JP2014143817A - Vehicular power system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular power system that appropriately charges power storage devices and drives an accessory load.SOLUTION: The vehicular power system includes: a first battery 50; a second battery 60 having a higher capacity and a higher internal resistance than the first battery 50; a charging device 450 powered from outside a vehicle to charge the secondary battery 60; an accessory drive device 800 using power in the first battery 50; a converter 10 configured to supply part of the power with which the charging device 450 charges the second battery 60 to the first battery 50; and a control device 100 for controlling the charging device 450 and the converter 10 such that the state of charge of the first battery 50 is maintained at a desired value when the accessory drive device 800 is operated while the charging device 450 charges the second battery 60.

Description

  The present invention relates to a vehicle power supply system, and more particularly to a vehicle power supply system that includes a plurality of power storage devices and is configured to receive power from outside the vehicle and charge the power storage device.

  Japanese Patent Laying-Open No. 2011-199934 (Patent Document 1) discloses a first secondary battery that can be charged using an external power supply, and a second secondary battery connected in parallel with the first secondary battery. A step-up converter connected between the first secondary battery and the second secondary battery and changing the power supplied from the second secondary battery to the motor generator according to the required power of the motor generator. A power supply is disclosed.

JP 2011-199934 A JP 2012-019678 A

  As disclosed in Japanese Patent Application Laid-Open No. 2011-199934 (Patent Document 1), a power supply device configured to be able to be charged using an external power source and mounted with a plurality of batteries is charged after charging the first battery (high output type). If the output from the first battery to the auxiliary load is generated while charging the second battery (high capacity type), the first battery must be charged again after charging the second battery. Further, if the output power to the auxiliary load is large, there is a possibility that the auxiliary load cannot be driven appropriately due to the output limitation of the battery.

  An object of the present invention is to provide a vehicle power supply system capable of appropriately charging a power storage device and driving an auxiliary load.

  In summary, the present invention is a power supply system for a vehicle, which includes a first power storage device, a second power storage device having a larger capacity and a higher internal resistance than the first power storage device, and a second power receiving system from outside the vehicle. A charging device that charges the power storage device, an auxiliary load circuit that uses the power of the first power storage device, and a part of the power that the charging device charges to the second power storage device can be supplied to the first power storage device When the auxiliary load circuit is operated in the case where the second power storage device is charged by the voltage conversion circuit and the charging device, the charging is performed so that the charging state of the first power storage device is maintained at the target value. And a control device for controlling the voltage conversion circuit.

  Preferably, the control device controls the voltage conversion circuit when the charging state of the first power storage device becomes smaller than a predetermined value when the auxiliary load circuit is driven while the charging device is supplied with power from outside the vehicle. Then, the first power storage device is charged within the range of the output power of the charging device.

  Preferably, the control device drives the auxiliary load circuit while receiving power from the outside of the vehicle, and when the charging state of the second power storage device is greater than a predetermined threshold value, When the voltage conversion circuit is controlled so that the second power storage device is charged while supplying a part of the output power to the first power storage device, the charging is performed when the charge state of the second power storage device is smaller than a predetermined threshold value. The voltage conversion circuit is controlled so that the second power storage device is not charged while supplying the output power of the device to the first power storage device.

  Preferably, in the case where the total charge / discharge balance of the first power storage device and the second power storage device is on the charging side, the control device is configured so that when the charge state of the first power storage device is greater than the first threshold value, The voltage conversion circuit is controlled so that the second power storage device is charged while supplying a part of the output power to the first power storage device. When the charge state of the first power storage device is smaller than the first threshold value, charging is performed. The voltage conversion circuit is controlled so that the second power storage device is not charged while supplying the output power of the device to the first power storage device. In addition, when the total charge / discharge balance of the first power storage device and the second power storage device is on the discharge side, the control device has a charge state of the first power storage device that is lower than a second threshold value that is smaller than the first threshold value. Is large, the voltage conversion circuit is controlled so that the second power storage device is not charged while the output power of the charging device is supplied to the first power storage device, and the charge state of the first power storage device is the second threshold value. When smaller, the voltage conversion circuit is controlled so that the second power storage device is charged while supplying a part of the output power of the charging device to the first power storage device.

  According to the present invention, it is possible to appropriately charge the power storage device and drive the auxiliary load while the power storage device of the vehicle is being charged.

It is a figure which shows the whole vehicle block diagram. It is a figure which shows the connection relationship between each structure and the circumference | surroundings of the charging device 450 and the auxiliary machine drive device 800. 4 is a flowchart for illustrating control related to charging device 450 executed by control device 100. 3 is a flowchart for illustrating control related to converter 10 executed by control device 100. FIG. 5 is an operation waveform diagram for explaining an example in which the control of FIGS. 3 and 4 is executed. FIG. 10 is a state transition diagram for describing control executed in the second embodiment. It is a figure for demonstrating each state B1, B2, B2L of Embodiment 2. FIG. FIG. 10 is a state transition diagram for describing control executed in the third embodiment. It is a flowchart for demonstrating the state transition conditions between state ST206 and state ST208 in the case of remote air conditioning presence of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding parts are denoted by the same reference numerals, and detailed description thereof will not be repeated.

[Embodiment 1]
FIG. 1 is a diagram showing an overall block diagram of a vehicle. The vehicle in the present embodiment will be described as an example of a hybrid vehicle using an engine and a motor generator as drive sources, but is not limited to a hybrid vehicle using an engine and a motor generator as drive sources. For example, an electric vehicle using only a motor generator as a drive source may be used.

  Referring to FIG. 1, a hybrid vehicle (hereinafter simply referred to as a vehicle) 1 includes an engine 2, a first motor generator (hereinafter referred to as a first MG) 3, a power split mechanism 4, and A second motor generator (hereinafter referred to as a second MG) 5, a wheel 6, an inverter 8, a converter 10 (may be described as a boost converter in the figure), a first battery 50, a first A system main relay (hereinafter referred to as a first SMR) 52, an accessory driving device 800, a second battery 60, a second system main relay (hereinafter referred to as a second SMR) 62, and a charging relay (hereinafter referred to as CHR). 72), the control device 100, current sensors 302, 452, 502, 602, voltage sensors 304, 306, 454, 504, 604, and a charging device. Including 450, and capacitors C1, C2, the diode D3, the positive electrode line PL1, PL2, PL3, PL4, a negative electrode line NL1, NL2, NL3.

  The power supply device of the vehicle 1 includes a converter 10, a first battery 50, a second battery 60, a control device 100, and a charging device 450.

  Vehicle 1 travels using engine 2 and second MG 5 as a power source. Power split device 4 is coupled to engine 2, first MG 3 and second MG 5, and distributes power among them. The power split mechanism 4 includes a planetary gear mechanism having three rotating shafts, for example, a sun gear, a carrier, and a ring gear. These three rotating shafts are connected to the rotating shafts of engine 2, first MG3 and second MG5, respectively.

  The engine 2, the first MG 3 and the second MG 5 can be mechanically connected to the power split mechanism 4 by making the rotor of the first MG 3 hollow and passing the crankshaft of the engine 2 through the center thereof. The rotation shaft of second MG 5 is coupled to wheel 6 by a reduction gear or a differential gear (not shown). The first MG 3 operates as a generator driven by the engine 2 and operates as an electric motor that can start the engine 2. The second MG 5 mainly operates as an electric motor that drives the wheels 6.

  The engine 2 can run the vehicle 1 together with the second MG 5 or independently by burning fuel such as gasoline.

  Each of first battery 50 and second battery 60 is a chargeable / dischargeable power storage device, and includes, for example, a secondary battery such as a nickel metal hydride battery or a lithium ion battery. A large-capacity capacitor may be used in place of any or all of the first battery 50 and the second battery 60.

  First battery 50 supplies power to converter 10 when vehicle 1 is driven. Further, during power regeneration, power is supplied from converter 10 to first battery 50 and first battery 50 is charged. First battery 50 and converter 10 are connected by positive electrode line PL1 and negative electrode line NL1. One end of positive electrode line PL1 is connected to the positive electrode terminal of first battery 50, and one end of negative electrode line NL1 is connected to the negative electrode terminal of first battery 50. The other end of positive electrode line PL1 is connected to converter 10. The other end of negative electrode line NL1 is connected to inverter 8 via converter 10. A first SMR 52 is provided at a predetermined position on the positive electrode line PL1 and the negative electrode line NL1 between the first battery 50 and the converter 10.

  In response to a signal received from control device 100, first SMR 52 is connected between first battery 50 and converter 10 from one of a conductive state (on state) and a non-conductive state (off state) to the other. Switch to the state.

  When first SMR 52 is turned on, power can be exchanged between first battery 50 and converter 10 via positive line PL1 and negative line NL1.

  On the other hand, when the first SMR 52 is turned off, the first battery 50 is disconnected from the converter 10, so that power cannot be exchanged between the first battery 50 and the converter 10.

The first SMR 52 includes a first SMRB 54, a first SMRP 56, a first SMRG 58, and a limiting resistor RA. First SMRB 54 is provided in positive electrode line PL1, and switches positive electrode line PL1 from at least one of a conductive state and a non-conductive state to the other state. The first SMRG 58 is provided in the negative electrode line NL1, and switches the negative electrode line NL1 from at least one of a conductive state and a non-conductive state to the other state. The first SMRP 56 is connected in series with the limiting resistor RA. The first SMRP 56 and the limiting resistor RA are connected in parallel to the first SMRG 58 with respect to the negative electrode line NL1.

  In the case where the first SMR 52 is switched from the off state to the on state, first, in order to prevent a large current from flowing immediately after the first SMR 52 is turned on and welding occurs in the components of the first SMR 52, first, Each of the 1SMRB 54 and the first SMRP 56 is switched from the off state to the on state. When each of first SMRB 54 and first SMRP 56 is turned on, an output current from first battery 50 to converter 10 is generated. At this time, an excessive output current is suppressed by the limiting resistor RA connected in series to the first SMRP 56. For this reason, the voltage VL gradually increases. When voltage VL increases and becomes substantially equal to the voltage of first battery 50, first SMRP is switched to be turned off and first SMRG 58 is switched to be turned on.

  When first SMR 52 is switched from the on state to the off state, each of first SMRB 54 and first SMRG 58 is switched from the on state to the off state.

  Second battery 60 is connected in parallel to converter 10 with respect to the electric load (inverter 8, first MG3 and second MG5). Electrical load and converter 10 are connected by positive line PL2 and negative line NL1. One end of positive line PL3 is connected to the positive terminal of second battery 60. One end of the negative electrode line NL2 is connected to the negative electrode terminal of the second battery 60. The other end of positive electrode line PL3 is connected to first connection node NA located on positive electrode line PL2. The other end of the negative electrode line NL2 is connected to a second connection node NB located on the negative electrode line NL1. A second SMR 62 is provided at a predetermined position on the positive electrode line PL3 and the negative electrode line NL2.

  The second SMR 62 is connected between the second battery 60 and the first connection node NA and the second connection node NB according to a signal received from the control device 100, in a conductive state (on state) and a non-conductive state (off state). The state is switched from one state to the other state.

  When the second SMR 62 is turned on, power can be exchanged between the second battery 60 and the first connection node NA and the second connection node NB via the positive line PL3 and the negative line NL2.

  On the other hand, when the second SMR 62 is turned off, the second battery 60 is disconnected from the first connection node NA and the second connection node NB, and between the second battery 60 and the first connection node NA and the second connection node NB. It becomes impossible to exchange power.

  The second SMR 62 includes a second SMRB 64 and a second SMRG 66. First SMRB 64 is provided in positive electrode line PL3, and switches positive electrode line PL3 from at least one of a conductive state and a non-conductive state to the other state. The second SMRG 66 is provided in the negative electrode line NL2, and switches the negative electrode line NL2 from at least one of a conductive state and a non-conductive state to the other state.

  When the second SMR 62 is switched from the off state to the on state, both the second SMRB 64 and the second SMRG 66 are switched to the on state. Further, when the second SMR 62 is switched from the on state to the off state, the second SMRB 64 and the second SMRG 66 are switched so as to be both in the off state.

  The diode D3 is provided between the first connection node NA and the second SMRB 64. The anode of the diode D3 is connected to the second SMRB 64. The cathode of the diode D3 is connected to the first connection node NA. Diode D3 suppresses power supply to second battery 60 from converter 10 or the electrical load (inverter 8 and second MG5) side.

  The first battery 50 and the second battery 60 have their dischargeable capacities set so that, for example, simultaneous use allows the maximum power allowed for the electric load (inverter 8 and second MG 5) to be output. . As a result, traveling at maximum power is possible in EV (Electric Vehicle) traveling without using the engine 2.

  When the power stored in the second battery 60 is consumed, the power of the engine 2 is used in addition to the power of the first battery 50, so that the maximum power can be traveled without using the second battery 60. be able to.

  In the present embodiment, the first battery 50 is preferably a high-power battery having a higher output density than the second battery 60. On the other hand, the second battery 60 is preferably a high-capacity battery having a capacity density higher than that of the first battery 50. In the present embodiment, the voltage of second battery 60 is preferably a power storage device having a voltage higher than the voltage of first battery 50.

  Converter 10 boosts the voltage level of the electric power supplied from first battery 50 to a target level based on a command signal received from MG-ECU 300, and outputs the voltage boosted to the target level to positive line PL2. Converter 10 also supplies regenerative power supplied from inverter 8 via positive line PL2, or voltage level of charging power supplied from second battery 60 or charging device 450 via positive lines PL3 and PL2. Is reduced to the voltage level of the first battery 50 based on the command signal received from the MG-ECU 300 to charge the first battery 50. Further, converter 10 stops the switching operation when receiving a command signal indicating the operation stop from MG-ECU 300. Furthermore, when converter 10 receives a command signal for turning on the upper arm (Q1) from MG-ECU 300, converter 10 includes upper arm (Q1) and lower arm (Q2) in the on state and the off state, respectively. Fix it.

  Converter 10 includes power semiconductor switching elements (hereinafter simply referred to as switching elements) Q1, Q2, diodes D1, D2, and reactor L1.

  In this embodiment, IGBTs (Insulated Gate Bipolar Transistors) are applied as the switching elements Q1 and Q2, but any switching element can be applied as long as on / off control is possible by a command signal. is there. For example, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or a bipolar transistor can be applied.

  Switching elements Q1, Q2 are connected in series between positive electrode line PL2 and negative electrode line NL1. Diodes D1 and D2 are connected in antiparallel to switching elements Q1 and Q2, respectively. Reactor L1 has one end connected to a connection node of switching elements Q1 and Q2, and the other end connected to positive line PL1. Switching element Q1 corresponds to the upper arm of converter 10, and switching element Q2 corresponds to the lower arm of converter 10.

  Converter 10 includes a chopper circuit. Based on the command signal received from MG-ECU 300, converter 10 boosts the voltage of positive line PL1 using reactor L1, and outputs the boosted voltage to positive line PL2.

  At this time, MG-ECU 300 controls the step-up ratio of the output voltage from first battery 50 by controlling the on / off period ratio (duty) of switching element Q1 and / or switching element Q2.

  On the other hand, converter 10 steps down the voltage of positive line PL2 based on a command signal received from MG-ECU 300, and outputs the reduced voltage to positive line PL1.

  At this time, MG-ECU 300 controls the voltage step-down ratio of positive line PL2 by controlling the on / off period ratio (duty) of switching element Q1 and / or switching element Q2.

  Capacitor C1 is connected between positive electrode line PL2 and negative electrode line NL1, and smoothes voltage fluctuations between positive electrode line PL2 and negative electrode line NL1. Capacitor C2 is connected between positive electrode line PL1 and negative electrode line NL1, and smoothes voltage fluctuations between positive electrode line PL1 and negative electrode line NL1.

  Inverter 8 converts the DC voltage from positive line PL2 into a three-phase AC voltage based on a command signal received from MG-ECU 300 when driving first MG3, and outputs the converted AC voltage to first MG3.

  Further, the inverter 8 converts the three-phase AC voltage generated by the first MG 3 using the power of the engine 2 into a DC voltage based on a command signal received from the MG-ECU 300 during the power generation of the first MG 3, and the conversion The DC voltage thus output is output to the positive electrode line PL2.

  Inverter 8 further converts a DC voltage from positive line PL2 into a three-phase AC voltage based on a command signal received from MG-ECU 300 during EV traveling, and outputs the converted AC voltage to second MG5.

  In addition, the inverter 8 converts the three-phase AC voltage generated by the second MG 5 into a DC voltage by the rotational force input from the wheel 6 based on the command signal received from the MG-ECU 300 during regenerative braking of the vehicle 1, The converted DC voltage is output to positive line PL2.

  Each of the first MG3 and the second MG5 is a three-phase AC rotating electric machine, for example, a three-phase AC synchronous motor generator. First MG 3 outputs a three-phase AC voltage generated using the power of engine 2 to inverter 8. The first MG 3 is driven by the inverter 8 when the engine 2 is started, and cranks the engine 2.

  Second MG 5 is driven by inverter 8 to generate a driving force for driving vehicle 1. Second MG 5 also outputs to inverter 8 a three-phase AC voltage generated using the rotational force received from wheels 6 during regenerative braking of vehicle 1.

  Current sensor 302 detects current IL flowing through reactor L <b> 1 of converter 10 and outputs the detected current to MG-ECU 300. Voltage sensor 304 detects voltage VL between terminals of capacitor C2 and outputs the detected voltage to MG-ECU 300. Voltage sensor 306 detects voltage VH across the terminals of capacitor C1 and outputs it to MG-ECU 300.

  Current sensor 452 detects current Ichg flowing through positive electrode line PL4 and outputs it to charging device 450. Voltage sensor 454 detects voltage Vchg between positive electrode line PL4 and negative electrode line NL3 and outputs it to charging device 450. Voltage sensor 458 detects AC voltage VAC input to charging device 450 and outputs it to charging device 450. Charging device 450 outputs the received detection result to control device 100. Note that the current sensor 452 and the voltage sensors 454 and 458 may directly output the detection result to the control device 100 instead of the charging device 450.

  Current sensor 502 detects current IB1 flowing through positive electrode line PL1 and outputs it to B1 monitoring unit 500. The voltage sensor 504 detects the voltage VB1 of the first battery 50 and outputs it to the B1 monitoring unit 500.

  Current sensor 602 detects current IB2 flowing through positive line PL3 and outputs it to B2 monitoring unit 600. The voltage sensor 604 detects the voltage VB2 of the second battery 60 and outputs it to the B2 monitoring unit 600.

  An auxiliary machine drive device 800 is connected to positive electrode line PL1 and negative electrode line NL1. Auxiliary drive device 800 includes an air conditioner, a DC / DC converter, an auxiliary battery, and an auxiliary load which will be described later with reference to FIG. The DC / DC converter steps down the DC voltage of positive line PL1 in accordance with a signal received from control device 100, and charges the auxiliary battery. The auxiliary battery supplies power to an auxiliary load mounted on the vehicle 1. The auxiliary load is, for example, a headlight, a watch, an audio device, various ECUs, etc., but the type is not limited. The auxiliary battery is a chargeable / dischargeable power storage device, for example, a lead storage battery.

  Charging device 450 is connected to converter 10 in parallel with second battery 60. One end of positive line PL4 is connected to the positive terminal of charging device 450. One end of the negative electrode line NL3 is connected to the negative electrode terminal of the charging device 450. The other end of positive line PL4 is connected to a third connection node NC located on positive line PL3. The other end of the negative electrode line NL3 is connected to a fourth connection node ND located on the negative electrode line NL2.

  In response to a command signal received from control device 100, charging device 450 uses first electric power 50 and second electric power supplied from an external power source (described as an external power source in the following description) 710 of vehicle 1. At least one of the batteries 60 is charged or the charging is stopped.

  An inlet 456 is connected to the charging device 450. Inlet 456 is provided in vehicle 1 and has a shape connectable to a connector 702 provided at one end of charging cable 700. A plug 706 is provided at the other end of the charging cable 700. Plug 706 is connected to an outlet 708 provided in external power supply 710.

  The external power source 710 is, for example, an AC power source. The AC power source is, for example, a commercial power source supplied from a power company to a house.

  When the inlet 456 and the external power source 710 are connected by the charging cable 700, the AC power of the external power source 710 can be supplied to the charging device 450. AC power supplied from external power supply 710 is converted into DC power by charging device 450 and output to positive line PL4 and negative line NL3.

  The connector 702 is provided with a switch. When the connector 702 is connected to the inlet 456, the switch is closed. At this time, a signal indicating that the switch is in a closed state is transmitted from the switch to the control device 100. The control device 100 determines that the connector 702 is connected to the inlet 456 by receiving a signal indicating that the switch is closed. The switch opens and closes in conjunction with a restricting member that restricts the position of the connector 702 while being connected to the inlet 456.

  The plug 706 has a shape that can be connected to an outlet 708 provided in the house. AC power from an external power source 710 is supplied to the outlet 708.

  Charging cable 700 further includes a CCID (Charging Circuit Interrupt Device) 704 in addition to connector 702 and plug 706.

  The CCID 704 has a relay and a control pilot circuit. When the relay is open, the path for supplying power from the external power source 710 to the inlet 456 is blocked. When the relay is closed, power can be supplied from the external power source 710 to the inlet 456. The state of the relay is controlled by the control device 100 with the connector 702 connected to the inlet 456.

  The control pilot circuit sends a pilot signal (square wave signal) CPLT to the control pilot line in a state where the plug 706 is connected to the outlet 708 and the connector 702 is connected to the inlet 456. The pilot signal CPLT is periodically changed by a transmitter provided in the control pilot circuit.

  When plug 706 is connected to outlet 708 and connector 702 is connected to inlet 456, the control pilot circuit generates pilot signal CPLT having a predetermined pulse width (duty cycle). The pulse width of pilot signal CPLT is determined for each type of charging cable.

  The generated pilot signal CPLT is transmitted to the HV-ECU 200. Pilot signal CPLT may be transmitted to HV-ECU 200 from CCID 704 via connector 702, charging device 450 and charging device microcomputer, for example. The HV-ECU 200 determines the current capacity that can be supplied from the charging cable 700 to the vehicle 1 based on the pulse width of the received pilot signal CPLT.

  CHR72 is provided in positive electrode line PL4 and negative electrode line NL3. The CHR 72 connects at least one of a conduction state (on state) and a cutoff state (off state) between the charging device 450 and the third connection node NC and the fourth connection node ND according to a signal received from the control device 100. Switch from one state to the other.

  When the CHR 72 is turned on in a state where the inlet 456 and the external power source 710 are connected by the charging cable 700, the power supplied from the external power source 710 passes through the inlet 456 and the charging device 450, and the negative electrode line PL4. It becomes possible to output during NL3. When CHR 72 is turned off, power is cut off between the positive terminal and the negative terminal of charging device 450 and third connection node NC and fourth connection node ND, respectively.

  The CHR 72 has the same configuration as the first SMR 52. That is, the configuration in which the first battery 50 in the configuration of the first SMR 52 described above is replaced with the charging device 450, and the configuration in which the first SMRB 54, the first SMRP 56, the first SMRG 58, and the limiting resistor RA are replaced with CHRB 74, CHRP 76, CHRG 78, and the limiting resistor RC, respectively. Corresponds to the configuration.

  When CHR 72 is switched from the off state to the on state, each of CHRB 74 and CHRP 76 is switched from the off state to the on state. Thereafter, the CHRP 76 is switched from the on state to the off state, and the CHRG 78 is switched from the off state to the on state.

  Control device 100 generates a command signal for controlling inverter 8, converter 10, first SMR 52, second SMR 62, CHR 72, and charging device 450, and outputs the generated command signal to the device to be controlled. Control device 100 includes HV-ECU 200, MG-ECU 300, charging device microcomputer 400, B1 monitoring unit 500, and B2 monitoring unit 600.

  The B1 monitoring unit 500 receives the detected value of the current IB1 from the current sensor 502 and the detected value of the voltage VB1 from the voltage sensor 504. The B1 monitoring unit 500 transmits these detection values to the HV-ECU 200. Further, for example, the B1 monitoring unit 500 calculates an SOC (State Of Charge) indicating the remaining capacity (also referred to as a charged state) of the first battery 50 from these detected values, and transmits the calculated SOC to the HV-ECU 200. May be. For example, the SOC is defined as 100% when the power storage device is fully charged, and is defined as 0% when the power storage device is completely discharged. Note that the remaining capacity can be calculated by various known methods using the voltage of the power storage device, the charge / discharge current, the temperature of the power storage device, and the like, and thus will not be described in detail here. In the following description, the SOC of the first battery 50 is described as SOC1, and the SOC of the second battery 60 is described as SOC2.

  The B1 monitoring unit 500 includes, for example, the SOC1, the current IB1, the voltage VB1, the battery temperature of the first battery 50, the outside air temperature, or the like, and the charging power limit value Win1 (hereinafter also simply referred to as Win1) and the first battery 50. Limit value Wout1 (hereinafter also simply referred to as Wout1) of discharge power of one battery 50 may be calculated, and the calculated Win1 and Wout1 may be transmitted to HV-ECU 200. Note that SOC1, Win1, and Wout1 may be calculated by HV-ECU 200, for example.

  The B2 monitoring unit 600 receives the detected value of the current IB2 from the current sensor 602 and the detected value of the voltage VB2 from the voltage sensor 604. The B2 monitoring unit 600 transmits these detection values to the HV-ECU 200. Further, for example, the B2 monitoring unit 600 may calculate the SOC2 from these detection values, and transmit the calculated SOC2 to the HV-ECU 200.

  The B2 monitoring unit 600 includes, for example, a limit value Win2 (hereinafter simply referred to as Win2) of the charging power of the second battery 60 based on the SOC2, the current IB2, the voltage VB2, the battery temperature or the outside air temperature of the second battery 60, and the like. 2 A limit value Wout2 (hereinafter simply referred to as Wout2) of the discharge power of the battery 60 may be calculated, and the calculated Win2 and Wout2 may be transmitted to the HV-ECU 200. Note that SOC2, Win2, and Wout2 may be calculated by HV-ECU 200, for example.

  The HV-ECU 200 determines the control request amount CHPW of the charging device 450 (that is, the charging power from the charging device 450 based on the information of the first battery 50 and the second battery 60 received from the B1 monitoring unit 500 and the B2 monitoring unit 600. Required amount) and the control required amount CHPWCNV of the converter 10 (that is, the required amount of power supplied from the converter 10 to the first battery 50). The HV-ECU 200 transmits the calculated control request amount CHPW of the charging device 450 to the charging device microcomputer 400. HV-ECU 200 transmits calculated control request amount CHPWCCNV of converter 10 to MG-ECU 300.

  MG-ECU 300 generates a command signal for controlling converter 10 based on control request amount CHPWCNV of converter 10 received from HV-ECU 200, and transmits the command signal to converter 10.

  Charging device microcomputer 400 generates a command signal for controlling charging device 450 based on control request amount CHPW received from HV-ECU 200, and transmits the generated command signal to charging device 450.

  In the present embodiment, control device 100 switches CHR 72 from the OFF state to the ON state when vehicle 1 and external power supply 710 are connected by charging cable 700, and uses charging device 450 to control the first battery. 50 or the second battery 60 is charged.

  FIG. 2 is a diagram showing a connection relationship between each configuration of charging apparatus 450 and auxiliary device driving device 800 and the surroundings. Referring to FIG. 2, charging device 450 includes PFC (Power Factor Correction: power factor correction circuit) booster circuit 812, smoothing capacitor 818, charging DC / DC converter 814, and auxiliary DC / DC converter 816. Including. Auxiliary drive device 800 includes an auxiliary battery 802, an auxiliary load 804, a DC / DC converter 806, and an air conditioner 808.

  The PFC booster circuit 812 is connected to the inlet 456, converts the AC voltage VAC supplied from the inlet 456 into a DC voltage, and outputs the DC voltage to the smoothing capacitor 818. Although not shown, charging DC / DC converter 814 includes an insulating transformer, and a DC-AC converter circuit and an AC-DC converter circuit before and after the insulating transformer. The charging DC / DC converter 814 converts the voltage of the smoothing capacitor 818 into the charging voltage of the second battery 60 and outputs the converted voltage to the second battery 60.

  The auxiliary machine DC / DC converter 816 supplies a part or all of the electric power supplied from the external power supply 710 to the auxiliary machine driving device 800. More specifically, the auxiliary DC / DC converter 816 supplies part or all of the power supplied from the external power source 710 as charging power for the auxiliary battery 802 or power consumption for the auxiliary load 804. Used.

  The auxiliary load 804 is supplied with electric power from the first battery 50 via the DC / DC converter 806 when a travel-related system is activated such as when the vehicle is traveling. The air conditioner 808 receives power supply from the first battery 50 when a travel-related system is activated such as when the vehicle is traveling.

  In a state where power can be supplied from external power source 710 such as during charging, auxiliary load 804 is supplied with power from auxiliary battery 802 and, if necessary, is supplied with power from auxiliary DC / DC converter 816. At this time, the auxiliary battery 802 is also charged. The air conditioner 808 can receive power from the first battery 50 in a state where power can be supplied from the external power source 710 such as during charging. The first battery 50 is supplied with power from the charging device 450 via the converter 10 of FIG. 1 as necessary. In this way, when power is consumed by the air conditioner 808 or the auxiliary machine load 804 during external charging, the charge state of the auxiliary battery 802 or the first battery 50 is prevented from being lowered.

  FIG. 3 is a flowchart for illustrating control related to charging device 450 executed by control device 100. Control related to charging device 450 is mainly executed by HV-ECU 200 and charging device microcomputer 400. The charging device microcomputer 400 may be disposed near the charging device 450 and housed in the same housing.

  Referring to FIGS. 1 and 3, when the processing of this flowchart is started, it is determined in step S100 whether connector 702 is connected to inlet 456 or not. If the connection between the connector 702 and the inlet 456 is detected in step S100, the process proceeds to step S101. If the connection between the connector 702 and the inlet 456 is not detected, the process proceeds to step S102. Processing proceeds.

  In step S102, after the CHR 72 is turned off, the process proceeds to step S108 and the control is returned to the main routine. On the other hand, in step S101, after the CHR 72 is turned on, the process proceeds to step S103.

  In step S103, it is determined whether or not voltage VB2 of second battery 60 is equal to or higher than threshold value CP1 (B2). The measured value of the voltage VB2 is detected by the voltage sensor 604 and transmitted to the HV-ECU 200 via the B2 monitoring unit 600.

  If VB2 ≧ CP1 (B2) is satisfied in step S103, the process proceeds to step S105. If VB2 ≧ CP1 (B2) is not satisfied, the process proceeds to step S104.

  In step S104, B2 charging process 1 (rapid charging) is executed by HV-ECU 200 and charging device microcomputer 400. Specifically, HV-ECU 200 issues a charging command including control request amount CHPW corresponding to rapid charging to charging device microcomputer 400. After step S104, the process proceeds to step S108.

  In step S105, it is determined whether or not voltage VB2 of second battery 60 is equal to or higher than threshold value CP2 (B2). The threshold value CP2 (B2) is set higher than the threshold value CP1 (B2). The measured value of the voltage VB2 is detected by the voltage sensor 604 and transmitted to the HV-ECU 200 via the B2 monitoring unit 600.

  If VB2 ≧ CP2 (B2) is satisfied in step S105, the process proceeds to step S107. If VB2 ≧ CP2 (B2) is not satisfied, the process proceeds to step S106.

  In step S106, B2 charging process 2 (push-in charging) is executed by HV-ECU 200 and charging device microcomputer 400. Specifically, HV-ECU 200 issues a charging command including control request amount CHPW corresponding to push-in charging to charging device microcomputer 400. Note that the control request amount CHPW corresponding to the push-in charge is set to a value smaller than the control request amount CHPW corresponding to the quick charge in step S104. After step S104, the process proceeds to step S108, and control is returned to the main routine.

  In step S107, after charging of the second battery 60 is stopped, the process proceeds to step S108, and the control is returned to the main routine.

  FIG. 4 is a flowchart for describing control related to converter 10 executed by control device 100. Control related to converter 10 is mainly executed by HV-ECU 200 and MG-ECU 300.

  Referring to FIGS. 1 and 4, when the processing of this flowchart is started, it is determined in step S120 whether connector 702 is connected to inlet 456 or not. If the connection between the connector 702 and the inlet 456 is detected in step S120, the process proceeds to step S121. If the connection between the connector 702 and the inlet 456 is not detected, the process proceeds to step S128. Processing proceeds. In step S128, control is returned to the main routine.

  In step S121, control device 100 determines whether or not there is an accessory drive command. The auxiliary machine drive command includes an operation command for the air conditioner 808 in FIG. If it is determined in step S121 that there is an accessory drive command, the process proceeds to step S122. If it is determined that there is no accessory drive command, the process proceeds to step S123.

  In step S123, after SMR 52 and SMR 62 are turned off, the process proceeds to step S128, and control is returned to the main routine. On the other hand, in step S122, after SMR 52 and SMR 62 are turned on, the process proceeds to step S124.

  In step S124, it is determined whether or not voltage VB1 of first battery 50 is equal to or lower than threshold value CP1L (B1). The measured value of the voltage VB1 is detected by the voltage sensor 504 and transmitted to the HV-ECU 200 via the B1 monitoring unit 500.

  If VB1 ≦ CP1L (B1) is satisfied in step S124, the process proceeds to step S126 after executing the process of step S125. If VB1 ≦ CP1L (B1) is not satisfied, the process of step S125 is executed. Instead, the process proceeds to step S126. In step S125, HV-ECU 200 issues a charge command including control request amount CHPWCNV corresponding to minute charge to MG-ECU 300.

  In step S126, it is determined whether or not voltage VB1 of first battery 50 is equal to or higher than threshold value CP1H (B1). The measured value of the voltage VB1 is detected by the voltage sensor 504 and transmitted to the HV-ECU 200 via the B1 monitoring unit 500. Threshold value CP1H (B1) is preferably set higher than threshold value CP1L (B1) in order to prevent frequent changes in the charging command.

  If VB1 ≧ CP1H (B1) is satisfied in step S126, the process proceeds to step S128 after execution of step S127. If VB1 ≧ CP1H (B1) is not satisfied, the process of step S127 is executed. Instead, the process proceeds to step S128. In step S127, HV-ECU 200 issues a charge command including control request amount CHPWCNV corresponding to stopping minute charging to MG-ECU 300. In step S128, control is returned to the main routine.

  FIG. 5 is an operation waveform diagram for explaining an example in which the control of FIGS. 3 and 4 is executed. Referring to FIGS. 1 and 5, at time t0, charging is not yet performed. At this time, when the connector 702 is connected to the inlet 456 and the charging start condition is satisfied, the second battery 60 is charged in response to the control request amount CHPW for the charging device 450 rising from 0 to FULL at time t1. Is started, and the voltage VB2 also starts to rise.

  At times t1 to t2, the first battery 50 is discharged by using an auxiliary machine (for example, an air conditioner 808 for air conditioning), and the voltage VB1 decreases. For example, a case where air conditioning is executed by remote operation before boarding during external charging (hereinafter referred to as remote air conditioning) can be considered.

  When voltage VB1 falls to threshold value CP1L (B1) at time t2, converter 10 is controlled so that booster gate of converter 10 is turned on and first battery 50 is charged for the balance target value, and time t2-t3. Then, the voltage VB1 increases. Since the first battery 50 is charged, the power balance (B2 balance) for charging the second battery is smaller than the maximum value.

  At time t2 to t3, the first battery 50 is charged via the converter 10 (as a result of issuing the control request amount CHPWCNV for the converter consumed by the auxiliary machine + charged amount of the first battery 50), and at time t3, the voltage VB1 is When the threshold value CP1H (B1) is reached, the booster gate is turned off and the power consumed by the auxiliary equipment is taken out from the first battery 50, so that the voltage VB1 starts to decrease again after time t3.

  At time t4, the charging of the second battery 60 has progressed and the voltage VB2 has reached the threshold value CP1 (B2). Therefore, in order to avoid overcharging, the control request amount CHPW (charger power command) is changed from FULL to the CP2 target value. Reduced to From time t1 to t4, the second battery 60 is rapidly charged, and from time t4 to t6, push-in charging with reduced charging power is performed.

  During this time, from time t3 to t5, the first battery 50 is discharged by using the auxiliary machine (air conditioner 808), and the voltage VB1 decreases. When voltage VB1 drops to CP1L (B1) at time t5, the boost gate of converter 10 is turned on at time t5 to t6, the first battery 50 is charged for the balance target value, and voltage VB1 rises again, and time t6 When the voltage VB2 reaches the threshold value CP2 (B2), the charging is completed.

  As described above, in the first embodiment, when power consumption occurs in the first battery 50 due to the operation of the auxiliary device drive device 800 or the like when the second battery 60 is charged, the total charge / discharge balance of the first battery 50 is balanced. The feedback of the electric power command with respect to the converter 10 is implemented.

  In this case, the charging device 450 and the charging device microcomputer 400 perform the same operation as the charging when the auxiliary device driving device 800 is not operating. That is, the charging device microcomputer 400 feedback-controls the actual charging power with respect to the given power command CHPW while looking at the state of the second battery 60. In addition, HV-ECU 200 uses converter 10 to bring out the power consumption of auxiliary device drive device 800 from the power supplied by charging device 450 and maintains the SOC of first battery 50.

  Thus, charging of the second battery 60 can be completed while maintaining the SOC of the first battery 50 and supplying power to the auxiliary device driving device 800.

  Preferably, the power feedback center value of converter 10 for maintaining the SOC of first battery 50 (the balance target value of B1 balance in FIG. 5) is set to the minute charge side within the output power range of charging device 450. To do. Then, when voltage VB1 reaches full charge voltage (threshold value CP1H (B1) in FIG. 5), converter 10 is stopped, and when voltage VB1 decreases to threshold value CP1L (B1) in FIG. 5, converter 10 is activated. By repeating this, the SOC of the first battery 50 can be maintained in a small range near the full charge regardless of the component tolerance of the current sensor or the like of the first battery 50.

  Further, since the shortage of the first battery 50 can be charged while the second battery 60 is being charged, resumption of charging such as charging the first battery 50 after the completion of charging of the second battery 60 can be prevented.

[Embodiment 2]
In the second embodiment, the configurations of FIGS. 1 and 2 are the same as those of the first embodiment, but it is assumed that the capacity of the second battery 60 is larger than the capacity of the first battery 50. Further, a request for air conditioning (or my room function, etc.) by remote control operation during charging is defined as a load operation submode. The My Room function is a function that allows the auxiliary device drive device 800 to be used by using a part of the supplied power during plug-in charging from an external power source. In the second embodiment, a state transition method for maximally using the energy of the second battery 60 in the load operation submode is proposed.

  FIG. 6 is a state transition diagram for explaining the control executed in the second embodiment. In FIG. 6, remote air conditioning is described as an example of a request for transition to the load operation submode. FIG. 7 is a diagram for explaining the states B1, B2, and B2L according to the second embodiment.

  Referring to FIGS. 6 and 7, state B <b> 1 is a state in which first battery 50 is mainly charged. In state B1, first SMR 52 and second SMR 62 in FIG. 1 are both controlled to be connected, and power can be sent from charging device 450 to first battery 50 and auxiliary device driving device 800 via converter 10. In addition, in the accessory driving device 800, the DC / DC converter 806 of FIG. 2 is activated, and the accessory load 804 can be driven.

  In state B1, charging device 450 performs rapid charging until it reaches threshold value CP1 (B2) while observing voltage VB2 of second battery 60, but voltage VB2 of second battery 60 is the threshold. When the value CP1 (B2) is exceeded, in-charge charging (threshold value CP2 (B2)) is not performed and charging device 450 stops.

  In state B1, HV-ECU 200 performs rapid charging using converter 10 while observing voltage VB1 of first battery 50 until threshold value CP1 (B1) is reached. When voltage VB1 exceeds threshold value CP1 (B1), push-in charging is performed until threshold value CP2 (B1) is reached. However, when remote air conditioning is performed to drive air conditioner 808 during charging, push-in charging is not performed and converter 10 is stopped.

  State B2 is a state in which the second battery 60 is mainly charged. In the state B2, both the first SMR 52 and the second SMR 62 in FIG. 1 are controlled to be in the cut-off state, and the DC / DC converter 816 operates instead of the DC / DC converter 806 in FIG. In the state B2, the auxiliary load 804 can be driven by the DC / DC converter 816, but the air conditioner 808 cannot be driven.

  In state B2, charging device 450 performs rapid charging until it reaches threshold value CP1 (B2) while observing voltage VB2 of second battery 60, and voltage VB2 of second battery 60 is at the threshold value. When CP1 (B2) is exceeded, push-in charging is performed until the threshold value CP2 (B2) is reached.

  In state B2, HV-ECU 200 stops converter 10. In the state B2, the first SMR 52 in FIG. 1 is in the cut-off state, so the first battery 50 is not charged.

  The state B2L is a state in which the second battery 60 is charged and power is also supplied to the auxiliary machine driving device 800. In the state B2L, both the first SMR 52 and the second SMR 62 in FIG. 1 are controlled to be connected, and power can be sent from the charging device 450 to the first battery 50 and the auxiliary device driving device 800 via the converter 10. In addition, in the accessory driving device 800, the DC / DC converter 806 of FIG. 2 is activated, and the accessory load 804 can be driven.

  In state B2L, charging device 450 performs rapid charging until it reaches threshold value CP1 (B2) while observing voltage VB2 of second battery 60, and voltage VB2 of second battery 60 is at the threshold value. When CP1 (B2) is exceeded, push-in charging is performed until the threshold value CP2 (B2) is reached. However, when remote air conditioning for driving the air conditioner 808 at the time of charging is performed, push-in charging is not performed and the charging device 450 stops.

  Further, in the state B2L, the HV-ECU 200 performs minute charge feedback processing using the converter 10 while observing the voltage VB1 of the first battery 50. In the minute charge feedback process, when the voltage VB1 is lower than the threshold value CP1H (B1), the converter 10 is operated (boost gate ON) as shown in the B1 balance of FIG. When the battery 50 is set to a value at which minute charging is performed and voltage VB1 reaches threshold value CP1 (B1) H, the operation of converter 10 is stopped. Thereafter, when voltage VB1 drops to threshold value CP1 (B1) L, the operation of converter 10 is resumed. In this case, push-in charging using threshold value CP2 (B1) is not performed.

  The state transition shown in FIG. 6 will be described. First, when charging is started by connecting a connector to the inlet and pressing a charging start button, a state transition occurs from state ST200 to state ST202. In state ST202, control as shown in state B1 of FIG. 7 is performed. If first battery 50 is in a fully charged state, a state transition occurs from state ST200 to state ST203 without transitioning to state ST202.

  When first battery 50 is charged in state ST202 to a fully charged state (voltage VB1 reaches threshold value CP2 (B1)), a state transition occurs from state ST202 to state ST203.

  In state ST203, the control shown in state B2 of FIG. 7 is performed. When second battery 60 is charged in state ST203 to a fully charged state (voltage VB2 reaches threshold value CP2 (B2)), a state transition occurs from state ST203 to state ST208.

  As described above, in the states ST202 and ST203, when the auxiliary DC / DC converter 816 cannot be used, a state transition occurs from the state ST202 or ST203 to the state ST204. The case where the auxiliary DC / DC converter 816 is unusable means that the auxiliary DC / DC converter 816 fails or the auxiliary machine consumes power exceeding the rating of the auxiliary DC / DC converter 816. Etc. In state ST204, the control shown in state B2L of FIG. 7 is performed.

  As described above, the states ST202, ST203, ST204 are included in the state ST201 without remote air conditioning. When there is a request for remote air conditioning, a state transition occurs from state ST201 to state ST207 in state ST205 with remote air conditioning. In state ST207, the control shown in state B2L shown in FIG. 7 is performed. After receiving the load operation submode request at the time of remote air conditioning or the like, the state is temporarily shifted to the state B2L in order to use the second battery 60 preferentially. Note that in this remote air-conditioning state, the charging process is not stopped except when a power failure or abnormality occurs. For example, in the state with remote air conditioning, even if the first battery 50 and the second battery 60 are in a fully charged state, the charging control is not terminated and the charging device 450 performs control to maintain the fully charged state.

  When the power consumed by the remote air conditioning is larger than the power supplied from the charging device 450, the SOC of the second battery 60 decreases as a result of discharging, and reaches a predetermined threshold before the SOC becomes overdischarged. Then, state transition occurs from state ST207 to state ST206. In state ST206, the control shown in state B1 of FIG. 7 is performed. Even in the state ST206, if the power consumption by the remote air conditioning is larger than the power supplied from the charging device 450, the SOC of the first battery 50 also decreases. In this case, the system is forcibly terminated before reaching the lower limit of SOC that causes overdischarge.

  In ST206, when the power supplied from charging device 450 is larger than the power consumed by remote air conditioning, the SOCs of first battery 50 and second battery 60 are recovered. When the SOC of second battery 60 has recovered to a predetermined threshold value, a state transition occurs from state ST206 to state ST207.

  Note that it is preferable to provide a difference in the SOC threshold value for determining the state transition between the state ST206 and the state ST207 so as to have an appropriate hysteresis so that the state transition does not occur frequently.

  In addition, although the upper limit is set by the discharge limit (Wout1) of the 1st battery 50 in the use permission electric power in the air conditioner at the normal time (at the time of non-charging), in the state B2L under the load operation submode, the 1st battery The permitted use power may be expanded up to the sum of 50 Wout1 and the second battery 60 Wout2. Furthermore, it is possible to expand to a value obtained by adding the charging power of the charging device 450. Thereby, the opportunity which can use electric power larger than before for air conditioning increases.

  After canceling the load operation sub-mode request such as stopping remote air conditioning, a state transition occurs from state ST205 to state ST202. This is because there is no guarantee that the first battery 50 is in a fully charged state, and the state is shifted to the state ST202 in order to preferentially charge the first battery 50.

  In the second embodiment, the energy of the large-capacity second battery 60 can be utilized to the maximum in the load operation submode.

[Embodiment 3]
In the third embodiment, the configuration of FIGS. 1 and 2 is the same as that of the first embodiment, but it is assumed that the first battery 50 has a lower internal resistance than the second battery 60. Then, a state transition method for optimizing the power energy efficiency when the load operation submode is requested is proposed.

  FIG. 8 is a state transition diagram for explaining the control executed in the third embodiment. The state transition diagram shown in FIG. 8 shows that the transition destination when state transition occurs from state ST201 without remote air conditioning to state ST205 with remote air conditioning is state ST206, and between state ST206 and state ST208. The switching condition that causes the state transition is different from the state transition diagram of FIG. 6 of the second embodiment. Since the state transition of the other part (the state transition inside state ST201 with remote air conditioning) is as described in FIG. 6, description thereof will not be repeated here.

  In FIG. 8, when a load operation submode such as an operation request for remote air conditioning is requested, a state transition occurs from the state ST201 to the state ST206 that is temporarily used once. Then, state transition between state ST206 and state ST208 is controlled according to the flowchart described below.

  FIG. 9 is a flowchart for explaining a state transition condition between state ST206 and state ST208 in the case of remote air conditioning with FIG. Referring to FIGS. 1 and 9, when the process is started, first, in step S301, it is determined whether or not the total power balance of first battery 50 and second battery 60 is on the discharge side. For example, P1 = IB1 × VB1 is calculated from the measured values of the current sensor 502 and the voltage sensor 504, P2 = IB2 × VB2 is calculated from the measured values of the current sensor 602 and the voltage sensor 604, and the total power balance is calculated by the sign of P1 + P2. It can be determined whether or not the discharge side.

  If it is determined in step S301 that the total power balance is on the discharge side, the process proceeds to step S302. If it is determined that the total power balance is not on the discharge side (on the charge side), the process proceeds to step S303. Processing proceeds.

  In step S302, it is determined whether or not the SOC of the first battery 50 is equal to or less than a predetermined threshold value close to empty (Empty). In step S302, if the SOC of the first battery 50 is equal to or less than a predetermined threshold value close to empty, the process proceeds to step S305 through the path A3, and the SOC of the first battery 50 is close to empty. If it has not decreased to the predetermined threshold value, the process proceeds to step S304 through path A1.

  On the other hand, in step S303, it is determined whether or not the SOC of the first battery 50 is equal to or greater than a predetermined threshold value close to full charge (Full). In step S302, if the SOC of the first battery 50 is equal to or greater than a predetermined threshold value close to full charge, the process proceeds to step S305 through the path A4, and the SOC of the first battery 50 is fully charged. If the predetermined threshold value close to is not reached, the process proceeds to step S304 through the route A2.

  In step S304, the charging control shown in the state B1 in FIG. 7 is performed as a normal process. On the other hand, in step S305, the charging control shown in state B2L in FIG. 7 is performed.

  Next, the concept of battery protection for the paths A1 to A4 in FIG. 9 will be described. The transition of the route A1 indicates a case where the power of the first battery 50 is consumed. In this case, in order to prevent overdischarge of the first battery 50, when the power of the first battery 50 is used up, switching is performed so that the power of the second battery 60 is consumed.

  The transition of the path A2 indicates a case where the first battery 50 is charged with electric power. In this case, in order to prevent overcharging of the first battery 50, when the SOC of the first battery 50 is charged to a predetermined threshold value near full charge, the gate of the converter 10 is shut off and the operation is stopped. The control is switched so that only the second battery 60 is charged.

  The transition of the route A3 indicates a case where the power of the second battery 60 is consumed. In this case, in order to prevent overdischarge of the second battery 60, the control required amount CHPWCCNV of the converter 10 is guarded with a guard value Wout2 determined from the battery characteristics. At this time, after the power is further consumed from the first battery 50, a guard is applied with a guard value Wout1 determined from the characteristics of the first battery 50, and the A / C (air conditioner) power is reduced. Note that the boosting gate of converter 10 may be shut off for emergency avoidance.

  The transition of the route A4 indicates a case where the second battery 60 is charged with electric power. In this case, when the voltage VB2 of the second battery 60 is charged until it reaches a predetermined threshold value (CP1 (B2) in FIG. 5), the charging device 450 is stopped and the threshold value CP1 (B2) is set. The overcharge of the second battery 60 is avoided by controlling so as not to perform the push-in charge up to the threshold value CP2 (B2).

  In the third embodiment, when the load operation request submode is applied, the charge / discharge balance of the first battery 50 and the second battery 60 as a whole is determined when the amount of power used in the load can vary. When the determination result is on the charging side, the first battery 50 that has low internal resistance and can be charged with high efficiency is preferentially charged, and when the first battery 50 cannot be additionally charged, the second battery 60 is charged. When the determination result is the discharge side, the first battery 50 having low internal resistance and high efficiency can be preferentially discharged, and when the first battery 50 cannot be additionally discharged, the second battery 60 is discharged. . By performing charge / discharge control in this way, it is possible to realize a state transition in which energy efficiency is optimized as a total.

  Finally, the first to third embodiments will be summarized again with reference to the drawings. The power supply system for a vehicle described in the first to third embodiments includes a first battery 50, a second battery 60 having a larger capacity and a larger internal resistance than the first battery 50, and a second receiving electric power from the outside of the vehicle. A charging device 450 that charges the battery 60, an auxiliary device driving device 800 that uses the power of the first battery 50, and a part of the power that the charging device 450 charges to the second battery 60 is supplied to the first battery 50. When the auxiliary device drive device 800 is operated in the case where the second battery 60 is charged by the converter 10 configured to be capable of charging and the charging device 450, the charged state of the first battery 50 is maintained at the target value. Thus, the control apparatus 100 which controls the charging device 450 and the converter 10 is provided.

  Preferably, control device 100 controls converter 10 when charging state of first battery 50 becomes smaller than a predetermined value when driving auxiliary device driving device 800 while charging device 450 is supplied with power from outside the vehicle. To control the first battery 50 to be charged within the range of output power of the charging device 450. More preferably, as shown at times t2 to t3 and t5 to t6 in FIG. 5, when the state of charge of the first battery 50 falls below a value corresponding to the threshold value CP1H (B1), the first battery It is preferable to set 50 charge / discharge balance targets to be minute charge.

  Preferably, as shown in the state transition diagram of FIG. 6, when control device 100 drives auxiliary device drive device 800 while charging device 450 is supplied with power from outside the vehicle (ST205), the second battery When charge state of 60 is larger than a predetermined threshold value, converter 10 is controlled so that second battery 60 is charged while supplying a part of output power of charging device 450 to first battery 50 (state). ST207 (state B2L)) When the charging state of the second battery 60 is smaller than the predetermined threshold value, the second battery 60 is not charged while the output power of the charging device 450 is supplied to the first battery 50. The converter 10 is controlled (state ST206 (state B1)).

  Preferably, as shown in FIGS. 8 and 9, control device 100 provides first battery 50 when the total charge / discharge balance of first battery 50 and second battery 60 is on the charge side (NO in S <b> 301). Is greater than the first threshold value (YES in S303), the converter is configured to charge the second battery 60 while supplying a part of the output power of the charging device 450 to the first battery 50. 10 (step S305 (state B2L)) and the charging state of the first battery 50 is smaller than the first threshold value (threshold value for determining the vicinity of full charge) (NO in S303), the charging device The converter 10 is controlled so that the second battery 60 is not charged while supplying the output power of 450 to the first battery 50 (step S304 (state B1)). In addition, when the total charge / discharge balance of first battery 50 and second battery 60 is on the discharge side (YES in S301), control device 100 determines a second threshold value (Empty) that is smaller than the first threshold value. When the charging state of the first battery 50 is larger than the threshold value for determining the vicinity (NO in S302), the second battery 60 is charged while supplying the output power of the charging device 450 to the first battery 50. Converter 10 is controlled so as not to occur (step S304 (state B1)), and when the charging state of first battery 50 is smaller than the second threshold value (YES in S302), the output power of charging device 450 is reduced. The converter 10 is controlled so that the second battery 60 is charged while supplying a part to the first battery 50 (step S305 (state B2L)).

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1 vehicle, 2 engine, 3 first motor generator, 4 power split mechanism, 5 second motor generator, 6 wheels, 8 inverter, 10 converter, 50 1st battery, 60 2nd battery, 100 control device, 302, 452, 502, 602 Current sensor, 304, 306, 454, 458, 504, 604 Voltage sensor, 400 charging device microcomputer, 450 charging device, 456 inlet, 500 B1 monitoring unit, 600 B2 monitoring unit, 700 charging cable, 702 connector, 706 Plug, 708 outlet, 710 External power supply, 800 Auxiliary drive device, 802 Auxiliary battery, 804 Auxiliary load, 806, 814, 816 DC / DC converter, 808 Air conditioner, 812 PFC boost circuit, 818, C1, C2 Smoothing capacitor, D1-D3 diode, L1 reactor, NA first connection node, NB second connection node, NC third connection node, ND fourth connection node, NL1-NL3 negative line, PL1-PL4 positive line, Q1, Q2 Switching element, RA, RC Limiting resistor.

Claims (4)

A first power storage device;
A second power storage device having a larger capacity and a larger internal resistance than the first power storage device;
A charging device that receives power from outside the vehicle and charges the second power storage device;
An auxiliary load circuit that uses electric power of the first power storage device;
A voltage conversion circuit configured to be able to supply the first power storage device with a part of the power charged by the charging device to the second power storage device;
When charging the second power storage device by the charging device, when the auxiliary load circuit is operated, the charging device and the voltage are maintained such that the state of charge of the first power storage device is maintained at a target value. A power supply system for a vehicle, comprising: a control device that controls the conversion circuit.   When the charging state of the first power storage device is smaller than a predetermined value when the control device is driving the auxiliary load circuit while receiving power from the outside of the vehicle, the voltage conversion circuit The vehicle power supply system according to claim 1, wherein the first power storage device is charged within a range of electric power that can be output from the charging device by controlling the power.   When the charging device is driving the auxiliary load circuit while receiving power from outside the vehicle, when the charging state of the second power storage device is greater than a predetermined threshold value, the control device The voltage conversion circuit is controlled so that the second power storage device is charged while supplying a part of the output power of the device to the first power storage device, and the state of charge of the second power storage device is a predetermined threshold. 2. The vehicle according to claim 1, wherein when the value is smaller than the value, the voltage conversion circuit is controlled such that the output power of the charging device is supplied to the first power storage device and the second power storage device is not charged. Power system. When the total charge / discharge balance of the first power storage device and the second power storage device is on a charge side, the control device is configured to charge the first power storage device when the charge state of the first power storage device is greater than a first threshold value. The voltage conversion circuit is controlled so that the second power storage device is charged while supplying a part of the output power of the device to the first power storage device, and the charge state of the first power storage device is the first When the threshold value is smaller than the threshold value, the voltage conversion circuit is controlled so that the second power storage device is not charged while the output power of the charging device is supplied to the first power storage device.
When the total charge / discharge balance of the first power storage device and the second power storage device is on a discharge side, the control device is configured to reduce the first power storage device from a second threshold value that is smaller than the first threshold value. When the state of charge of the first power storage device is large, the voltage conversion circuit is controlled so that the second power storage device is not charged while the output power of the charging device is supplied to the first power storage device. When the state of charge is smaller than the second threshold value, the voltage conversion circuit is controlled so that the second power storage device is charged while supplying a part of the output power of the charging device to the first power storage device. The vehicle power supply system according to claim 1.

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