JP2015208190A - In-vehicle charging system - Google Patents

Abstract

An on-vehicle charging system capable of identifying a device in which an abnormality has occurred when charging a power storage device with power supplied from a power supply facility using the charging device. An in-vehicle charging system equipped with a charging device having a power conversion circuit that converts power supplied from a power supply facility outside a vehicle into a voltage that can be charged by a power storage device is supplied to the charging device from the power supply facility. Information on whether or not a first command signal for performing supply and a second command signal for performing power conversion of the power conversion unit are transmitted, and a voltage on the input side of the power conversion circuit. Whether or not an abnormality has occurred in the charging device when it is determined that an abnormality has occurred in the charging system based on the input voltage Va and the output voltage Vb that is a voltage on the output side of the power conversion circuit. The means for determining is provided. [Selection] Figure 2

Description

  The present invention relates to an in-vehicle charging system including a charging device that is mounted on a vehicle and charges a power storage device with electric power supplied from power supply equipment outside the vehicle.

  A power storage device mounted on a vehicle such as an electric vehicle or a plug-in hybrid vehicle is known. The power storage device is charged using the charging device in a state of being electrically connected to the power supply device via a charging cable (see Patent Document 1).

JP 2013-145735 A

  By the way, when there is an abnormality in the charging device mounted on the vehicle or the power supply facility outside the vehicle, the power storage device is not properly charged. In this case, repair / inspection will be carried out to remove the cause of the abnormality, but if the cause of the abnormality is not specified, repair / inspection will be carried out in both the charging device and the power supply facility. There was concern that unnecessary work and parts replacement would be carried out.

  Moreover, if it is specified whether the cause of the abnormality is a vehicle charging device or a power supply facility outside the vehicle, an emergency measure can be taken if charging is not properly performed at the time of charging. That is, it can be understood whether charging is possible if the power supply equipment connected to the charging device is changed or charging is impossible even if the power supply equipment is changed, and it is possible that convenience for the user is improved.

  An object of the present invention is to provide an in-vehicle charging system that can identify a device in which an abnormality has occurred when charging a power storage device with power supplied from a power supply facility using the charging device. .

  The present invention is an in-vehicle charging system for charging a power storage device mounted on a vehicle with power supplied from a power supply facility outside the vehicle, and converts the power supplied from the power supply facility to a voltage that can be charged by the power storage device. A charging device having a power conversion unit for conversion, a first command means for transmitting a first command signal for supplying power from the power supply facility to the charging device, and a power conversion unit performing power conversion A second command means for transmitting a second command signal; an input side voltage detection means for detecting an input voltage which is a voltage on the input side of the power conversion unit; and a power conversion unit provided in the charging device. Output side voltage detecting means for detecting the output voltage which is the output side voltage, information on whether or not the first command signal and the second command signal are respectively transmitted, and the input voltage detected by each voltage detecting means And output power Based on the bets, abnormality is and its abnormality has occurred, characterized in that it comprises, an abnormality judging means for judging whether occurring in the charging device in the charging system.

  According to the above invention, in the charging apparatus, the first command signal for causing the power supply to the charging apparatus in the power supply facility outside the vehicle, and the second command signal for causing the power conversion unit to perform power conversion, The input voltage and the output voltage of the power conversion unit change according to the transmission state of. In the present invention, in consideration of this point, the charging system uses the information on whether or not the first command signal and the second command signal are transmitted, and the input voltage and output voltage of the power conversion unit. An abnormality judgment was implemented. Here, since there is a difference in the input voltage and output voltage of the power conversion unit between the case where the abnormality occurs is the charging device and the case where it is a power supply facility, appropriately identify whether or not an abnormality has occurred in the charging device it can.

1 is an overall configuration diagram of an in-vehicle charging system. The flowchart of an abnormality determination process.

  Hereinafter, an embodiment in which an in-vehicle charging system according to the present invention is applied to a vehicle including a rotating machine as an in-vehicle main unit such as a plug-in hybrid vehicle or an electric vehicle will be described with reference to the drawings.

  In the in-vehicle charging system of FIG. 1, the vehicle 1 is equipped with a charging device 10, a charging inlet 19, a power storage device 20, a system main relay (hereinafter referred to as SMR 23), and a main ECU 30. A power supply device 90 and a charging cable 70 are provided outside the vehicle 1 as power supply facilities. FIG. 1 shows a state where the vehicle 1 and the power supply device 90 are connected by the charging cable 70.

  The power storage device 20 is a DC power source for driving a vehicle, and is configured by an assembled battery including a serially connected secondary battery such as a lithium ion storage battery or a nickel hydride storage battery. The power storage device 20 stores power supplied from the power supply device 90. In addition, electric power generated by a motor generator (not shown) is stored.

  The SMR 23 is provided in the power line pair P <b> 2 between the power storage device 20 and the charging device 10. SMR 23 is turned on when charging device 10 is charged, and electrically connects power storage device 20 and charging device 10. On the other hand, when charging by charging device 10 is stopped, it is turned off, and electrical storage device 20 and charging device 10 are electrically disconnected.

  The charging inlet 19 is a power interface that receives power from the power supply device 90 via the charging cable 70, and is connected to the charging device 10 by a power line pair P1.

  The charging cable 70 includes a connector 71, a plug 72, and a CCID (Charging Circuit Interrupt Device) 70a.

  The connector 71 is configured to be connectable to the charging inlet 19 of the vehicle 1. The connector 71 has a limit switch 71a. When the connector 71 is connected to the charging inlet 19, the limit switch 71a is activated (turned on), indicating that the connector 71 is connected to the charging inlet 19. A cable connection signal PISW is output. The cable connection signal PISW is input to the main ECU 30 via the signal line pair L4.

  The plug 72 is connected to a power outlet 92 of the power supply device 90. For example, the power outlet 92 is provided in a house and is supplied with AC power from the AC power source 91.

  The CCID 70a includes a relay 75 and an EVSE 76 (Electric Vehicle Supply Equipment). The relay 75 is provided in the power line pair P1 between the power supply device 90 and the charging device 10, and this corresponds to a power path switch. When relay 75 is off, the electric path for supplying power from power supply device 90 to vehicle 1 is interrupted. When relay 75 is on, power can be supplied from power supply device 90 to vehicle 1.

  The EVSE 76 is driven by the power of the AC power supply 91 with the plug 72 connected to the power outlet 92, and generates a pilot signal CPLT by oscillation of an oscillator (not shown). When connector 71 and charging inlet 19 are connected, pilot signal CPLT is transmitted to vehicle 1 (charging device 10) via signal line L3. When the connector 71 and the charging inlet 19 are not connected, the pilot signal CPLT is not detected on the vehicle 1 side, but if the plug 72 is connected to the power outlet 92, the pilot signal CPLT is output.

  Pilot signal CPLT is subjected to potential operation on the vehicle 1 side. EVSE 76 controls the state of relay 75 based on the voltage of pilot signal CPLT. That is, in the vehicle 1, the relay 75 can be remotely operated by operating the voltage of the pilot signal CPLT. It is assumed that pilot signal CPLT conforms to “SAE J1772 (SAE Electric Vehicle Conductive Charge Coupler)” in the United States.

  The charging device 10 charges the power storage device 20 with power from the power supply device 90, and includes a power conversion circuit 10a, a charging control circuit 10b, and voltage sensors 21 and 22.

  The power conversion circuit 10a is a circuit for converting the power of the power supply device 90 into power that can be charged by the power storage device 20, and the AC / DC circuit 11 that converts the AC voltage of the power supply device 90 into a DC voltage. A DC / DC circuit 12 that boosts the charging voltage of the power storage device 20 is provided.

  The voltage sensor 21 is provided in the power line pair P1 between the charging inlet 19 and the power conversion circuit 10a, and detects the power supplied from the power supply device 90, that is, the input voltage that is the voltage on the input side of the power conversion circuit 10a. . The voltage sensor 22 is provided in the power line pair P2 between the SMR 23 and the power conversion circuit 10a, and detects an output voltage that is a voltage on the output side of the power conversion circuit 10a.

  The charging control circuit 10b controls the operation of the charging apparatus 10, and in this embodiment, includes a CPU 13, a CPU 14, an integrated CPU 15 connected to the CPU 14, and a start-up dedicated circuit 16.

  The CPU 13 controls power conversion by the AC / DC circuit 11. The CPU 14 controls power conversion by the DC / DC circuit 12.

  The activation dedicated circuit 16 activates the CPUs 13 to 15 when the CPUs 13 to 15 are powered off. The integrated CPU 15 transmits / receives signals to / from the CPUs 13, 14 and transmits / receives signals to / from the main ECU 30. That is, the integrated CPU 15 outputs a command signal to each of the CPUs 13 and 14 based on the charging command signal from the main ECU 30 to control the power conversion operation by the charging device 10.

  Further, the pilot signal CPLT is input to the charge control circuit 10b (integrated CPU 15) through the signal line L3. A resistance circuit 18 for operating the potential of the pilot signal CPLT is connected to the signal line L3.

  The resistance circuit 18 includes pull-down resistors R1 and R2 and a switch SW1. The pull-down resistor R1 is connected between the signal line L3 and the body ground G of the vehicle 1. The pull-down resistor R2 is connected in series with the switch SW1, and is connected in parallel to the pull-down resistor R1. The state of the switch SW1 (on / off) is switched by the integrated CPU 15.

  For example, although the power supply device 90 and the charging cable 70 are connected, the potential V1 (for example, 12V) of the pilot signal CPLT output from the EVSE 76 when the charging cable 70 and the charging device 10 are not connected. In this case, when the connector 71 and the charging inlet 19 are connected, the pilot signal CPLT is lowered to a specified potential V2 (for example, 9 V) by the pull-down resistor R1 of the resistor circuit 18.

  When the switch SW1 is turned on by the integrated CPU 15, the pilot signal CPLT is lowered to a specified potential V3 (for example, 6V) by the pull-down resistors R1 and R2 of the resistor circuit 18. Then, when pilot signal CPLT is lowered to potential V3, relay 75 is turned on, and the power of power supply device 90 can be supplied to vehicle 1 via charging cable 70.

  The main ECU 30 detects the state of the charging device 10, the power storage device 20, and the like and outputs a control signal for controlling each device. That is, the main ECU 30 controls a start signal for starting the integrated CPU 15, a first command signal for starting power supply from the power supply device 90 to the charging device 10 via the charging cable 70, and power conversion by the power conversion circuit 10a. To output a second command signal.

  The activation signal is transmitted to the activation-dedicated circuit 16 when the main ECU 30 detects a signal from a charging start switch (not shown) while the vehicle 1 is stopped (the ignition switch (not shown) is off). When the activation dedicated circuit 16 receives the activation signal, the integrated CPU 15 in the stopped state is activated. The charging start switch is provided on either the power supply facility side or the vehicle side.

  The first command signal is transmitted to the integrated CPU 15 when the main ECU 30 receives the cable connection signal PISW and is the potential V2 of the pilot signal CPLT received via the integrated CPU 15. When the integrated CPU 15 receives the first command signal, the switch SW1 is turned on. As a result, the potential V2 of the pilot signal CPLT drops to V3, and accordingly, the relay 75 of the CCID 70a is turned on. Then, the power of the power supply device 90 is supplied to the vehicle 1 via the charging cable 70.

  The second command signal is transmitted to the integrated CPU 15 based on the detection result of the state of charge (SOC) of the power storage device 20 by the main ECU 30 when the power storage device 20 is charged. When the integrated CPU 15 receives the second command signal, it transmits a predetermined command signal to the CPUs 13 and 14, and causes the AC / DC circuit 11 and the DC / DC circuit 12 to perform power conversion under the control of the CPUs 13 and 14. .

  By the way, in the in-vehicle charging system, there is a possibility that abnormality such as disconnection, welding, sensor failure, etc. may occur in the vehicle side such as the charging device 10 or the power supply equipment outside the vehicle such as the power supply device 90 and the charging cable 70. . Specifically, failure of the voltage sensors 21 and 22 may occur on the charging device 10 side, and the relay 75 may be closed abnormally on the power supply facility side. When such an abnormality occurs in each device, there is a possibility that the charging operation based on the command signal from the main ECU 30 may not be appropriately performed.

  Therefore, if there is an abnormality inside or outside the vehicle, repairs and inspections will be carried out to remove the cause, but if the cause of the abnormality is not specified, both the vehicle side and the power supply facility will perform repairs and inspections. There is a concern that unnecessary work and parts replacement may occur due to the need to be implemented.

  Therefore, in this embodiment, when there is an abnormality inside or outside the vehicle, the main ECU 30 determines whether the cause of the abnormality is the charging device 10 side or the power supply device 90 side. That is, when the main ECU 30 does not output the first command signal and the second command signal, an abnormality occurs in the in-vehicle charging system based on the input voltage and the output voltage detected by the voltage sensors 21 and 22. In such a situation, the process of identifying whether the cause of the abnormality is the vehicle 1 (charging device 10) or the power supply facility outside the vehicle is performed. In this way, when there is an abnormality in the in-vehicle charging system, the cause is specified as the vehicle side or the power supply facility side, so that the subsequent treatment can be performed more appropriately. That is, it is possible to suppress unnecessary repair / inspection work when there is no abnormality in the charging device 10.

  Next, the abnormality determination process performed by the main ECU 30 will be described with reference to FIG. In the following processing, the power outlet 92 of the power supply device 90 and the plug 72 of the charging cable 70 are physically connected, and the connector 71 of the charging cable 70 and the charging inlet 19 of the vehicle 1 are physically connected. The SMR 23 is off and the integrated CPU 15 of the charging apparatus 10 is activated by the activation signal.

  First, in step S10, it is determined whether or not the temporary abnormality determination flag is off. Note that the abnormality temporary determination flag is off in the initial state, the first command signal and the second command signal are not output in the processing described later, the input voltage Va is equal to or higher than the threshold value α, and the output voltage Vb is Turned on when below the threshold β.

  If it is determined in step S10 that the temporary abnormality determination flag is off, it is determined in step S11 whether or not the first command signal is output to the charging apparatus 10 (integrated CPU 15).

  If the first command signal is not output, it is determined in step S12 whether the second command signal is not output. If the second command signal is not output, it is determined in step S13 whether or not the input voltage Va detected by the voltage sensor 21 is equal to or greater than a predetermined threshold value α. The threshold value α is, for example, zero or a value near zero. The threshold value α may be set to a value smaller than the potential of the power supplied from the power supply device 90.

  If an affirmative determination is made in step S13, that is, if the input voltage Va ≧ α, it is determined in step S14 whether or not the output voltage Vb detected by the voltage sensor 22 is less than the threshold value β. The threshold β is, for example, zero or a value near zero. Threshold value β may be set to a value smaller than the charging voltage of power storage device 20.

  If an affirmative determination is made in step S14, that is, if the output voltage Vb <β, the abnormal provisional determination flag is turned on in step S15.

  On the other hand, if it is determined in step S10 that the abnormal temporary determination flag is on, the process proceeds to step S16, and a second command signal is output. That is, when the input voltage Va ≧ α and the output voltage Vb <β, there is a possibility of abnormality in both the power supply facility side and the charging device 10. Therefore, in this case, the power conversion circuit 10a outputs the second command signal without outputting the first command signal, and does not output the command to supply power from the power supply device 90. Perform power conversion. Thereby, it is specified whether the cause of the abnormality is the power supply facility side or the charging device 10 side.

  In step S17, it is determined whether or not the output voltage Vb <β. If an affirmative determination is made in step S15, that is, if the output voltage Vb does not change even after the power conversion by the power conversion circuit 10a, the abnormality of the voltage sensor 21 occurs on the charging device 10 side in step S18. It is determined that

  On the other hand, if a negative determination is made in step S17, that is, if the output voltage Vb has changed, it is determined in step S19 that the power supply facility is abnormal. That is, when the input voltage Va ≧ α and the output voltage Vb is changed by performing power conversion, the charging device 10 operates normally. Therefore, in this case, it can be determined that the power supply facility is abnormal, for example, an ON failure of the relay 75 of the charging cable 70.

  If a negative determination is made in step S13, that is, if the input voltage Va <α, it is determined in step S20 whether or not the output voltage Vb is greater than or equal to the threshold value β. If the determination is affirmative, that is, if the input voltage Va <α, but the output voltage Vb ≧ β, it is determined in step S21 that the voltage sensor 21 abnormality has occurred on the charging device 10 side. On the other hand, when a negative determination is made in step S20, that is, when the input voltage Va <α and the output voltage Vb <β when the first command signal and the second command signal are not output, the charging device 10 and the power source It is determined that there is no abnormality in the equipment and the in-vehicle charging system is normal.

  In addition, this process is complete | finished when negative determination is carried out by step S11, S12, S14. When it is determined that an abnormality has occurred on the power supply facility side or the charging device 10 side, the main ECU 30 may notify the user of the occurrence of the abnormality by a notification means such as a display or sound.

  According to the above, the following excellent effects can be obtained.

  The abnormality determination in the present charging system is performed based on the information indicating whether or not the first command signal and the second command signal are transmitted, respectively, and the input voltage Va and output voltage Vb of the power conversion circuit 10a. I made it. Here, there is a difference in the input voltage Va and the output voltage Vb of the power conversion circuit 10a between the case where the abnormality occurs in the charging device 10 and the case where the power supply facility (the power supply device 90 and the charging cable 70) is charged. It is possible to appropriately specify whether or not an abnormality has occurred in the device 10.

  When the output voltage Vb is detected in a state where neither the first command signal nor the second command signal is transmitted, an abnormality has occurred in the charging device 10. Therefore, regardless of the input voltage Va, when the output voltage Vb is equal to or higher than the threshold value β, it can be specified that an abnormality has occurred in the charging apparatus 10.

  When the second command signal is transmitted when the input voltage Va is equal to or higher than the threshold value α and the output voltage Vb is lower than the threshold value β in a state where neither the first command signal nor the second command signal is transmitted. When the charging device 10 is normal, the output voltage Vb changes, and when the abnormality occurs in the charging device 10, the output voltage Vb does not change. By using this, it can be determined whether an abnormality has occurred in the charging apparatus 10.

  When the input voltage Va is detected and the output voltage Vb is not detected in a state where neither the first command signal nor the second command signal is transmitted, there is an abnormality on the charging device 10 or the power supply equipment side. there is a possibility. In this case, the second command signal is transmitted to perform power conversion by the power conversion circuit 10a. In this case, it can be specified whether the abnormality is in the charging device 10 or the power supply facility (the power supply device 90 or the charging cable 70) depending on whether the output voltage Vb has changed.

  The present invention is not limited to the description of the above embodiment, and may be implemented as follows. In the following description, the same components as those described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the above, when the first command signal and the second command signal are not transmitted, it is determined whether or not an abnormality has occurred in the charging device 10 based on both the input voltage Va and the output voltage Vb. Yes. In addition to this, when the first command signal and the second command signal are not transmitted, and the output voltage Vb ≧ β, there is an abnormality on the charging device 10 side regardless of the presence or absence of the input voltage Va. It has occurred. Therefore, whether or not the charging device 10 is abnormal may be determined based on only the output voltage Vb under a situation where the first command signal and the second command signal are not transmitted.

  In the above, when the first command signal and the second command signal are not transmitted, the abnormality determination of both the charging device 10 and the power supply facility is performed. In addition to this, one abnormality determination of the charging device 10 or the power supply facility may be performed. For example, the presence / absence of an abnormality in only the charging device 10 may be determined. In this case, if a negative determination is made in step S17 of FIG. 2, it may be determined in step S19 that the charging apparatus 10 is normal.

  -In above-mentioned FIG. 2, you may determine step S11 based on whether the charging device 10 side received the 1st command signal. For example, the main ECU 30 determines whether or not the charging apparatus 10 has received the first command signal based on the potential information of the pilot signal CPLT transmitted from the integrated CPU 15 and information such as the state of the switch SW1. If the charging device 10 has not received the first command signal, the process proceeds to step S12. If the charging device 10 has received the first command signal, the process may be terminated.

  α ... threshold, 1 ... vehicle, 10 ... charge device, 20 ... electric storage device, 21 ... voltage sensor, 22 ... voltage sensor, 70 ... charge cable, 90 ... power supply device.

Claims (5)

An on-vehicle charging system for charging a power storage device (20) mounted on a vehicle (1) with electric power supplied from a power supply facility (70, 90) outside the vehicle,
A charging device (10) including a power conversion unit (10a) for converting the power supplied from the power supply facility into a voltage that can be charged by the power storage device;
First command means (30) for transmitting a first command signal indicating that power is supplied from the power supply facility to the charging device;
Second command means (30) for transmitting a second command signal for effecting power conversion of the power converter;
Input side voltage detection means (21) provided in the charging device for detecting an input voltage which is a voltage on the input side of the power conversion unit;
An output side voltage detection means (22) provided in the charging device for detecting an output voltage which is a voltage on the output side of the power converter;
An abnormality has occurred in the charging system based on the information indicating whether or not the first command signal and the second command signal are transmitted, respectively, and the input voltage and output voltage detected by the voltage detection means. An on-vehicle charging system comprising: an abnormality determining unit (30) that determines whether or not the abnormality has occurred in the charging device.   If the output voltage is equal to or higher than an output side threshold (β) in a state where neither the first command signal nor the second command signal is transmitted, the abnormality determination unit has an abnormality in the charging device. The in-vehicle charging system according to claim 1, which is determined as follows.   The abnormality determination unit is configured such that the input voltage is not less than the input side threshold (α) and the output voltage is less than the output side threshold in a state where neither the first command signal nor the second command signal is transmitted. In some cases, the second command signal is switched to a transmission state, and if the output voltage remains below the output-side threshold, it is determined that an abnormality has occurred in the charging device, and the output voltage is greater than or equal to the output-side threshold. The in-vehicle charging system according to claim 2, wherein it is determined that no abnormality has occurred in the charging device.   The abnormality determination unit is configured such that the input voltage is not less than the input side threshold value and the output voltage is less than the output side threshold value when neither the first command signal nor the second command signal is transmitted. The on-vehicle charging system according to claim 3, wherein the second command signal is switched to a transmission state, and it is determined that an abnormality has occurred in the power supply facility when the output voltage becomes equal to or higher than the output side threshold. The power supply facility includes an external power supply device (90) that outputs external power, and a charging cable (70) that connects the external power supply device and the charging device,
The first command signal is a switch close command signal for closing a power path switch (75) included in the charging cable,
The in-vehicle charging system according to claim 4, wherein the abnormality determination unit determines a closing abnormality of the power path switch as an abnormality of the power supply facility in a state where the switch closing command signal is transmitted.

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