JP2017061217A - Charging equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide charging equipment capable of suppressing the occurrence of flat battery in a battery for accessories even when there is abnormality in switching means of charging of the battery for the accessories.SOLUTION: There is provided charging equipment 1 for charging a battery 9 for accessories and mounted on a vehicle comprising an electric motor 3. The charging equipment 1 comprises a battery 7 for the electric motor, first charging means 11 for charging the battery 9 for the accessories by stepping-down the battery 7 for the electric motor, second charging means 12 for charging the battery 9 for the accessories, switching means 24 for switching the first charging means 11 and the second charging means 12, power storage amount detection means for detecting a power storage amount of the battery 7 for the electric motor, abnormality detection means for detecting abnormality of the switching means 24, and control means 27 for switching to the second charging means 12 from the first charging means 11 by controlling the switching means 24 when the power storage amount of the battery 7 for the electric motor reduces down to a permitted power storage amount. When there is abnormality in the switching means 24, the control means 27 causes the first charging means 11 to perform charging up to the power storage amount lower than the permitted power storage amount.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a charging device that charges an auxiliary battery mounted on a vehicle including an electric motor as a power source.

  The vehicle includes an auxiliary battery that supplies electric power to the auxiliary machine, and includes charging means for charging the auxiliary battery. In particular, in the case of a vehicle including an electric motor as a power source, some vehicles include a charging unit that steps down the voltage of a high-voltage battery that supplies electric power to the electric motor and charges the auxiliary battery. When a plurality of charging means are provided as described above, the charging means are switched based on a predetermined condition. For example, in Patent Document 1, when the storage amount of one battery falls below a predetermined reference value, the system maintenance can be guaranteed even if the storage amount of the other battery is charged to one battery. A multiple battery system that performs inter-battery charging from the other battery to one battery is disclosed.

JP 2003-70172 A

  In a vehicle including a plurality of charging means, a switching means is provided to switch the charging means. When this switching means is abnormal, the charging means cannot be switched by the switching means. In this case, since it becomes impossible to charge the battery for auxiliary machines, there exists a possibility that the battery for auxiliary machines will rise and cannot supply electric power to an auxiliary machine. Patent Document 1 does not disclose how to deal with such an abnormality in the switching means.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a charging device that can suppress the auxiliary battery from rising even when the auxiliary battery charging switching means is abnormal. To do.

  A charging device according to the present invention is a charging device for charging an auxiliary battery mounted on a vehicle including an electric motor as a power source, the electric motor battery supplying electric power to the electric motor, and the electric motor battery A first charging means for stepping down the voltage of the auxiliary battery and charging the auxiliary battery, a second charging means for charging the auxiliary battery by a method different from the first charging means, a first charging means and a second charging means, Switching means for switching, storage amount detection means for detecting the storage amount of the electric motor battery, abnormality detection means for detecting abnormality of the switching means, and the storage amount detected by the storage amount detection means has decreased to the permitted storage amount Control means for performing switching control for switching the switching means from the first charging means to the second charging means, and the control means includes a battery for the electric motor when the abnormality detecting means detects an abnormality. Charged amount is characterized in that to perform charging in the first charging means until drops lower abnormal allowed storage quantity than permitted amount of charge.

  According to the charging device of the present invention, when the switching unit is normal, the electric motor is switched by the switching unit from the first charging unit to the second charging unit when the storage amount of the electric motor battery decreases to the permitted storage amount. Power consumption of the battery can be reduced. Thereby, electric power can be stably supplied from the battery for electric motors to the electric motor. Further, according to the charging device of the present invention, when the switching unit is abnormal, the first charging unit is charged up to a storage amount lower than the permitted storage amount, thereby lowering the switching unit than normal. The auxiliary battery can be charged using the electric motor battery up to the charged amount. Thereby, according to the charging device which concerns on this invention, even when there exists abnormality in a switching means, the battery rise for auxiliary machines can be suppressed.

  The charging device according to the present invention may include a generator and a generator battery charged by the generator, and the second charging unit may charge the auxiliary battery from the generator battery charged by the generator. . By comprising in this way, a 2nd charging means can be comprised using the generator mounted in the vehicle, and the battery for auxiliary machines can be charged.

  The charging device according to the present invention includes first voltage detection means for detecting the voltage of the generator battery and second voltage detection means for detecting the voltage of the auxiliary battery, and the abnormality detection means performs switching control. It is good also as a structure which detects abnormality by comparing the voltage which the 1st voltage detection means detected after the start with the voltage which the 2nd voltage detection means detected. With this configuration, it is possible to easily detect an abnormality in the switching means simply by comparing the voltages of the two batteries.

  The charging device according to the present invention preferably includes an engine as a power source, and the generator is a generator that also serves as a starter of the engine. If it does in this way, the 2nd charge means can be constituted using the generator which serves as a starter of an engine.

  In the charging device according to the present invention, it is preferable that the driving force by the electric motor is limited when the abnormality detection unit detects an abnormality. In this way, when the switching means is abnormal, the electric motor used for charging the auxiliary battery to a lower storage amount than when the switching means is normal by limiting the driving force by the electric motor. Power consumption of the battery can be suppressed.

  In the charging device according to the present invention, it is preferable to provide information relating to the abnormality to the vehicle occupant when the abnormality detection means detects the abnormality. In this way, by notifying the vehicle occupant of the abnormality, the occupant (especially the driver) can be urged to suppress the power consumption of the electric motor battery.

  ADVANTAGE OF THE INVENTION According to this invention, even when there exists abnormality in the switching means of charge of an auxiliary battery, an auxiliary battery rise can be suppressed.

It is a block diagram which shows the structure of the charging device which concerns on embodiment. It is a flowchart which shows the flow of operation | movement of the charging device which concerns on embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals are used for the same or corresponding parts. Moreover, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

  With reference to FIG. 1, the charging device 1 which concerns on embodiment is demonstrated. FIG. 1 is a block diagram illustrating a configuration of a charging device 1 according to the embodiment. In this embodiment, a case where the present invention is applied to a one-motor hybrid vehicle (HEV (Hybrid Electric Vehicle)) will be described as an example of a vehicle on which the charging device 1 is mounted.

  A hybrid vehicle equipped with the charging device 1 includes an engine 2 and an electric motor 3 as power sources. The engine 2 may be of any type, but is, for example, a horizontally opposed four-cylinder gasoline engine. The electric motor 3 functions as an electric motor, and is, for example, a three-phase AC type AC synchronous motor. The electric motor 3 is a motor generator that also functions as a generator.

  The charging device 1 includes, as an electrical system, an ISG (Integrated Start Generator) 4 (corresponding to the generator described in the claims), an ISG battery 5 (corresponding to the generator battery described in the claims), and Inverter 6, high-voltage battery 7 (corresponding to the battery for an electric motor described in the claims), DC-DC converter 8, and auxiliary battery 9 (for the auxiliary battery described in the claims) Equivalent).

  The ISG 4 is a starter that starts the engine 2 and functions as an electric motor. The ISG 4 functions as a generator that converts the rotational energy of the engine 2 as electric energy. The converted electrical energy is stored in the ISG battery 5. The ISG 4 is controlled by an engine ECU (Electronic Control Unit) (not shown). The ISG 4 may be a DC motor or an AC motor. When the ISG 4 is an AC motor, for example, when the ISG 4 functions as an electric motor, the DC power of the ISG battery 5 is converted into AC power, and when the ISG 4 functions as a generator, the AC power generated by the ISG 4 is converted into DC power. An ISG inverter for conversion is also provided, and this ISG inverter is controlled by the engine ECU.

  The ISG battery 5 is a battery that supplies power to the ISG 4. The ISG battery 5 is a battery that stores electrical energy generated by the ISG 4. The battery 5 for ISG is a 12V battery. The ISG battery 5 is, for example, a lead battery.

  The inverter 6 converts the DC power of the high voltage battery 7 into AC power and supplies the AC power to the electric motor 3. The inverter 6 converts AC power generated by the electric motor 3 into DC power. The converted electric energy is stored in the high voltage battery 7. The inverter 6 is controlled by a motor ECU 26 described later.

  The high voltage battery 7 is a battery that supplies electric power to the electric motor 3. The high voltage battery 7 is a battery that stores electrical energy generated by the electric motor 3. The high voltage battery 7 is a battery having a higher voltage than the battery 5 for ISG and the battery 9 for auxiliary machines, and is a battery of several hundred volts, for example. The high voltage battery 7 is, for example, a lithium ion battery or a nickel metal hydride battery.

  The DC-DC converter 8 steps down the DC high voltage of the high voltage battery 7. The stepped-down electrical energy is stored in the auxiliary battery 9. The DC-DC converter 8 is controlled by the HEV-ECU 27 described later.

  The auxiliary battery 9 is a battery that supplies electric power to an auxiliary machine mounted on the hybrid vehicle. The auxiliary battery 9 is a 12V battery. The auxiliary battery 9 is, for example, a lead battery. The auxiliary battery 9 is charged by switching the following two charging means 11 and 12 under a predetermined condition.

  The auxiliary battery 9 is charged by being supplied with electric energy obtained by stepping down the high voltage of the high voltage battery 7 by the DC-DC converter 8. The high voltage battery 7 and the DC-DC converter 8 constitute a first charging unit 11. The auxiliary battery 9 is charged by being electrically connected to the ISG battery 5 that stores the electric energy generated by the ISG 4. However, when the voltage of the auxiliary battery 9 is higher than that of the ISG battery 5, the ISG battery 5 is charged by the auxiliary battery 9. The ISG 4 and the ISG battery 5 constitute the second charging means 12. If the ISG 4 is an AC motor, the second charging means 12 includes an ISG inverter.

  The charging device 1 includes, as control systems, a voltage sensor 20 (corresponding to first voltage detection means described in claims) and a voltage sensor 21 (corresponding to second voltage detection means described in claims). , Voltage sensor 22, current sensor 23, switching relay 24 (corresponding to switching means described in claims), display device 25, motor ECU 26, and HEV-ECU 27 (control described in claims) And a BCU (Battery Control Unit) 28. Note that the ECUs 26 and 27 and the BCU 28 are connected to each other so as to be able to communicate with each other via, for example, a CAN (Controller Area Network) (not shown).

  The voltage sensor 20 is a sensor that detects the voltage of the battery 5 for ISG. The voltage sensor 20 is connected to the HEV-ECU 27, and outputs the detected voltage of the ISG battery 5 to the HEV-ECU 27.

  The voltage sensor 21 is a sensor that detects the voltage of the auxiliary battery 9. The voltage sensor 21 is connected to the HEV-ECU 27 and outputs the detected voltage of the auxiliary battery 9 to the HEV-ECU 27.

  The voltage sensor 22 is a sensor that detects the voltage of the high-voltage battery 7. The voltage sensor 22 is connected to the BCU 28 and outputs the detected voltage of the high voltage battery 7 to the BCU 28. The current sensor 23 is a sensor that detects the current of the high-voltage battery 7. The current sensor 23 is connected to the BCU 28 and outputs the detected current of the high voltage battery 7 to the BCU 28. In addition, the SOC (State Of Charge) (charged amount) of the high voltage battery 7 is derived using the voltage and current of the high voltage battery 7, and this SOC is used in the HEV-ECU 27. The derivation of the SOC may be performed by the BCU 28 or may be performed by the HEV-ECU 27. When the SOC is derived by the BCU 28, the SOC of the high voltage battery 7 is output from the BCU 28 to the HEV-ECU 27. When the SOC is derived by the HEV-ECU 27, the voltage and current of the high voltage battery 7 are BCU Is output to HEV-ECU 27. Therefore, in this embodiment, the voltage sensor 22, the current sensor 23, and the BCU 28 or HEV-ECU 27 constitute the storage amount detection means described in the claims.

  The switching relay 24 is a relay that switches between the first charging unit 11 and the second charging unit 12 for charging the auxiliary battery 9. The switching relay 24 is a DC 12V specification relay. The switching relay 24 is, for example, an electromagnetic relay. The switching relay 24 is provided on a positive connection line 24a that connects the positive terminal of the ISG battery 5 and the positive terminal of the auxiliary battery 9, and connects / disconnects the connection line 24a. The minus terminal of the ISG battery 5 and the minus terminal of the auxiliary battery 9 are connected by a minus side connection line. Opening and closing of the switching relay 24 is controlled by the HEV-ECU 27.

  For example, in the case of normally open, the switching relay 24 closes when the HEV-ECU 27 energizes the coil of the electromagnetic relay, and opens when it is not energized. When the switching relay 24 is closed, the ISG battery 5 and the auxiliary battery 9 are electrically connected. As a result, when the voltage of the ISG battery 5 is higher than the voltage of the auxiliary battery 9, the auxiliary battery 9 is charged from the ISG battery 5 (charging by the second charging means 12), and the auxiliary battery is charged. When the voltage 9 is higher than the voltage of the ISG battery 5, the ISG battery 5 is charged from the auxiliary battery 9. And the voltage of the battery 5 for IGS and the voltage of the battery 9 for auxiliary machines become substantially the same voltage. When the switching relay 24 is opened, the ISG battery 5 and the auxiliary battery 9 are electrically disconnected. When the switching relay 24 is open, charging by the first charging means 11 is performed.

  When the switching relay 24 is abnormal (for example, when the switching relay 24 is not closed despite being energized from the HEV-ECU 27), the ISG battery 5 and the auxiliary battery 9 are electrically connected. Since the connection cannot be made, the second charging means 12 cannot be charged. In this case, if the electric power stored in the auxiliary battery 9 continues to be consumed by the auxiliary machine, the auxiliary battery 9 may rise, and the auxiliary machine may not be supplied with electric power. In this case, since the ISG battery 5 and the auxiliary battery 9 are not electrically connected, the voltage of the IGS battery 5 and the voltage of the auxiliary battery 9 do not become substantially the same voltage. If there is an abnormality in the switching relay 24, the operation shifts to retreat travel that travels only by the driving force of the electric motor 3 as fail safe.

  The display device 25 is a device that displays various types of information. The display device 25 is, for example, a display device provided in a combination meter or a display device for car navigation. In particular, when the display device 25 receives a display signal from the HEV-ECU 27, the display device 25 displays an image indicated by the display signal. If there is a separate control unit for controlling the display device 25, a display signal is transmitted from the HEV-ECU 27 to the control unit, and the display device 25 displays an image under the control of the control unit.

  The motor ECU 26 is a control unit that controls the electric motor 3 by controlling the inverter 6 in accordance with a command from the HEV-ECU 27. The motor ECU 26 includes a microprocessor that performs calculations, a ROM that stores programs for causing the microprocessor to execute each process, a RAM that stores various data such as calculation results, a backup RAM that holds the stored contents, and It has an input / output I / F and the like. For example, when the motor ECU 26 receives a motor control signal for the electric motor 3 from the HEV-ECU 27, the motor ECU 26 performs switching control for the inverter 6 based on the required torque indicated in the motor control signal.

  The HEV-ECU 27 is a control unit that comprehensively controls the engine 2 and the electric motor 3 that are the power source of the hybrid vehicle. The HEV-ECU 27 includes a microprocessor, a ROM, a RAM, a backup RAM, an input / output I / F, and the like, like the motor ECU 26. The HEV-ECU 27 obtains a required output for the engine 2, a required torque for the electric motor 3, and the like based on, for example, the accelerator pedal opening (driver's request), the driving state of the hybrid vehicle, the SOC of the high voltage battery 7, etc. An engine control signal indicating a required output or the like is transmitted to the engine ECU, and a motor control signal indicating a required torque or the like is transmitted to the motor ECU 26.

  In particular, the HEV-ECU 27 performs switching control for switching between the first charging unit 11 and the second charging unit 12 of the auxiliary battery 9. Specifically, the HEV-ECU 27 inputs the SOC of the high voltage battery 7 from the BCU 28 or derives the SOC of the high voltage battery 7 using the voltage and current of the high voltage battery 7 input from the BCU 28. Then, the HEV-ECU 27 determines whether or not the SOC of the high voltage battery 7 is equal to or lower than the permitted SOC. The permitted SOC is a lower limit value of the SOC at which the high voltage battery 7 can be used for charging the auxiliary battery 9 when the switching relay 24 is normal. The permission SOC is set based on the specifications of the high voltage battery 7, the electric motor 3, and the like, for example.

  When the SOC of the high-voltage battery 7 has not decreased to the permitted SOC, the HEV-ECU 27 performs control to open the switching relay 24 in order to charge the auxiliary battery 9 by the first charging means 11 (for example, switching) The coil of the relay 24 is not energized) and the DC-DC converter 8 is controlled to operate. When the SOC of the high-voltage battery 7 falls below the permitted SOC, the HEV-ECU 27 performs control to close the switching relay 24 in order to charge the auxiliary battery 9 by the second charging means 12 (for example, the switching relay 24), and the DC-DC converter 8 is stopped. Note that, when the auxiliary battery 9 is sufficiently charged, the HEV-ECU 27 may perform control so that charging is not performed by both the first charging unit 11 and the second charging unit 12. .

  The HEV-ECU 27 compares the voltage of the ISG battery 5 acquired from the voltage sensor 20 with the voltage of the auxiliary battery 9 acquired from the voltage sensor 21 after starting the closing control of the switching relay 24. The timing of this comparison may be performed after a predetermined time has elapsed since the start of the closing control. This predetermined time is, for example, a sufficient time required until the voltage of the ISG battery 5 and the voltage of the auxiliary battery 9 become substantially the same voltage when the switching relay 24 is normally closed. The HEV-ECU 27 determines that the switching relay 24 is abnormal when the voltage of the ISG battery 5 and the voltage of the auxiliary battery 9 are different, and the voltage of the ISG battery 5 and the voltage of the auxiliary battery 9 are determined. Are substantially the same voltage, it is determined that the switching relay 24 is normal. In this embodiment, the voltage sensor 20, the voltage sensor 21, and the HEV-ECU 27 constitute the abnormality detection means described in the claims.

  When it is determined that the switching relay 24 is abnormal (when charging by the second charging means 12 is not possible), the HEV-ECU 27 replaces the normal permit SOC with the abnormal permit SOC, and permits the high voltage battery 7 when the SOC is abnormal. In order to charge the auxiliary battery 9 by the first charging means 11 until the SOC is lowered to the SOC, control is performed to operate the DC-DC converter 8 until the SOC is lowered to the abnormality permitting SOC. The abnormality permitting SOC is a lower limit value of the SOC that can use the high voltage battery 7 to charge the auxiliary battery 9 when the switching relay 24 is abnormal. An SOC that is lower than the permitted SOC is set as the abnormality-permitted permitted SOC. When the SOC of the high-voltage battery 7 falls below the abnormality-permitted SOC, the HEV-ECU 27 performs control to stop the operation of the DC-DC converter 8. If it is determined that the switching relay 24 is abnormal, the HEV-ECU 27 shifts to a retreat travel mode in which the vehicle travels only with the driving force of the electric motor 3.

  Further, when the switching relay 24 is determined to be abnormal, the HEV-ECU 27 displays a display signal including image information indicating a warning message on the display device 25 in order to warn a vehicle occupant (particularly a driver). Send. This warning message is, for example, a message notifying that there is an abnormality in the vehicle (particularly an abnormality related to a battery). As a warning message, the message shown below may be added to the above-mentioned message. For example, a message notifying that the vehicle is driven only by the motor (EV traveling), a message for urging to suppress the power consumption, and refraining from acceleration. A message prompting the user to stop the vehicle in a safe place. Further, the HEV-ECU 27 transmits a motor control signal indicating a required torque and the like, which is limited as compared to the normal driving state of the hybrid vehicle, to the motor ECU 26 in order to limit the driving force by the electric motor 3. In this driving force control control, for example, an upper limit value of the required torque is set, and a required torque less than or equal to this upper limit value is set. If the switching relay 24 has an abnormality, the high voltage battery 7 is used for charging the auxiliary battery 9 until the SOC becomes lower than that in the normal case, so that the power consumption of the high voltage battery 7 is suppressed. These warning display control and driving force limit control are performed.

  With reference to FIG. 1, the flow of operation of the charging apparatus 1 will be described. In particular, the operation when the switching relay 24 is abnormal will be described with reference to the flowchart of FIG. FIG. 2 is a flowchart showing a flow of operation of the charging apparatus 1 according to the embodiment.

  The HEV-ECU 27 determines whether or not the SOC of the high voltage battery 7 is equal to or lower than the permitted SOC. When it is determined that the SOC of the high-voltage battery 7 is higher than the permitted SOC, the HEV-ECU 27 performs the opening control of the switching relay 24 and the operation control of the DC-DC converter 8. By this control, the switching relay 24 is opened, and the ISG battery 5 and the auxiliary battery 9 are electrically disconnected. The DC-DC converter 8 steps down the high voltage of the high voltage battery 7 and charges the auxiliary battery 9. In this way, the auxiliary battery 9 is charged by the first charging means 11 until the SOC of the high voltage battery 7 decreases to the permitted SOC.

  On the other hand, when it is determined that the SOC of the high voltage battery 7 is equal to or lower than the permitted SOC, the HEV-ECU 27 performs the closing control of the switching relay 24 and the operation stop control of the DC-DC converter 8. By this control, the switching relay 24 is closed (when the switching relay 24 is normal), and the ISG battery 5 and the auxiliary battery 9 are electrically connected. Thus, when the voltage of the auxiliary battery 9 is lower than the voltage of the ISG battery 5, the auxiliary battery 9 is charged from the ISG battery 5. The ISG battery 5 stores electrical energy generated by the ISG 4. Further, the DC-DC converter 8 stops operating. As described above, when the SOC of the high-voltage battery 7 is lowered to the allowable SOC or less, the auxiliary battery 9 is charged by the second charging means 12 switched from the first charging means 11.

  After starting the closing control of the switching relay 24, the HEV-ECU 27 determines whether or not the switching relay 24 has an abnormality by comparing the voltage of the ISG battery 5 and the voltage of the auxiliary battery 9 (S10). ). When it is determined in S10 that the voltage of the ISG battery 5 and the voltage of the auxiliary battery 9 are substantially the same voltage and the switching relay 24 is determined to be normal (No), the HEV-ECU 27 ends the process. In this case, the switching relay 24 is closed, and the auxiliary battery 9 is charged by the second charging means 12.

  When it is determined in S10 that the voltage of the ISG battery 5 is different from the voltage of the auxiliary battery 9 and the switching relay 24 is determined to be abnormal (Yes) (when charging by the second charging means 12 is not possible), The HEV-ECU 27 lowers the permission SOC that can use the high voltage battery 7 for charging the auxiliary battery 9 to the abnormality permission SOC, and the DC-DC converter 8 operates until the SOC of the high voltage battery 7 reaches the abnormality permission SOC. Operation control is performed (S12). By this control, the DC-DC converter 8 steps down the high voltage of the high-voltage battery 7 and charges the auxiliary battery 9 until the SOC of the high-voltage battery 7 becomes the allowable SOC at the time of abnormality (S12). Thus, when there is an abnormality in the switching relay 24, the auxiliary battery 9 is charged by the first charging means 11 until the SOC of the high-voltage battery 7 is lowered to a lower abnormality permission SOC than when the high voltage battery 7 is normal. The Note that when the SOC of the high-voltage battery 7 falls below the abnormality permitting SOC, the DC-DC converter 8 is deactivated and charging of the auxiliary battery 9 is stopped.

  Further, the HEV-ECU 27 transmits a display signal for displaying a warning message to the display device 25 (S14). Upon receiving this display signal, the display device 25 displays a warning message (S14). By observing this warning message, the vehicle occupant (especially the driver) may, for example, refrain from accelerating, stop at a safe place, or go to a dealer or repair shop.

  Further, the HEV-ECU 27 transmits a motor control signal indicating a required torque or the like that is limited compared with that in the normal state to the motor ECU 26 (S16). Upon receiving this motor control signal, the motor ECU 26 performs switching control on the inverter 6 based on the required torque indicated in the motor control signal (S16). The inverter 6 converts the DC power of the high voltage battery 7 into AC power according to this switching control, and supplies AC power to the electric motor 3 (S16). The electric motor 3 generates a driving force that is more limited than normal (S16). Thereby, since the electric power used with the electric motor 3 is suppressed, the power consumption in the high voltage battery 7 is suppressed.

  According to the charging device 1 according to the embodiment, when there is an abnormality in the switching relay 24, the switching relay 24 is configured to charge the first charging unit 11 until the abnormal-time permission SOC lower than the normal-time permitted SOC. The auxiliary battery 9 can be charged using the high voltage battery 7 up to a lower SOC than in the normal case. Thereby, even when there is an abnormality in the switching relay 24 (when charging by the second charging means 12 is not possible), the battery rise of the auxiliary battery 9 can be suppressed, and the vehicle can be prevented from being disabled due to the battery rise. .

  According to the charging device 1 according to the embodiment, the ISG battery 5 and the auxiliary battery 9 charged by the ISG 4 can be electrically connected via the switching relay 24, so that the ISG 4 mounted on the vehicle is installed. Can be used to configure the second charging means 12 and the auxiliary battery 9 can be charged. Further, according to the charging device 1 according to the embodiment, each voltage of the ISG battery 5 and the auxiliary battery 9 is detected, and an abnormality of the switching relay 24 is easily detected by comparing the detected two voltages. it can.

  According to the charging device 1 according to the embodiment, when the abnormality of the switching relay 24 is detected, the power consumption of the high voltage battery 7 can be suppressed by limiting the driving force by the electric motor 3. Moreover, according to the charging device 1 which concerns on embodiment, when the abnormality of the switching relay 24 is detected, the warning which notifies abnormality to a passenger | crew of a vehicle is performed, A high voltage is provided with respect to a passenger | crew (especially driver | operator). It is possible to promote suppression of power consumption of the battery 7. As a result, the power consumption of the high-voltage battery 7 used for charging the auxiliary battery 9 is suppressed up to an abnormality permitting SOC that is lower than when the switching relay 24 is normal, and the travelable distance of the retreat travel by the electric motor 3 is suppressed. Can be extended.

  According to the charging device 1 according to the embodiment, when the switching relay 24 is normal, the switching relay 24 switches the first charging unit 11 to the second charging unit 12 when the SOC of the high voltage battery 7 decreases to the permitted SOC. The power consumption of the high voltage battery 7 can be suppressed. Thereby, electric power can be stably supplied from the high voltage battery 7 to the electric motor 3.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, the present invention is applied to a one-motor hybrid vehicle, but the present invention is also applicable to a two-motor hybrid vehicle.

  In the above-described embodiment, the second charging unit is configured by using the ISG that is also used as the starter of the engine. However, another generator such as an alternator (AC generator) may be used as the second charging unit.

  In the above embodiment, each voltage of the auxiliary battery and the ISG battery is detected by the voltage sensor as the abnormality detection means, and the voltage of the two batteries is compared. However, as the abnormality detection means, the switching relay itself is used as the abnormality detection means. You may detect by other methods, such as providing a sensor.

  In the above-described embodiment, each control is performed by the HEV-ECU as a control unit, but each control may be performed by another control unit such as a battery ECU.

  In the above embodiment, when an abnormality of the switching relay is detected, a warning is displayed to the vehicle occupant and the driving force of the electric motor is limited. However, at least one of the warning and driving power is not limited. In addition, as a method of providing information when warning the occupant, other methods such as turning on a warning light or outputting a warning message may be used.

1 Charging Device 2 Engine 3 Electric Motor 4 ISG (Generator)
5 ISG battery (generator battery)
7 High voltage battery (battery for electric motor)
8 DC-DC converter 9 Auxiliary battery 11 First charging means 12 Second charging means 20 Voltage sensor (first voltage detecting means)
21 Voltage sensor (second voltage detection means)
22 voltage sensor 23 current sensor 24 switching relay (switching means)
26 Motor ECU
27 HEV-ECU (control means)
28 BCU

Claims (6)

A charging device for charging an auxiliary battery mounted on a vehicle including an electric motor as a power source,
An electric motor battery for supplying electric power to the electric motor;
First charging means for stepping down the voltage of the electric motor battery and charging the auxiliary battery;
Second charging means for charging the auxiliary battery in a different manner from the first charging means;
Switching means for switching between the first charging means and the second charging means;
A storage amount detecting means for detecting a storage amount of the battery for the electric motor;
An abnormality detecting means for detecting an abnormality of the switching means;
Control means for performing switching control for switching the switching means from the first charging means to the second charging means when the charged amount detected by the charged amount detecting means is reduced to a permitted charged amount;
With
When the abnormality detection unit detects the abnormality, the control unit charges the first charging unit until the storage amount of the electric motor battery decreases to a permitted storage amount at the time of abnormality lower than the permitted storage amount. A charging device characterized by being made to perform. Generator,
A generator battery charged by the generator;
With
2. The charging device according to claim 1, wherein the second charging unit charges the auxiliary battery from the generator battery charged by the generator. First voltage detecting means for detecting the voltage of the generator battery;
Second voltage detection means for detecting the voltage of the auxiliary battery;
With
The abnormality detection unit detects the abnormality by comparing the voltage detected by the first voltage detection unit with the voltage detected by the second voltage detection unit after the switching control is started. Item 3. The charging device according to Item 2. An engine as the power source;
The charging device according to claim 2, wherein the generator is a generator that also serves as a starter of the engine.   The charging device according to any one of claims 1 to 4, wherein when the abnormality detection unit detects the abnormality, the driving force by the electric motor is limited.   6. The charging device according to claim 1, wherein, when the abnormality detection unit detects the abnormality, information relating to the abnormality is provided to an occupant of the vehicle.

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