the terminals of the lithium ion storage battery 12 detected by the second voltage detection unit 32. The transition of the voltage VLi is shown.
  • the first switch unit SW1 when the ignition switch is turned on at time t1, the first switch unit SW1 is switched from the open state to the closed state. Thereafter, initial rotation is applied to the output shaft 20a of the engine 20 by the starter 13, and combustion control of the engine 20 is started, so that it is determined that the start of the engine 20 is completed at time t2.
  • the lead storage battery 11 has a storage amount necessary for driving the starter 13 when the engine 20 is started.
  • the first switch unit SW1 and the second switch unit SW2 are both closed before the first switch unit SW1 is closed. It is prohibited that both the switch unit SW1 and the second switch unit SW2 are closed.
  • the first switch unit SW1 is switched from the closed state to the open state, and the second switch unit SW2 is switched from the open state to the closed state.
  • charging of the lithium ion storage battery 12 is started by the electric power generated by the rotating electrical machine 10.
  • the lithium ion storage battery 12 it is determined that the terminal voltage VLi of the lithium ion storage battery 12 has reached the first determination value Vth1 at time t4. For this reason, it is determined that the overdischarge state of the lithium ion storage battery 12 has been eliminated, and it is permitted that both the first switch unit SW1 and the second switch unit SW2 are closed. Thereby, 1st switch part SW1 is switched to a closed state.
  • FIG. 4 (a) to 4 (e) and 4 (g) correspond to FIG. 3 (a) to (f)
  • FIG. 4 (f) shows the lead detected by the first voltage detector 30.
  • the transition of the terminal voltage VPb of the storage battery 11 is shown.
  • FIG. 4F illustration of a decrease in the terminal voltage VPb due to driving of the starter 13 is omitted.
  • the lithium ion storage battery 12 is in an overdischarged state after time t2. Thereafter, prior to charging of the lithium ion storage battery 12, charging of the lead storage battery 11 is started by power generated by the rotating electrical machine 10 at time t3. It is determined by charging of the lead storage battery 11 that the terminal voltage VPb of the lead storage battery 11 has reached the third determination value Vth3 at time t4. Thereafter, it is determined that the charge amount of the lead storage battery 11 is sufficient. Then, charging of the lithium ion storage battery 12 is started by the generated power of the rotating electrical machine 10 in a state where the first switch unit SW1 is switched to the open state and the second switch unit SW2 is switched to the closed state.
  • VPb can be less than the second determination value Vth2.
  • step S ⁇ b> 28 when it is determined in step S ⁇ b> 28 that the terminal voltage VPb of the lead storage battery 11 has become less than the second determination value Vth ⁇ b> 2 during the charging of the lithium ion storage battery 12, step S ⁇ b> 36.
  • the first switch unit SW1 is switched to the closed state and the second switch unit SW2 is switched to the open state.
  • the lead storage battery 11 is charged with the power generated by the rotating electrical machine 10, and then the charging of the lithium ion storage battery 12 is started again. For this reason, it is possible to avoid a shortage of power supplied from the lead storage battery 11 to the electric load 14 during charging of the lithium ion storage battery 12.
  • both the first switch unit SW1 and the second switch unit SW2 were prohibited from being closed. For this reason, it can avoid that an overcurrent flows from the lead storage battery 11 to the lithium ion storage battery 12 determined to be in an overdischarged state. Thereby, the fall of the reliability of a power supply system can be avoided.
  • the lithium ion storage battery 12 When it is determined that the lithium ion storage battery 12 is in an overdischarged state, the lithium ion storage battery 12 is generated by the electric power generated by the rotating electrical machine 10 with the first switch unit SW1 in the open state and the second switch unit SW2 in the closed state. Charged. For this reason, without performing the operation
  • connection path LD the electrical load 14 was connected to the lead storage battery 11 side of the first switch unit SW1. For this reason, even when the first switch unit SW1 is in an open state during charging of the lithium ion storage battery 12 determined to be in an overdischarged state, power is supplied from the lead storage battery 11 to the electrical load 14. it can. Therefore, the charging process of the lithium ion storage battery 12 can be performed while avoiding that the voltage supplied to the electric load 14 becomes less than the minimum voltage at which the operation of the electric load 14 can be guaranteed.
  • the power generation control unit 10b is connected to the lead storage battery 11 side of the first switch unit SW1 in the connection path LD. Thereby, it can avoid that the voltage supplied to the electric power generation control part 10b becomes less than the minimum voltage which can guarantee the operation
  • the method for determining whether or not the lithium ion storage battery 12 is in an overdischarged state is not limited to the method described in the above embodiment. For example, when it is determined that the charging rate of the lithium ion storage battery 12 is less than the lower limit of the appropriate range, the lithium ion storage battery 12 may be determined to be in an overdischarged state.
  • the charging rate of the lithium ion storage battery 12 may be calculated based on, for example, the integrated value of the charge / discharge current of the lithium ion storage battery 12 detected by the second current detection unit 33.
  • a method for determining whether or not the lithium ion storage battery 12 is in an overdischarged state for example, a determination method based on the difference between the terminal voltage VPb of the lead storage battery 11 and the terminal voltage VLi of the lithium ion storage battery 12 may be used. Specifically, when it is determined that the value obtained by subtracting the terminal voltage VLi of the lithium ion storage battery 12 from the terminal voltage VPb of the lead storage battery 11 is less than a predetermined value (> 0), the lithium ion storage battery 12 is in an overdischarged state. Can be determined.
  • a method for determining whether or not the lithium ion storage battery 12 is in an overdischarged state is not limited to using a detected value such as a terminal voltage.
  • a method may be used in which it is determined that the lithium ion storage battery 12 is in an overdischarged state when it is determined that the elapsed time since the power supply system was last used has become a predetermined time or more.
  • step S28 of FIG. 2 as a determination method of whether the charge amount of the lead storage battery 11 is enough, it is not restricted to what was demonstrated by the said embodiment. For example, when it is determined that the charge rate (SOC) of the lead storage battery 11 is less than the lower limit value of the appropriate range, it may be determined that the charge amount of the lead storage battery 11 is not sufficient.
  • the charge rate of the lead storage battery 11 should just be calculated based on the integrated value of the charging / discharging current of the lead storage battery 11 detected by the 1st electric current detection part 31, for example.
  • step S28 executed during the period when the lithium ion storage battery 12 is charged by the process of step S32 in FIG. 2, the threshold value for determining that the charge amount of the lead storage battery 11 is sufficient is the second determination.
  • the value Vth2 may be switched to another value. Specifically, for example, the second determination value Vth2 may be switched to a value that is larger than the second determination value Vth2 and smaller than the third determination value Vth3.
  • the first storage battery is the lead storage battery 11 and the second storage battery is the lithium ion storage battery 12.
  • both the first storage battery and the second storage battery are lead storage batteries or lithium ion storage batteries.
  • Both the first storage battery and the second storage battery may be the same type of storage battery.
  • storage batteries of types other than a lead storage battery and a lithium ion storage battery may be sufficient.
  • connection path LD may be configured such that an electrical load is connected to the connection point N side with respect to the first switch unit SW1.
  • an electrical load connected to the connection point N side for example, an electrical load that does not require a sufficient supply of power during charging of the lithium ion storage battery 12 in an overdischarged state, or an effect on vehicle travel And an electric load that does not need to operate during charging of the lithium ion storage battery 12 in an overdischarged state.
  • the output voltage command value Vref may be gradually increased so that the charging current of the lithium ion storage battery 12 becomes a predetermined current or less.
  • the first switch unit SW1 and the second switch unit SW2 are not limited to semiconductor switches configured by MOSFETs, and for example, semiconductor switches configured by thyristors or solid state relays may be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Control Of Charge By Means Of Generators (AREA)
  • Secondary Cells (AREA)
PCT/JP2017/016121 2016-04-28 2017-04-21 電源制御装置 WO2017188163A1 (ja)

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CN (1) CN109070819A (enrdf_load_stackoverflow)
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JP2021194963A (ja) * 2020-06-10 2021-12-27 株式会社デンソー 電源制御装置
WO2023156507A1 (en) * 2022-02-17 2023-08-24 Scania Cv Ab A power supply circuit and a method for controlling a power supply circuit

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JP7326905B2 (ja) * 2019-06-17 2023-08-16 株式会社デンソー 制御装置
KR102538244B1 (ko) * 2020-12-22 2023-05-30 경북대학교 산학협력단 다이오드를 이용한 배터리 이상 방지 장치 및 방법

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JP2004289889A (ja) * 2003-03-19 2004-10-14 Matsushita Electric Ind Co Ltd 充電装置および電子機器
JP2005080318A (ja) * 2003-08-29 2005-03-24 Fuji Electric Holdings Co Ltd 電池の充放電制御方法および充電制御装置
JP2009044318A (ja) * 2007-08-07 2009-02-26 Auto Network Gijutsu Kenkyusho:Kk 車載通信システム及び分配装置
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JP2004025979A (ja) * 2002-06-25 2004-01-29 Shin Kobe Electric Mach Co Ltd 走行車両用電源システム
JP2004289889A (ja) * 2003-03-19 2004-10-14 Matsushita Electric Ind Co Ltd 充電装置および電子機器
JP2005080318A (ja) * 2003-08-29 2005-03-24 Fuji Electric Holdings Co Ltd 電池の充放電制御方法および充電制御装置
JP2009044318A (ja) * 2007-08-07 2009-02-26 Auto Network Gijutsu Kenkyusho:Kk 車載通信システム及び分配装置
JP2015204699A (ja) * 2014-04-15 2015-11-16 株式会社デンソー 電池ユニット

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021194963A (ja) * 2020-06-10 2021-12-27 株式会社デンソー 電源制御装置
JP7342801B2 (ja) 2020-06-10 2023-09-12 株式会社デンソー 電源制御装置
WO2023156507A1 (en) * 2022-02-17 2023-08-24 Scania Cv Ab A power supply circuit and a method for controlling a power supply circuit

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JP2017197117A (ja) 2017-11-02

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