JP4714170B2 - Fuel cell vehicle - Google Patents

Description

The present invention relates to a fuel cell vehicle including a high voltage power source and a low voltage power source.

  In recent years, attention has been focused on electric vehicles such as electric vehicles and fuel cell vehicles from the viewpoint of environmental protection. Such an electric vehicle includes a high-voltage power supply having a large charging capacity and a travel motor (load) that generates a driving force for traveling the electric vehicle with electric power supplied from the high-voltage power supply. A switch that is turned on when the ignition is turned on is provided between the high-voltage power source and the traveling motor.

In addition, the electric vehicle includes an ECU (Electronic Control Unit) that controls power supply from the high-voltage power source to the traveling motor, and a battery (low-voltage power source) of, for example, 12 V that serves as a power source for accessories including the ECU. (See Patent Document 1). The battery is connected between the travel motor and a switch that is turned on in conjunction with the ignition being turned on via a DC / DC converter.
JP 10-248263 A

  However, in the electric vehicle described in Patent Document 1, when the driver selects an accessory mode that can easily operate various accessories without supplying power to the traveling motor (load), not in the ignition ON state. The accessory including the ECU operates using the low-voltage power source as a power source in a state where power is not supplied from the high-voltage power source to the low-voltage power source. Therefore, the operable time of the accessory including the ECU in the accessory mode depends on the charge capacity of the battery.

Therefore, an object of the present invention is to provide a fuel cell vehicle capable of continuing the accessory mode for a long time regardless of the charging capacity of a low voltage power source such as a 12V battery.

As means for solving the above-mentioned problems, the present invention is arranged in parallel with the high-voltage power source for charging and discharging electric energy, a load for generating a driving force by the electric power supplied from the high-voltage power source, A low-voltage power source charged with power from a high-voltage power source, step-down means for stepping down power from the high-voltage power source to the low-voltage power source, a first switch unit provided between the high-voltage power source and the load, And a second switch unit provided between the first switch unit and the load , and cuts off or connects power from the high-voltage power source to the load and power from the high-voltage power source to the low-voltage power source. A switch unit, a fuel cell connected between the load and the second switch unit, a hydrogen tank filled with hydrogen toward the fuel cell, and between the load and the second switch unit Connected Comprising a compressors, and a control means for controlling the step-down unit and the switch unit, the low-voltage power supply via a step-down means, connected between said first switching unit and the second switching unit cage, hydrogen is supplied to the fuel cell from the hydrogen tank, air is supplied to the fuel cell from said compressor, an oN mode in which the fuel cell generates electric power, hydrogen is not supplied to the fuel cell from the hydrogen tank The fuel cell does not generate electricity, does not supply power from the high-voltage power source to the load, and the accessory mode operates, and hydrogen is not supplied from the hydrogen tank to the fuel cell, and the fuel cell without power, anda OFF mode the load and the accessory stops, a fuel cell vehicle that travels by a driving force generated by the load, Serial fuel cell through the fuel cell switch to be opened when the accessory mode or OFF mode closed when the ON mode is connected between the load and the second switch, OFF from ON mode When the mode or the accessory mode is switched, the compressor operates using the high-voltage power supply as a power source through the first switch unit and the second switch unit closed by the control means , and supplies scavenging gas to the fuel cell. Thus, when scavenging the fuel cell and switching from the OFF mode to the accessory mode, the control means is configured so that the power from the high voltage power source is supplied to at least one of the low voltage power source and the accessory. closing said first switch unit, open the second switch unit, the fuel cell and controls the step-down hand stage It is both.

According to such a fuel cell vehicle , the power supply from the high-voltage power source to at least one of the low-voltage power source and the accessory and the accessory mode in which the accessory operates without interlocking the power supply to the load. That is, in the accessory mode, the control means supplies power from the high-voltage power supply to at least one of the low-voltage power supply and the accessory (low-voltage power supply side), so that the accessory operates regardless of the charge amount of the low-voltage power supply. Can do. As a result, the accessory mode can be continued for a long time. In addition, since it is not necessary to increase the amount of charge of the low-voltage power supply, the volume and mass of the low-voltage power supply do not increase, and the handling thereof does not decrease.

According to such a fuel cell vehicle , in the accessory mode, the control means opens the second switch unit, so that the high-voltage power source and the load are electrically disconnected. As a result, power is not supplied from the high-voltage power supply to the load. Further, in the accessory mode, the control means closes the first switch unit, so that the high voltage power supply and the low voltage power supply via the voltage lowering means are electrically connected. As a result, power from the high-voltage power supply is supplied to at least one of the low-voltage power supply and the accessory, and the low-voltage power supply can be charged with the supplied power, and the accessory can be operated by this power. That is, in the accessory mode, it is possible to supply power to at least one of the low-voltage power supply and the accessory without supplying power to the load, so that the power stored in the high-voltage power supply can be used effectively.

The fuel cell vehicle further includes charge amount detection means for detecting a charge amount of the low-voltage power supply, and the control means is configured such that, in the accessory mode, the charge amount detected by the charge amount detection means is a predetermined charge amount. determines whether or less, when it is less than a predetermined charge amount, and operates the step-down transforming means, and this supplies power to at least one of said low-voltage power supply and the accessory from the high voltage power supply is preferred.

According to such a fuel cell vehicle , in the accessory mode, the control means determines whether or not the charge amount of the low-voltage power source is equal to or less than the predetermined charge amount. Then, only when the charge amount of the low-voltage power supply is equal to or less than the predetermined charge amount, the control means operates the step-down means and supplies power from the high-voltage power supply to at least one of the low-voltage power supply and the accessory. That is, when the charge amount of the low-voltage power source is not less than the predetermined charge amount, the control means does not operate the step-down means. Thereby, unnecessary operation of the step-down means can be prevented, and as a result, power consumption by the step-down means can be suppressed.

The fuel cell vehicle may further include an inverter that converts direct current power to the load into alternating current power, and a smoothing capacitor that is provided in parallel with the inverter, and the control means is in the accessory mode. , that you do not perform the charging of the capacitor for the smoothing is preferable.
According to such a fuel cell vehicle , in the accessory mode, since the control means does not charge the smoothing capacitor, the life of the smoothing capacitor can be extended.

In the fuel cell vehicle, a step-up / down converter is preferably provided between the load and the second switch unit .

According to the present invention, it is possible to provide a fuel cell vehicle capable of continuing the accessory mode for a long time regardless of the charging capacity of a low voltage power source such as a 12V battery.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2 as appropriate.

≪Configuration of electric vehicle≫
As shown in FIG. 1, an electric vehicle 1 (electric mobile body) according to the present embodiment includes a high-voltage secondary battery 11 (high-voltage power source), a first switch unit 12, a second switch unit 20, and a PDU 31 (Power Drive unit, inverter), smoothing capacitor 32, travel motor 35 (load), DC / DC converter 41 (step-down means), 12V battery 42 (low-voltage power supply), and accessory 50 including ECU 51 (control means) And.
In addition to the ECU 51, the accessory 50 corresponds to the user's preference and usability, so that the user can add or replace the electric equipment at the time of purchase or after purchase of the electric vehicle 1 according to his / her preference. Products, a detection device that detects vehicle information, and a meter that displays a detection value (for example, a remaining amount detector 52, a speedometer, and various thermometers described later).

  The electric vehicle 1 has an OFF mode, an accessory mode, and an ON mode. The OFF mode is a mode in which the traveling motor 35 and the accessory 50 are stopped. The accessory mode is a mode in which the accessory 50 is operated while the traveling motor 35 is stopped. The ON mode is the mode in which the traveling motor 35 and the accessory 50 are operated. It is a mode to operate. That is, the accessory mode is a mode in which various accessories 50 can be operated easily without supplying power to the traveling motor 35 (load) in response to the user's needs.

The high-voltage secondary battery 11 is a high-voltage power source that can charge and discharge electrical energy and has a large charge capacity (for example, 200 to 350 V). The output terminal (not shown) of the high-voltage secondary battery 11 is connected to the travel motor 35 via the first switch unit 12, the second switch unit 20, and the PDU 31. That is, when viewed from the high voltage secondary battery 11, the second switch unit 20 is disposed downstream of the first switch unit 12 when the traveling motor 35 is in the downstream direction.
The first switch unit 12 and the second switch unit 20 are switches that turn on (connect) / off (shut off) the electrical connection between the high-voltage secondary battery 11 and the travel motor 35 and are independently controlled by the ECU 51. It is like that.

The first switch unit 12 is a switch that is turned on in the accessory mode and the ON mode.
The second switch unit 20 is a switch that is turned on in the ON mode. Specifically, the second switch unit 20 enters the ON mode from the accessory mode, and the precharge contactor 21 that is turned on when the smoothing capacitor 32 is charged (precharged) in advance, and the main contactor that is turned on after precharging. 23. A precharge resistor 22 is disposed in series with the precharge contactor 21.

  That is, the electric vehicle 1 has a switch unit (switching means) configured to include the first switch unit 12 and the second switch unit 20, and the power supply of the high-voltage secondary battery 11 is performed on the battery 42 side. And can be appropriately switched between the battery 42 side and the traveling motor 35 side. That is, the power from the high-voltage secondary battery 11 to the traveling motor 35 and the power from the high-voltage secondary battery 11 to the battery 42 are cut off or connected (supplied) by the switch unit.

  The PDU 31 is an inverter that converts DC power from the high-voltage secondary battery 11 into a three-phase AC current, and includes a three-phase AC current generation circuit. The three-phase alternating current is output to the traveling motor 35.

The smoothing capacitor 32 is arranged in parallel with the PDU 31 with respect to the high-voltage secondary battery 11, and is accompanied by a function for preventing a high-voltage current from entering the PDU 31 from the high-voltage secondary battery 11 and the power supplied to the PDU 31. And a function to remove noise.
The travel motor 35 is an electric motor serving as a power source for the electric vehicle 1, and generates a rotational force (driving force) by a three-phase alternating current from the PDU 31.

  The battery 42 is a low-voltage power source capable of charging and discharging electric energy, and its charging capacity is smaller than that of the high-voltage secondary battery 11. The battery 42 is connected between the first switch unit 12 and the second switch unit 20 via the DC / DC converter 41. That is, the battery 42 is connected to the downstream position of the first switch unit 12 via the DC / DC converter 41, and the battery 42 and the travel motor 35 are arranged in parallel with respect to the high-voltage secondary battery 11. ing.

  The DC / DC converter 41 is a device that steps down the power supplied from the high-voltage secondary battery 11 to the battery 42. Further, the DC / DC converter 41 is of a normally OFF type, and is set to be electrically disconnected from the high voltage secondary battery 11 and the battery 42 when not operating. When the DC / DC converter 41 operates in accordance with a command from the ECU 51, the DC / DC converter 41 steps down the power from the high voltage secondary battery 11 and supplies it to the battery 42 and / or the accessory 50.

  In the present embodiment, the accessory 50 includes an ECU 51, a remaining amount detector 52 (charge amount detection means), an IG 53 (ignition), an in-vehicle stereo, an indoor lamp, and the like. The ECU 51, the remaining amount detector 52, the IG 53, the in-vehicle stereo, and the like are connected in parallel to the battery 42 (DC / DC converter 41). 42 is operated by at least one of the charging power, that is, the reduced power and the charging power.

  The remaining amount detector 52 detects the SOC (State Of Charge) of the battery 42 and is provided at an appropriate position of the battery 42. The remaining amount detector 52 outputs the detected SOC to the ECU 51.

  The IG 53 is a switch operated by the driver to operate the electric vehicle 1 in the mode selected by the driver from the OFF mode, the accessory mode, and the ON mode, and is in three positions corresponding to these three modes. (OFF, accessory (ACC), ON). Then, the IG 53 outputs signals corresponding to these three positions to the ECU 51.

The ECU 51 is a controller that electronically controls the electric vehicle, and includes a CPU, a ROM, a RAM, various interfaces, an electronic circuit, and the like, and operates according to a program stored therein in advance. Yes.
Such an ECU 51 has a function of determining whether the driver has selected an OFF mode, an accessory mode, or an ON mode based on a signal corresponding to the position from the IG 53.

  The ECU 51 has a function of controlling the first switch unit 12, the second switch unit 20, and the DC / DC converter 41 in accordance with the mode selected by the driver.

<OFF mode>
When the OFF mode is selected, the ECU 51 turns off (opens) the first switch unit 12 and the second switch unit 20 (precharge contactor 21, main contactor 23), and the high voltage secondary battery 11, the traveling motor 35, and The battery 42 is electrically disconnected and the DC / DC converter 41 is turned off (stopped). Thereby, in the OFF mode, power is not supplied from the high-voltage secondary battery 11 to the traveling motor 35 and the battery 42.

<Accessory mode>
When the accessory mode is selected, the ECU 51 is set to turn on (close) the first switch unit 12 and turn off (open) the second switch unit 20. As a result, the high voltage secondary battery 11 and the traveling motor 35 are electrically disconnected, and power is not supplied from the high voltage secondary battery 11 to the traveling motor 35. Therefore, in the accessory mode, the smoothing capacitor 32 is not charged. As a result, the number of times the smoothing capacitor 32 is charged is reduced, and the life of the smoothing capacitor 32 is extended.

  In parallel with this, when the accessory mode is selected, the ECU 51 is set to operate the DC / DC converter 41. Thus, the power from the high voltage secondary battery 11 is stepped down by the DC / DC converter 41 and then supplied to the battery 42 side, that is, the stepped down power is supplied to the battery 42 and / or the accessory 50. It has become. Therefore, when the accessory mode is selected, the accessory 50 can operate regardless of the SOC (charge amount) of the battery 42. As a result, the accessory mode can be continued for a long time. That is, since the duration of the accessory mode can be extended without increasing the charging capacity of the battery 42, the battery 42 can be freely laid out without increasing the volume and mass of the battery 42.

In addition to this, when the accessory mode is selected, the ECU 51 may operate the DC / DC converter 41 in accordance with the current SOC of the battery 42 input from the remaining amount detector 52.
That is, the SOC of the battery 42 that should start the operation of the DC / DC converter 41 (this is the predetermined SOC, which is the starting SOC) and the SOC of the battery 42 that should stop the operation of the DC / DC converter 41 (stop this) Is stored in the ECU 51 in advance, and the ECU 51 determines whether or not the current SOC is less than or equal to the start SOC. If it is determined that the current SOC is less than or equal to the start SOC, the ECU 51 The operation of the converter 41 may be started, the power from the high voltage secondary battery 11 may be stepped down, and supplied to the battery 42 and / or the accessory 50.
Then, after supplying such electric power, the ECU 51 determines whether or not the current SOC is equal to or higher than the stop SOC, and when it is determined that the current SOC is equal to or higher than the stop SOC, the battery 42 is charged. Therefore, it is good also as a structure which stops the action | operation of the DC / DC converter 41. FIG.

With such a configuration, the DC / DC converter 41 can be operated in accordance with the SOC of the current battery 42, so that the number of operations of the DC / DC converter 41 can be reduced and the DC / DC converter can be operated. It is possible to suppress power consumption by the converter 41, that is, power consumption by the DC / DC converter 41 itself, power consumption including a control signal from the ECU 51 to the DC / DC converter 41, and the like.
The start SOC and the stop SOC are obtained by a preliminary test or the like. For example, the start SOC is set to an SOC that allows the accessory 50 to be activated even when no power is supplied from the high-voltage secondary battery 11. On the other hand, the stop SOC is set to the charge capacity (full SOC) of the battery 42.

<ON mode>
When the ON mode is selected, the ECU 51 is set to turn on (close) the first switch unit 12 and the second switch unit 20. Thereby, the high voltage secondary battery 11 and the traveling motor 35 are electrically connected, and the electric power from the high voltage secondary battery 11 is converted into a three-phase alternating current by the PDU 31, and as a result, the traveling motor 35 rotates. It has become.

  In parallel with this, the ECU 51 is set to operate the DC / DC converter 41 to step down the power from the high-voltage secondary battery 11 and supply it to the battery 42 and / or the accessory 50. In this case, the ECU 51 may be configured to operate the DC / DC converter 41 in accordance with the SOC of the battery 42.

In particular, when the accessory mode is switched to the ON mode, the ECU 51 turns on the precharge contactor 21 of the second switch unit 20 while the first switch unit 12 is continuously turned on. It is configured to be precharged. When the precharge of the smoothing capacitor 32 is completed, the ECU 51 is configured to turn off the precharge contactor 21 and turn on the main contactor 23.
Note that the ON / OFF timing of the precharge contactor 21 and the main contactor 23, that is, the timing at which the precharge of the smoothing capacitor 32 is completed is related to the capacity of the smoothing capacitor 32 and is obtained by a preliminary test or the like and stored in the ECU 51. Has been.

≪Effect of electric car≫
According to such an electric vehicle 1, the following effects can be mainly obtained.
When the accessory mode is selected, the first switch unit 12 is turned on and power is supplied from the high-voltage secondary battery 11 to the battery 42 and / or the accessory 50, so the accessory 50 operates regardless of the SOC of the battery 42. Thus, the accessory mode can be continued for a long time.

Further, when the DC / DC converter 41 is configured to operate in accordance with the SOC of the battery 42, power consumption in the DC / DC converter 41 can be suppressed.
Further, in the accessory mode, the second switch unit 20 is turned off, so that the smoothing capacitor 32 is not charged, and thereby the life of the smoothing capacitor 32 can be extended.

≪Example of operation of electric car≫
Next, an operation example of the electric vehicle will be described with reference to FIG. Here, a case where the ECU 51 operates the DC / DC converter 41 corresponding to the SOC of the battery 42 is illustrated.

  When the driver switches the position of the IG 53 from OFF to an accessory, the ECU 51 detects that the accessory mode is selected instead of the OFF mode, and the ECU 51 turns on the first switch unit 12. Thereafter, in the accessory mode, for example, when a vehicle-mounted stereo (accessory 50) that operates using the battery 42 as a power source is used, the SOC of the battery 42 decreases.

  When the SOC of the battery 42 decreases to the start SOC, the ECU 51 turns on the DC / DC converter 41 to step down the power from the high-voltage secondary battery 11 and supply it to the battery 42 and / or the accessory 50. As a result, the in-vehicle stereo (accessory 50) can continue to operate, the battery 42 is charged, and its SOC starts to rise. Next, when the SOC of the battery 42 reaches the stop SOC, the ECU 51 turns off the DC / DC converter 41.

  Thereafter, when the driver switches the position of the IG 53 from the accessory to ON, the ECU 51 turns on the precharge contactor 21 of the second switch unit 20. Thereby, the precharge of the smoothing capacitor 32 is started.

  Next, when a predetermined time corresponding to the capacity of the smoothing capacitor 32 elapses and the precharge of the smoothing capacitor 32 is completed, the ECU 51 turns off the precharge contactor 21 and turns on the main contactor 23. As a result, a high-voltage current is supplied from the high-voltage secondary battery 11 to the PDU 31, a three-phase alternating current is generated in the PDU 31, and the traveling motor 35 rotates.

  As mentioned above, although one suitable embodiment of the present invention was described, the present invention is not limited to the above-mentioned embodiment, and can be changed as follows, for example, in the range which does not deviate from the meaning of the present invention.

  In the above-described embodiment, the case where the electric mobile body is an electric vehicle has been exemplified, but the present invention is not limited to this. It may be an aircraft. Further, the present invention may be applied to a hybrid vehicle equipped with a high voltage power source and a low voltage power source.

Here, an example of application to a fuel cell vehicle (electric vehicle) will be described with reference to FIG.
As shown in FIG. 3, the fuel cell vehicle 2 includes a fuel cell stack 61, a hydrogen tank 63, a compressor 65, and a step-up / down converter 66 in addition to the configuration of the electric vehicle 1. When the IG 53 is turned on and enters the ON mode, the ECU 51 opens the shutoff valve 64, hydrogen is supplied from the hydrogen tank 63 to the fuel cell stack 61, the compressor 65 is operated, and oxygen-containing air is supplied to the fuel cell stack. 61 is supplied.

  The step-up / down converter 66 is a converter that appropriately boosts / lowers DC power, and is disposed between the second switch unit 20 and the PDU 31. An output terminal (not shown) of the fuel cell stack 61 is connected between the step-up / down converter 66 and the PDU 31 via a switch 62.

  As described above, when the ON mode is entered, the ECU 51 is set to turn on the switch 62 while hydrogen and air are supplied to the fuel cell stack 61, so that the fuel cell stack 61 generates power. It has become. Next, the electric power generated by the fuel cell stack 61 is supplied to the PDU 31 and / or the step-up / down converter 66. The compressor 65 is electrically connected between the step-up / down converter 66 and the PDU 31, and is operated by the power generated by the fuel cell stack 61 and / or the power from the high-voltage secondary battery 11. Yes.

  Further, in the fuel cell vehicle 2, when the position of the IG 53 is switched from ON to OFF (or from ON to accessory), the ECU 51 turns off the switch 62 and stops the power generation of the fuel cell stack 61, and then the fuel cell. The stack 61 is configured to scavenge. The scavenging means that the water in the fuel cell stack 61 is discharged to the outside by the scavenging gas. Here, even after power generation of the fuel cell stack 61 is stopped (after the switch 62 is turned off), the first switch unit 12 and the second switch unit 20 are continuously turned on, and the compressor 65 operates with the high-voltage secondary battery 11 as a power source. The air is set to be sent to the fuel cell stack 61 as a scavenging gas.

  Therefore, when the IG 53 is currently in the OFF position, when the SOC of the battery 42 is small and the battery 42 is to be charged, the first switch unit 12 is turned ON by switching the position of the IG 53 from OFF to the accessory, and the DC / DC converter 41 is turned on and battery 42 is charged. That is, the battery 42 can be charged without turning on the second switch unit 20 and without generating power in the fuel cell stack 61.

  Then, after the battery 42 is charged, when the position of the IG 53 is returned from the accessory to OFF, the power generation of the fuel cell stack 61 is not stopped, and since the fuel cell stack 61 is not generating power in the first place, the fuel cell stack 61 There is no need to perform scavenging when power generation is stopped. Moreover, since the 2nd switch part 20 remains OFF, the compressor 65 does not operate | move. Thus, according to the fuel cell vehicle 2 to which the present invention is applied, the battery 42 is charged while omitting the generated power consumed by the compressor 65 for scavenging when the power generation of the fuel cell stack 61 is stopped. can do.

It is a figure which shows the structure of the electric vehicle which concerns on this embodiment. It is a figure which shows one operation example of the electric vehicle which concerns on this embodiment. It is a figure which shows the structure of the fuel cell vehicle which concerns on a modification.

Explanation of symbols

1 Electric vehicle (electric vehicle)
11 High-voltage secondary battery (high-voltage power supply)
12 First switch part 20 Second switch part 21 Precharge contactor 23 Main contactor 31 PDU (inverter)
32 Smoothing capacitor 35 Traveling motor (load)
41 DC converter (step-down means)
42 battery (low voltage power supply)
50 accessories 51 ECU (control means)
52 Remaining amount detector (charge amount detection means)
53 IG

Claims (4)

A high-voltage power supply that charges and discharges electrical energy;
A load that generates a driving force by the electric power supplied from the high-voltage power source;
A low voltage power source arranged in parallel with the load and charged with power from the high voltage power source;
Step-down means for stepping down power from the high-voltage power source to the low-voltage power source;
A first switch part provided between the high-voltage power supply and the load; and a second switch part provided between the first switch part and the load. And a switch unit that cuts off or connects power from the high-voltage power source to the low-voltage power source,
A fuel cell connected between the load and the second switch unit;
A hydrogen tank filled with hydrogen toward the fuel cell;
A compressor connected between the load and the second switch unit;
Control means for controlling the step-down means and the switch unit;
With
The low-voltage power source is connected between the first switch unit and the second switch unit via the step-down means,
ON mode in which hydrogen is supplied from the hydrogen tank to the fuel cell, air is supplied from the compressor to the fuel cell, and the fuel cell generates power;
An accessory mode in which the accessory operates without hydrogen being supplied from the hydrogen tank to the fuel cell, the fuel cell does not generate electricity, and power is not supplied from the high-voltage power source to the load;
OFF mode in which hydrogen is not supplied from the hydrogen tank to the fuel cell, the fuel cell does not generate electricity, and the load and accessories stop;
Have
A fuel cell vehicle that moves by a driving force generated by the load,
The fuel cell is connected between the load and the second switch part via a fuel cell switch that is closed in the ON mode and opened in the accessory mode or the OFF mode,
When the ON mode is switched to the OFF mode or the accessory mode, the compressor operates using the high-voltage power source as a power source via the first switch unit and the second switch unit closed by the control unit, and supplies the fuel cell. By supplying a scavenging gas, the fuel cell is scavenged;
When switching from the OFF mode to the accessory mode, the control means closes the first switch unit so that power from the high-voltage power supply is supplied to at least one of the low-voltage power supply and the accessory, and the second switch open switch unit, for controlling the step-down hand stage
Fuel cell vehicle, wherein a call. A charge amount detection means for detecting a charge amount of the low-voltage power supply;
In the accessory mode, the control means determines whether or not the charge amount detected by the charge amount detection means is less than or equal to a predetermined charge amount, and when the charge amount is less than or equal to a predetermined charge amount, operates the step-down means, The fuel cell vehicle according to claim 1, wherein electric power is supplied from a high voltage power source to at least one of the low voltage power source and the accessory. An inverter that converts DC power to the load into AC power;
A smoothing capacitor provided in parallel with the inverter;
With
Wherein if the accessory mode, the fuel cell vehicle according to claim 1 or claim 2, characterized in that does not charge the capacitor for the smoothing. The fuel cell vehicle according to any one of claims 1 to 3 , further comprising a step-up / down converter between the load and the second switch unit.

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