JP6206292B2 - Power system - Google Patents

Description

  The present invention relates to a power supply system in which electric power generated by a generator is stored in a power storage device, and power is supplied from the power generator and the power storage device to a load.

  As a power supply system mounted on a vehicle, a power supply system including a generator that converts kinetic energy into regenerative power when decelerating, and a power storage device such as an electric double layer capacitor or a lithium ion battery that stores regenerative power generated by the generator Has been proposed (see, for example, Patent Document 1).

  In the power supply system described in Patent Document 1, the generator supplies the generated regenerative power to a load that is an in-vehicle device and a power storage device, and the power storage device supplies the stored power to the load.

JP 2012-240487 A

  In the power supply system described in Patent Document 1, when the output terminal of the power storage device is short-circuited, power is not supplied from the power storage device to the load. Furthermore, since a current related to the power generated by the generator flows toward the power storage device, there is a problem that the load is not supplied with power from both the generator and the power storage device.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a power supply system that can supply power to a load even when an output terminal of a power storage device is short-circuited. .

The power supply system according to the present invention is a power supply system in which electric power generated by a generator is stored in a power storage device, and power is supplied from the power generator and the power storage device to a load. A switch provided in a current path through which a discharge current from the power storage device to the load flows, a short-circuit determination unit that determines whether or not an output terminal of the power storage device is short-circuited, and the output by the short-circuit determination unit When it is determined that the end is short-circuited, an off means for turning off the switch , a power generation determination means for determining whether or not the generator is generating power, and the power generation determination means If the machine is determined to generate power, and a voltage detection means for time-sequentially and repeatedly detecting the output voltage of said power storage device, the shorting determination means, said voltage detecting means test Characterized in that the voltage is arranged to determine that the said output terminal if not increased with the lapse of time are short-circuited.

In the present invention, the electric power generated by the generator is supplied to the power storage device via the switch, and the charging current flows from the generator to the power storage device via the switch. The generator also supplies power to the load. The power storage device supplies power to the load, and a discharge current flows from the power storage device to the load via the switch. When it is determined that the output terminal of the power storage device is short-circuited, the above-described switch provided in the current path through which the charging current and the discharging current flow is turned off.
Thereby, since the electric current concerning the electric power generated by the generator does not flow toward the power storage device, the electric power generated by the generator is supplied to the load. Thus, even when the output terminal of the power storage device is short-circuited, the load is fed from the generator.

Further , when it is determined that the generator is generating electric power, the output voltage of the power storage device is repeatedly detected in time series. Then, when the output voltage of the power storage device detected a plurality of times does not increase with time, it is determined that the output terminal of the power storage device is short-circuited.
For this reason, it is determined without error whether or not the output terminal of the power storage device is short-circuited.

Power system according to the present invention, when the generator is determined not to generate power by the power determining means, and a second voltage detecting means for detecting an output voltage of said power storage device, wherein The short-circuit determining unit is configured to determine that the output terminal is short-circuited when the voltage detected by the second voltage detecting unit is less than a predetermined voltage.

In the present invention, when it is determined that the generator does not generate power, the output voltage of the power storage device is detected. When the detected output voltage of the power storage device is less than the predetermined voltage, it is determined that the output terminal of the power storage device is short-circuited.
Therefore, it can be determined with a simple configuration whether or not the output terminal of the power storage device is short-circuited.

The power supply system according to the present invention comprises direction detection means for detecting a direction of a current flowing through the current path when the power generation determination means determines that the generator does not generate power, and the short circuit The determination means is configured to determine that the output terminal is short-circuited when the direction detected by the direction detection means is a direction in which a current flows in the power storage device.

In the present invention, when it is determined that the generator does not generate power, the direction of the current flowing in the current path through which the charging current and the discharging current flow is detected. If the direction of the detected current is the direction in which current flows in the power storage device determines that the output end of the charge reservoir is shorted.
Therefore, it is accurately determined whether or not the output terminal of the power storage device is short-circuited.

  According to the present invention, power can be supplied to the load even when the output terminal of the power storage device is short-circuited.

1 is a block diagram illustrating a configuration of a main part of a power supply system according to Embodiment 1. FIG. It is a flowchart which shows the electricity supply control process which a control part performs. FIG. 10 is a block diagram illustrating a configuration of a main part of a power supply system according to a second embodiment. It is a flowchart which shows the electricity supply control process which a control part performs.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
(Embodiment 1)
FIG. 1 is a block diagram showing a main configuration of the power supply system according to the first embodiment. The power supply system 1 is suitably mounted on a vehicle and includes a generator 10, a first power storage device 11, a power supply control device 12, a second power storage device 13, loads 14 and 15, a starter 16, and a switch 17.

  One end of the generator 10 and the positive electrode of the first power storage device 11 are separately connected to the power supply control device 12, and the other end of the generator 10 and the negative electrode of the first power storage device 11 are grounded. The power supply control device 12 is further connected to one end and the other end of the switch 17 separately. One end of the switch 17 is further connected to the positive electrode of the second power storage device 13 and one end of each of the load 14 and the starter 16, and the other end of the switch 17 is further connected to one end of the load 15. The negative electrode of second power storage device 13 and the other ends of loads 14 and 15 and starter 16 are grounded.

  The generator 10 converts the kinetic energy of the vehicle into regenerative power, and further generates power in conjunction with an engine (not shown). The generator 10 generates AC power, rectifies the generated AC power into DC power, and outputs the DC voltage related to the rectified DC power to the power supply control device 12 as an output voltage. The generator 10 applies an output voltage to the first power storage device 11, the second power storage device 13, and the loads 14 and 15 via the power supply control device 12 and supplies power thereto.

Whether or not the generator 10 generates regenerative power is determined based on the amount of depression of an accelerator pedal and a brake pedal (not shown), at least one of the vehicle speeds, and the amount of power stored in the first power storage device 11. The For example, the generator 10 is in a state where the amount of power stored in the first power storage device 11 is less than a predetermined first power amount, the accelerator pedal is not depressed, the brake pedal is depressed, and the vehicle speed is reduced. When the generator 10 is operating, the generator 10 generates regenerative power.
The generator 10 generates power in conjunction with the engine when the amount of electricity stored in the first power storage device 11 is less than a predetermined second amount of power. The second power storage amount is a power storage amount smaller than the first power storage amount.

  The first power storage device 11 is an electric double layer capacitor or a lithium ion battery. The output voltage of the generator 10 is applied to the first power storage device 11 via the power supply control device 12, and thereby the electric power generated by the generator 10 is stored in the first power storage device 11. The first power storage device 11 supplies the stored power to the second power storage device 13 and the loads 14 and 15 via the power supply control device 12. The first power storage device 11 functions as a power storage device in the claims.

  The second power storage device 13 is, for example, a lead storage battery. The output voltage of the generator 10 or the first power storage device 11 is applied to the second power storage device 13 via the power supply control device 12, and the second power storage device 13 stores power. The second power storage device 13 supplies the stored power to the loads 14 and 15 and the starter 16 respectively. The second power storage device 13 supplies power to the load 15 via the switch 17.

  The load 14 is an in-vehicle device such as a power steering or ABS (Antilock Braking System), and consumes a relatively large amount of current in an operating state. The load 15 is an in-vehicle device such as a car navigation system, an audio device, a meter, or a lighting device, and the amount of current consumed in the operating state is small.

  The starter 16 is a motor for starting the engine. Just before the engine starts, the switch 17 is switched from on to off. In a state where the engine is stopped, power supply to the second power storage device 13, the load 14, and the starter 16 via the power supply control device 12 is stopped. For this reason, the starter 16 operates using the electric power stored in the second power storage device 13. The switch 17 is turned back on after a sufficient time has elapsed for the engine to start after being switched off. The switch 17 is switched off only during a period when the engine is started, and is normally kept on.

  The power supply control device 12 controls power supply from the generator 10 or the first power storage device 11 to the second power storage device 13 and the loads 14 and 15. The power supply control device 12 includes switches 21 and 22, a DC / DC converter 23, a voltage detection unit 24, a control unit 25, a current detection unit 26, a timer 27, and a storage unit 28.

  One end of the generator 10 is connected to one end of each of the switches 21 and 22 and the DC / DC converter 23. The other end of the switch 21 is connected to the positive electrode of the first power storage device 11 and the voltage detection unit 24. The other end of the switch 22 is connected to the positive electrode of the second power storage device 13 and one end of each of the load 14, the starter 16, and the switch 17. The DC / DC converter 23 is further connected to a connection node between the load 15 and the switch 17 and the control unit 25 separately. In addition to the DC / DC converter 23, the control unit 25 is connected to a voltage detection unit 24, a current detection unit 26, a timer 27, and a storage unit 28.

The switches 21 and 22 are semiconductor switches or relay contacts, and are turned on / off by the control unit 25.
The DC / DC converter 23 transforms the output voltage of the generator 10 or the first power storage device 11 to a preset target voltage. DC / DC converter 23 applies a target voltage to second power storage device 13 and loads 14 and 15 when switch 17 is on, and applies a target voltage to load 15 when switch 17 is off. Thereby, the 2nd electrical storage apparatus 13 stores the electric power supplied from the generator 10 or the 1st electrical storage apparatus 11, and load 14,15 is electrically fed.

  The output voltage of the generator 10 is higher than the output voltage of the first power storage device 11. For this reason, when the switch 21 is on, the DC / DC converter 23 transforms the output voltage of the generator 10 to the target voltage when the generator 10 is generating power, and the generator 10 is not generating power. At this time, the output voltage of the first power storage device 11 is transformed to the target voltage.

  The DC / DC converter 23 includes a coil (not shown) and one or a plurality of switches, and the one or a plurality of switches are turned on / off by the control unit 25 individually. The control unit 25 adjusts the on / off duty by causing the DC / DC converter 23 to perform voltage transformation by repeating on / off of one or a plurality of switches of the DC / DC converter 23 at a constant cycle. To adjust the step-up or step-down width. Furthermore, the control unit 25 stops the transformation of the DC / DC converter 23 by controlling on / off of one or a plurality of switches of the DC / DC converter 23.

The voltage detection unit 24 detects the output voltage of the first power storage device 11. The output voltage detected by the voltage detection unit 24 is read from the voltage detection unit 24 by the control unit 25.
The current detection unit 26 detects the value Idc of the current flowing through the DC / DC converter 23 and the value Isw of the current flowing through the switch 22. The two current values Idc and Isw detected by the current detection unit 26 are read from the current detection unit 26 by the control unit 25.

A start instruction for instructing the start of timing and an end instruction for instructing the end of timing are input from the control unit 25 to the timer 27. The timer 27 starts and ends timing in accordance with a start instruction and an end instruction input from the control unit 25. The time measured by the timer 27 is read from the timer 27 by the control unit 25.
The storage unit 28 stores various contents, and reading and writing of the contents from the storage unit 28 are performed by the control unit 25.

  Power generation information indicating whether the generator 10 is generating power is input to the control unit 25. The power generation information is, for example, information indicating the amount of depression of the accelerator pedal and the brake pedal, the vehicle speed, the amount of electricity stored in the first power storage device 11, and the on / off state of the ignition switch of the vehicle.

  For example, as described above, the control unit 25 is configured such that the accelerator pedal is not depressed, the brake pedal is depressed, and the power storage amount of the first power storage device 11 is less than the first power amount. When the vehicle speed is decelerating, it is determined that the generator 10 is generating regenerative power. Further, for example, when the amount of power stored in the first power storage device 11 is less than the second power amount and the ignition switch is on, the control unit 25 controls the generator 10 to charge the first power storage device 11. Is determined to be generating power in conjunction with the engine.

  The control unit 25 includes power generation information input from the outside, the output voltage of the first power storage device 11 detected by the voltage detection unit 24, the current detected by the current detection unit 26, the contents stored in the storage unit 28, and the like. Based on the above, the on / off of each of the switches 21 and 22 and the operation of the DC / DC converter 23 are controlled.

The control unit 25 causes the DC / DC converter 23 to perform transformation with the switch 22 turned off. As a result, the DC / DC converter 23 transforms the output voltage of the generator 10 or the output voltage of the first power storage device 11 applied via the switch 21 to the target voltage. When the switch 17 is on, the target voltage is applied to the second power storage device 13 and the loads 14 and 15, and when the switch 17 is off, the target voltage is applied to the load 15.
The target voltage is higher than the output voltage of the second power storage device 13. For this reason, when the switch 17 is on and the DC / DC converter 23 is transforming, the second power storage device 13 is charged with the target voltage applied.

  The control unit 25 repeatedly reads the current value Idc from the current detection unit 26 while causing the DC / DC converter 23 to perform transformation. While the read current value Idc is less than the predetermined threshold, the control unit 25 keeps the DC / DC converter 23 performing the transformation with the switch 22 turned off. When the current value Idc read from the current detection unit 26 is equal to or greater than the threshold value, the control unit 25 stops the transformation of the DC / DC converter 23 and turns off the switch 22 according to the operating state of the loads 14 and 15. Switch from to on. Thus, the second power storage device 13 and the loads 14 and 15 are directly fed from the generator 10 or the first power storage device 11 without passing through the DC / DC converter 23.

  The control unit 25 repeatedly reads the current value Isw from the current detection unit 26 while the switch 22 is turned on while the transformation of the DC / DC converter 23 is stopped. When the read current value Isw is equal to or greater than the threshold value, the control unit 25 maintains the switch 22 on in the state where the transformation of the DC / DC converter 23 is stopped. When the current value Isw read from the current detection unit 26 is less than the threshold value, the control unit 25 switches the switch 22 from on to off. Then, the control unit 25 causes the DC / DC converter 23 to perform transformation as described above.

  When the switch 22 is on, the switch 17 is on. This is because most of the electric devices mounted on the vehicle operate while the engine is operating, and when these operate, the current values Idc and Isw are each equal to or greater than the threshold value. When the switch 17 is off, most of the vehicle-mounted devices are stopped, and the current values Idc and Isw are each less than the threshold value.

  The switch 21 is provided in a current path through which a charging current from the generator 10 to the first power storage device 11 and a discharge current from the first power storage device 11 to the second power storage device 13 and the loads 14 and 15 flow. The control unit 25 performs the above-described control processing on the on / off of the switch 22 and the operation of the DC / DC converter 23, and also includes the power generation information input from the outside and the voltage detected by the voltage detection unit 24. The energization via the switch 21 is controlled based on the above.

  FIG. 2 is a flowchart showing energization control processing executed by the control unit 25. The control unit 25 turns on the switch 21 when the ignition switch is turned on from off, and executes the energization control process in a state where the switch 21 is on.

First, the control unit 25 determines whether or not the first power storage device 11 is charged based on power generation information input from the outside (step S1). The control unit 25 determines that the first power storage device 11 is charged when the power generation information input from the outside indicates the power generation of the generator 10. The control unit 25 determines that the first power storage device 11 is not charged when the power generation information input from the outside does not indicate the power generation of the generator 10 .

The first power storage device 11 is discharged when the first power storage device 11 is not charged, and the first power storage device 11 is not discharged when the first power storage device 11 is charged. For this reason, step S1 corresponds to the control unit 25 determining whether or not the first power storage device 11 is discharged .

  When it is determined that the first power storage device 11 is charged (S1: YES), the controller 25 outputs a start instruction to the timer 27 to cause the timer 27 to start measuring time (step S2). And the control part 25 reads the output voltage of the 1st electrical storage apparatus 11 from the voltage detection part 24 (step S3), and memorize | stores the read output voltage in the memory | storage part 28 (step S4).

After executing step S4, the control unit 25 determines whether or not the time measured by the timer 27 is equal to or longer than a preset time (step S5). When it is determined that the timed time is less than the set time (S5: NO), the control unit 25 returns the process to step S3, and repeats the output voltage of the first power storage device 11 until the timed time becomes equal to or longer than the set time. Read and store the output voltage in the storage unit 28. While the control unit 25 determines that the first power storage device 11 is charged and steps S3 and S4 are repeatedly executed, the voltage detection unit 24 detects the output voltage of the first power storage device 11 in time series. doing. The voltage detection unit 24 functions as voltage detection means. The voltage detection unit 24 detects the output voltage of the first power storage device 11 at least once during one cycle in which steps S3 and S4 are executed.
The control unit 25 executes steps S3 and S4 at least twice until the timer 27 starts measuring time until the timed time becomes equal to or longer than the set time.

  When it is determined that the measured time is equal to or longer than the set time (S5: YES), the control unit 25 outputs an end instruction to the timer 27, thereby causing the timer 27 to finish measuring (step S6). Next, the control part 25 determines whether the output terminal of the 1st electrical storage apparatus 11 is short-circuited based on the output voltage memorize | stored in the memory | storage part 28 by repeating step S4 (step S7). When the output voltage of the first power storage device 11 repeatedly read in step S3 by the time measured time reaches or exceeds the set time, the control unit 25 shorts the output terminal of the first power storage device 11. Judge that it is not. For example, when at least one of the output voltages read after the second time exceeds the output voltage read at the first time, the control unit 25 causes the output voltage of the first power storage device 11 to increase with time. Judge that it has risen.

In addition, when the output voltage of the first power storage device 11 that is repeatedly read in step S3 until the time count becomes equal to or longer than the set time does not increase with the passage of time, the control unit 25 outputs the first power storage device 11. It is determined that the end is short-circuited. For example, when all of the output voltages read after the second time are equal to or lower than the output voltage read for the first time, the control unit 25 determines that the output voltage of the first power storage device 11 has not increased over time. to decide. The control unit 25 also functions as a short circuit determination unit.
Control unit 25 determines without error whether or not the output terminal of first power storage device 11 is short-circuited by determining whether or not the output voltage of first power storage device 11 has increased with time. be able to.

  When it is determined that the output terminal of the first power storage device 11 is short-circuited (S7: YES), the control unit 25 turns off the switch 21 (step S8). As a result, the current related to the power generated by the generator 10 does not flow toward the first power storage device 11, and the power generated by the power generator 10 is supplied to the second power storage device 13 and the loads 14 and 15. Therefore, even when the output terminal of the first power storage device 11 is short-circuited, the second power storage device 13 and the loads 14 and 15 are supplied with power from the generator 10. The control unit 25 also functions as an off means.

  Note that after the control unit 25 executes step S8, the switch 17 is kept on regardless of whether the starter 16 operates, and the generator 10 is independent of the amount of power stored in the first power storage device 11, for example. Regenerative power is generated, and power is generated in conjunction with the engine when the second power storage device 13 becomes less than a predetermined amount of power.

  After executing Step S8, the controller 25 ends the energization control process. In this case, the control unit 25 keeps the switch 21 off and does not execute the energization control process until the ignition switch is turned off and then turned on again.

  When it is determined that the output terminal of the first power storage device 11 is not short-circuited (S7: NO), the control unit 25 ends the energization control process. Thereafter, the control unit 25 repeats the energization control process.

  When it is determined that the first power storage device 11 is not charged, that is, when it is determined that the first power storage device 11 is discharged (S1: NO), the control unit 25 performs the first power storage from the voltage detection unit 24. The output voltage of the device 11 is read (step S9). The voltage detection unit 24 detects the output voltage of the first power storage device 11 when the control unit 25 executes step S9, and also functions as a second voltage detection unit.

Next, the control part 25 determines whether the output terminal of the 1st electrical storage apparatus 11 is short-circuited based on the output voltage read by step S9 (step S10). Control unit 25 determines that the output terminal of first power storage device 11 is short-circuited when the output voltage read in step S9 is less than a preset voltage. Control unit 25 determines that the output terminal of first power storage device 11 is not short-circuited when the output voltage read in step S9 is equal to or higher than the set voltage.
Thus, the control unit 25 can determine whether or not the output terminal of the first power storage device 11 is short-circuited based on the output voltage of the first power storage device 11 with a simple configuration.

  When it is determined that the output terminal of the first power storage device 11 is short-circuited (S10: YES), the control unit 25 turns off the switch 21 (step S11). Thus, even when the output terminal of the first power storage device 11 is short-circuited, the second power storage device 13 and the loads 14 and 15 are supplied with power from the generator 10.

  In addition, after the control part 25 performs step S11, the process similar to after performing step S8 is performed. That is, the control unit 25 keeps the switch 21 off and does not execute the energization control process until the ignition switch is once turned off and then turned on again. In addition, after the control unit 25 executes step S11, the switch 17 is kept on regardless of whether the starter 16 operates or not, and the generator 10 operates in the same manner as when the control unit 25 executes step S8. I do.

  When it is determined that the output terminal of the first power storage device 11 is not short-circuited (S10: NO), the control unit 25 ends the energization control process. Thereafter, the control unit 25 repeats the energization control process.

(Embodiment 2)
FIG. 3 is a block diagram showing a main configuration of the power supply system according to the second embodiment. This power supply system 3 is different from the power supply system 1 of the first embodiment in that a short circuit is determined not by voltage but by current.
In the following, the differences between the second embodiment and the first embodiment will be described. Since the other configuration except the configuration to be described later is the same as that of the first embodiment, the same reference numerals are given and the description thereof is omitted.

  Power supply system 3 is suitably mounted on a vehicle, and similarly to power supply system 1 in the first embodiment, generator 10, first power storage device 11, second power storage device 13, loads 14 and 15, starter 16 and timer 27. Is provided. The power supply system 3 further includes switches 30 and 31, a differential amplifier 32, a control unit 33, and a resistor R1.

  One end of the generator 10 is connected to the positive electrode of the second power storage device 13 and one end of each of the load 14, the starter 16, and the switch 30. The other end of each of the generator 10, the load 14, and the starter 16 and the negative electrode of the second power storage device 13 are grounded. The other end of the switch 30 is connected to one end of each of the load 15 and the resistor R 1, and the other end of the resistor R 1 is connected to one end of the switch 31. The other end of the switch 31 is connected to the positive electrode of the first power storage device 11. The negative electrode of the first power storage device 11 and the other end of the load 15 are grounded.

  One end and the other end of the resistor R1 are connected to the plus terminal and the minus terminal of the differential amplifier 32, respectively. The output terminal of the differential amplifier 32 is connected to the control unit 33. The control unit 33 is further connected to the timer 27.

  The generator 10 generates power in the same manner as in the first embodiment. The generator 10 applies the output voltage to the first power storage device 11 and the load 15 via the switch 30. The generator 10 further applies the second power storage device 13 and the load 14. Thereby, the 1st electrical storage apparatus 11, the 2nd electrical storage apparatus 13, and load 14,15 are electrically fed.

  The first power storage device 11 stores the power generated by the generator 10 as in the first embodiment. The first power storage device 11 supplies the stored power to the load 15 via the switch 31 and the resistor R1. Further, the first power storage device 11 supplies the stored power to the load 14 via the switch 31, the resistor R <b> 1, and the switch 30. The first power storage device 11 also functions as the power storage device in the claims in the second embodiment.

  The second power storage device 13 is powered by the generator 10. The second power storage device 13 supplies the stored power to the load 15 via the switch 30. The second power storage device 13 further supplies the stored power to the load 14 and the starter 16.

  The output voltage of the generator 10 is higher than any of the output voltages of the first power storage device 11 and the second power storage device 13. For this reason, when each of the switches 30 and 31 is on, when the generator 10 is generating power, the electric power generated by the generator 10 is supplied to the first power storage device 11, the second power storage device 13, and the loads 14 and 15. Supplied.

  Switch 30 is turned on / off in the same manner as switch 17 in the first embodiment. That is, the switch 30 is switched from on to off immediately before the engine is started. The generator 10 is not generating power when the engine is stopped. For this reason, the starter 16 operates using the electric power stored in the second power storage device 13. The switch 30 is turned back on after a sufficient time has elapsed for the engine to start after being switched off. The switch 30 is switched off only during the period in which the starter 16 operates, and is normally kept on.

The switch 31 is turned on / off by the control unit 33.
The timer 27 is configured in the same manner as in the first embodiment, and a start instruction and an end instruction are input from the control unit 33 to the timer 27. The timer 27 discloses and ends time measurement in accordance with a start instruction and an end instruction input from the control unit 33. The time measured by the timer 27 is read from the timer 27 by the control unit 33.

  The differential amplifier 32 outputs a voltage obtained by amplifying a voltage obtained by subtracting the voltage input to the minus terminal from the voltage input to the plus terminal. The differential amplifier 32 has an output terminal when the voltage input to the positive terminal is higher than the voltage input to the negative terminal, that is, when current flows from the switch 30 side to the first power storage device 11 side. To output a positive voltage to the control unit 33. The absolute value of the positive voltage is larger as the voltage across the resistor R1 is higher. The differential amplifier 32 has an output terminal when the voltage input to the plus terminal is lower than the voltage input to the minus terminal, that is, when current is flowing from the first power storage device 11 side to the switch 30 side. To output a negative voltage to the control unit 33. The absolute value of the negative voltage is larger as the voltage across the resistor R1 is higher.

The resistor R1 and the switch 31 are provided in a current path through which a charging current from the generator 10 to the first power storage device 11 and a discharge current from the first power storage device 11 to the loads 14 and 15 flow.
Accordingly, the differential amplifier 32 configured as described above detects the direction of the current flowing through the resistor R1, that is, the direction of the current flowing through the current path.

  The voltage applied across the resistor R1 is high / low depending on the magnitude of the current flowing through the resistor R1, and is a value related to the charging current when the charging current is flowing through the resistor R1, When a discharge current flows through the resistor R1, the value is related to the discharge current. Therefore, the differential amplifier 32 configured as described above detects the voltage across the resistor R1, that is, the value related to the charging current or the discharging current, and supplies the voltage corresponding to the detected voltage from the output terminal to the control unit. To 33.

  On / off information indicating whether the switch 30 is on or off, and power generation information indicating whether the generator 10 is generating power are input to the control unit 33. The control unit 33 determines whether or not the switch 30 is on based on the on / off information. The power generation information is the same information as in the first embodiment. The control unit 33 controls energization via the switch 31 based on on / off information and power generation information input from the outside, an output voltage output from the output terminal of the differential amplifier 32, and the like.

  FIG. 4 is a flowchart showing energization control processing executed by the control unit 33. The control unit 33 turns on the switch 31 when the ignition switch is turned on from off. The control unit 33 executes the energization control process with the switches 30 and 31 being on.

First, the control unit 33 determines whether or not the first power storage device 11 is charged based on power generation information input from the outside (step S21). When the power generation information input from the outside indicates the power generation of the generator 10, the control unit 33 determines that the first power storage device 11 is charged, and the power generation information does not indicate the power generation of the generator 10. It is determined that the first power storage device 11 is not charged .

When the first power storage device 11 is not charged, the first power storage device 11 is discharged, and when the first power storage device 11 is charged, the first power storage device 11 is not discharged. For this reason, step S21 corresponds to the control unit 33 determining whether or not the first power storage device 11 is discharged .

When it is determined that the first power storage device 11 is charged (S21: YES), the controller 33 reads the output voltage of the differential amplifier 32 (step S22). The differential amplifier 32 detects a value related to the charging current when the control unit 33 determines in step S21 that the first power storage device 11 is charged .

  Next, the control part 33 determines whether the output terminal of the 1st electrical storage apparatus 11 is short-circuited based on the absolute value of the output voltage read by step S22 (step S23).

When the absolute value of the output voltage read in step S22 is equal to or greater than a preset value, that is, the control unit 33 indicates that the charging current is equal to or greater than a predetermined current, the output voltage of the differential amplifier 32 is When it shows, it determines with the output terminal of the 1st electrical storage apparatus 11 being short-circuited. When the absolute value of the output voltage read in step S22 is less than the set value, that is, when the output voltage of the differential amplifier 32 indicates that the charging current is less than the predetermined current, the control unit 33 It is determined that the output terminal of one power storage device 11 is not short-circuited. The controller 33 also functions as a short circuit determination unit.
As described above, the control unit 33 can determine whether the output terminal of the first power storage device 11 is short-circuited with a simple configuration based on the output voltage of the differential amplifier 32.

  When it is determined that the output terminal of the first power storage device 11 is short-circuited (S23: YES), the control unit 33 turns off the switch 31 (step S24). Thereby, the current related to the power generated by the generator 10 and the current related to the power stored in the second power storage device 13 do not flow toward the first power storage device 11, and the power generated by the generator 10 is The power stored in the second power storage device 13 and the loads 14 and 15 is supplied to the loads 14 and 15 and the starter 16. Accordingly, even when the output terminal of the first power storage device 11 is short-circuited, the second power storage device 13 and the loads 14 and 15 are supplied with power by the generator 10, and the loads 14 and 15 are also supplied with power from the second power storage device 13. Is done. The control unit 33 also functions as an off means in the second embodiment.

  Note that after the control unit 33 executes step S24, the switch 30 is kept on regardless of whether the starter 16 operates, and the generator 10 is independent of the amount of power stored in the first power storage device 11, for example. Regenerative power is generated, and power is generated in conjunction with the engine when the second power storage device 13 becomes less than a predetermined amount of power.

  After executing step S24, the control unit 33 ends the energization control process. In this case, the control unit 33 keeps the switch 31 off and does not execute the energization control process until the ignition switch is turned off and then turned on again.

  When it is determined that the output terminal of the first power storage device 11 is not short-circuited (S23: NO), the control unit 33 ends the energization control process. Thereafter, unless the switch 30 is turned off, the control unit 33 repeats the energization control process.

  When it is determined that the first power storage device 11 is not charged, that is, when it is determined that the first power storage device 11 is discharged (S21: NO), the control unit 33 outputs a start instruction to the timer 27. This causes the timer 27 to start measuring time (step S25).

  Next, the control unit 33 determines whether or not the time measured by the timer 27 is equal to or longer than the reference time (step S26). Here, the reference time is the first power storage device 11 and the second power storage since the generator 10 stops power generation or the switch 30 is switched from OFF to ON in the power supply system 3 operating normally. The time is sufficiently set so that the output voltages of the devices 13 are substantially the same.

  When the measured time is less than the reference time (S26: NO), the control unit 33 returns the process to step S26 and waits until the measured time becomes equal to or greater than the reference time. When it is determined that the measured time is equal to or longer than the reference time (S26: YES), the control unit 33 outputs a termination instruction to the timer 27 to cause the timer 27 to terminate timing (step S27).

  Next, the output voltage of the differential amplifier 32 is read (step S28). The differential amplifier 32 detects the direction of the current flowing through the resistor R1 when the control unit 33 determines in step S21 that the first power storage device 11 is discharged, and also functions as a direction detection unit.

  Next, the control unit 33 determines whether or not the output terminal of the first power storage device 11 is short-circuited based on whether the output voltage read in step S28 is positive or negative (step S29). ). When the first power storage device 11 is normally discharged, the current flows from the first power storage device 11 side to the switch 30 side in the resistor R1, and the differential amplifier 32 controls the negative output voltage from the output terminal to the control unit. To 33. If the output voltage read in step S25 is negative, control unit 33 determines that the output terminal of first power storage device 11 is not short-circuited. In addition, the control unit 33 is configured such that the differential amplifier 32 outputs a positive output voltage from the output terminal, that is, the direction of the current detected by the differential amplifier 32 is the direction in which the first power storage device 11 flows. It is determined that the output terminal of the first power storage device 11 is short-circuited. Control unit 33 can accurately determine whether or not the output terminal of first power storage device 11 is short-circuited based on the direction of the current flowing through resistor R1 as described above.

  When it is determined that the output terminal of the first power storage device 11 is short-circuited (S29: YES), the control unit 33 turns off the switch 31 (step S30). Thus, even when the output terminal of the first power storage device 11 is short-circuited, the second power storage device 13 and the loads 14 and 15 are supplied with power by the generator 10, and the loads 14 and 15 are also supplied from the second power storage device 13. Power is supplied.

  In addition, after the control part 33 performs step S30, the process similar to after performing step S24 is performed. That is, the control unit 33 keeps the switch 21 off and does not execute the energization control process until the ignition switch is turned off and then turned on again. In addition, after the control unit 33 executes step S30, the switch 30 is kept on regardless of whether the starter 16 operates or not, and the generator 10 operates in the same manner as when the control unit 33 executes step S24. I do.

  When it is determined that the output terminal of the first power storage device 11 is not short-circuited (S29: NO), the control unit 33 ends the energization control process. Thereafter, the control unit 33 repeats the energization control process.

  In the second embodiment, the value relating to the charging current is not limited to the voltage across the resistor R1, and may be, for example, a charging current value. In this case, for example, an ammeter is provided instead of the resistor R1 and the differential amplifier 32. When it is determined that the first power storage device 11 is charged, the control unit 33 determines that the output terminal of the first power storage device 11 is short-circuited when the value measured by the ammeter is equal to or greater than a predetermined current value. When the value measured by the ammeter is less than the predetermined current, it is determined that the output terminal of the first power storage device 11 is not short-circuited.

  Furthermore, the configuration for detecting the direction in which the current flows is not limited to the configuration using the resistor R1 and the differential amplifier 32. For example, the current probe has an annular portion through which the conducting wire is inserted and detects the current flowing through the conducting wire. A configuration using may be used.

  In addition, you may combine the structure of Embodiment 1 and 2 about the structure which determines whether the output terminal of the 1st electrical storage apparatus 11 is short-circuited. In the power supply system 3 according to the second embodiment, for example, when the first power storage device 11 is charged, the output voltage of the first power storage device 11 is detected in time series, and the output voltage increases with time. Whether or not the output terminal of the first power storage device 11 is short-circuited may be determined based on whether or not Further, in the power supply system 3, for example, when the first power storage device 11 is discharged, the output voltage of the first power storage device 11 is detected, and the first voltage is determined based on whether the detected voltage is less than the set voltage. It may be determined whether or not the output terminal of one power storage device 11 is short-circuited.

  Further, in the first and second embodiments, when the configuration is such that the output voltage of first power storage device 11 does not normally become lower than a certain voltage, first power storage device 11 is charged while first power storage device 11 is charged. 11 may be determined that the output terminal of the first power storage device 11 is short-circuited when the output voltage of 11 is less than a predetermined voltage lower than the predetermined voltage. In this configuration, when the output voltage of the first power storage device 11 is equal to or higher than a predetermined voltage, it is determined that the output terminal of the first power storage device 11 is not short-circuited.

  The disclosed embodiments 1 and 2 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.

DESCRIPTION OF SYMBOLS 1,3 Power supply system 10 Generator 11 1st electrical storage apparatus 14,15 Load 21,31 Switch 24 Voltage detection part (Voltage detection means, 2nd voltage detection means)
25, 33 control section (short-circuit determination means, off-hand stage)
32 differential amplifier (rectangular direction detecting means)

Claims (3)

In the power supply system in which the electric power generated by the generator is stored in the power storage device and is fed to the load from the power generator and the power storage device,
A switch provided in a current path through which a charging current from the generator to the power storage device and a discharge current from the power storage device to the load flow;
Short-circuit determining means for determining whether or not the output terminal of the power storage device is short-circuited;
An off means for turning off the switch when the short-circuit judging means determines that the output terminal is short-circuited ;
Power generation determination means for determining whether or not the generator generates power;
Voltage detection means for repeatedly detecting the output voltage of the power storage device in time series when the power generation determination means determines that the generator is generating power ,
The power supply system according to claim 1, wherein the short-circuit determining unit is configured to determine that the output terminal is short-circuited when the voltage detected by the voltage detecting unit does not increase with time . When the generator is determined not to generate power by the power determining means, and a second voltage detecting means for detecting an output voltage of said power storage device,
The short determination means according to claim 1, voltage second voltage detecting means has detected is equal to or that is configured to determine that the output terminal when it is less than the predetermined voltage is shorted Power supply system as described in. Direction detection means for detecting the direction of the current flowing in the current path when the power generation determination means determines that the generator does not generate power , and
The short circuit determination unit is configured to determine that the output terminal is short-circuited when the direction detected by the direction detection unit is a direction in which a current flows in the power storage device. The power supply system according to claim 1 .

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