JP6488995B2 - Control device for in-vehicle power supply system - Google Patents

Description

  The present invention relates to a control device for an in-vehicle power supply system that supplies power to an electric load of a vehicle from a first storage battery and a second storage battery.

  Patent Document 1 proposes a configuration in which a lithium ion storage battery (first storage battery) with high power efficiency and an inexpensive lead storage battery (second storage battery) are connected in parallel and mounted on a vehicle. In this configuration, the lithium ion storage battery is preferentially charged with the power generated by regenerative power generation to improve power efficiency and the lead storage battery performs dark current supply, thereby reducing the cost of the power supply system. Realized

JP 2012-90404 A

  In the power supply system in which the two storage batteries described above are mounted on the vehicle, a situation is assumed in which the second storage battery becomes unusable due to disconnection of the second storage battery or the like. When the second storage battery becomes unusable, for example, when the generator mounted on the vehicle is an external excitation system and is excited using the power of the second storage battery, or the generator itself fails. In this case, regenerative power generation in the generator becomes impossible. In such a case, the first storage battery supplies power to the electric load of the vehicle before the vehicle is safely stopped.

  The present invention has been made in view of the above problems, and in a power supply system in which two storage batteries are connected in parallel and mounted on a vehicle, the safety of the vehicle when the second storage battery becomes unusable is improved. The main purpose is to

  The first configuration includes a first storage battery (10) and a second storage battery (41) connected in parallel to the first storage battery, from the first storage battery and the second storage battery, an electric load ( 45) A control device (20) for an in-vehicle power supply system that supplies power to the electric load, and in the electric load, a consumed capacity that is consumed until the vehicle is stopped during a predetermined evacuation travel of the vehicle A setting unit that sets a minimum capacity, which is a minimum value of a charging capacity of the first storage battery, and a prohibiting unit that prohibits the charging capacity of the first storage battery from being less than the minimum capacity. It is characterized by.

  The minimum capacity of the first storage battery is set based on the power consumption consumed in the electric load until the vehicle is stopped. With such a configuration, even when the second storage battery becomes unusable, the electric load can be operated continuously until the vehicle stops. For this reason, the safety | security of a vehicle can be improved.

  A 2nd structure is connected to the 1st storage battery (10), the 2nd storage battery (41) connected in parallel to the 1st storage battery, the 1st storage battery, and the 2nd storage battery, and generates the electric power, A generator (40) for charging the first storage battery and the second storage battery, and supplying electric power from the first storage battery, the second storage battery, and the generator to an electric load (45) of a vehicle A control device (20) for an in-vehicle power supply system that performs the above-described generation, wherein the generator is an external excitation type generator that generates power by being supplied with an excitation current, and is based on the amount of electric power that can externally excite the generator. And a setting unit that sets a minimum capacity, which is a minimum value of the charging capacity of the first storage battery, and a prohibiting unit that prohibits the charging capacity of the first storage battery from being less than the minimum capacity. And

  When the power supply system includes a generator of an external excitation system, the minimum capacity of the first storage battery is set based on the amount of power that allows the generator to be externally excited. With such a configuration, regenerative power generation in the generator can be performed even when the second storage battery becomes unusable. For this reason, it becomes possible to operate the electric load continuously until the vehicle stops, and the safety of the vehicle can be improved.

The electrical block diagram of a power supply system. The figure showing the SOC-open end voltage characteristic of a lithium ion storage battery. 6 is a flowchart showing minimum capacity setting processing. The figure showing the relationship between a vehicle speed and the stop time of a vehicle. The flowchart showing the discharge prohibition process of a lithium ion storage battery.

(First embodiment)
Hereinafter, embodiments will be described with reference to the drawings. A vehicle on which the in-vehicle power supply system of this embodiment is mounted travels using an engine (internal combustion engine) as a drive source, and has a so-called idling stop function.

  As shown in FIG. 1, the power supply system includes a lithium ion storage battery 10 (first storage battery), a MOS switch 15, an SMR switch 16, a rotating electrical machine 40, a lead storage battery 41 (second storage battery), a starter 44, and various electric loads. 45. Among these, the lithium ion storage battery 10 and each switch 15 and 16 are integrated by being accommodated in the housing | casing (accommodating case) which is not shown in figure, and is comprised as the battery unit U. FIG. Further, the battery unit U has a control device 20 that controls the in-vehicle power supply system, and the switches 15 and 16 and the control device 20 are accommodated in the casing in a state of being mounted on the same substrate. .

  The battery unit U is provided with a first terminal T1 and a second terminal T2 as external terminals. A lead storage battery 41, a starter 44, and an electric load 45 are connected to the first terminal T1, and a second terminal T2 is connected to the second terminal T2. A rotating electrical machine 40 is connected. The terminals T1 and T2 are both large current input / output terminals through which input / output currents of the rotating electrical machine 40 flow.

  The rotating shaft of the rotating electrical machine 40 is connected to an engine output shaft (not shown) by a belt or the like, and the rotating shaft of the rotating electrical machine 40 is rotated by the rotation of the engine output shaft. As a result, the engine output shaft rotates. In this case, the rotating electrical machine 40 includes a power generation function for generating power (regenerative power generation) by rotation of the engine output shaft and the axle, and a power output function for applying rotational force to the engine output shaft, and an ISG (Integrated Starter Generator). It is what constitutes.

  The lead storage battery 41 and the lithium ion storage battery 10 are electrically connected in parallel to the rotating electrical machine 40, and the storage batteries 10 and 41 can be charged by the generated power of the rotating electrical machine 40. The rotating electrical machine 40 is driven by power feeding from the storage batteries 10 and 41.

  The lead storage battery 41 is a known general-purpose storage battery. On the other hand, the lithium ion storage battery 10 is a high-density storage battery with less power loss in charge / discharge and higher output density and energy density than the lead storage battery 41.

  Specifically, the lead storage battery 41 is configured such that the positive electrode active material is lead dioxide (PbO2), the negative electrode active material is lead (Pb), and the electrolytic solution is sulfuric acid (H2SO4). And the some battery cell comprised from these electrodes is connected in series, and is comprised. In the present embodiment, setting is made such that the charge capacity of the lead storage battery 41 is larger than the charge capacity of the lithium ion storage battery 10.

  On the other hand, an oxide containing lithium (lithium metal composite oxide) is used for the positive electrode active material of the lithium ion storage battery 10, and specific examples include LiCoO2, LiMn2O4, LiNiO2, LiFePO4, and the like. As the negative electrode active material of the lithium ion storage battery 10, carbon (C), graphite, lithium titanate (for example, LixTiO2), an alloy containing Si or Sn, or the like is used. An organic electrolyte is used as the electrolyte of the lithium ion storage battery 10. And the some battery cell comprised from these electrodes is connected in series, and is comprised.

  In addition, the codes | symbols 12 and 43 in FIG. 1 represent the battery cell assembly of the lithium ion storage battery 10 and the lead storage battery 41, and the codes | symbols 11 and 42 represent the internal resistance of the lithium ion storage battery 10 and the lead storage battery 41.

  The electric load 45 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 request load include a navigation device and an audio device. In this case, stable operation of each of the above devices can be realized by suppressing voltage fluctuation. If the voltage input to the constant voltage request load fluctuates, the operation of the constant voltage request load stops and then restarts.

  In addition, examples of the electric load 45 include wipers such as a headlight and a front windshield, a blower fan for an air conditioner, and a heater for a defroster for a rear windshield. For these headlights, wipers, blower fans, etc., if the power supply voltage changes, the headlight blinks, the wiper operating speed changes, and the blower fan rotation speed changes (fan noise change). A constant voltage is required.

  The battery unit U is provided with connection paths 21 and 22 for connecting the terminals T1 and T2 and the lithium ion storage battery 10 to each other as an in-unit electrical path. Of these, the MOS switch 15 is provided in the first connection path 21 connecting the first terminal T1 and the second terminal T2, and the connection point N1 (battery connection point) on the first connection path 21 and the lithium ion storage battery 10 are connected. The SMR switch 16 is provided in the second connection path 22 that connects the two. Each of these switches 15 and 16 includes 2 × n MOSFETs (semiconductor switches) and is connected in series so that the parasitic diodes of the pair of MOSFETs are opposite to each other. When the switches 15 and 16 are turned off, the parasitic diode completely cuts off the current flowing through the path where the switches are provided.

  Further, in the present power supply system, a bypass path 23 is provided that enables the lead storage battery 41 and the rotating electrical machine 40 to be connected without using the MOS switch 15. Specifically, the bypass path 23 bypasses the battery unit U and is connected to the first terminal T1 (path connected to the lead storage battery 41 and the like) and the electrical path connected to the second terminal T2. It is provided so as to be electrically connected to the (path connected to the rotating electrical machine 40). On the bypass path 23, a bypass switch 24 is provided that switches the connection between the lead storage battery 41 side and the rotating electrical machine 40 side to a cut-off state or a conductive state. The bypass switch 24 is a normally closed relay switch. Note that the bypass path 23 and the bypass switch 24 may be provided so as to bypass the MOS switch 15 in the battery unit U.

  The control device 20 switches the switches 15 and 16 between on (closed) and off (open). In this case, the control device 20 is at the time of discharging (load driving) for supplying power to the electric load 45, charging at the time of charging by supplying power from the rotating electrical machine 40, or by idling stop control. The on / off state of the MOS switch 15 is controlled depending on whether the engine is automatically restarted by the rotating electrical machine 40 when the engine is stopped. The SMR switch 16 is basically maintained in an on (closed) state when the vehicle is running, and is turned off (opened) when any abnormality occurs in the battery unit U, the rotating electrical machine 40, or the like. .

  The control device 20 is connected to an ECU 30 outside the battery unit. That is, the control device 20 and the ECU 30 are connected via a communication network such as CAN and can communicate with each other, and various data stored in the control device 20 and the ECU 30 can be shared with each other. The ECU 30 is an electronic control device having a function of performing idling stop control. As is well known, the idling stop control is to automatically stop the engine when a predetermined automatic stop condition is satisfied, and to restart the engine when the predetermined restart condition is satisfied under the automatic stop state.

  The rotating electrical machine 40 generates power using the rotational energy of the engine output shaft. Specifically, when the rotor is rotated by the engine output shaft in the rotating electrical machine 40, an alternating current is induced in the stator coil according to the exciting current flowing in the rotor coil, and is converted into a direct current by a rectifier (not shown). Then, the excitation current flowing through the rotor coil in the rotating electrical machine 40 is adjusted by the regulator, so that the voltage of the generated direct current is adjusted to be a predetermined adjustment voltage Vreg.

  The electric power generated by the rotating electrical machine 40 is supplied to the electric load 45 and also supplied to the lithium ion storage battery 10 and the lead storage battery 41. When the driving of the engine is stopped and no electric power is generated by the rotating electrical machine 40, electric power is supplied from the lithium ion storage battery 10 and the lead storage battery 41 to the electric load 45. The discharge amount from the lithium ion storage battery 10 and the lead storage battery 41 to the electric load 45 and the charge amount from the rotating electrical machine 40 are ranges in which SOC (the ratio of the actual charge amount to the full charge capacity, the charge rate) does not cause overcharge / discharge. It adjusts suitably so that it may become (SOC use field).

  In this case, the control device 20 limits overcharge protection by limiting the amount of charge to the lithium ion storage battery 10 so that the SOC of the lithium ion storage battery 10 is in a predetermined use range, and also controls the amount of discharge from the lithium ion storage battery 10. Implement protection control to limit and protect against overdischarge. Specifically, the control device 20 constantly obtains the detected value of the charge / discharge current I (input / output current) of the lithium ion storage battery 10 from the current sensor 25 (current detection unit), and the voltage sensor 26 (voltage detection unit). From the above, the detected value of the inter-terminal voltage V of the lithium ion storage battery 10 is always acquired. And the control apparatus 20 implements protection control based on the detected value of the voltage V between the terminals and the charging / discharging current I.

  When the voltage V between terminals of the lithium ion storage battery 10 is lower than the lower limit voltage, the control device 20 performs overdischarge protection of the lithium ion storage battery 10 by charging from the rotating electrical machine 40. The lower limit voltage may be set based on a voltage corresponding to the lower limit value of the SOC use region. Moreover, the control apparatus 20 implements overcharge protection by instructing variable setting of the adjustment voltage Vreg so that the inter-terminal voltage V of the lithium ion storage battery 10 does not rise above the upper limit voltage. The upper limit voltage may be set based on a voltage corresponding to the upper limit value of the SOC usage region.

  In addition, about the lead storage battery 41, the same protection control is implemented by another battery control apparatus which is not shown in figure. The control device 20 acquires the detected value of the charge / discharge current (input / output current) of the lead storage battery 41 from the battery control device that controls the lead storage battery 41. The control device 20 may be configured to acquire a detection value from a current sensor that detects a charge / discharge current of the lead storage battery 41.

  Further, in the present embodiment, the decelerating regeneration is performed in which the rotating electrical machine 40 is generated by the regenerative energy of the vehicle and is charged in both the storage batteries 10 and 41 (mainly the lithium ion storage battery 10). This deceleration regeneration is performed when conditions such as that the vehicle is decelerating and that fuel injection to the engine is cut are satisfied.

  In this embodiment, charging / discharging is performed by using the lithium ion storage battery 10 preferentially among the storage batteries 10 and 41. Specifically, at the time of regenerative power generation of the rotating electrical machine 40, the control device 20 turns off the MOS switch 15 and turns on the SMR switch 16, so that the generated power in the rotating electrical machine 40 is preferentially lithium. The ion storage battery 10 is charged. Further, when the rotating electrical machine 40 is driven, the control device 20 turns off the MOS switch 15 and turns on the SMR switch 16, so that the power consumption of the rotating electrical machine 40 is preferentially reduced from the lithium ion storage battery 10. Discharged.

  Here, there is a concern that the lead storage battery 41, the electrical load 45, and the terminal T1 (connection point N2) are disconnected while the vehicle is stopped or traveling. The disconnection between the lead storage battery 41 and the connection point N2 is caused by loose connection due to vibrations caused by traveling of the vehicle, disconnection of the wire harness, or artificial flaws during maintenance of the vehicle. The ECU 30 sets the vehicle in the evacuation traveling state on condition that the connection between the lead storage battery 41, the lithium ion storage battery 10, and the electric load 45 is disconnected.

  In the vehicle, when coasting with the engine stopped, the operation of the rotating electrical machine 40 connected to the engine output shaft is also stopped. The rotating electrical machine 40 is an external excitation type generator that starts power generation when an excitation current flows. When the lead storage battery 41 is disconnected, the excitation current for the rotating electrical machine 40 is output from the lithium ion storage battery 10. However, as shown in FIG. 2, the lithium ion storage battery 10 has a feature that the lower the SOC, the lower the open-circuit voltage (OCV). For this reason, there is a concern that an excitation current necessary for starting the power generation of the rotating electrical machine 40 cannot be supplied from the lithium ion storage battery 10. In addition, there is a concern that a failure has occurred in the rotating electrical machine 40 and regenerative power generation in the rotating electrical machine 40 cannot be performed.

  Therefore, in the present embodiment, the consumed capacity consumed in the electric load 45 is calculated in advance until the vehicle is set in the retreat travel mode and the vehicle is stopped. And based on the consumed capacity, the minimum capacity | capacitance (refer FIG. 2) of the lithium ion storage battery 10 is set, and it prohibits that the charge capacity of the lithium ion storage battery 10 becomes less than minimum capacity. By performing such control, the vehicle can be safely stopped even if the lead storage battery 41 is disconnected.

  FIG. 3 is a flowchart showing the minimum capacity setting process in the present embodiment. This process is performed by the control device 20 at predetermined intervals.

  In step S01, the vehicle speed is acquired from the ECU 30. The ECU acquires the vehicle speed based on the vehicle speed signal input from the vehicle speed sensor. In step S02, based on the vehicle speed, a time until the vehicle stops during the evacuation travel is calculated. Specifically, the control device 20 includes a map (FIG. 4) that represents the correspondence between the vehicle speed and the stop time, and calculates the stop time of the vehicle based on the vehicle speed and the map shown in FIG. For example, when the vehicle speed is 100 km / h, the stop time is calculated as 120 sec.

  In step S03, the total value (consumption current) of the load current in the electric load 45 is calculated. Specifically, when the rotating electrical machine 40 is stopped, the sum of the input / output current of the lithium ion storage battery 10 and the input / output current of the lead storage battery 41 is calculated as the consumption current in the electric load 45. Further, during driving of the rotating electrical machine 40, a value obtained by subtracting the input current of the rotating electrical machine 40 from the sum of the input / output current of the lithium ion storage battery 10 and the input / output current of the lead storage battery 41 is the current consumption in the electric load 45. Calculate as Further, during regenerative power generation of the rotating electrical machine 40, the value obtained by adding the output current of the rotating electrical machine 40 to the sum of the input / output current of the lithium ion storage battery 10 and the input / output current of the lead storage battery 41 is Calculated as load current.

  In step S04, the product of the vehicle stop time calculated in step S02 and the current consumption of the electric load 45 calculated in step S03 is the consumption capacity [Ah] consumed in the electric load 45 until the vehicle stops. calculate. The consumption capacity calculated in step S05 is set to the minimum capacity of the lithium ion storage battery 10, and the process ends. The processing in steps S02 to S04 corresponds to a “setting unit”.

  FIG. 5 is a flowchart showing the discharge prohibiting process of the lithium ion storage battery 10 in the present embodiment. This process is performed by the control device 20 at predetermined intervals.

  In step S11, it is determined whether or not regenerative power generation is being performed. If regenerative power generation is being performed (S11: YES), in step S12, the SMR switch 16 is turned on and the process is terminated. When regenerative power generation is not being performed (S11: NO), in step S13, it is determined whether or not the charge capacity Ah (Li) of the lithium ion storage battery 10 is equal to or greater than the minimum capacity. When the charge capacity Ah (Li) of the lithium ion storage battery 10 is equal to or greater than the minimum capacity (S13: YES), the process is terminated. When the charge capacity Ah (Li) of the lithium ion storage battery 10 is less than the minimum capacity (S13: NO), the discharge in the lithium ion storage battery 10 is prohibited by turning off the SMR switch 16 in step S14. Exit. The processing of steps S13 and S14 corresponds to a “prohibited part”.

  The effects of this embodiment will be described below.

  The minimum capacity of the lithium ion storage battery 10 is set based on the power consumption consumed in the electric load 45 until the vehicle is stopped. With such a configuration, even if the lead storage battery 41 becomes unusable, the electric load 45 can be operated continuously until the vehicle stops. For this reason, the safety | security of a vehicle can be improved.

  Specifically, while the vehicle is traveling, the power consumption is estimated based on the current consumption flowing to the electric load 45, and the minimum capacity is set based on the estimated value. By setting the minimum capacity in this way, the area that can be used when the power system is normal in the SOC usage area of the lithium ion storage battery 10 while ensuring the safety of the vehicle (the usage area in FIG. 2). Therefore, it is possible to increase the power efficiency of the power supply system.

  Furthermore, a configuration is used in which the stop time required to complete the retreat travel is estimated based on the vehicle speed, the consumed capacity is estimated based on the estimated value of the stop time, and the minimum capacity is set based on the estimated value It was. Thereby, even when the vehicle is traveling at high speed, the electric load 45 can be operated continuously until the vehicle stops. More specifically, the product of the current value of the load current and the estimated value of the stop time is calculated as the consumed capacity, and the minimum capacity is set to a value equal to the consumed capacity.

  The control device 20 sets the vehicle state to the retreat travel state on condition that the lead storage battery 41 is disconnected. This control makes it possible to safely stop the vehicle while suppressing the vehicle from continuously running in a situation where the lead storage battery 41 is disconnected.

  In the present embodiment, the lithium storage battery 10 is used as the “first storage battery”, and the lead storage battery 41 is used as the “second storage battery”. Here, by setting the full charge capacity of the lithium ion storage battery 10 to be smaller than the full charge capacity of the lead storage battery 41, the cost of the entire power supply system can be reduced. Furthermore, by configuring the lithium ion storage battery 10 to have a minimum capacity, even when the lead storage battery 41 is disconnected, it is possible to secure power until the evacuation travel is completed.

  As for the lithium ion storage battery 10 of this embodiment, an open end voltage falls with the fall of SOC. For this reason, when the SOC of the lithium ion storage battery 10 has a low value, it is difficult to output an excitation current from the lithium ion storage battery 10 to the rotating electrical machine 40 and start regenerative power generation in the rotating electrical machine 40. . Therefore, when the SOC of the lithium ion storage battery 10 is a low value, an excitation current is output from the lead storage battery 41 to the rotating electrical machine 40 in a situation where the lead storage battery 41 is not disconnected.

  However, in a situation where the lead storage battery 41 is disconnected, the excitation current cannot be output from the lead storage battery 41 to the rotating electrical machine 40. Therefore, by configuring the lithium ion storage battery 10 to have a minimum capacity, even when the lead storage battery 41 is disconnected and regenerative power generation is impossible, the power required until the evacuation travel is completed is obtained. It becomes possible to secure.

(Second Embodiment)
The in-vehicle power supply system of this embodiment has the same electrical configuration (FIG. 1) as that of the first embodiment. In 1st Embodiment, it was set as the structure which sets the minimum capacity | capacitance of the lithium ion storage battery 10 in the electric load 45 based on the consumption capacity consumed until a vehicle is stopped at the time of predetermined | prescribed evacuation driving | running | working of a vehicle. In the second embodiment, this is changed, and the control device 20 as the “setting unit” is the minimum capacity that is the minimum value of the charge amount of the lithium ion storage battery 10 based on the amount of power that can externally excite the rotating electrical machine 40. It was set as the structure which sets.

  That is, when the power supply system includes the rotating electrical machine 40 that is an external excitation type generator, the minimum capacity of the lithium ion storage battery 10 is set based on the amount of electric power that allows the rotating electrical machine 40 to be externally excited. With such a configuration, even when the lead storage battery 41 becomes unusable, regenerative power generation in the rotating electrical machine 40 can be performed. For this reason, it becomes possible to operate the electric load 45 continuously until the vehicle stops, and the safety of the vehicle can be improved.

(Other embodiments)
-In 1st Embodiment, it was set as the structure which calculates the sum of the input-output current of the lithium ion storage battery 10, the lead storage battery 41, and the rotary electric machine 40 as load current. This may be changed, and a predetermined value set in advance may be used as the load current instead of the current value.

  Moreover, it is good also as a structure which calculates the sum of the input / output current of the lithium ion storage battery 10 and the input / output current of the lead storage battery 41 as consumption current on condition that the rotary electric machine 40 is stopped.

  -In the above-mentioned embodiment, it was set as the composition which sets the state of a vehicle to the state of retreating on condition that connection with lead storage battery 41, lithium ion storage battery 10, and electric load 45 was removed, but this was changed, A configuration in which the state of the vehicle is set to a retreat traveling state under other conditions may be used.

  As the stop time, a predetermined value set in advance may be used instead of the vehicle speed. Further, when the vehicle speed is equal to or higher than a predetermined value, the stop time is set to the first stop time, and when the vehicle speed is less than the predetermined value, the stop time is set to the second stop time shorter than the first stop time. It may be a simple configuration.

  -Although the 1st storage battery was set as the lithium ion storage battery 10 and the 2nd storage battery was set as the lead storage battery 41, you may change this. For example, the first storage battery and the second storage battery may both be lead storage batteries. Moreover, you may use a nickel hydride storage battery etc. as a 1st storage battery.

  -It is good also as a structure provided only with one of the switches 15 and 16. FIG. In the case of the configuration including only the MOS switch 15, the discharge of the lithium ion storage battery 10 can be prohibited by turning off the MOS switch 15. Further, in the case of a configuration including only the SMR switch 16, the discharge of the lithium ion storage battery 10 can be prohibited by turning off the SMR switch 16.

  DESCRIPTION OF SYMBOLS 10 ... Lithium ion storage battery (1st storage battery), 20 ... Control apparatus, 41 ... Lead storage battery (2nd storage battery), 40 ... Rotary electric machine (generator), 45 ... Electric load.

Claims (9)

A first storage battery (10) and a second storage battery (41) connected in parallel to the first storage battery, and from the first storage battery and the second storage battery to the electric load (45) of the vehicle A control device (20) for an in-vehicle power supply system that performs supply,
A setting for setting a minimum capacity, which is a minimum value of the charge capacity of the first storage battery, based on a consumed capacity of the electric load until the vehicle is stopped during a predetermined retreat of the vehicle. And
A prohibition unit for prohibiting the charge capacity of the first storage battery from being less than the minimum capacity ,
The setting unit includes a calculation unit that calculates a total value of load currents flowing from the first storage battery and the second storage battery to the electric load while the vehicle is traveling, and a total value of the load currents. And a capacity setting unit configured to estimate the consumed capacity based on the estimated value of the consumed capacity and set the minimum capacity based on the estimated value of the consumed capacity . The setting unit is configured to estimate a stop time required until the vehicle is stopped during the predetermined retreat travel based on the speed of the vehicle, and based on the estimated value of the stop time, the consumption capacity to estimate, based on the estimated value of the consumption capacity control device according to claim 1, characterized in that and a capacitance setting unit for setting the minimum capacity. A first storage battery (10) and a second storage battery (41) connected in parallel to the first storage battery, and from the first storage battery and the second storage battery to the electric load (45) of the vehicle A control device (20) for an in-vehicle power supply system that performs supply,
A setting for setting a minimum capacity, which is a minimum value of the charge capacity of the first storage battery, based on a consumed capacity of the electric load until the vehicle is stopped during a predetermined retreat of the vehicle. And
A prohibition unit for prohibiting the charge capacity of the first storage battery from being less than the minimum capacity,
The setting unit is configured to estimate a stop time required until the vehicle is stopped during the predetermined retreat travel based on the speed of the vehicle, and based on the estimated value of the stop time, the consumption capacity And a capacity setting unit that sets the minimum capacity based on the estimated value of the consumed capacity.   The setting unit is based on a calculation unit that calculates a total value of load currents flowing from the first storage battery and the second storage battery to the electric load while the vehicle is traveling, and the speed of the vehicle. , Based on a product of an estimation unit that estimates a stop time required until the vehicle is stopped when the predetermined retreat travel is performed, a total value of the load current, and an estimate value of the stop time, The control device according to claim 1, further comprising: a capacity setting unit that estimates the consumed capacity and sets the minimum capacity based on an estimated value of the consumed capacity. . A first storage battery (10) and a second storage battery (41) connected in parallel to the first storage battery, and from the first storage battery and the second storage battery to the electric load (45) of the vehicle A control device (20) for an in-vehicle power supply system that performs supply,
A setting for setting a minimum capacity, which is a minimum value of the charge capacity of the first storage battery, based on a consumed capacity of the electric load until the vehicle is stopped during a predetermined retreat of the vehicle. And
A prohibition unit for prohibiting the charge capacity of the first storage battery from being less than the minimum capacity,
The setting unit is based on a calculation unit that calculates a total value of load currents flowing from the first storage battery and the second storage battery to the electric load while the vehicle is traveling, and the speed of the vehicle. , Based on a product of an estimation unit that estimates a stop time required until the vehicle is stopped when the predetermined retreat travel is performed, a total value of the load current, and an estimate value of the stop time, And a capacity setting unit configured to estimate the consumed capacity and set the minimum capacity based on the estimated value of the consumed capacity. The control device according to any one of claims 1 to 5 , wherein the predetermined retreat travel is performed in a state where an engine mounted on the vehicle is stopped. The vehicle includes a second battery, the condition that the connection is outside of the first battery and the electrical load, to claim 1, characterized in that it is set to a state of the predetermined evacuation travel 6 The control device according to any one of the above. The first storage battery is a lithium ion storage battery, the second storage battery is a lead storage battery, and the full charge capacity of the first storage battery is set smaller than the full charge capacity of the second storage battery. control device according to any one of claims 1 to 7, characterized. The in-vehicle power supply system includes a generator (40) that is connected to the first storage battery and the second storage battery and generates power, thereby charging the first storage battery and the second storage battery,
The control device according to claim 8 , wherein the generator is an external excitation type generator that generates power by being supplied with an excitation current.

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