JP7005998B2 - Auxiliary battery controller - Google Patents

Description

The present invention relates to an auxiliary battery control device.

A vehicle equipped with an engine and using gasoline as a power source is equipped with an auxiliary battery that supplies electric power to auxiliary equipment such as an ECU (Electronic Control Unit) and electrical components. In addition to vehicle drive batteries that supply electric power to vehicle drive motors, vehicles that use electricity as a power source, such as hybrid vehicles and electric vehicles, are equipped with auxiliary battery that supplies electric power to auxiliary equipment. To.

The auxiliary battery supplies electric power to auxiliary equipment such as an ECU not only while the vehicle is running but also when the ignition is off, and a current flows from the auxiliary equipment battery to the auxiliary equipment. Further, if the power supply to the ECU is cut off during the ignition off, some operations such as the clock and setting items are initialized, so it is desirable not to cut off the power supply to the ECU as much as possible.

The charge rate (SOC (State Of Charge)) of the auxiliary battery is estimated from the open circuit voltage of the auxiliary battery. Further, the full charge capacity of the auxiliary battery is calculated by using the open circuit voltage of the auxiliary battery. Therefore, in order to acquire the accurate charge rate and full charge capacity of the auxiliary battery, it is desirable to acquire the accurate open circuit voltage of the auxiliary battery. In order to obtain an accurate open circuit voltage of the auxiliary battery, it is desirable to measure the open circuit voltage of the auxiliary battery in a state where no current is flowing through the auxiliary battery.

The techniques described in Patent Documents 1 to 3 are known as related techniques.

Japanese Unexamined Patent Publication No. 2007-192723 Japanese Unexamined Patent Publication No. 2006-050779 Japanese Unexamined Patent Publication No. 2006-174619

However, as described above, the auxiliary battery supplies electric power to the auxiliary equipment such as the ECU not only while the vehicle is running but also when the ignition is off, and a current flows from the auxiliary equipment battery to the auxiliary equipment. Therefore, it is difficult to accurately obtain the open circuit voltage of the auxiliary battery, and it is difficult to accurately obtain the charge rate and the full charge capacity of the auxiliary battery.

An object of the present invention is to provide an auxiliary battery control device for accurately determining the open circuit voltage of an auxiliary battery that supplies power to an auxiliary machine without stopping the auxiliary machine being driven. ..

The auxiliary battery control device according to the present invention includes an auxiliary battery, a voltage sensor, a first switch, and a control unit. The auxiliary battery supplies power to the auxiliary equipment. The voltage sensor measures the voltage of the auxiliary battery. The first switch is connected in series with the auxiliary battery. The control unit shuts off the first switch when the power conversion device that converts the power of the power supply unit that supplies the power for driving the axle into the power supplied to the auxiliary equipment is driven, and the first switch is turned off. The first open circuit voltage of the auxiliary battery is obtained after the lapse of a predetermined time.

According to the auxiliary battery control device according to one embodiment, the open circuit voltage of the auxiliary battery that supplies power to the auxiliary machine can be accurately obtained without stopping the auxiliary machine being driven.

It is a schematic system configuration diagram of the vehicle including the auxiliary battery control device according to 1st Embodiment. It is an exemplary flow diagram of the open circuit voltage acquisition process performed by the auxiliary battery control device according to the first embodiment. It is a schematic system configuration diagram of the vehicle including the auxiliary battery control device according to the 2nd Embodiment. It is an exemplary flow diagram of the open circuit voltage acquisition process performed by the auxiliary battery control device according to the second embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings.

<First Embodiment>
FIG. 1 is a schematic system configuration diagram of a vehicle including an auxiliary battery control device according to the first embodiment. The vehicle 1 shown in FIG. 1 is a vehicle equipped with an engine 15 and using gasoline as a power source. The vehicle 1 includes an auxiliary battery pack 11, auxiliary machines 12-1 to 12-N (N is an integer of 1 or more), a traveling control ECU 13, an alternator 14, and an engine 15. In the following description, if the auxiliary machines 12-1 to 12-N are not particularly distinguished, they may be referred to as auxiliary machines 12.

The auxiliary battery pack 11 is an example of the auxiliary battery control device according to the first embodiment. The auxiliary battery pack 11 includes an auxiliary battery 111, a voltage sensor 112, a current sensor 113, a first switch 114, a second switch 115, a resistance 116, and an auxiliary battery control ECU 117.

The auxiliary battery 111 is a secondary battery that supplies electric power to the auxiliary machine 12. The auxiliary battery 111 is, for example, a lithium ion battery, a nickel hydrogen battery, an electric double layer capacitor, or the like.

The voltage sensor 112 is configured by, for example, an IC (Integrated Circuit). The voltage sensor 112 measures the voltage of the auxiliary battery 111 and outputs the measured value to the auxiliary battery control ECU 117.

The current sensor 113 is composed of, for example, a Hall element or a shunt resistor. The current sensor 113 measures the current flowing through the auxiliary battery 111, and outputs the measured value to the auxiliary battery control ECU 117.

The first switch 114 and the second switch 115 are semiconductor switches such as, for example, an electromagnetic relay and a MOSFET (Metal Oxide Semiconductor Field Effect Transistor). The first switch 114 is connected in series to the auxiliary battery 111. The second switch 115 is connected in series to the resistor 116 connected in parallel to the auxiliary battery 111.

The auxiliary battery control ECU 117 is an example of a control unit according to the first embodiment. The auxiliary battery control ECU 117 is composed of, for example, a CPU (Central Processing Unit), a multi-core CPU, or a programmable device (FPGA (Field Programmable Gate Array), PLD (Programmable Logic Device), or the like). The auxiliary battery control ECU 117 controls the operation of each part included in the auxiliary battery pack 11 and communicates with the travel control ECU 13.

The auxiliary machine 12 is various ECUs, electrical components, and the like. Depending on the embodiment, the travel control ECU 13 may be included in the auxiliary machine 12.

The travel control ECU 13 controls the travel of the vehicle 1, such as starting, accelerating, and decelerating. For example, the travel control ECU 13 controls various devices such as the engine 15 based on control signals corresponding to the operation of the accelerator pedal and the brake pedal by the user of the vehicle 1. The travel control ECU 13 communicates with various ECUs including the auxiliary battery control ECU 117.

The alternator 14 is an example of a power conversion device that converts the power of the power supply unit that supplies power for driving the axle (not shown) of the vehicle 1 into the power supplied to the auxiliary machine 12. Further, the engine 15 is an example of the power supply unit. The alternator 14 uses the rotation of the engine 15 as a power source to generate AC power to be supplied to the auxiliary machine 12. The engine 15 rotates the axle of the vehicle 1.

The processing flow in which the auxiliary battery control ECU 117, which is an example of the control unit according to the first embodiment, obtains the open circuit voltage of the auxiliary battery 111 will be described below with reference to FIG. FIG. 2 is an exemplary flow diagram of an open circuit voltage acquisition process executed by the auxiliary battery control device according to the first embodiment. In step S101, the auxiliary battery control ECU 117 determines whether or not the alternator 14 is being driven. For example, if the ignition key for driving the engine 15 is turned on (IG-ON) and the vehicle 1 is running, the alternator 14 is being driven. Whether or not the alternator 14 is being driven can be confirmed by inquiring the traveling control ECU 13 from the auxiliary battery control ECU 117.

When it is determined that the alternator 14 is stopped (“NO” in step S101), the series of processes ends. On the other hand, when it is determined that the alternator 14 is being driven (“YES” in step S101), the series of processes proceeds to step S102.

In step S102, the auxiliary battery control ECU 117 determines whether or not the vehicle speed of the vehicle 1 is equal to or higher than a predetermined value. Whether or not the vehicle speed of the vehicle 1 is equal to or higher than a predetermined value can be confirmed by inquiring the traveling control ECU 13 from the auxiliary battery control ECU 117.

When it is determined that the vehicle speed of the vehicle 1 is less than a predetermined value (“NO” in step S102), a series of processes is completed. On the other hand, when it is determined that the vehicle speed of the vehicle 1 is equal to or higher than a predetermined value (“YES” in step S102), the series of processes proceeds to step S103.

In step S103, the auxiliary battery control ECU 117 shuts off (turns off) the first switch 114 and the second switch 115. As a result, no current flows through the auxiliary battery 111. In step S104, the auxiliary battery control ECU 117 obtains the open circuit voltage (first open circuit voltage) of the auxiliary battery 111 after the lapse of the first predetermined time. Specifically, for example, the auxiliary battery control ECU 117 acquires the voltage of the auxiliary battery 111 measured by the voltage sensor 112 after the elapse of the polarization elimination time of the auxiliary battery 111, that is, the open circuit voltage of the auxiliary battery 111. do. Further, for example, the auxiliary battery control ECU 117 estimates the open circuit voltage of the auxiliary battery 111 from the amount of change in the voltage of the auxiliary battery 111 measured by the voltage sensor 112 after a predetermined time has elapsed.

The method of estimating the open circuit voltage of the auxiliary battery 111 from the amount of change in the voltage of the auxiliary battery 111 is, for example, measured after a third predetermined time elapses after the first switch 114 and the second switch 115 are shut off. The voltage V3 of the auxiliary battery 111 and the fourth predetermined time (the fourth predetermined time is longer than the third predetermined time) have elapsed since the first switch 114 and the second switch 115 were shut off. Using the voltage V4 of the auxiliary battery 111, the open circuit voltage Vocv is estimated from the equation of Vocv = V3 + α × (V4-V3). In addition, α is a correction coefficient obtained in advance by experiments and simulations.

As described above, when the alternator 14 is being driven, the auxiliary battery control ECU 117 acquires the open circuit voltage of the auxiliary battery 111. When the alternator 14 is being driven, power is supplied from the alternator 14 to the auxiliary machine 12. Therefore, even if the first switch 114 is cut off and the power of the auxiliary battery 111 is not supplied to the auxiliary machine 12, the auxiliary machine 12 being driven does not stop. Therefore, according to the auxiliary battery control device according to the first embodiment, it is possible to accurately obtain the open circuit voltage of the auxiliary battery that supplies power to the auxiliary without stopping the driving auxiliary. can.

Further, the vehicle speed of the vehicle 1 is proportional to the rotation speed of the engine 15, and the amount of power generated by the alternator 14 is proportional to the rotation speed of the engine 15. Therefore, when the vehicle speed of the vehicle 1 is less than a predetermined value, the alternator 14 does not generate a sufficient amount of power generation necessary for driving the auxiliary machine 12. If the alternator 14 does not generate enough power to drive the auxiliary machine 12, the first switch 114 is shut off and the power supply from the auxiliary machine battery 111 to the auxiliary machine 12 is stopped. Then, the auxiliary machine 12 being driven may stop due to insufficient power. However, in the auxiliary battery control device according to the embodiment, when the vehicle speed of the vehicle 1 is equal to or higher than a predetermined value, the first switch 114 is shut off, so that the auxiliary device 12 being driven may stop due to insufficient power. do not have. For the above-mentioned reason, the auxiliary battery control ECU 117 determines in step S102 whether or not the vehicle speed of the vehicle 1 is equal to or higher than a predetermined value, but instead determines the rotation speed of the engine 15 or the power generation amount of the alternator 14. It may be determined whether or not it is equal to or greater than the value.

In step S105, the auxiliary battery control ECU 117 estimates the charge rate of the auxiliary battery 111 from the first open circuit voltage. Specifically, the auxiliary battery control ECU 117 estimates the charge rate corresponding to the first open circuit voltage by using a table or a function showing the correspondence between the open circuit voltage of the auxiliary battery 111 and the charge rate. ..

In step S106, the auxiliary battery control ECU 117 closes (turns on) the second switch 115. As a result, a current flows from the auxiliary battery 111 to the resistor 116. In step S107, the auxiliary battery control ECU 117 passes a current from the auxiliary battery 111 to the resistor 116 for a second predetermined time, and obtains a current integrated value of the current flowing through the auxiliary battery 111 measured by the current sensor 113.

After obtaining the current integrated value, in step S108, the auxiliary battery control ECU 117 shuts off (turns off) the second switch 115. Then, in step S109, the auxiliary battery control ECU 117 obtains the open circuit voltage (second open circuit voltage) of the auxiliary battery 111 after the lapse of the first predetermined time. An example of a specific method for obtaining the open circuit voltage of the auxiliary battery 111 is as described above.

In step S110, the auxiliary battery control ECU 117 has a first charge rate estimated using the first open circuit voltage, a second charge rate estimated using the second open circuit voltage, and a current. The full charge capacity of the auxiliary battery 111 is calculated using the integrated value. Specifically, the auxiliary battery control ECU 117 calculates the full charge capacity of the auxiliary battery 111 by calculating the current integrated value / (first charge rate − second charge rate) × 100.

As described above, according to the auxiliary battery control device according to the first embodiment, the charge rate and the full charge capacity of the auxiliary battery can be accurately obtained by using the accurately obtained open circuit voltage.

<Second embodiment>
FIG. 3 is a schematic system configuration diagram of a vehicle including an auxiliary battery control device according to a second embodiment. In FIG. 3, the same components as those shown in FIG. 1 are designated by the same reference numerals. The vehicle 1A shown in FIG. 3 is a vehicle that uses electricity as a power source, such as an electric forklift, a hybrid vehicle, and an electric vehicle. The vehicle 1A includes an auxiliary battery pack 11, auxiliary machines 12-1 to 12-N, a traveling control ECU 13, and a DC / DC (Direct Current / Direct Current) converter 14A. Further, the vehicle 1A further includes a vehicle driving battery 15A, a vehicle driving battery switch 16, an inverter 17, and a vehicle driving motor 18.

The auxiliary battery pack 11 is an example of the auxiliary battery control device according to the second embodiment. Further, the auxiliary battery control ECU 117 is an example of a control unit according to the second embodiment.

The DC / DC converter 14A is an example of a power conversion device that converts the power of the power supply unit that supplies power for driving the axle (not shown) of the vehicle 1A into the power supplied to the auxiliary device 12. The DC / DC converter 14A converts the electric power of the vehicle driving battery 15A into the electric power supplied to the auxiliary machine 12. The output modes of the DC / DC converter 14A include a low output mode that converts the power of the vehicle drive battery 15A to relatively low power and a high output that converts the power of the vehicle drive battery 15A to relatively high power. Modes and may be included. The output mode of the DC / DC converter 14A is changed by the instruction of the traveling control ECU 13.

The vehicle drive battery 15A is an example of a power supply unit. The vehicle drive battery 15A supplies electric power to the vehicle drive motor 18 via the inverter 17. Further, the vehicle driving battery 15A can supply electric power to the auxiliary device 12 via the DC / DC converter 14A. The vehicle drive battery 15A is, for example, a lead battery. The vehicle drive battery 15A can be a high voltage battery as compared to the auxiliary battery 111.

The vehicle drive battery switch 16 is, for example, a semiconductor switch such as an electromagnetic relay or a MOSFET. The vehicle drive battery switch 16 is connected in series to the vehicle drive battery 15A.

The inverter 17 converts the DC power supplied from the vehicle drive battery 15A into AC power, and supplies the AC power to the vehicle drive motor 18. The vehicle drive motor 18 is a motor that drives the axle (not shown) of the vehicle 1A. For example, when the vehicle 1A is a hybrid vehicle, the vehicle drive motor 18 starts an engine (not shown) or drives an axle via a transmission (not shown).

A processing flow in which the auxiliary battery control ECU 117, which is an example of the control unit according to the second embodiment, obtains the open circuit voltage of the auxiliary battery 111 will be described below with reference to FIG. FIG. 4 is an exemplary flow diagram of the open circuit voltage acquisition process executed by the auxiliary battery control device according to the second embodiment. In step S201, the auxiliary battery control ECU 117 determines whether or not the DC / DC converter 14A is being driven. For example, if the ignition key that supplies the electric power of the vehicle driving battery 15A to the vehicle driving motor 18 is turned on (IG-ON) and the vehicle 1A is running, the DC / DC converter 14A is being driven. Whether or not the DC / DC converter 14A is being driven can be confirmed by inquiring the traveling control ECU 13 from the auxiliary battery control ECU 117.

When it is determined that the DC / DC converter 14A is being driven (“YES” in step S201), in step S202, the auxiliary battery control ECU 117 determines whether the output mode of the DC / DC converter 14A is the high output mode. Is determined. Whether or not the output mode of the DC / DC converter 14A is the high output mode can be confirmed by inquiring the auxiliary battery control ECU 117 to the traveling control ECU 13.

When it is determined that the output mode of the DC / DC converter 14A is the high output mode (“YES” in step S202), the series of processes proceeds to step S204. On the other hand, when it is determined that the output mode of the DC / DC converter 14A is the low output mode (“NO” in step S202), the series of processes proceeds to step S203.

In step S203, the auxiliary battery control ECU 117 changes the output mode of the DC / DC converter 14A from the low output mode to the high output mode. Specifically, the auxiliary battery control ECU 117 requests the traveling control ECU 13 to change the output mode of the DC / DC converter 14A from the low output mode to the high output mode. The travel control ECU 13 changes the output mode of the DC / DC converter 14A from the low output mode to the high output mode according to the request of the auxiliary battery control ECU 117. When the auxiliary battery control ECU 117 changes the output mode of the DC / DC converter 14A from the low output mode to the high output mode, the series of processes proceeds to step S204.

In step S204, the auxiliary battery control ECU 117 shuts off (turns off) the first switch 114 and the second switch 115. As a result, no current flows through the auxiliary battery 111. In step S205, the auxiliary battery control ECU 117 obtains the open circuit voltage (first open circuit voltage) of the auxiliary battery 111 after the lapse of the first predetermined time. An example of a specific method for obtaining the open circuit voltage of the auxiliary battery 111 is as described above in the first embodiment.

As described above, when the DC / DC converter 14A is being driven, the auxiliary battery control ECU 117 acquires the open circuit voltage of the auxiliary battery 111. When the DC / DC converter 14A is being driven, the electric power of the vehicle driving battery 15A is supplied to the auxiliary machine 12 via the DC / DC converter 14A. Therefore, even if the first switch 114 is cut off and the power of the auxiliary battery 111 is not supplied to the auxiliary machine 12, the auxiliary machine 12 being driven does not stop. Therefore, according to the auxiliary battery control device according to the second embodiment, it is possible to accurately obtain the open circuit voltage of the auxiliary battery that supplies power to the auxiliary without stopping the driving auxiliary. can.

Further, as described above, when the output mode of the DC / DC converter 14A is the high output mode, the auxiliary battery control ECU 117 acquires the offset value of the voltage sensor 112. It is assumed that when the output mode of the DC / DC converter 14A is the low output mode, the first switch 114 is shut off and the power supply from the auxiliary battery 111 to the auxiliary 12 is stopped. Under this assumption, if the user further drives a high-load auxiliary machine 12 such as an air conditioner, the driving auxiliary machine 12 may stop due to insufficient power. However, in the auxiliary battery control device according to the embodiment, when the output mode of the DC / DC converter 14A is the high output mode, the first switch 114 is shut off, so that the auxiliary machine 12 being driven is due to insufficient power. There is no risk of stopping.

In steps S206 to S211 the auxiliary battery control ECU 117 performs the same processing as in steps S105 to S110. That is, the auxiliary battery control ECU 117 estimates the first charge rate using the first open circuit voltage. The auxiliary battery control ECU 117 acquires the current integrated value. The auxiliary battery control ECU 117 obtains the second open circuit voltage in a state where no current is flowing through the auxiliary battery 111, and estimates the second charge rate using the second open circuit voltage. Then, the auxiliary battery control ECU 117 calculates the full charge capacity using the first charge rate, the second charge rate, and the current integrated value.

As described above, according to the auxiliary battery control device according to the second embodiment, the charge rate and the full charge capacity of the auxiliary battery can be accurately obtained by using the accurately obtained open circuit voltage.

Next, when it is determined that the DC / DC converter 14A is stopped (“NO” in step S201), the series of processes proceeds to step S212. For example, if the ignition key is turned off (IG-OFF) and the vehicle 1A is stopped, the DC / DC converter 14A is stopped.

In step S212, the auxiliary battery control ECU 117 drives the vehicle driving battery 15A and the DC / DC converter 14A. Specifically, the auxiliary battery control ECU 117 requests the travel control ECU 13 to drive the vehicle driving battery 15A and the DC / DC converter 14A. The travel control ECU 13 drives the vehicle drive battery 15A by closing (turning on) the vehicle drive battery switch 16 according to the request of the auxiliary battery control ECU 117. Further, the traveling control ECU 13 drives the DC / DC converter 14A in accordance with the request of the auxiliary battery control ECU 117. In order to avoid the possibility that the auxiliary machine 12 being driven will stop due to insufficient power, it is desirable that the traveling control ECU 13 drives the DC / DC converter 14A in the high output mode. Through the process of step S212, the electric power of the vehicle driving battery 15A is supplied to the auxiliary machine 12 via the DC / DC converter 14A. When the auxiliary battery control ECU 117 drives the vehicle drive battery 15A and the DC / DC converter 14A, the series of processes proceeds to step S213.

In steps S213 to S220, the auxiliary battery control ECU 117 performs the same processing as in steps S204 to S211. That is, the auxiliary battery control ECU 117 obtains the first open circuit voltage in a state where no current is flowing through the auxiliary battery 111, and estimates the first charge rate using the first open circuit voltage. The auxiliary battery control ECU 117 acquires the current integrated value. The auxiliary battery control ECU 117 obtains the second open circuit voltage in a state where no current is flowing through the auxiliary battery 111, and estimates the second charge rate using the second open circuit voltage. Then, the auxiliary battery control ECU 117 calculates the full charge capacity using the first charge rate, the second charge rate, and the current integrated value.

In step S221, the auxiliary battery control ECU 117 closes (turns on) the first switch 114. As a result, the electric power of the auxiliary battery 111 is supplied to the auxiliary 12 again.

In step S222, the auxiliary battery control ECU 117 stops the vehicle driving battery 15A and the DC / DC converter 14A. Specifically, the auxiliary battery control ECU 117 requests the travel control ECU 13 to stop the vehicle driving battery 15A and the DC / DC converter 14A. The travel control ECU 13 stops the vehicle drive battery 15A by shutting off (turning off) the vehicle drive battery switch 16 according to the request of the auxiliary battery control ECU 117. Further, the traveling control ECU 13 stops the DC / DC converter 14A according to the request of the auxiliary battery control ECU 117.

As described above, according to the auxiliary battery control device according to the second embodiment, the auxiliary machine that supplies power to the auxiliary machine without stopping the driving auxiliary machine even during IG-OFF. The open circuit voltage of the battery can be accurately obtained. Further, according to the auxiliary battery control device according to the second embodiment, the charge rate and the full charge capacity of the auxiliary battery can be determined by using the accurately obtained open circuit voltage even during IG-OFF. It can be calculated accurately.

The present invention is not limited to the above embodiments, and various improvements and changes can be made without departing from the gist of the present invention.

For example, the control unit according to the embodiment may be a travel control ECU 13. In this case, the traveling control ECU 13 may perform the same processing as the processing performed by the auxiliary battery control ECU 117 described above with reference to, for example, FIG. 2 or FIG. According to such an embodiment, for example, even when the auxiliary battery 111 is a lead battery and the auxiliary battery pack 11 does not include the auxiliary battery control ECU 117, the auxiliary machine 12 being driven is not stopped. , The open circuit voltage of the auxiliary battery 111 that supplies power to the auxiliary 12 can be accurately obtained.

1, 1A Vehicle 11 Auxiliary battery pack 12 (12-1 to 12-N) Auxiliary 13 Travel control ECU
14 Alternator 14A DC / DC converter 15 Engine 15A Vehicle drive battery 16 Vehicle drive battery switch 17 Inverter 18 Vehicle drive motor 111 Auxiliary battery 112 Voltage sensor 113 Current sensor 114 First switch 115 Second switch 116 Resistance 117 Auxiliary battery control ECU

Claims (5)

Auxiliary battery that supplies power to auxiliary equipment and
A voltage sensor that measures the voltage of the auxiliary battery and
The first switch connected in series to the auxiliary battery and
When the power conversion device that converts the power of the power supply unit that supplies the power for driving the axle into the power to be supplied to the auxiliary machine is being driven, the first switch is shut off and the first predetermined A control unit that obtains the first open circuit voltage of the auxiliary battery after a lapse of time, and
Equipped with
The power supply unit is an engine.
The power converter is an alternator.
The control unit shuts off the first switch when the rotation speed of the engine or the power generation amount of the alternator is equal to or higher than a predetermined value, and after the lapse of the first predetermined time, the first of the auxiliary battery. Auxiliary battery control device, characterized in that the open circuit voltage of is obtained. Auxiliary battery that supplies power to auxiliary equipment and
A voltage sensor that measures the voltage of the auxiliary battery and
The first switch connected in series to the auxiliary battery and
When the power conversion device that converts the power of the power supply unit that supplies the power for driving the axle into the power to be supplied to the auxiliary machine is being driven, the first switch is shut off and the first predetermined A control unit that obtains the first open circuit voltage of the auxiliary battery after a lapse of time, and
Equipped with
The power supply unit is a vehicle driving battery.
The power converter is a DC / DC converter.
When the DC / DC converter is being driven, the control unit shuts off the first switch, and after the lapse of the first predetermined time, obtains the first open circuit voltage of the auxiliary battery.
When the ignition key that supplies the electric power of the vehicle drive battery to the vehicle drive motor is turned off, the control unit may perform the control unit.
To drive the vehicle driving battery and the DC / DC converter,
The first switch is shut off,
After the lapse of the first predetermined time, the first open circuit voltage of the auxiliary battery is obtained.
Close the first switch and
An auxiliary battery control device comprising stopping the vehicle driving battery and the DC / DC converter. Auxiliary battery that supplies power to auxiliary equipment and
A voltage sensor that measures the voltage of the auxiliary battery and
The first switch connected in series to the auxiliary battery and
When the power conversion device that converts the power of the power supply unit that supplies the power for driving the axle into the power to be supplied to the auxiliary machine is being driven, the first switch is shut off and the first predetermined A control unit that obtains the first open circuit voltage of the auxiliary battery after a lapse of time, and
Equipped with
The power supply unit is a vehicle driving battery.
The power converter is a DC / DC converter.
When the DC / DC converter is being driven, the control unit shuts off the first switch, and after the lapse of the first predetermined time, obtains the first open circuit voltage of the auxiliary battery.
The DC / DC converter operates in a high output mode that converts the electric power of the vehicle drive battery into a relatively high power or a low output mode that converts the electric power of the vehicle drive battery into a relatively low power.
When the DC / DC converter is driven in the high output mode, the control unit shuts off the first switch, and after the lapse of the first predetermined time, the first opening of the auxiliary battery. Auxiliary battery controller, characterized by finding the circuit voltage. Auxiliary battery that supplies power to auxiliary equipment and
A voltage sensor that measures the voltage of the auxiliary battery and
The first switch connected in series to the auxiliary battery and
When the power conversion device that converts the power of the power supply unit that supplies the power for driving the axle into the power to be supplied to the auxiliary machine is being driven, the first switch is shut off and the first predetermined A control unit that obtains the first open circuit voltage of the auxiliary battery after a lapse of time, and
Equipped with
The power supply unit is a vehicle driving battery.
The power converter is a DC / DC converter.
When the DC / DC converter is being driven, the control unit shuts off the first switch, and after the lapse of the first predetermined time, obtains the first open circuit voltage of the auxiliary battery.
When the DC / DC converter is driven in a low output mode that converts the electric power of the vehicle driving battery into a relatively low power, the control unit changes from the low output mode to the vehicle driving battery. The output mode of the DC / DC converter is changed to a high output mode that converts electric power into relatively high power, the first switch is shut off, and after the lapse of the first predetermined time, the first of the auxiliary battery. An auxiliary battery control device, characterized in that the open circuit voltage of 1 is obtained. The auxiliary battery control device according to any one of claims 2 to 4 .
The resistance connected in parallel to the auxiliary battery and
Further equipped with a second switch connected in series with the resistor,
The control unit
After shutting off the first switch and obtaining the first open circuit voltage, the second switch is closed.
A current is passed from the auxiliary battery to the resistance for a second predetermined time to obtain a current integrated value.
After obtaining the current integrated value, the second switch is shut off.
After the lapse of the first predetermined time, the second open circuit voltage of the auxiliary battery is obtained.
Using the first charge rate estimated using the first open circuit voltage, the second charge rate estimated using the second open circuit voltage, and the current integrated value, An auxiliary battery control device, characterized in that the full charge capacity of the auxiliary battery is calculated.

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