JP2014056771A - External feeder controller for fuel cell vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an external feeder controller for fuel cell vehicles, capable of ensuring desired power supply efficiency while appropriately treating an off-gas discharged from a fuel cell stack.SOLUTION: ECU 61 intermittently performs an efficiency priority operation and output suppression operation or a power generation stop for a fuel cell stack 21 on the basis of a battery 22 residual capacity SOC when feeding electric power from a fuel cell vehicle 11 to an external feeder 12. The ECU 61 always continues driving an air pump 26, and upon the output suppression drive or power generation stop of the fuel cell stack 21, the ECU 61 controls the air pump 26 driving in extra-low rotation so that the air flow rate becomes the specified amount or more for reaching a prescribed dilution to an anode off-gas in a diluter.

Description

  The present invention relates to an external power supply control device for a fuel cell vehicle.

  Conventionally, for example, a power supply system that allows a stationary power supply system (external power supply system) including an inverter to be detachable from a fuel cell vehicle including a fuel cell and a storage battery, and supplies power from the fuel cell and the storage battery to the inverter. Is known (see, for example, Patent Document 1).

JP 2006-325392 A

By the way, according to the power supply system according to the above-described prior art, when power is supplied to the external power feeding system while the fuel cell vehicle is stopped, compared to when power is supplied to the driving motor or the like during operation of the fuel cell vehicle, There is a case where a low-load power generation state of the fuel cell is maintained for a long time. In addition, compared to the power supply during operation of the fuel cell vehicle, when the power is supplied to the external power supply system while the fuel cell vehicle is stopped, the required power is small and the operation with priority given to the efficiency of the fuel cell is continued. In some cases, a power generation stop state (so-called idle stop state) for a longer time is provided.
When the fuel cell is in a low load power generation state, the flow rate of air supplied from the air pump to the cathode of the fuel cell is small, and in the fuel cell power generation stop state, the driving of the air pump is stopped.

By the way, with respect to a temporary power generation stop state of the fuel cell such as an idling stop state provided during operation of the fuel cell vehicle, the anode off-gas discharged from the anode of the fuel cell is diluted with air supplied from the air pump. In the diluter, the anode off gas concentration is prevented from becoming excessive.
In other words, for the temporary power generation stop state of the fuel cell provided during the operation of the fuel cell vehicle, the concentration of the anode off gas in the diluter does not reach a predetermined upper limit value, the size of the diluter, etc. A predetermined dilution capacity is set.
However, if the low-load power generation state and power generation stop state are continued for a long time when power is supplied to the external power supply system, the concentration of anode off-gas increases due to insufficient air volume exceeding the predetermined dilution capacity of the diluter. There is a risk of doing.

For example, if the fuel cell is operated so as to prioritize the dilution of the anode off-gas with air in the diluter, the energy efficiency of the entire power supply system is reduced. Occurs.
For example, when power is supplied from the fuel cell vehicle to the external power supply system, the generated power becomes surplus. When the air pump is operated in a low power generation state and the air supply to the diluter is restarted, it becomes difficult to perform desired energy management control.

  The present invention has been made in view of the above circumstances, and provides an external power supply control device for a fuel cell vehicle capable of ensuring desired operation efficiency while appropriately processing off-gas discharged from a fuel cell stack. It is an object.

  In order to solve the above-described problems and achieve the object, an external power feeding control device (for example, the control device 34 in the embodiment) of the fuel cell vehicle according to the first invention of the present invention has an anode (for example, in the implementation). A fuel cell stack (for example, fuel in the embodiment) that generates electricity by supplying fuel (for example, hydrogen in the embodiment) and air supplied to a cathode (for example, cathode 21C in the embodiment) supplied to the anode 21A) in the embodiment Battery stack 21), fuel supply means for supplying the fuel to the fuel cell stack (for example, the hydrogen tank 107, the first hydrogen supply valve 109, and the second hydrogen supply valve 111 in the embodiment), and the fuel cell stack An air pump for supplying the air to the air (for example, the air pump 26 in the embodiment), and the fuel A diluter (for example, diluter 120 in the embodiment) that dilutes anode off-gas discharged from the anode of the pond stack with the air supplied from the air pump, and a power storage device (for example, battery 22 in the embodiment) A travel motor driven by the electric power of the fuel cell stack and the power storage device (for example, the travel motor 24 in the embodiment), and an electric power of the fuel cell stack and the power storage device outside the vehicle (for example, implementation) A power supply circuit (for example, the power supply port 11a in the embodiment) that can be supplied to the external power supply device 12 and the external load 13) and a control unit (for example, the ECU 61 in the embodiment), the control unit Is an efficiency superiority of the fuel cell stack when power is supplied to the device by the power supply circuit. Intermittently running and stopping operation and output suppression operation or power generation, the flow rate of the air constantly continues driving of the air pump so as to become greater than a predetermined flow rate required for a predetermined dilution in the diluter.

According to the external power supply control device for a fuel cell vehicle according to the first aspect of the present invention, the state of the fuel cell stack (that is, efficiency priority operation, output suppression operation, Regardless of whether the power generation is stopped, etc., the air pump is continuously driven at an extremely low speed so that the air flow rate is equal to or higher than the predetermined flow rate required for the predetermined dilution of the anode off gas in the diluter.
This allows the desired energy management control to be performed without restriction without having to change the state of the fuel cell stack, for example, for dilution of the anode off gas in the diluter.
Furthermore, desired operating efficiency can be ensured while appropriately processing the anode off gas, and the energy efficiency of the entire system can be improved.

It is a lineblock diagram of an electric supply system concerning an embodiment of the invention. 1 is a configuration diagram of a fuel cell system according to an embodiment of the present invention. It is a figure which shows an example of the correspondence of the efficiency at the time of the power generation of the fuel cell system which concerns on embodiment of this invention, and electric power generation amount (generated electric power). It is a flowchart which shows operation | movement of the electric power feeding system which concerns on embodiment of this invention. It is a flowchart which shows operation | movement of the electric power feeding system which concerns on embodiment of this invention. The battery remaining capacity, the state of the fuel cell stack and the amount of power generation, the state of the purge valve, the amount of hydrogen inside the diluter, and the outlet of the diluter during external power feeding of the power feeding system according to the embodiment of the present invention It is a figure which shows an example of the correspondence of the change of hydrogen concentration of and the flow volume of air. The remaining capacity of the battery, the state of the fuel cell stack and the power generation amount, the state of the purge valve, the amount of hydrogen inside the diluter and the dilution during external power feeding of the power feeding system according to the comparative example of the embodiment of the present invention It is a figure which shows an example of the correspondence of the change of the hydrogen concentration of the exit of a vessel, and the flow volume of air.

  Hereinafter, an external power supply control device for a fuel cell vehicle according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  An external power supply control device 1 for a fuel cell vehicle according to the present embodiment is mounted on a fuel cell vehicle 11 constituting a power supply system 10 as shown in FIG. 1, for example, and the power supply system 10 is, for example, a fuel cell vehicle 11. And an external power feeding device 12 provided separately from the fuel cell vehicle 11, and supplies electric power to an external load 13 such as an external AC device.

The external power supply control device 1 of the fuel cell vehicle includes, for example, a power supply port 11a connected to the power source of the fuel cell vehicle 11 in the trunk room at the rear of the fuel cell vehicle 11 and the external power supply device 12 in the trunk room. It can be mounted on.
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 external power supply control device 1 for a fuel cell vehicle includes, for example, a fuel cell stack 21, a battery 22, a voltage regulator (VCU) 23, a travel motor 24, a power drive unit (PDU) 25, an air pump 26, Air pump inverter (APINV) 27, downverter (DV) 28, 12V battery 29, battery precharge unit 30 and battery contactor unit 31, external power supply precharge unit 32 and external power supply contactor unit 33, and control device 34.

  The fuel cell stack 21 includes, for example, a solid polymer electrolyte membrane composed of a cation exchange membrane, a fuel electrode (anode) 21A 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. ) An electrolyte electrode structure sandwiched between 21C and a plurality of fuel battery cells sandwiched between a pair of separators are laminated. 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 26 to the cathode 21C of the fuel cell stack 21, and a fuel tank (reaction gas) containing hydrogen is supplied to the anode 21A with a high-pressure hydrogen tank ( (Not shown).
Then, when the reaction gas is supplied, hydrogen ionized by the catalytic reaction on the anode catalyst of the anode 21A moves to the cathode 21C through the moderately humidified solid polymer electrolyte membrane, and is generated along with this movement. Electrons are taken out to an external circuit and generate DC power. At this time, at the cathode 21C, hydrogen ions, electrons, and oxygen react to generate 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 voltage regulator 23.

The voltage regulator 23 includes, for example, a DC-DC converter and the like, and performs voltage regulation for power exchange between the fuel cell stack 21 and the battery 22.
The voltage regulator 23 includes, for example, a smoothing capacitor 23a on the battery 22 side.

The traveling motor 24 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 25.
For example, the traveling motor 24 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) 24a. 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 25 includes, for example, a bridge circuit formed by bridge connection using a plurality of switching elements such as transistors, and an inverter using 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 a torque command value output from the control device 34, for example, during powering operation of the traveling motor 24. . As a result, the DC power supplied from the battery 22 via the voltage regulator 23 or the DC power supplied from the fuel cell stack 21 is converted into three-phase AC power and energized to the coils of each phase of the traveling motor 24. Are sequentially commutated to energize each phase current of AC.

  On the other hand, for example, during power generation operation of the traveling motor 24, the inverter turns each switching element on (conductive) / off (cut off) in accordance with a gate signal synchronized based on the rotation angle of the rotor of the traveling motor 24. The AC generated power output from the traveling motor 24 is converted into DC power.

  The air pump 26 is, for example, an electric compressor including a pump driving motor (not shown) that is rotationally driven by AC power output from the air pump inverter 27. The air pump 26 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 27 is, for example, a pulse width modulation (PWM) PWM inverter or the like, and based on a control signal output from the control device 34, direct current power or fuel supplied from the battery 22 via the voltage regulator 23. The pump drive motor of the air pump 26 is rotationally driven by the DC power supplied from the battery stack 21 to control the rotation speed of the pump drive motor.

  The downverter 28 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 voltage regulator 23 to a predetermined low voltage (12 V). The 12V battery 29 is charged with the predetermined voltage power after step-down.

  The 12V battery 29 outputs, for example, low-voltage predetermined voltage power for driving an electric load including the control device 34 and various auxiliary machines.

The battery precharge unit 30 and the battery contactor unit 31 are provided between the battery 22, the voltage regulator 23, and the downverter 28, for example.
The battery precharge unit 30 includes, for example, a precharge contactor 41 and a precharge resistor 42 connected in series.

The battery contactor unit 31 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 30 is connected to both ends of the positive battery contactor 43 (that is, in parallel to the positive battery contactor 43).

The external power supply precharge unit 32 and the external power supply contactor unit 33 are provided, for example, between the battery precharge unit 30 and the battery contactor unit 31 and the power supply port 11a.
The external power feeding precharge unit 32 includes, for example, a precharge contactor 51 and a precharge resistor 52 connected in series.

The external power supply contactor 33 includes, for example, a positive-side external power supply contactor 53 connected to the positive-side battery contactor 43 in the positive-side high-voltage line (HV +) of the fuel cell vehicle 11 and a negative-side high-voltage line (HV−). A negative-side external power supply contactor 54 connected to the negative-side battery contactor 44.
The external power supply precharge unit 32 is connected to both ends of the positive electrode side external power supply contactor 53 (that is, connected in parallel to the positive electrode side external power supply contactor 53).

  And each contactor 41,43,44,51,53,54 can switch conduction | electrical_connection and interruption | blocking based on the control signal output from the control apparatus 34, for example.

  The control device 34 includes 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 traveling motor 24 by controlling the power conversion operation of the power drive unit 25, for example.
For example, the ECU 61 calculates the target torque of the travel motor 24 based on signals output from various sensors, switches, and the like so that the torque actually output from the travel motor 24 matches the target torque. The feedback control for the current supplied to the traveling motor 24 is performed.

  The ECU 61 controls the reaction to the fuel cell stack 21 by controlling the power conversion operation of the air pump inverter 27, the opening and closing of various valves provided in the reaction gas flow path, the voltage adjustment operation of the voltage regulator 23, and the like. The 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 26, 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 various state quantities calculated, the battery precharge unit 30 and the battery contactor unit 31 are controlled to be turned on and off, thereby controlling the charging and discharging of the battery 22.

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 power feeding to the external power feeding device 12 by controlling conduction and interruption of the external power feeding precharge unit 32 and the external power feeding contactor unit 33.

  Note that the ECU 61 is connected to a meter 78 made up of instruments for displaying various states of the fuel cell vehicle 11 together with various sensors and switches.

  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 33 through, for example, a smoothing capacitor 81a.

  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 34 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 (external power supply 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 fitting (for example, a fitting signal), a control voltage signal supplied from the ECU 61 to the inverter control device 82, and an inverter voltage (detected value) VI detected by the inverter voltage sensor 84. And the detection result signal.

For example, as shown in FIG. 2, the fuel cell stack 21 constitutes a fuel cell system 100.
And the external electric power feeding control apparatus 1 of a fuel cell vehicle is provided with the fuel cell system 100, for example.
The fuel cell system 100 includes, for example, a fuel cell stack (FC) 21, a gas supply system 100a, and a cooling system 100b.

  The gas supply system 100a includes, for example, an intake 101, an air pump (AP) 26, an air-cooled intercooler (IC) 103, a humidifier 104, a pressure control valve 105, an injection 106, a hydrogen tank 107, and a tank. The internal hydrogen cutoff valve 108, the first hydrogen supply valve 109, the hydrogen cutoff valve 110, the second hydrogen supply valve 111, the ejector 112, the gas-liquid separator 113, the circulation valve 114, and the air intake valve 115. A purge valve 116, an exhaust valve 117, a drain valve 118, a diluter 120, a dilution assist valve 121, first to fifth temperature sensors 122a to 122e, a flow rate sensor 123, and first to fourth. Pressure sensors 124a to 124d.

The intake 101 is provided at, for example, the other end (that is, the upstream end in the gas flow direction) of the cathode gas flow channel 100 </ b> A having one end connected to the cathode supply port 21 a of the fuel cell stack 21.
The air pump 26 includes, for example, an air compressor that is provided on the downstream side of the intake 101 in the cathode gas flow channel 100 </ b> A and is driven and controlled by the control device 34.
For example, the air pump 26 takes in air from the outside via the intake 101 and compresses it, and discharges the compressed air to the cathode gas flow channel 100A.

  For example, the cathode gas flow path 100A between the intake 101 and the air pump 26 is provided with a first temperature sensor 122a and a flow sensor 123, and the first temperature sensor 122a and the flow sensor 123 are taken in from the outside by the air pump 26. The air temperature T1 and the flow rate G1 are detected, and a detection result signal is output.

  For example, the air-cooled intercooler 103 is provided downstream of the air pump 26 in the cathode gas flow channel 100A, cools the air discharged from the air pump 26, and discharges the cooled air to the cathode gas flow channel 100A.

  For example, the humidifier 104 is connected to the cathode gas flow channel 100A between the air-cooled intercooler 103 and the cathode supply port 21a, and is connected to the cathode discharge port 21b of the fuel cell stack 21 at one end (that is, the exhaust gas flow direction). Is connected to the cathode gas discharge flow channel 100B to which a water permeable membrane such as a hollow fiber membrane is provided.

For example, the humidifier 104 humidifies the air (cathode gas) in the cathode gas flow channel 100 </ b> A using an exhaust gas (cathode offgas) such as air discharged from the cathode 21 </ b> C of the fuel cell stack 21 as a humidifying gas. .
The humidifier 104, for example, brings the moisture contained in the exhaust gas by bringing the air supplied from the air pump 26 into contact with the wet exhaust gas discharged from the cathode 21C of the fuel cell stack 21 through a water permeable membrane. Moisture that has permeated through the membrane hole of the water permeable membrane is added to air (cathode gas).

The cathode gas bypass channel 100C connected to the cathode gas channel 100A so as to bypass the humidifier 104 is provided with a first pressure sensor 124a, and the first pressure sensor 124a is disposed in the cathode gas bypass channel 100C. The air pressure is detected, and a signal indicating the detection result is output.
The cathode gas discharge channel 100B between the cathode discharge port 21b and the humidifier 104 is provided with a second temperature sensor 122b, and the second temperature sensor 122b is the temperature of the cathode off gas discharged from the cathode discharge port 21b. T2 is detected, and a detection result signal is output.

  The pressure control valve 105 is provided, for example, between the downstream side of the humidifier 104 and the diluter 120 in the cathode gas discharge channel 100B. Under control of the control device 34, the pressure control valve 105 controls the cathode off-gas in the cathode gas discharge channel 100B. Control the pressure.

  The injection 106 is provided, for example, in the signal gas channel 100D that branches from between the air-cooled intercooler 103 and the humidifier 104 in the cathode gas channel 100A, and the pressure of the air in the signal gas channel 100D is used as the signal pressure. Supply to the second hydrogen supply valve 111.

The hydrogen tank 107 is provided, for example, at the other end of the anode gas flow path 100E whose one end is connected to the anode supply port 21c of the fuel cell stack 21 (that is, the upstream end in the gas flow direction), and stores compressed hydrogen. In addition, hydrogen can be discharged.
The in-tank hydrogen cutoff valve 108 is provided in the hydrogen tank 107, for example, and can shut off the discharge of hydrogen from the hydrogen tank 107.

  The anode gas flow path 100E between the hydrogen tank 107 and the in-tank hydrogen cutoff valve 108 is provided with a third temperature sensor 122c, and the third temperature sensor 122c is a temperature T3 of hydrogen discharged from the hydrogen tank 107. Is detected and a detection result signal is output.

The first hydrogen supply valve 109 is provided, for example, on the downstream side of the tank hydrogen cutoff valve 108 in the anode gas flow path 100E, and the pressure of the hydrogen discharged from the hydrogen tank 107 is reduced by the control of the control device 34 or the like. Then, the decompressed hydrogen is discharged to the anode gas flow path 100E.
The anode gas flow path 100E between the tank hydrogen cutoff valve 108 and the first hydrogen supply valve 109 is provided with a second pressure sensor 124b, and the second pressure sensor 124b is more than the first hydrogen supply valve 109. The pressure P2 of hydrogen in the anode gas flow path 100E on the upstream side is detected, and a detection result signal is output.

The hydrogen cutoff valve 110 is provided, for example, on the downstream side of the first hydrogen supply valve 109 in the anode gas flow path 100E, and can block the hydrogen flow in the anode gas flow path 100E by the control of the control device 34 or the like. is there.
The anode gas flow path 100E between the first hydrogen supply valve 109 and the hydrogen shut-off valve 110 is provided with a third pressure sensor 124c, and the third pressure sensor 124c is downstream of the first hydrogen supply valve 109. The pressure P3 of hydrogen in the anode gas flow path 100E is detected and a detection result signal is output.

  The second hydrogen supply valve 111 is provided, for example, on the downstream side of the hydrogen cutoff valve 110 in the anode gas flow path 100E, and discharges hydrogen at a pressure corresponding to the signal pressure supplied from the injection 106 to the anode gas flow path 100E. Then, the pressure difference between the anode 21A and the cathode 21C of the fuel cell stack 21 is maintained at a predetermined pressure.

For example, the ejector 112 is provided on the downstream side of the second hydrogen supply valve 111 in the anode gas flow path 100E.
For example, the ejector 112 is connected to the nozzle 112a connected to the upstream side of the anode gas flow path 100E, the discharge pipe 112b connected to the downstream side of the anode gas flow path 100E, and the anode discharge port 21d of the fuel cell stack 21 at one end. A secondary flow introduction pipe 112c connected to the anode gas circulation flow path 100G branched from the anode gas discharge flow path 100F to which the exhaust gas flow direction is connected (that is, the upstream end in the exhaust gas flow direction).

  For example, the ejector 112 passes a part of the exhaust gas (anode offgas) containing unreacted hydrogen discharged from the anode discharge port 21d through the anode 21A of the fuel cell stack 21 from the second hydrogen supply valve 111 to the anode. It is mixed with hydrogen supplied to the gas flow path 100E and supplied again to the anode 21A of the fuel cell stack 21.

The gas-liquid separator 113 is provided, for example, in the anode gas discharge channel 100F, separates moisture contained in the exhaust gas (anode offgas) in the anode gas discharge channel 100F, and discharges the separated exhaust gas to the gas outlet. It discharges | emits from 113a, and the water | moisture content after isolation | separation is discharged | emitted from the moisture discharge port 113b.
The gas-liquid separator 113 is provided with a fourth temperature sensor 122d. The fourth temperature sensor 122d detects the temperature T4 of the exhaust gas in the gas-liquid separator 113 and outputs a detection result signal.

The circulation valve 114 is, for example, a check valve provided in the anode gas circulation channel 100G that connects the gas discharge port 113a of the gas-liquid separator 113 and the side flow introduction pipe 112c of the ejector 112.
The circulation valve 114 allows, for example, a forward gas flow, which is a direction from the gas-liquid separator 113 to the ejector 112, and a reverse gas, which is a direction from the ejector 112 to the gas-liquid separator 113. Block distribution.

For example, the air intake valve 115 branches from between the air-cooled intercooler 103 and the humidifier 104 in the cathode gas flow channel 100A and is connected between the ejector 112 and the anode supply port 21c in the anode gas flow channel 100E. Provided in the air intake channel 100H.
The air intake valve 115 can supply air for scavenging or the like from the cathode gas channel 100A to the anode gas channel 100E under the control of the control device 34, for example.

  The air intake flow path 100H between the air intake valve 115 and the anode gas flow path 100E is provided with a fourth pressure sensor 124d, and the fourth pressure sensor 124d is located on the downstream side of the air intake valve 115. The pressure P4 of the air in the air intake passage 100H is detected, and a detection result signal is output.

  The purge valve 116 is provided, for example, between the gas discharge port 113a of the gas-liquid separator 113 and the diluter 120 in the anode gas discharge channel 100F, and the gas discharge of the gas-liquid separator 113 is controlled by the control device 34. Exhaust gas discharged from the outlet 113a can be supplied to the diluter 120.

The exhaust valve 117 is, for example, a gas discharge flow that connects the gas discharge port 113a of the gas-liquid separator 113 in the anode gas discharge flow channel 100F and the pressure control valve 105 and the diluter 120 in the cathode gas discharge flow channel 100B. It is provided on the road 100J.
The exhaust valve 117, for example, controls the scavenging air discharged from the gas-liquid separator 113 after being introduced into the anode gas flow path 100E via the air intake valve 115 under the control of the control device 34, as a gas discharge The diluter 120 can be supplied through the flow channel 100J and the cathode gas discharge flow channel 100B.

  The drain valve 118 is provided in, for example, a moisture discharge channel 100K that connects the purge valve 116 and the diluter 120 in the moisture discharge port 113b of the gas-liquid separator 113 and the anode gas discharge channel 100F. 34, the water discharged from the water discharge port 113 b of the gas-liquid separator 113 can be supplied to the diluter 120.

  For example, the diluter 120 dilutes the hydrogen concentration of the exhaust gas exhausted from the purge valve 116 with the air exhausted from the pressure control valve 105 and the air exhausted from the dilution assist valve 121, and the diluted hydrogen concentration Can be discharged outside (for example, in the atmosphere).

  For example, the dilution auxiliary valve 121 is provided in the dilution auxiliary flow path 100L that branches from between the air-cooled intercooler 103 and the humidifier 104 in the cathode gas flow path 100A, and is controlled by the control device 34. The air inside can be supplied to the diluter 120.

  The cooling system 100b includes, for example, a water pump (WP) 131, a radiator 132, a radiator fan 133, a thermostat valve 134, a heat exchanger 135, and an ion exchanger 136.

  For example, the water pump 131 is coaxial with the air pump 26 and is rotatable in synchronization with the air pump 26, and is provided with a refrigerant supply port in the refrigerant circulation channel 100 </ b> M via the refrigerant channel provided in the fuel cell stack 21. It is provided on the 21e side, takes in the cooling water that is the cooling medium in the refrigerant circulation channel 100M and increases the pressure, and discharges the increased cooling water to the refrigerant supply port 21e.

  The radiator 132 is provided, for example, on the refrigerant outlet 21f side in the refrigerant circulation passage 100M, and cools the cooling water discharged from the refrigerant outlet 21f by natural ventilation or forced ventilation by the radiator fan 133, and cooling after cooling. Water is discharged into the refrigerant circulation channel 100M.

  For example, a fifth temperature sensor 122e is provided downstream of the refrigerant discharge port 21f in the refrigerant circulation channel 100M, and the fifth temperature sensor 122e calculates the temperature T5 of the cooling water discharged from the refrigerant discharge port 21f. Detect and output a detection result signal.

For example, the thermostat valve 134 switches between cooling water discharged from the refrigerant discharge port 21f of the fuel cell stack 21 and cooling water discharged from the radiator 132 in accordance with the temperature of the cooling water flowing inside. The pump 131 can be supplied.
For example, when the cooling water is below a predetermined temperature, the thermostat valve 134 supplies the cooling water discharged from the refrigerant discharge port 21f of the fuel cell stack 21 to the water pump 131 bypassing the radiator 132. On the other hand, for example, when the cooling water is higher than a predetermined temperature, the cooling water is supplied to the water pump 131 via the radiator 132 after being discharged from the refrigerant discharge port 21f of the fuel cell stack 21.

  The heat exchanger 135 is provided in, for example, a branch refrigerant channel 100N that branches from between the water pump 131 and the refrigerant supply port 21e of the fuel cell stack 21 in the refrigerant circulation channel 100M, and is branched from the refrigerant circulation channel 100M. Hydrogen is cooled between the second hydrogen supply valve 111 and the ejector 112 in the anode gas flow channel 100E by a part of the cooling water flowing through the flow channel 100N.

  A gas-liquid separator 113 is provided on the downstream side of the heat exchanger 135 in the refrigerant flow direction in the branch refrigerant channel 100N, and the gas-liquid separator 113 is cooled by the cooling water in the branch refrigerant channel 100N. The

  The ion exchanger 136 is provided, for example, on the downstream side of the gas-liquid separator 113 in the branch refrigerant flow path 100N, removes ions present in the cooling liquid, reduces the conductivity of the cooling liquid, and after the ions are removed. The cooling water is discharged between the refrigerant outlet 21f of the fuel cell stack 21 in the refrigerant circulation passage 100M, the radiator 132, and the thermostat valve 134.

  The power supply system 10 according to the present embodiment has the above-described configuration. Next, the operation of the external power supply control device 1 of the fuel cell vehicle, particularly the operation of the ECU 61 will be described.

  ECU61 controls the electric power generation state of the fuel cell stack 21 according to the state of the fuel cell vehicle 11 and the battery 22, for example.

  For example, when the fuel cell vehicle 11 is not connected to the fuel cell vehicle 11, the ECU 61 operates as a normal power generation operation according to the amount of power generation required for the operation of the fuel cell vehicle 11. The power generation of the fuel cell stack 21 is controlled so that the power generation amount (generated power) P of the fuel cell stack 21 can be changed from zero to a predetermined maximum power generation amount PM.

  The ECU 61, for example, when power is supplied from the external power supply device 12 connected to the fuel cell vehicle 11 to the external load 13 (at the time of external power supply), external power supply and appropriate auxiliary equipment of the fuel cell vehicle 11 are provided. The power generation of the fuel cell stack 21 is controlled by an output suppression operation or an intermittent operation by an idle stop and an efficiency priority operation according to the amount of power generation required for power feeding and charging of the battery 22 or the like.

In the output suppression operation, for example, the current output from the fuel cell stack 21 is made less than a predetermined current (that is, the power generation amount is less than the predetermined power generation amount) by suppressing the supply of air from the air pump 26 to the fuel cell stack 21. It is the operation to regulate.
The idle stop is a state in which the current output from the fuel cell stack 21 is set to zero (that is, the power generation amount is zero) by, for example, temporarily stopping the supply of air from the air pump 26 to the fuel cell stack 21. is there.
Further, in the efficiency priority operation, for example, as shown in FIG. 3, the power generation amount (power generation) P of the fuel cell stack 21 is set within a predetermined power generation amount range β (first power generation amount P1 ≦ P ≦ second power generation amount P2). It is a driving to regulate to. The predetermined power generation amount range β is a power generation amount range in which the efficiency E during power generation of the fuel cell system 100 as a whole is within a predetermined efficiency range α including the maximum value EM (lower limit efficiency E0 ≦ E ≦ maximum efficiency EM). is there.

For example, when the ECU 61 performs the output suppression operation or the intermittent operation by the idle stop and the efficiency priority operation with respect to the fuel cell stack 21 during the external power feeding, the predetermined flow rate required for the predetermined dilution degree in the diluter 120 is required. The driving by the extremely low rotation of the air pump 26 is continuously continued so that the flow rate is exceeded.
Note that the predetermined dilution level is, for example, required for the hydrogen concentration of the exhaust gas discharged from the outlet of the diluter 120 to the outside (for example, in the atmosphere) to be less than the predetermined concentration. The ratio of the amount of air to the amount of anode off gas.

Below, an example of operation | movement of ECU61 is demonstrated. Note that the following series of processing is repeatedly executed at a predetermined cycle, for example.
First, for example, in step S01 shown in FIG. 4, it is determined whether or not a fitting signal indicating fitting between the power feeding port 11a of the fuel cell vehicle 11 and the power feeding connector 12a of the external power feeding device 12 has been acquired.
If this determination is “YES”, the flow proceeds to step S 12 described later.
On the other hand, if this determination is “NO”, the flow proceeds to step S 02.

Next, in step S02, it is determined whether or not the speed (vehicle speed) of the fuel cell vehicle 11 is a predetermined value or less.
If this determination is “NO”, the flow proceeds to step S 03, and in this step S 03, the normal power generation processing of the fuel cell stack 21 is performed according to the power generation amount required for the operation of the fuel cell vehicle 11. The power generation amount (generated power) P of the fuel cell stack 21 can be changed from zero to a predetermined maximum power generation amount PM, the power generation of the fuel cell stack 21 is controlled, and the process proceeds to the end.
On the other hand, if this determination is “YES”, the flow proceeds to step S 04.

Next, in step S04, it is determined whether or not the accelerator opening is equal to or less than a predetermined opening.
If this determination is “NO”, the flow proceeds to step S 03 described above.
On the other hand, if this determination is “YES”, the flow proceeds to step S 05.
In step S05, output suppression operation or idle stop is started by suppressing or temporarily stopping the supply of air from the air pump 26 to the fuel cell stack 21.

Next, in step S06, it is determined whether or not the remaining capacity SOC of the battery 22 is greater than or equal to a predetermined first remaining capacity SOC1.
If this determination is “NO”, the flow proceeds to step S 10 described later.
On the other hand, if this determination is “YES”, the flow proceeds to step S07.

Next, in step S07, it is determined whether or not a predetermined time has elapsed since the start of the output suppression operation or idle stop.
When the determination result is “NO”, the process proceeds to step S08, and in this step S08, the electric power necessary for the output suppression operation or the idling stop is supplied from the battery 22, and the process proceeds to the end.
On the other hand, if this determination is “YES”, the flow proceeds to step S 09, and in this step S 09, as the idle power generation processing of the fuel cell stack 21, the power generation amount is larger than the output suppression operation and smaller than the normal power generation. The power generation amount is output so that the power generation of the fuel cell stack 21 is controlled and the process proceeds to the end.

In step S10, it is determined whether or not the remaining capacity SOC of the battery 22 is less than a predetermined second remaining capacity SOC2 that is smaller than a predetermined first remaining capacity SOC1.
If this determination is “YES”, the flow proceeds to step S 09 described above.
On the other hand, if this determination is “NO”, the flow proceeds to step S11.

In step S11, it is determined whether or not the output suppression operation or the idle stop is being executed.
If this determination is “YES”, the flow proceeds to step S 07 described above.
On the other hand, if this determination is “NO”, the flow proceeds to step S 09 described above.

Further, for example, in step S12 shown in FIG. 5, it is determined whether or not the remaining capacity SOC of the battery 22 is greater than or equal to a predetermined first remaining capacity SOC1.
If this determination is “NO”, the flow proceeds to step S 14 described later.
On the other hand, if the determination is “YES”, the flow proceeds to step S13.

  Next, in step S13, power is supplied from the battery 22 to the external power supply device 12 with the fuel cell stack 21 in an output suppression operation or idle stop state. Further, the flow rate of the air discharged from the air pump 26 is set to be equal to or higher than the predetermined flow rate required for the predetermined dilution by the air with respect to the anode off-gas in the diluter 120, and the driving by the extremely low rotation of the air pump 26 is continuously continued. Rotation drive is executed and the process proceeds to the end.

In step S14, it is determined whether the remaining capacity SOC of the battery 22 is less than a predetermined second remaining capacity SOC2 that is smaller than a predetermined first remaining capacity SOC1.
If this determination is “NO”, the flow proceeds to step S 16 described later.
On the other hand, if the determination is “YES”, the flow proceeds to step S15.

In step S15, the fuel cell stack 21 is set to the efficiency priority operation state, power is supplied from the fuel cell stack 21 to the external power supply device 12, and the process proceeds to the end.
Moreover, in step S16, it is determined whether the output suppression operation or the idle stop is being executed.
If this determination is “YES”, the flow proceeds to step S 13 described above.
On the other hand, if this determination is “NO”, the flow proceeds to step S 15 described above.

For example, as shown in FIG. 6, when the ignition switch 71 is turned ON by the driver at time t1 when the external power feeding device 12 is connected to the fuel cell vehicle 11 in a stopped state, an external power feeding request is instructed. The signal to be switched is switched from OFF to ON.
At this time, the predetermined power generation amount Pa of the fuel cell stack 21 provides power necessary for external power supply, power supply to appropriate auxiliary equipment of the fuel cell vehicle 11, charging of the battery 22, and the like. Power generation by the efficiency priority operation of the battery stack 21 is started. The flow rate of the air taken in from the outside by the air pump 26 is controlled to be a predetermined first flow rate Ga required for generating a predetermined power generation amount Pa from the fuel cell stack 21.
Further, the battery 22 is charged by the generated power output from the fuel cell stack 21, and the remaining capacity SOC changes in an increasing trend.

Then, when the purge valve 116 is temporarily opened, for example, at time t2, in order to prevent over-humidification inside the fuel cell stack 21 due to generated water accompanying power generation, the amount of hydrogen in the diluter 120 and The hydrogen concentration at the outlet of the diluter 120 changes from zero to an increasing tendency.
The amount of hydrogen inside the diluter 120 and the hydrogen concentration at the outlet of the diluter 120 are appropriately set after time t3 when the purge valve 116 is closed due to, for example, a time delay required for hydrogen diffusion or the like. It becomes maximum at the timing. Then, due to the valve closing of the purge valve 116 and the continuous intake of air from the outside by the air pump 26, the tendency to decrease is changed.

For example, when the remaining capacity SOC of the battery 22 reaches a predetermined first remaining capacity SOC1 at time t4, the command signal indicating execution of idle stop or output suppression operation is switched from OFF to ON, and the fuel cell stack 21 This state is switched from efficiency priority operation to idle stop or output suppression operation.
Accordingly, the power generation amount of the fuel cell stack 21 is set to zero in the idling stop, and the power generation amount of the fuel cell stack 21 is regulated to be less than the predetermined power generation amount in the output suppression operation. For example, as shown after time t4, the battery 22 The remaining capacity SOC changes toward a predetermined second remaining capacity SOC2.

After this time t4, the purge valve 116 is kept closed in accordance with the idling stop or the output suppression operation of the fuel cell stack 21. Further, the air pump 26 is configured such that the flow rate of air taken in from the outside by the air pump 26 is equal to or higher than a predetermined flow rate (for example, a predetermined second flow rate Gb) required for predetermined dilution by the air with respect to the anode off gas in the diluter 120. The drive by the extremely low rotation of is always continued.
As a result, the amount of hydrogen inside the diluter 120 changes to a downward trend.
Further, the hydrogen concentration at the outlet of the diluter 120 gradually increases with a time delay required for the diffusion of hydrogen or the like due to, for example, the temporary opening of the purge valve 116 performed previously. It is maintained below a predetermined upper limit concentration Ha.

  For example, as shown at time t10, when the ignition switch 71 is turned OFF by the driver, the command signal (IGSW) indicating the start of the fuel cell vehicle 11 and the signal indicating the external power supply request are changed from ON to OFF. Can be switched. The power generation amount of the fuel cell stack 21 becomes zero.

  Note that, for a predetermined period after the fuel cell vehicle 11 stops, the driving of the air pump 26 is continued, for example, by decreasing the hydrogen concentration at the outlet of the diluter 120 toward zero.

As described above, according to the external power supply control device 1 for a fuel cell vehicle according to the present embodiment, the flow rate of the air taken in from the outside by the air pump 26 during the external power supply is the predetermined required for the predetermined dilution of the diluter 120. The drive by the extremely low rotation of the air pump 26 is always continued so that the flow rate is exceeded.
Thus, for example, the desired energy management control can be performed without restriction without having to change the state of the fuel cell stack 21 for the purpose of diluting the anode off gas in the diluter 120.
Furthermore, desired operating efficiency can be ensured while appropriately processing the anode off gas, and the energy efficiency of the power feeding system 10 as a whole can be improved.

For example, as in the comparative example shown in FIG. 7, when the drive of the air pump 26 is stopped while the fuel cell stack 21 is idlingly stopped during external power feeding, it is difficult to perform desired energy management control.
For example, at time t4 shown in FIG. 7, when the driving of the air pump 26 is stopped at the same time as the start of idling stop at the time of external power feeding, the diluter 120 of the diluter 120 is caused due to the temporary opening of the purge valve 116 executed previously. When the hydrogen concentration at the outlet changes to increase, this increase in hydrogen concentration is not suppressed.

For this reason, for example, at time t5, when the hydrogen concentration at the outlet of the diluter 120 reaches a predetermined upper limit concentration Ha or higher, the remaining capacity SOC of the battery 22 is slightly decreased from the predetermined first remaining capacity SOC1. However, the power generation by the efficiency priority operation of the fuel cell stack 21 is resumed by giving priority to the dilution of the hydrogen concentration in the diluter 120.
Then, the driving of the air pump 26 is resumed, and the flow rate of air taken in from the outside by the air pump 26 becomes a predetermined first flow rate Ga required for generating a predetermined power generation amount Pa from the fuel cell stack 21. Controlled.

Thus, for example, after time t5, the amount of hydrogen inside the diluter 120 and the hydrogen concentration at the outlet of the diluter 120 change toward zero due to the continuous supply of air from the air pump 26.
Further, the battery 22 is charged by the generated power output from the fuel cell stack 21, and the remaining capacity SOC tends to increase again toward the first remaining capacity SOC1 from a value slightly decreased from the predetermined first remaining capacity SOC1. To change.

At time t6, when the purge valve 116 is temporarily opened, for example, to prevent over-humidification inside the fuel cell stack 21 due to generated water accompanying power generation, the amount of hydrogen inside the diluter 120 and The hydrogen concentration at the outlet of the diluter 120 changes from zero to an increasing tendency.
The amount of hydrogen in the diluter 120 and the hydrogen concentration at the outlet of the diluter 120 are appropriately determined after time t7 when the purge valve 116 is closed due to, for example, a time delay required for hydrogen diffusion or the like. It becomes maximum at the timing. Then, due to the valve closing of the purge valve 116 and the continuous intake of air from the outside by the air pump 26, the tendency to decrease is changed.

For example, when the remaining capacity SOC of the battery 22 reaches a predetermined first remaining capacity SOC1 at time t8, the command signal indicating execution of idle stop is switched from OFF to ON, and the state of the fuel cell stack 21 is efficient. Switch from priority operation to idle stop.
Accordingly, in idle stop, the power generation amount of the fuel cell stack 21 is set to zero, the drive of the air pump 26 is stopped, and the remaining capacity SOC of the battery 22 changes to a decreasing tendency, for example, as shown after time t8.

After this time t8, the purge valve 116 is kept closed with the idle stop of the fuel cell stack 21, so the amount of hydrogen inside the diluter 120 has a time delay required for hydrogen diffusion and the like. Then gradually decrease.
In addition, the hydrogen concentration at the outlet of the diluter 120 gradually increases with a time delay required for hydrogen diffusion or the like due to the temporary opening of the purge valve 116 performed previously. The increase in concentration is not suppressed.

For this reason, for example, at time t9, when the hydrogen concentration at the outlet of the diluter 120 reaches a predetermined upper limit concentration Ha or higher, the remaining capacity SOC of the battery 22 is slightly decreased from the predetermined first remaining capacity SOC1. However, the power generation by the efficiency priority operation of the fuel cell stack 21 is resumed by giving priority to the dilution of the hydrogen concentration in the diluter 120.
Then, the driving of the air pump 26 is resumed, and the flow rate of air taken in from the outside by the air pump 26 becomes a predetermined first flow rate Ga required for generating a predetermined power generation amount Pa from the fuel cell stack 21. Controlled.

Thereby, for example, after time t9, the amount of hydrogen inside the diluter 120 and the hydrogen concentration at the outlet of the diluter 120 are changed to a decreasing tendency toward zero due to continuous supply of air from the air pump 26.
Further, the battery 22 is charged by the generated power output from the fuel cell stack 21, and the remaining capacity SOC tends to increase again toward the first remaining capacity SOC1 from a value slightly decreased from the predetermined first remaining capacity SOC1. To change.

  For example, as shown at time t10, when the ignition switch 71 is turned OFF by the driver, the command signal (IGSW) indicating the start of the fuel cell vehicle 11 and the signal indicating the external power supply request are changed from ON to OFF. Can be switched. The power generation amount of the fuel cell stack 21 becomes zero.

That is, for example, in the comparative example shown in FIG. 7, in the fuel cell stack 21 that is idlingly stopped due to surplus generated power at the time of external power feeding, only to prioritize the dilution of the anode off gas in the diluter 120. Power generation is resumed.
Thereby, in the comparative example, for example, even when charging to the battery 22 is unnecessary, the idle stop of the fuel cell stack 21 is frequently interrupted, and noise and vibration associated with the driving of the air pump 26 increase. The problem that the energy efficiency as the whole electric power feeding system 10 cannot be improved arises.

On the other hand, according to the present embodiment as shown in FIG. 6, for example, the driving of the air pump 26 is continuously continued in the idling stop or the output suppression operation of the fuel cell stack 21.
As a result, while the anode off gas is appropriately diluted in the diluter 120, the idling stop or output suppression operation of the fuel cell stack 21 is interrupted at an unintended timing only for giving priority to the dilution of the anode off gas in the diluter 120. Can be prevented. Then, the external power supply by the power generated by the fuel cell stack 21 and the external power supply by the discharge of the battery 22 can be appropriately switched according to the remaining capacity SOC of the battery 22 and the desired energy management control can be easily performed. Therefore, a desired external power supply time can be secured.
Moreover, the air pump 26 is only driven at an extremely low rotation, and the generation of noise and vibration associated with the driving of the air pump 26 can be suppressed.

  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.

DESCRIPTION OF SYMBOLS 1 External power supply control apparatus 10 of fuel cell vehicle Power supply system 11 Fuel cell vehicle 11a Power supply port (power supply circuit)
12 External power supply equipment (equipment)
12a Power supply connector 13 External load (equipment)
21 Fuel cell stack 21A Anode 21C Cathode 22 Battery (power storage device)
23 Voltage regulator 24 Traveling motor 26 Air pump 34 Control device (external power feeding control device for fuel cell vehicle)
51 Precharge contactor (feed circuit)
53 Positive side external feeding contactor (feeding circuit)
54 Negative side external feeding contactor (feeding circuit)
61 ECU (control means)
107 Hydrogen tank (fuel supply means)
109 First hydrogen supply valve (fuel supply means)
111 Second hydrogen supply valve (fuel supply means)
120 diluter

Claims (1)

A fuel cell stack that generates electricity with the fuel supplied to the anode and the air supplied to the cathode;
Fuel supply means for supplying the fuel to the fuel cell stack;
An air pump for supplying the air to the fuel cell stack;
A diluter for diluting the anode off-gas discharged from the anode of the fuel cell stack with the air supplied from the air pump;
A power storage device;
A traveling motor driven by electric power of the fuel cell stack and the power storage device;
A power feeding circuit capable of supplying power from the fuel cell stack and the power storage device to equipment outside the vehicle;
Control means,
The control means includes
When the power supply circuit supplies power to the device, the fuel cell stack performs an efficiency priority operation and an output suppression operation or power generation stop intermittently, and the air flow rate is a predetermined flow rate required for a predetermined dilution in the diluter. As described above, an external power feeding control device for a fuel cell vehicle, wherein the driving of the air pump is continuously continued.

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