JP2014057389A - Power supply system - Google Patents

Abstract

An object of the present invention is to ensure desired power supply efficiency while preventing the configuration of an external power supply apparatus from becoming complicated.
An ECU 61 estimates an appropriate voltage of an external power supply device 12 connected between terminals on a primary side of a power drive unit 26 of a fuel cell vehicle 11 or receives a signal output from the external power supply device 12. get. The ECU 61 determines that the output voltages of the first voltage regulator 23 and the second voltage regulator 24, that is, the voltage (PDU voltage) VP on the primary side of the power drive unit 26 detected by the PDU voltage sensor 79 is the external power supply device 12. The operation of the first voltage regulator 23 and the second voltage regulator 24 is controlled so as to match the appropriate voltage.
[Selection] Figure 1

Description

  The present invention relates to a power feeding system.

  Conventionally, for example, a stationary power supply system including a second DC-DC converter and an inverter can be attached to and detached from a fuel cell vehicle including a fuel cell, a storage battery, and a first DC-DC converter. There is known a power supply system that supplies power from the output terminal on the power storage device side of the first DC-DC converter disposed between the inverter and the inverter via the second DC-DC converter (for example, Patent Document 1).

JP 2006-325392 A

By the way, according to the power supply system according to the related art, the voltage applied to the inverter of the stationary power supply system is controlled by the second DC-DC converter, and the stationary power supply is provided by including the second DC-DC converter. There arises a problem that the system configuration becomes complicated.
Furthermore, as a whole of the power supply system, the voltage conversion operation is performed by the two first and second DC-DC converters, so that the energy loss accompanying the voltage conversion increases and the efficiency of power supply decreases. Problems arise.

Further, in the power supply system according to the above-described prior art, the second DC-DC converter can be omitted. In this case, the output voltage of the storage battery of the fuel cell vehicle is applied to the inverter of the stationary power supply system. Only.
Thereby, for example, when the output voltage of the storage battery deviates from the operable voltage range of the inverter according to the state of the fuel cell vehicle, etc., the proper operation of the inverter becomes difficult, or the operating efficiency of the inverter May be significantly reduced.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power feeding system capable of ensuring desired power feeding efficiency while preventing the configuration of an external power feeding apparatus from becoming complicated.

  In order to solve the above problems and achieve the object, a power feeding system according to a first invention of the present invention is an electric vehicle (for example, the fuel cell vehicle 11 in the embodiment) and can be attached to and detached from the electric vehicle. An external power supply device (for example, external power supply device 12 in the embodiment), wherein the electric vehicle includes a first power source (for example, battery 22 in the embodiment) and a second power source. (For example, the fuel cell stack 21 in the embodiment) and a travel motor driven by the power of the first power source and the second power source connected in parallel (for example, the travel motor 25 in the embodiment) And a voltage converter (for example, the first voltage regulator (BATVCU) 23 in the embodiment) capable of converting and outputting the voltage of the first power supply, and an appropriate voltage for obtaining an appropriate voltage of the external power supply device Acquisition means ( For example, the ECU 61) in the embodiment and a control means (for example, the ECU 61 in the embodiment), the external power supply device can be connected to the output side of the voltage converter, and the control means Controls the voltage conversion of the voltage converter such that the output voltage of the voltage converter matches the appropriate voltage acquired by the appropriate voltage acquisition means.

  Furthermore, the power supply system according to the second aspect of the present invention is an external power supply contactor capable of switching between connection and disconnection between the electric vehicle and the external power supply device (for example, the external power supply contactor portion 35 in the embodiment). Request acquisition means (for example, ECU 61 in the embodiment) for acquiring a power supply start request for the external power supply apparatus, and input voltage acquisition means (for example, in the embodiment) for acquiring the input voltage of the external power supply apparatus An inverter voltage sensor 84), and when the power supply start request is acquired by the request acquisition means, the control means stops the power supply of the second power supply in a disconnected state of the external power supply contactor. The voltage conversion of the voltage converter such that the difference between the output voltage of the voltage converter and the input voltage acquired by the input voltage acquisition means is within a predetermined difference. After control, the external power supply contactor connected.

  Furthermore, a power supply system according to a third aspect of the present invention includes a second voltage converter (for example, the second voltage regulator 24 in the embodiment) that can convert and output the voltage of the second power source. The external power supply device is connectable between an output side of the voltage converter and an output side of the second voltage converter, and the control means includes the voltage converter and the second voltage. The voltage conversion of the voltage converter and the second voltage converter is controlled so that the output voltage of the converter matches the appropriate voltage.

According to the power supply system of the first aspect of the present invention, the voltage of the first power supply is converted by the voltage conversion device, so that the output voltage of the voltage conversion device applied to the external power supply device is changed to the appropriate value of the external power supply device. Can match the voltage. Thereby, it is possible to prevent the configuration of the external power supply apparatus from becoming complicated, and it is possible to easily ensure the desired power supply efficiency and power supply possible time of the external power supply apparatus.
Furthermore, the driving of the electric vehicle is driven by voltage conversion of the voltage converter by matching the position where the external power feeding device is connected with the position where the driving motor is connected to the first power source and the second power source. Power supply in a wide voltage range from power supply to the external power supply device can be performed, and the versatility of power supply can be improved.

According to the power supply system of the second invention of the present invention, for example, even when a power supply start request is suddenly acquired in the power supply execution state of the first power supply and the second power supply, A precharge operation for setting the difference between the output voltage and the input voltage of the external power supply device within a predetermined difference can be appropriately performed by voltage conversion of the voltage conversion device.
Thus, for example, it is possible to prevent the occurrence of inrush current without the need to provide a dedicated circuit for performing only the precharge operation, and it is possible to prevent the configuration of the power feeding system from becoming complicated.

  According to the power feeding system of the third aspect of the present invention, the voltage applied to the traveling motor and the external power feeding device can be controlled in more detail and easily.

It is a lineblock diagram of an electric supply system concerning an embodiment of the invention. It is a flowchart which shows operation | movement of the electric power feeding system which concerns on embodiment of this invention. It is a figure which shows an example of the change of the motor required voltage at the time of driving | running | working of the electric power feeding system which concerns on embodiment of this invention, and external electric power feeding, the inverter appropriate voltage, and the target value and actual value of PDU voltage. It is a flowchart which shows operation | movement of the electric power feeding system which concerns on embodiment of this invention. FC voltage, PDU voltage, inverter voltage, voltage difference, command value (first output voltage) for output voltage of first voltage regulator, external power supply contactor unit and FC contactor unit of power supply system according to the embodiment of the present invention It is a figure which shows an example of a change with. Changes in the PDU voltage, inverter voltage, voltage difference, command value (first output voltage) for the output voltage of the first voltage regulator, and the external power supply contactor unit and FC contactor unit of the power supply system according to the embodiment of the present invention It is a figure which shows an example. It is a flowchart which shows operation | movement of the electric power feeding system which concerns on the modification of embodiment of this invention. An example of changes in the PDU voltage, inverter voltage, voltage difference, command value (first output voltage) with respect to the output voltage of the first voltage regulator, and the external power supply contactor portion of the power feeding system according to the modification of the embodiment of the present invention FIG.

  Hereinafter, a power supply system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  For example, as shown in FIG. 1, a power feeding system 10 according to the present embodiment includes a fuel cell vehicle 11 and an external power feeding device 12 provided separately from the fuel cell vehicle 11. Power is supplied to an external load 13 such as an AC device.

The fuel cell vehicle 11 includes, for example, a power feeding port 11a connected to the power source of the fuel cell vehicle 11 in the trunk room at the rear of the vehicle, and the external power feeding device 12 can be mounted in the trunk room.
The external power supply device 12 includes, for example, a power supply connector 12 a that is detachably fitted to a power supply port 11 a provided in the fuel cell vehicle 11.
The power supply connector 12a includes, for example, a plurality of connector pins that can be electrically connected to a plurality of terminals provided in the power supply port 11a.

  In the fuel cell vehicle 11 and the external power supply device 12, the power supply connector 12a of the external power supply device 12 is fitted into the power supply port 11a of the fuel cell vehicle 11, and the power supply connector is connected to a plurality of terminals of the power supply port 11a along with this fitting. Electrical connection is established by connecting a plurality of connector pins 12a.

  The external power supply device 12 includes, for example, a power output unit 12b that can be electrically connected to the external load 13, and converts the DC power of the fuel cell vehicle 11 input from the power supply connector 12a into AC power. The converted AC power can be supplied to the external load 13 from the power output unit 12b.

  The fuel cell vehicle 11 includes, for example, a fuel cell stack 21, a battery 22, a first voltage regulator (BATVCU) 23, a second voltage regulator (FCVCU) 24, a travel motor 25, and a power drive unit (PDU). ) 26, air pump 27, air pump inverter (APINV) 28, downverter (DV) 29, 12V battery 30, battery precharge unit 31 and battery contactor unit 32, FC precharge unit 33 and FC contactor Unit 34, an external power supply contactor unit 35, and a control device 36.

  The fuel cell stack 21 includes, for example, a solid polymer electrolyte membrane composed of a cation exchange membrane, a fuel electrode (anode) composed of an anode catalyst and a gas diffusion layer, and an oxygen electrode (cathode) composed of a cathode catalyst and a gas diffusion layer. And an electrolyte electrode structure sandwiched between a plurality of fuel cell units sandwiched between a pair of separators. And the laminated body of the fuel cell is pinched | interposed from the both sides of the lamination direction by a pair of end plate.

Air, which is an oxidant gas (reaction gas) containing oxygen, can be supplied from the air pump 27 to the cathode of the fuel cell stack 21, and a fuel tank (reaction gas) containing hydrogen is a high-pressure hydrogen tank (not shown) to the anode. ) Or the like.
Then, during the supply of the reaction gas, hydrogen ionized by the catalytic reaction on the anode catalyst of the anode moves to the cathode through the moderately humidified solid polymer electrolyte membrane, and the electrons generated along with this movement Is taken out to an external circuit to generate DC power. At this time, at the cathode, hydrogen ions, electrons and oxygen react to produce water.

  The battery 22 is, for example, a high-voltage lithium ion type secondary battery, and is connected to the fuel cell stack 21 via a first voltage regulator 23 and a second voltage regulator 24.

The first voltage regulator (BATVCU) 23 includes, for example, a DC-DC converter,
The voltage between the terminals of the battery 22 (battery voltage) VB can be converted and output, and voltage adjustment is performed for power transfer between the fuel cell stack 21 and the battery 22.
The first voltage regulator 23 includes, for example, a smoothing capacitor 23a on the fuel cell stack 21 side.

The second voltage regulator (FCVCU) 24 includes, for example, a DC-DC converter,
The voltage between the terminals (FC voltage) VF of the fuel cell stack 21 can be converted and output, and voltage adjustment is performed for power transfer between the fuel cell stack 21 and the battery 22.
Note that the second voltage regulator 24 includes, for example, a smoothing capacitor 24a on the battery 22 side.

The traveling motor 25 is, for example, a U-phase, V-phase, and W-phase three-phase DC brushless motor, and is capable of powering operation and power generation operation according to control by the power drive unit 26.
For example, the traveling motor 25 performs a power running operation by applying an alternating phase current to the coils of each phase, and drives the drive wheels W via the transmission (T / M) 25a. Further, when the fuel cell vehicle 11 is decelerated, a driving force is transmitted from the driving wheel side to perform a power generation operation (regenerative operation) and output generated power (regenerative power).

  The power drive unit 26 includes, for example, a bridge circuit formed by bridge connection using a plurality of switching elements such as transistors, and an inverter by pulse width modulation (PWM) including a smoothing capacitor.

  This inverter switches on (off) / off (off) each switching element that makes a pair for each phase based on the PWM signal output from the control device 36, for example, during power running operation of the traveling motor 25. As a result, the DC power supplied from the battery 22 via the first voltage regulator 23 or the DC power supplied from the fuel cell stack 21 via the second voltage regulator 24 is converted into three-phase AC power for running. By sequentially commutating energization to the coils of each phase of the motor 25 for electric current, alternating currents of each phase are energized.

  On the other hand, for example, during the power generation operation of the traveling motor 25, the inverter turns each switching element on (conductive) / off (cut off) in accordance with the gate signal synchronized based on the rotation angle of the rotor of the traveling motor 25. The AC generated power output from the traveling motor 25 is converted into DC power.

  The air pump 27 is, for example, an electric compressor including a pump drive motor (not shown) that is rotationally driven by AC power output from the air pump inverter 28, and takes in air from the outside and compresses the compressed air. To the cathode of the fuel cell stack 21 as a reaction gas.

  The air pump inverter 28 is, for example, a PWM inverter by pulse width modulation (PWM) or the like, and based on a control signal output from the control device 36, DC power supplied from the battery 22 via the first voltage regulator 23. Alternatively, DC power supplied from the fuel cell stack 21 via the second voltage regulator 24 is converted into AC power. Then, the pump driving motor of the air pump 27 is rotationally driven by the converted AC power, and the rotational speed of the pump driving motor is controlled.

  The downverter 29 includes, for example, a DC-DC converter or the like, and converts a high voltage between the terminals of the battery 22 or a high voltage applied from the fuel cell stack 21 via the first voltage regulator 23 to a predetermined low voltage ( 12V), and the 12V battery 30 is charged with the predetermined voltage power after the step-down.

  The 12V battery 30 outputs, for example, low-voltage predetermined voltage power for driving an electric load including the control device 36 and various auxiliary machines.

The battery precharge unit 31 and the battery contactor unit 32 are provided between the battery 22, the first voltage regulator 23, and the downverter 29, for example.
The battery precharge unit 31 includes, for example, a precharge contactor 41 and a precharge resistor 42 connected in series.

The battery contactor 32 includes, for example, a positive battery contactor 43 connected to the positive terminal of the battery 22 in the high voltage line (HV +) on the positive electrode side of the fuel cell vehicle 11 and a battery 22 in the high voltage line (HV−) on the negative electrode side. And a negative electrode side battery contactor 44 connected to the negative electrode terminal.
The battery precharge unit 31 is connected to both ends of the positive battery contactor 43 (that is, in parallel to the positive battery contactor 43).

The FC precharge unit 33 and the FC contactor unit 34 are provided between the fuel cell stack 21 and the second voltage regulator 24, for example.
The FC precharge unit 33 includes, for example, a precharge contactor 45 and a precharge resistor 46 connected in series.

The FC contactor unit 34 includes, for example, a positive side FC contactor 47 connected to the positive terminal of the fuel cell stack 21 in the positive side high voltage line (HV +) of the fuel cell vehicle 11 and a negative side high voltage line (HV−). The negative electrode side FC contactor 48 connected to the negative electrode terminal of the fuel cell stack 21.
The FC precharge unit 33 is connected to both ends of the positive-side FC contactor 47 (that is, in parallel to the positive-side FC contactor 47).

The external power supply contactor unit 35 is provided between, for example, the first voltage regulator 23, the second voltage regulator 24, the power drive unit 26, and the power supply port 11a.
The external power supply contactor unit 35 includes, for example, a positive electrode side external power supply contactor 51 provided in the high voltage line (HV +) on the positive electrode side of the fuel cell vehicle 11 and a negative electrode side external provided in the high voltage line (HV−) on the negative electrode side. And a power supply contactor 52.

  And each contactor 41,43,44,45,47,48,51,52 can switch conduction | electrical_connection and interruption | blocking based on the control signal output from the control apparatus 36, for example.

  The control device 36 includes, for example, an ECU (Electronic Control Unit) 61 configured by an electronic circuit such as a CPU (Central Processing Unit).

The ECU 61 controls the power running operation and the power generation operation of the travel motor 25 by controlling the power conversion operation of the power drive unit 26, for example.
For example, the ECU 61 calculates a target torque of the traveling motor 25 based on signals output from various sensors, switches, and the like so that the torque actually output from the traveling motor 25 matches the target torque. The feedback control for the current supplied to the traveling motor 25 is executed.

  For example, the ECU 61 controls the power conversion operation of the air pump inverter 28, the opening and closing of various valves provided in the reaction gas flow path, the voltage adjustment operation of the first voltage regulator 23, and the like to the fuel cell stack 21. The reaction gas supply and the power generation amount (generated power) of the fuel cell stack 21 are controlled.

  The ECU 61 controls, for example, monitoring and protection of the high-voltage equipment system including the battery 22 based on, for example, signals output from various sensors and switches, and further, a signal output from the inverter control device 82.

  For example, the ECU 61 uses the fuel cell vehicle 11 based on command signals such as an ignition switch 71 and a power switch 72 and detection signals such as a speed sensor 73, an accelerator pedal opening sensor 74, and a brake pedal switch (not shown). Control the operating state of

The ignition switch 71 outputs a command signal (IGSW) instructing start and stop of the fuel cell vehicle 11 according to the operation of the driver.
Further, the power switch 72 outputs a command signal (PSW) instructing activation of the fuel cell stack 21 (for example, activation of the air pump 27, etc.) according to the operation of the driver.

The speed sensor 73 detects the speed of the fuel cell vehicle 11.
The accelerator pedal opening sensor 74 detects the stroke amount (accelerator opening) of the accelerator pedal according to the depression of the accelerator pedal by the driver.
The brake pedal switch detects whether the driver has operated the brake pedal.

Further, for example, the ECU 61 detects each detection signal of the battery voltage sensor 75 that detects the voltage (battery voltage) VB between the terminals of the battery 22, the battery current sensor 76 that detects the current IB, and the battery temperature sensor 77 that detects the temperature TB. Based on this, various state quantities such as remaining capacity SOC (State Of Charge) are calculated.
Then, based on the calculated various state quantities, the battery precharge unit 31 and the battery contactor unit 32 are controlled to be turned on and off, thereby controlling the charging and discharging of the battery 22.

  Further, for example, the ECU 61 detects an inter-terminal voltage (FC voltage) VF of the fuel cell stack 21 and an PDU voltage sensor that detects a primary inter-terminal voltage (PDU voltage) VP of the power drive unit 26. Based on the detection signals 79 and the like, the state of the fuel cell stack 21 and the connection state between the fuel cell vehicle 11 and the external power supply device 12 are controlled.

Further, the ECU 61 controls the power feeding to the external power feeding device 12 connected to the fuel cell vehicle 11 and the power conversion operation of the external power feeding device 12, and detects whether the external power feeding device 12 is abnormal.
For example, the ECU 61 controls the connection state between the fuel cell vehicle 11 and the external power supply device 12 and the power supply to the external power supply device 12 by controlling the conduction and disconnection of the external power supply contactor unit 35.

  Note that the ECU 61 is connected to a meter 80 including various sensors, switches, and the like that display various states of the fuel cell vehicle 11.

  The external power supply device 12 includes, for example, at least one inverter 81 and an inverter control device 82.

The inverter 81 includes, for example, a bridge circuit formed by a bridge connection using a plurality of switching elements such as transistors and a smoothing capacitor. Based on a switching command signal output from the inverter control device 82, each switching element is turned on (conducted). ) / Off (blocking). Thus, direct current supplied from the power source of the fuel cell vehicle 11 (for example, the fuel cell stack 21 and the battery 22) via the power supply connector 12a fitted to the power supply port 11a provided in the fuel cell vehicle 11. The power can be converted into AC power, and the converted AC power can be supplied to the external load 13.
The inverter 81 is connected to the external power supply contactor unit 35 through, for example, a smoothing capacitor 81a.
Furthermore, the inverter 81 includes a voltage variable changeover switch 81b that can be operated by, for example, an operator's manual operation and can switch the output voltage to a plurality of different values (for example, 100V and 200V). .

  The inverter control device 82 is operated by, for example, control power supplied from the ECU 61 of the fuel cell vehicle 11, and in response to various command signals output from the ECU 61, the inverter 81 and the power supply connector 12 a electromagnetically. The power supply to the external load 13 is controlled by controlling the operation of the lock 83.

The input terminal on the positive electrode side and the negative electrode side of the inverter 81 is connected to the power supply port 11a of the fuel cell vehicle 11 by the power supply connector 12a of the external power supply device 12, and the fuel cell vehicle via the electromagnetic lock 83. 11 can be connected to the high voltage lines (HV +) and (HV−) on the positive electrode side and the negative electrode side.
The electromagnetic lock 83 is controlled between the input terminal on the positive electrode side and the negative electrode side of the inverter 81 and the high voltage lines (HV +) and (HV−) on the positive electrode side and the negative electrode side of the fuel cell vehicle 11 under the control of the inverter control device 82. Switch between electrical connection and disconnection.

  Further, the inverter control device 82 outputs a signal of information relating to the state of the external power supply device 12 based on, for example, a detection signal of the inverter voltage sensor 84 that detects an input voltage (inverter voltage VI) of the inverter 81.

For example, the inverter control device 82 is connected to each connector pin provided in the power supply connector 12a.
The power supply port 11a of the fuel cell vehicle 11 includes terminals connected to the connector pins of the power supply connector 12a, and the ECU 61 of the control device 36 is connected to the terminals of the power supply port 11a through appropriate signal lines. Yes.
As a result, the ECU 61 of the fuel cell vehicle 11 and the inverter control device 82 are fitted with the power feed connector 12a of the external power feed device 12 in the power feed port 11a of the fuel cell vehicle 11, and with this fitting, the power feed port 11a In a state where the plurality of connector pins of the power feeding connector 12a are connected to the plurality of terminals, various signals can be transmitted / received to / from each other.

  In addition, the signal transmitted / received between ECU61 of the fuel cell vehicle 11 and the inverter control apparatus 82 is, for example, a signal instructing a power output request (power supply start request) from the external power supply apparatus 12 to the external load 13; A signal for instructing permission to output power from the external power feeding device 12 to the external load 13, a signal for instructing permission and prohibition of power feeding from the fuel cell vehicle 11 to the external power feeding device 12, a power feeding port 11a and a power feeding connector 12a A signal indicating the presence / absence of the fitting, a voltage signal for control supplied from the ECU 61 to the inverter control device 82, a signal indicating the detection result of the inverter voltage (detected value) VI detected by the inverter voltage sensor 84, and an external And a signal indicating an appropriate voltage required by the power supply device 12.

The appropriate voltage required by the external power supply device 12 is, for example, an input voltage required for the efficiency of the voltage conversion operation for outputting a predetermined output voltage from the external power supply device 12 to the external load 13 to be a predetermined value or more. It is.
The ECU 61 of the fuel cell vehicle 11 is, for example, a voltage variable changeover switch 81b of the inverter 81 in response to a signal output from the external power supply device 12 when the power supply port 11a and the power supply connector 12a are fitted or an operation input by the operator. The appropriate voltage of the external power supply device 12 is grasped based on the signal output from.

  The power feeding system 10 according to the present embodiment has the above-described configuration. Next, the operation of the power feeding system 10, particularly the operation of the ECU 61 will be described.

The ECU 61 acquires, for example, an appropriate voltage of the external power supply apparatus 12 connected to the fuel cell vehicle 11 by estimation or reception of a signal output from the external power supply apparatus 12. The output voltages of the first voltage regulator 23 and the second voltage regulator 24, that is, the voltage (PDU voltage) VP on the primary side of the power drive unit 26 detected by the PDU voltage sensor 79 is The operation of the first voltage regulator 23 and the second voltage regulator 24 is controlled so as to match the appropriate voltage.
When controlling the operations of the first voltage regulator 23 and the second voltage regulator 24, the ECU 61 controls the voltage conversion of both the first voltage regulator 23 and the second voltage regulator 24, for example. May be. Alternatively, for example, one of the ECUs 61 (for example, the second voltage regulator (FCVCU) 24) is in a cut-off state or a direct connection state (that is, a state in which voltage is not converted), and the other (for example, the first voltage regulator (FCVCU) 24). The voltage conversion of one voltage regulator (BATVCU) 23 or the like may be controlled.

Below, an example of operation | movement of ECU61 is demonstrated.
First, for example, in step S01 shown in FIG. 2, it is determined whether or not execution of external power supply is instructed by a power output request (power supply start request) from the external power supply device 12 to the external load 13.
If this determination is “NO”, the flow proceeds to step S 02.
On the other hand, if this determination is “YES”, the flow proceeds to step S 03 described later.
In step S02, it is determined that the fuel cell vehicle 11 is in an operating state by driving the driving motor 25, and the PDU voltage VP corresponding to the required power required for driving the driving motor 25 is set. Set the target value. Then, the voltage conversion of the first voltage regulator 23 and the second voltage regulator 24 is controlled so that the output voltages of the first voltage regulator 23 and the second voltage regulator 24 coincide with the target value of the PDU voltage VP. And go to the end.

In step S03, an appropriate voltage required by the external power supply device 12 is acquired.
Next, in step S04, the output voltage of the first voltage regulator 23 and the second voltage regulator 24, that is, the PDU voltage VP matches the appropriate voltage of the external power supply device 12, and the first voltage regulator 23 is set. And the voltage conversion of the 2nd voltage regulator 24 is controlled, and it progresses to an end.

  For example, as shown in FIG. 3A, when the fuel cell vehicle 11 is driven by driving the driving motor 25, the external power supply contactor portion 35 is maintained in the cut-off state (OFF), and the power supplied to the external load 13 is maintained. (External load power) is maintained at zero. The output voltage of the first voltage regulator 23 and the second voltage regulator 24, that is, the PDU voltage VP is a required voltage (motor required voltage) corresponding to required power (motor required power) required for driving the traveling motor 25 and the like. It changes according to the change of.

  For example, when the motor required power and the motor required voltage change toward the predetermined values Pa and Va after time t1 shown in FIG. 3A, the increase tends toward the predetermined value VPa so as to follow this change. The target value of the PDU voltage VP that changes to is set. Then, by controlling the voltage conversion of the first voltage regulator 23 and the second voltage regulator 24 so that the actual PDU voltage VP matches the target value, for example, after an appropriate time has elapsed from time t1. After time t2, the actual value of the PDU voltage VP changes in an increasing trend.

  For example, as shown in FIG. 3B, when external power feeding is instructed by an output request (power feeding start request) of power from the external power feeding device 12 to the external load 13, external power feeding is performed. The contactor unit 35 is maintained in the connected state (ON), and the required motor power is maintained at zero. The PDU voltage VP changes according to a change in the appropriate voltage (inverter appropriate voltage) of the external power supply device 12 according to the power supplied to the external load 13 (external load power).

  For example, after the time t1 shown in FIG. 3B, when the external load power and the inverter appropriate voltage change from zero to the predetermined values Pb and Vb in a stepped manner, the change from zero to a stepped manner follows this change. A target value of PDU voltage VP that changes to predetermined value VPb is set. Then, the voltage conversion of the first voltage regulator 23 and the second voltage regulator 24 is controlled so that the actual PDU voltage VP coincides with the target value, so that, for example, the actual value of the PDU voltage VP is changed from the time t1. It gradually increases and reaches a predetermined value VPb at an appropriate time t2.

  Further, when a signal instructing an output request (power supply start request) of power from the external power supply device 12 to the external load 13 is received, the fuel cell stack 21 and the second voltage adjustment are performed with the external power supply contactor unit 35 disconnected. The power supply from the device 24 is stopped. Then, the first voltage regulator is set such that the difference between the output voltage of the first voltage regulator 23 (that is, the PDU voltage VP) and the input voltage (inverter voltage) VI detected by the inverter voltage sensor 84 is within a predetermined value. After controlling the voltage conversion of 23, the external power supply contactor unit 35 is brought into a connected state.

Below, an example of operation | movement of ECU61 which acquired the electric power feeding start request | requirement is demonstrated.
First, for example, in step S11 shown in FIG. 4, it is determined whether or not the external power supply contactor unit 35 is in a connected state (ON).
If this determination is “NO”, the flow proceeds to step S 12.
On the other hand, if this determination is “YES”, the flow proceeds to step S 18 described later.

In step S12, a voltage difference ΔV between the PDU voltage VP and the inverter voltage VI is calculated.
Next, in step S13, it is determined whether or not the absolute value of the voltage difference ΔV is equal to or smaller than a predetermined voltage difference.
If the determination result is “YES”, the process proceeds to step S14. In step S14, the external power supply contactor unit 35 is switched from the cut-off state (OFF) to the connected state (ON), and the process proceeds to return.
On the other hand, if this determination is “NO”, the flow proceeds to step S15.

In step S15, it is determined whether or not the terminal voltage (FC voltage) VF of the fuel cell stack 21 is greater than a predetermined voltage, and the FC contactor 34 is in the connected state (ON).
If this determination is “NO”, the flow proceeds to step S 16, in which the inverter voltage VI is set as the command value (first output voltage) for the output voltage of the first voltage regulator 23, and The voltage conversion of the first voltage regulator 23 is controlled so that the output voltage of the 1 voltage regulator 23 matches the inverter voltage VI, and the process proceeds to return.
On the other hand, if this determination is “YES”, the flow proceeds to step S 17 described later, and in this step S 17, the FC contactor unit 34 is switched from the connected state (ON) to the disconnected state (OFF), or the fuel cell. The supply of the reaction gas to the stack 21 is stopped, and the process proceeds to return.

In step S18, it is determined whether or not the supply of the reaction gas to the fuel cell stack 21 is stopped.
If this determination is “NO”, the flow proceeds to step S 20 described later.
On the other hand, if this determination is “YES”, the flow proceeds to step S 19, and in this step S 19, the supply of the reaction gas to the fuel cell stack 21 is started (that is, resumed).

In step S20, it is determined whether or not the FC contactor unit 34 is in the cut-off state (OFF).
If this determination is “NO”, the flow proceeds to return.
On the other hand, if the determination is “YES”, the flow proceeds to step S21.

Next, in step S21, the FC voltage VF is set to the command value (first output voltage) for the output voltage of the first voltage regulator 23, and the output voltage of the first voltage regulator 23 matches the FC voltage VF. In this way, the voltage conversion of the first voltage regulator 23 is controlled.
Next, in step S22, a voltage difference ΔVfc between the PDU voltage VP and the FC voltage VF is calculated.
Next, in step S23, it is determined whether or not the absolute value of the voltage difference ΔVfc is equal to or smaller than a predetermined voltage difference.
If this determination is “NO”, the flow proceeds to return.
On the other hand, if this determination is “YES”, the flow proceeds to step S 24, and in this step S 24, the FC contactor unit 34 is switched from the cutoff state (OFF) to the connected state (ON), and the flow proceeds to return.

For example, when the ECU 61 obtains the power supply start request at time t0 shown in FIG. 5, the FC contactor unit 34 is switched from the connected state (ON) to the cut-off state (OFF) as shown at time t1, and the fuel cell stack 21 The power generation stop is instructed, and the supply of the reaction gas to the fuel cell stack 21 is stopped. Accordingly, the FC voltage VF is maintained at a constant value.
For example, the time t0 shown in FIG. 5 is caused by the direct connection state of the second voltage regulator (FCVCU) 24 in the connected state (ON) of the FC contactor unit 34 and the disconnected state (OFF) of the external power supply contactor unit 35. Thus, the PDU voltage VP is the same as the FC voltage VF and the PDU voltage VP exceeds the predetermined voltage difference and is higher than the inverter voltage VI.

Then, for example, as shown at time t2, the ECU 61 sets the inverter voltage VI to the command value (first output voltage) for the output voltage of the first voltage regulator 23, and the output voltage of the first voltage regulator 23 is the inverter. The voltage conversion of the first voltage regulator 23 is controlled so as to coincide with the voltage VI.
In the embodiment shown in FIG. 5, the command value (first output voltage) for the output voltage of the first voltage regulator 23 before time t2 is set to an appropriate initial value V0, for example.

  For example, as shown at time t <b> 3, when the voltage difference ΔV between the PDU voltage VP and the inverter voltage VI reaches a predetermined voltage difference or less, the ECU 61 changes the external power supply contactor unit 35 from the disconnected state (OFF) to the connected state (ON ). Accordingly, the voltage difference ΔV converges toward zero, and the PDU voltage VP and the inverter voltage VI become the same, for example, as shown at time t4.

  For example, as shown at time t5, the ECU 61 restarts the supply of the reaction gas to the fuel cell stack 21, and sets the FC voltage VF to the command value (first output voltage) for the output voltage of the first voltage regulator 23. The voltage conversion of the first voltage regulator 23 is controlled so that the output voltage of the first voltage regulator 23 matches the FC voltage VF.

  For example, as shown at time t6, when the voltage difference ΔVfc between the PDU voltage VP and the FC voltage VF reaches a predetermined voltage difference or less, the ECU 61 changes the FC contactor unit 34 from the disconnected state (OFF) to the connected state (ON). And the power generation of the fuel cell stack 21 is instructed. Accordingly, the voltage difference ΔVfc converges toward zero, and the PDU voltage VP, the inverter voltage VI, and the FC voltage VF become the same, for example, as shown at time t7.

  In the embodiment shown in FIG. 5, after time t7, for example, the FC voltage VF is maintained as a command value (first output voltage) for the output voltage of the first voltage regulator 23, or after time t8, for example. As shown, an appropriate voltage value is set according to the request of the external power supply device 12.

Further, when the ECU 61 obtains a power supply start request at time t0 shown in FIG. 6, for example, as shown at time t1, the FC contactor unit 34 is switched from the connected state (ON) to the cut-off state (OFF), and the fuel cell stack 21 is instructed to stop power generation, and the supply of the reaction gas to the fuel cell stack 21 is stopped.
For example, at time t0 shown in FIG. 6, the inverter voltage VI exceeds a predetermined voltage difference and exceeds the PDU voltage VP in the connected state (ON) of the FC contactor unit 34 and the disconnected state (OFF) of the external power supply contactor unit 35. It is in a big state.

The ECU 61 sets the inverter voltage VI to the command value (first output voltage) for the output voltage of the first voltage regulator 23 so that the output voltage of the first voltage regulator 23 matches the inverter voltage VI. The voltage conversion of the first voltage regulator 23 is controlled.
In the embodiment shown in FIG. 6, the command value (first output voltage) for the output voltage of the first voltage regulator 23 before time t1 is, for example, an appropriate initial value V0.

  For example, as shown at time t2, when the voltage difference ΔV between the PDU voltage VP and the inverter voltage VI reaches a predetermined voltage difference or less, the ECU 61 changes the external power supply contactor unit 35 from the disconnected state (OFF) to the connected state (ON). ). Accordingly, the voltage difference ΔV converges toward zero, and the PDU voltage VP and the inverter voltage VI become the same, for example, as shown at time t3.

  In the embodiment shown in FIG. 6, after time t3, for example, a constant inverter voltage VI is maintained as the command value (first output voltage) for the output voltage of the first voltage regulator 23, for example, at time As shown after t4, an appropriate voltage value or an appropriate initial value V0 according to the request of the external power supply device 12 is set.

As described above, according to the power feeding system 10 according to the present embodiment, the output voltage of the first voltage regulator 23 and the second voltage regulator 24 (that is, the PDU voltage VP) is used as the appropriate voltage of the external power feeder 12 during external power feeding. Can match. Thereby, compared with the case where the external electric power feeder 12 is provided with the structure for voltage adjustment, for example, the structure of the external electric power feeder 12 can be prevented from becoming complicated, and the external electric power feeder 12 can be reduced in size.
In addition, since the external power supply device 12 is connected between the terminals on the primary side of the power drive unit 26, the voltage applied to the external power supply device 12 can be easily converted by the voltage conversion of the first voltage regulator 23 and the second voltage regulator 24. Can be controlled. Furthermore, by the voltage conversion of the first voltage regulator 23 and the second voltage regulator 24, it is possible to easily perform power supply in a wide voltage range from the driving driving of the fuel cell vehicle 11 to the power feeding to the external power feeding device 12. And versatility of power supply can be improved.

Further, before the external power supply contactor unit 35 is switched from the cut-off state to the connected state at the start of the external power supply execution, the supply of power from the fuel cell stack 21 and the second voltage regulator 24 and the first voltage regulator are stopped. By the voltage conversion of 23, a precharge operation for setting the voltage difference between the PDU voltage VP and the inverter voltage VI within a predetermined voltage difference can be appropriately executed.
As a result, for example, suddenly a power supply start request is made in a connection state of the battery contactor unit 32 and the FC contactor unit 34 (that is, a state in which power can be supplied from the battery 22 and the fuel cell stack 21 to the primary terminal of the power drive unit 26). Even when the current is acquired, it is possible to prevent the occurrence of an inrush current. Furthermore, for example, the precharge operation can be appropriately executed without the need for providing a dedicated circuit for performing the precharge operation, and the system configuration can be prevented from becoming complicated.

In the above-described embodiment, the external power supply device 12 includes the inverter 81, and the DC power of the fuel cell vehicle 11 is converted into AC power and supplied to the external load 13 that is an AC device. For example, when the external load 13 is a DC device, or when the external load 13 includes an inverter, the inverter 81 and the inverter control device 82 of the external power supply device 12 may be omitted.
In this case, for example, the appropriate voltage of the external power supply device 12 may be matched with the appropriate voltage of the external load 13.

In the above-described embodiment, the ECU 61 of the fuel cell vehicle 11 and the inverter control device 82 are capable of wireless communication with, for example, an external communication device (for example, a wireless communication portable terminal). Also good. In this case, the ECU 61 and the inverter control device 82 can be controlled by a control signal transmitted from an external communication device.
For example, the ECU 61 receives a power supply start request wirelessly transmitted from a mobile terminal or the like and an appropriate voltage of the external power supply device 12 so that the PDU voltage VP matches the appropriate voltage of the external power supply device 12. The voltage conversion of the regulator 23 and the second voltage regulator 24 can be controlled.

In the above-described embodiment, the power feeding system 10 includes the fuel cell vehicle 11. However, the present invention is not limited to this, and another electric vehicle such as a hybrid vehicle may be included instead of the fuel cell vehicle 11. Good.
Accordingly, the vehicle-side power supply for supplying power to the external power supply device 12 may be a capacitor mounted on an electric vehicle, a generator driven by an internal combustion engine, or the like in addition to the fuel cell stack 21 and the battery 22. .

In the above-described embodiment, the second voltage regulator (FCVCU) 24 may be omitted.
Further, in the above-described embodiment, for example, when the power generation stop state of the fuel cell stack 21 or when the power output from the fuel cell stack 21 may be ignored, for example, the modification shown in FIG. In addition, the ECU 61 may place the external power supply contactor unit 35 in a connected state based only on the voltage difference ΔV between the PDU voltage VP and the inverter voltage VI.
When the power output from the fuel cell stack 21 can be ignored, for example, due to the power output from the fuel cell stack 21, overcharge or overcurrent of the battery 22, the external power supply contactor unit 35 This is a case where no problems such as overheating occur.

First, for example, in step S31 shown in FIG. 7, it is determined whether or not the external power supply contactor unit 35 is in a connected state (ON).
If this determination is “NO”, the flow proceeds to step S32.
On the other hand, if this determination is “YES”, the flow proceeds to return.

In step S32, a voltage difference ΔV between the PDU voltage VP and the inverter voltage VI is calculated.
Next, in step S33, it is determined whether or not the absolute value of the voltage difference ΔV is equal to or smaller than a predetermined voltage difference.
If this determination is “YES”, the flow proceeds to step S 34, and in this step S 34, the external power supply contactor unit 35 is switched from the cutoff state (OFF) to the connected state (ON), and the flow proceeds to return.
On the other hand, if this determination is “NO”, the flow proceeds to step S35.

  Next, in step S35, the inverter voltage VI is set to the command value (first output voltage) for the output voltage of the first voltage regulator 23, and the output voltage of the first voltage regulator 23 matches the inverter voltage VI. In this manner, the voltage conversion of the first voltage regulator 23 is controlled, and the process proceeds to return.

For example, at time t0 shown in FIG. 8, the ECU 61 issues a power supply start request when the PDU voltage VP exceeds the predetermined voltage difference and is greater than the inverter voltage VI in the cutoff state (OFF) of the external power supply contactor unit 35. Upon acquisition, as shown at time t1, the inverter voltage VI is set to the command value (first output voltage) for the output voltage of the first voltage regulator 23, and the output voltage of the first voltage regulator 23 is set to the inverter voltage VI. The voltage conversion of the first voltage regulator 23 is controlled so as to match.
In the embodiment shown in FIG. 8, the command value (first output voltage) for the output voltage of the first voltage regulator 23 before the time t1 is set to an appropriate initial value V0, for example.

  For example, as shown at time t2, when the voltage difference ΔV between the PDU voltage VP and the inverter voltage VI reaches a predetermined voltage difference or less, the ECU 61 changes the external power supply contactor unit 35 from the disconnected state (OFF) to the connected state (ON). ). Accordingly, the voltage difference ΔV converges toward zero, and the PDU voltage VP and the inverter voltage VI become the same, for example, as shown at time t3.

  In the embodiment shown in FIG. 6, after time t3, for example, a constant inverter voltage VI is maintained as the command value (first output voltage) for the output voltage of the first voltage regulator 23, for example, at time As shown after t4, an appropriate voltage value according to the request of the external power supply apparatus 12 is set.

  The present embodiment described above shows an example in carrying out the present invention, and it goes without saying that the present invention is not construed as being limited to the above-described embodiment.

10 Power Supply System 11 Fuel Cell Vehicle (Electric Vehicle)
12 External power supply device 21 Fuel cell stack (second power supply)
22 Battery (first power supply)
23 First voltage regulator (voltage converter)
24 Second voltage regulator (second voltage converter)
25 traveling motor 35 external power supply contactor section 36 control device 61 ECU (control means, appropriate voltage acquisition means, request acquisition means)
81 Inverter 84 Inverter voltage sensor (input voltage acquisition means)

Claims (3)

An electric power supply system comprising an electric vehicle and an external electric power supply device that can be attached to and detached from the electric vehicle,
The electric vehicle is
A first power source and a second power source;
A traveling motor driven by the power of the first power source and the second power source connected in parallel;
A voltage converter capable of converting and outputting the voltage of the first power source;
Appropriate voltage acquisition means for acquiring an appropriate voltage of the external power supply device;
Control means,
The external power supply device can be connected to the output side of the voltage converter,
The power supply system, wherein the control means controls voltage conversion of the voltage converter such that an output voltage of the voltage converter matches the appropriate voltage acquired by the appropriate voltage acquisition means. An external power supply contactor capable of switching between connection and disconnection between the electric vehicle and the external power supply device;
Request acquisition means for acquiring a power supply start request of the external power supply device;
Input voltage acquisition means for acquiring an input voltage of the external power supply device;
With
When the power supply start request is acquired by the request acquisition unit, the control unit stops the power supply of the second power supply in a cut-off state of the external power supply contactor, and outputs the output voltage of the voltage converter and the The external power supply contactor is set in a connected state after controlling voltage conversion of the voltage converter such that a difference from the input voltage acquired by the input voltage acquiring means is within a predetermined difference. Item 2. The power feeding system according to Item 1. A second voltage converter capable of converting and outputting the voltage of the second power supply;
The external power supply device can be connected between the output side of the voltage converter and the output side of the second voltage converter,
The control means controls voltage conversion of the voltage converter and the second voltage converter such that output voltages of the voltage converter and the second voltage converter coincide with the appropriate voltage. The power feeding system according to claim 1, wherein:

Images