JP5867726B2 - Power supply system and power supply device used therefor - Google Patents

Description

  The present invention converts power stored in an in-vehicle battery of an electric vehicle by a power supply device outside the vehicle, and supplies the power to various devices outside the vehicle, for example, various devices such as ordinary houses, and the system. More specifically, the present invention relates to the power supply device. More specifically, a message relating to the power supply is transmitted and received between the electronic control unit (ECU) in the electric vehicle and the power supply device by CAN (Controller Area Network) communication. The present invention relates to a power supply system for supplying power and a power supply apparatus used therefor.

  There are two types of electric vehicles: vehicles using only an electric motor as a drive source, and hybrid vehicles including an electric motor and an engine as drive sources. In any type of electric vehicle, a large-capacity vehicle-mounted battery is mounted as an electricity storage device in order to supply electric power to the electric motor. Communication between the battery control unit that controls the in-vehicle battery, the charge control unit, the charger inside and outside the vehicle, and the like is performed based on CAN communication (see Patent Document 1).

  In recent years, attention has been focused on the use of the power stored in the in-vehicle battery as a power source for devices such as televisions, washing machines, personal computers and the like due to the storage capacity of such in-vehicle batteries. For example, such an in-vehicle battery has a large capacity that, when fully charged, can cover about two days of electric power used by a general household on a daily basis.

  Under such circumstances, a power supply system that converts the stored electric power of the in-vehicle battery and supplies it to a device such as a general house by a power supply device has been put into practical use. An electronic control unit (ECU) in an electric vehicle and a power supply device Messages are transmitted / received by CAN communication to supply power to devices such as ordinary houses from the power supply device.

JP 2012-050156 A

  In a conventional power supply system, a message is transmitted / received by CAN communication between a power supply device on the outside of the vehicle and an electronic control device on the inside of the vehicle, and based on the transmission / reception, the power supply device stores the stored voltage of the in-vehicle battery (for example, DC 400V). ) Is converted to a low voltage (for example, AC 100V) and then supplied to a device such as a general house, but on the power supply device side, even if one of the messages is interrupted due to the influence of disturbance noise, etc., Diagnoses that an abnormality has occurred and forcibly stops the power supply to devices such as ordinary houses.

  However, the message includes a message that does not need to be stopped until the power supply is stopped, such as voltage information of the in-vehicle battery. Even if such a message is lost due to communication interruption or other reasons, if the stored power of the in-vehicle battery cannot be used as a power source for equipment such as a general house, for example, due to a power failure, the stored power of the in-vehicle battery will be used instead. The user will be greatly disadvantaged.

  The present invention has been made in view of the above circumstances, and for messages that do not need to be stopped until the power supply other than the specific important message is excluded from among a plurality of messages, the communication is interrupted or the like. Even if it is lacking, it is an object to be solved to provide a power supply system that can use the stored power of the on-vehicle battery as a power source for a device such as a general house and a power supply device used therefor.

  (1) A power supply system according to the first aspect of the present invention includes a vehicle-side battery on the vehicle side, an electronic control device that controls at least a discharge operation from the vehicle-mounted battery, and the stored power of the vehicle-mounted battery to convert the power stored outside the vehicle. A power supply device that supplies the device as its power supply, and the electronic control device and the power supply device transmit and receive messages by packet communication between them. In the power supply system for performing the power supply operation and stopping the power supply operation, the power supply device includes at least discharge permission for the in-vehicle battery among a plurality of messages transmitted and received by packet communication with the electronic control device and When reception of a message (message 1) including a discharge stop is interrupted, The supply operation is stopped, characterized by continuing also power supply operation to the outside of the device receiving the other message (message 2) is interrupted.

  According to the first aspect of the present invention, when the reception of the message 1 is interrupted, the power supply operation to the device outside the vehicle is stopped, while the power supply operation to the device outside the vehicle is stopped even if the reception of the message 2 is interrupted. Since the operation continues, the user can use the stored power of the in-vehicle battery from the electric vehicle side as a power source for devices outside the vehicle even when the commercial power supply to the house is interrupted, for example.

  In the first aspect of the present invention, a preferred aspect is that the power supply device stops the power supply operation to the device outside the vehicle when the message 1 cannot be received within a predetermined time.

  (2) A power supply device according to the second aspect of the present invention is a power supply device used in the power supply system of (1), and when the reception of the message 1 is interrupted, power is supplied to devices outside the vehicle. The operation is stopped, and the power supply operation to the device outside the vehicle is continued even if reception of the message 2 is interrupted.

  In the second aspect of the present invention, a preferred embodiment is a CPU that controls the entire power supply device, a communication interface that is controlled by the CPU and packet-communication with the electronic control device, and that converts the stored power under the control of the CPU. A converter that converts the stored power of the in-vehicle battery by controlling the converter, and supplies the converted power to a device outside the vehicle as a power source, and the electronic control unit and the communication interface And if the message 1 is not included in the message received by this packet communication, the conversion operation of the converter is stopped, the power supply operation to the device outside the vehicle is stopped, and The message 1 is included in the message received by the packet communication. If so, without stopping the conversion operation of the converter to continue the power supply operation to the outside of the device.

  In the second aspect of the present invention, a more preferable aspect includes a display lamp that is turned on by the CPU. When the CPU receives the message 1, the CPU controls the display lamp to be turned on.

  Note that CAN communication is preferably used as packet communication (communication in packet units).

  According to the present invention, when a message interruption occurs due to packet communication between the power supply apparatus and the electronic control apparatus, if the communication interruption message is the message 1, the power supply operation to the device outside the vehicle is performed. However, if the communication interruption message is message 2, the power supply operation to the device outside the vehicle can be continued, so that the user can use the stored power of the in-vehicle battery on the electric vehicle side to supply power to the device outside the vehicle. Can be used.

FIG. 1 is a block diagram of a power supply system according to an embodiment of the present invention. FIG. 2 is a flowchart for explaining a system operation in the power supply system. FIG. 3 is a detailed block diagram of a power supply device used in the power supply system of FIG.

  Hereinafter, a power supply system and a power supply apparatus used therefor according to embodiments of the present invention will be described with reference to the accompanying drawings. The power supply system will be described with reference to FIG. 1 and FIG. FIG. 1 is a block diagram of a power supply system according to an embodiment of the present invention, and FIG. 2 is a flowchart for explaining a system operation in the power supply system.

  With reference to FIG. 1, the power supply system of this embodiment is demonstrated. In FIG. 1, (inside the vehicle) indicates the inside of a vehicle equipped with an in-vehicle battery such as an electric vehicle, and (outside of the vehicle) indicates the outside of the vehicle. Hereinafter, when an electric vehicle is described as an example of the vehicle, the electric vehicle includes an in-vehicle battery 1 and an electronic control device 2 that controls charging and discharging operations of the in-vehicle battery. The power supply device 3 is located outside the vehicle, and is connected to the in-vehicle battery 1 via a power cable for discharging, and is connected to the electronic control device 2 via a CAN communication line. The power supply device 3 transmits / receives a message to / from the electronic control device 2 outside the electric vehicle by CAN communication, converts the stored power of the in-vehicle battery 1 by this transmission / reception, and converts the converted stored power into The power is supplied to the equipment 4 outside the vehicle. The electric vehicle is appropriately equipped with a power connector 5 to which the discharge cable is connected and a communication connector 6 to which a CAN communication line is connected, for example, on the side of the vehicle body. The power cable and the CAN communication line from the power supply device 3 are connected to the connectors 5 and 6, respectively. Although this connection mode is not shown, the present invention is not limited to this connection mode. Further, the power supply device 3 is connected to a device 4 outside the vehicle by a power line. Although the connection mode is not shown, the present invention is not limited to this connection mode.

  Here, the device 4 outside the vehicle is a device that receives power supply from the power supply device 3 outside the vehicle, such as a television, an air conditioner, a personal computer, a vacuum cleaner, and other various devices. There are no particular limitations on the value of the operating voltage of various devices or the operating voltage being direct current or alternating current. Although not shown, the power supply device 3 and the device 4 outside the vehicle may be connected to each other by connecting the power lines with a plug and an outlet.

  An electric vehicle is equipped with a plurality of electronic control units. These control objects include various pressures, for example, traveling control such as steering and suspension, body control such as a power window, safety system control such as an airbag, There are also multimedia controls such as car navigation and audio.

  And the electronic control apparatus 2 of embodiment may serve as the electronic control apparatus which can perform such various control in a vehicle, or it is related with the vehicle-mounted battery 1 between power supply apparatuses separately from such control. A dedicated electronic control device for controlling the CAN communication may be used, and the use form is not particularly limited.

  The electronic control device 2 includes a CPU, various memories, a CAN communication interface, and the like, although the internal configuration blocks are not particularly illustrated. The CPU executes the control program stored in the memory to monitor the stored voltage of the in-vehicle battery 1 and others, or transmits a message through CAN communication with the power supply device 3 via the CAN communication interface. And control reception.

  There are a plurality of messages handled by CAN communication, and these messages are classified into two types of messages in this embodiment. One is message 1 for stopping the power supply operation from the power supply device 3 to the equipment 4 outside the vehicle under certain conditions if there is a lack on the CAN bus due to communication interruption, and the other is due to communication interruption There is a message 2 for continuing the power supply operation from the power supply device 3 to the equipment 4 outside the vehicle even if it is absent on the CAN bus.

  The message 1 is a message indicating discharge permission, discharge stop and abnormality of the in-vehicle battery 1, and is a message for stopping the power supply operation from the power supply device 3 to the device 4 outside the vehicle when it is absent due to communication interruption or the like. The electronic control unit 2 monitors the state of the in-vehicle battery 1, the stored voltage of the in-vehicle battery is sufficiently high, and is in a state where it can be discharged. When the message 1 indicates that the discharge is stopped, and when there is any abnormality in the power supply device 3 or the like, the message 1 is transmitted to the power supply device 3 as abnormality information.

  The message 2 includes a message 2-1 such as battery voltage and battery input current as monitor information, and a message 2-2 such as charging time and remaining battery capacity. In the embodiment, the message 2-1 A message that continues the power supply operation from the power supply device 3 to the device 4 outside the vehicle even if it is absent on the CAN bus due to communication interruption or the like, such as 2-2, is collectively referred to as a message 2. The electronic control device 2 transmits these messages 2 to the power supply device 3.

  Next, the power supply operation by the power supply system will be described with reference to FIG. Each step in the flowchart of FIG. 2 is executed by a CPU (power supply side CPU) in the power supply device 3.

  In step n1, it is determined whether or not the power supply device 3 is connected to the vehicle. Specifically, the determination of the connection is, for example, whether or not the power cable or the CAN communication line of the power supply device 3 is connected to the connectors 5 and 6 provided in the electric vehicle. The supply-side CPU may determine the connection state based on, for example, a detection result of a sensor (not shown), or may perform the determination in step n1 based on this detection signal.

  If the power supply device 3 is connected to the vehicle in step n1 and the determination is YES, the process proceeds to step n2.

  In step n2, it is determined whether or not the in-vehicle battery 1 is discharging to the power supply device 3. Specifically, for example, the electronic control device 2 transmits information on the discharge of the in-vehicle battery 1 to the power supply device 3 by CAN communication to determine whether or not the power supply device 3 is supplying power. The side CPU may determine whether or not the in-vehicle battery 1 is being discharged based on this information.

  If the in-vehicle battery 1 is being discharged to the power supply device 3 in step n2 and it is determined YES, the process proceeds to step n3.

  In step n3, it is determined whether or not the state in which the reception of the message 1 is interrupted has continued for a predetermined time T1. As described above, the message 1 has some abnormality in the discharge permission message for permitting the discharge of the in-vehicle battery 1, the discharge stop message for stopping the discharge of the in-vehicle battery 1, and the power supply device 3 or the like. A message indicating that

  If the state in which the reception of the message 1 is interrupted at step n3 continues for a certain time T1, it is determined as YES and the process proceeds to step n4.

  In step n4, for example, the operation of supplying power from the converter that converts the stored power of the in-vehicle battery 1 to the device 4 outside the vehicle is stopped and the lamp is turned on to notify the user.

  Even if the reception of the message 1 is interrupted in step n3, if the interrupted state does not continue for a certain time T1, it is determined as NO and the process proceeds to step n5. Since these messages 1 may be missing due to noise or the like, the message 1 is accurately received by repeating the transmission of the message 1 a plurality of times within the predetermined time T1.

  In step n5, it is determined whether or not the message 2 reception has been interrupted for a certain period of time T2 (> T1). As described above, the message 2 is a message indicating the voltage, input current, discharge time, remaining capacity, etc. of the in-vehicle battery 1.

  If it is determined in step n5 that the message 2 reception has been interrupted for a certain period of time T2 (> T1) and YES is determined, the process proceeds to step n6. The reason for determining the message 1 reception interruption time T1 in step n5 is shorter than the determination time T2 in step 5 because it is not preferable that the communication interruption state of the message 1 continues for a long period of time. The reason why the determination time T2 in Step 5 is long is that even if communication is interrupted for a relatively long period of time, the power supply operation is not particularly affected.

  In step n6, the power supply operation to the device 4 outside the vehicle is continued, and the history of the message 2 reception interruption is stored in the memory. It is not always necessary to store this history.

  According to the above flowchart, in the power supply system of the embodiment, when the message 1 including the discharge permission and the discharge stop of the stored power is interrupted among the messages 1 and 2, the power supply from the power supply device to the device outside the vehicle Stop supply operation. On the other hand, since the power supply operation to the device outside the vehicle can be continued even if the reception of the message 2 is interrupted, even if the communication of the message 2 is interrupted, the user can, for example, lose the commercial power supply to the house. Instead, the stored electric power of the in-vehicle battery can be used as a power source for devices outside the vehicle from the electric vehicle side instead.

  The detailed configuration of the power supply device 3 will be described with reference to FIG.

  The power supply device 3 according to the embodiment includes a CAN between a converter 3a that converts the stored voltage of the in-vehicle battery 1 into an operating voltage of the device 4 outside the vehicle, and a CPU (not shown) built in the electronic control device 2. A CPU 3b that communicates, a power supply IC 3c that supplies operating power to the CPU 3b, a lamp 3d that lights up when the communication of the message 1 is interrupted, and displays the communication interruption of the message 1 to the user, and the CPU 3b and the electronic control unit 2 A CAN communication interface 3e for CAN communication with the CPU, and a memory 3f including a control program storage area of the CPU 3b, a data area necessary for the operation of the CPU 3b, and the like. Converter 3a includes both a DC / DC converter and a DC / AC converter.

  The CPU 3b executes the flowchart shown in FIG. 2 according to the control program stored in the memory 3f.

  If the device 4 outside the vehicle is, for example, 100V AC, the CPU 3b controls the converter 3a to convert the stored voltage of the in-vehicle battery 1 into a low voltage of 100V AC, and the converter 3a transfers the low voltage of 100V AC to the device 4 outside the vehicle. Supply.

  In addition, the CPU 3b performs CAN communication with the electronic control device 2 side via the CAN communication interface 3e. If the message received by the CAN communication does not include the message 1, the CPU 3b stops the voltage conversion operation of the converter 3a. Then, the power supply operation to the equipment 4 outside the vehicle is stopped.

  Further, if the message 1 is included in the message received by CAN communication (even if the message 2 is not included), the CPU 3b does not stop the voltage conversion operation of the converter 3a and supplies power to the device 4 outside the vehicle. Continue supplying operation.

  If the message 1 includes abnormality information, the CPU 3b stops the power supply operation to the device 4 outside the vehicle and lights the lamp 3d to notify the user of the occurrence of the abnormality information.

  As described above, in the present embodiment, when the power supply device 3 receives the message 1 including the discharge permission of the stored power, the discharge stop, and the abnormality information among the messages received by the CAN communication, the power supply is performed. Since the power supply operation from the device 3 to the device 4 outside the vehicle is stopped, for example, the electronic control device 2 stops the discharge from the vehicle-mounted battery when the vehicle-mounted battery 1 is in an overvoltage state with respect to the power supply device 3. When the message 1 is transmitted while the message 1 is interrupted, the power supply operation to the device 4 outside the vehicle can be stopped in response to the discharge stop. On the other hand, since the power supply operation to the device 4 outside the vehicle can be continued even if the reception of the other message 2 is interrupted, the user can replace the commercial power supply to the house, for example, due to a power failure. In addition, the stored power of the on-vehicle battery 1 of the electric vehicle can be used as a power source for the device 4 outside the vehicle.

DESCRIPTION OF SYMBOLS 1 In-vehicle battery 2 Electronic controller 3 Power supply device 4 Equipment outside the vehicle

Claims (6)

A vehicle-side battery on the vehicle side, an electronic control device that controls at least a discharge operation from the vehicle-mounted battery, and a power supply device that converts the stored power of the vehicle-mounted battery and supplies it to a device outside the vehicle as its power source, The electronic control device and the power supply device transmit and receive messages by packet communication between them, and by this transmission and reception, the power supply device performs power supply operation to the equipment outside the vehicle and stops the supply operation. In the system,
The power supply device, when receiving a message (message 1) including at least discharge permission and discharge stop for the in-vehicle battery among a plurality of messages transmitted and received by packet communication with the electronic control device, A power supply system characterized in that the power supply operation to the device outside the vehicle is stopped, and the power supply operation to the device outside the vehicle is continued even if reception of other messages (message 2) is interrupted.   2. The power supply system according to claim 1, wherein the power supply device stops the power supply operation to the device outside the vehicle when the message 1 cannot be received within a predetermined time.   The power supply device used in the power supply system according to claim 1 or 2, wherein when the message 1 is interrupted, the power supply operation to the device outside the vehicle is stopped, and the message 2 is received. A power supply device that continues the power supply operation to the equipment outside the vehicle even if it is interrupted. A CPU that controls the entire power supply device, a communication interface that is controlled by the CPU and packet-communication with the electronic control device, and a converter that is controlled by the CPU and converts the stored power;
The CPU converts the stored electric power of the in-vehicle battery by controlling the converter, supplies it as a power source to the equipment outside the vehicle, and performs packet communication with the electronic control unit via the communication interface. If the message 1 is not included in the message received by the packet communication, the conversion operation of the converter is stopped, the power supply operation to the device outside the vehicle is stopped, and the message received by the packet communication is The power supply device according to claim 3, wherein if the message 1 is included, the conversion operation of the converter is not stopped and the power supply operation to the device outside the vehicle is continued.   The power supply apparatus according to claim 4, further comprising a display lamp that is turned on by the CPU, wherein the CPU controls lighting of the display lamp when the message 1 is received.   The power supply apparatus according to claim 1, wherein the packet communication is CAN communication.

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