JP4939595B2 - Fuel cell vehicle - Google Patents

Description

  The present invention relates to a fuel cell vehicle capable of executing a scavenging process for discharging moisture inside the fuel cell to the outside by circulating air inside the fuel cell by an air pump.

  For example, there is known a fuel cell vehicle that performs a scavenging process that prevents water generated inside the fuel cell from freezing due to power generation (for example, Patent Document 1). In the scavenging process, air inside the fuel cell is discharged to the outside by controlling the air pump (air compressor) to circulate air inside the fuel cell. In Patent Document 1, while the vehicle is stopped, the electronic control device (40) is periodically activated to determine whether or not the scavenging process is necessary (for example, refer to the summary of Patent Document 1 and FIG. 3). Accompanying this determination, power of the battery (3) is consumed (see, for example, paragraph [0043] of FIG. 2 and FIG. 2).

JP 2009-064660 A

  As described above, in Patent Document 1, the electric power of the fuel cell vehicle is consumed by periodically starting the electronic control device in order to determine whether or not the scavenging process is necessary. preferable. In particular, it is preferable to determine whether or not the scavenging process is necessary frequently (for example, every few minutes), and in order to suppress battery deterioration while securing electric power for starting the fuel cell vehicle next time. It is preferable to keep the charge amount of the battery within a certain range. Also from this viewpoint, it is desirable that the power required for determining whether or not the scavenging process is necessary is low.

  The present invention has been made in consideration of such problems, and an object of the present invention is to provide a fuel cell vehicle capable of suppressing power consumption when determining whether or not a scavenging process is necessary while the fuel cell vehicle is left. And

  The fuel cell vehicle according to the present invention includes a fuel cell, an air pump that supplies air to the fuel cell, a power storage device that supplies power to the air pump, and air is circulated inside the fuel cell by the air pump. And an electronic control unit that controls a scavenging process for discharging moisture inside the fuel cell to the outside, and the electronic control unit is used for a program or data necessary for determining the necessity of the scavenging process A storage medium having a first storage area including a storage area and a second storage area including a storage area used for a program or data unnecessary for determining whether or not the scavenging process is necessary; The first storage area is periodically started to perform a first abnormality detection process for detecting an abnormality in the first storage area. As a result of the first abnormality detection process, there is no abnormality in the first storage area. Determining whether or not the scavenging process is necessary, and performing a second abnormality detection process for detecting an abnormality in the second storage area when it is determined that the scavenging process is required. As a result of the second abnormality detection process, If there is no abnormality in the two storage areas, the scavenging process is executed.

  According to the present invention, when the electronic control unit periodically starts up while the fuel cell vehicle is left, only the abnormality in the first storage area is detected before the necessity of the scavenging process is determined. Abnormality detection is not performed. The first storage area includes a storage area used for a program or a numerical value necessary for determining whether the scavenging process is necessary, and a second storage area is a memory used for a program and a numerical value necessary for determining whether the scavenging process is necessary. It does not include an area, but includes a storage area used for a program or numerical value that is unnecessary for determining whether or not the scavenging process is necessary. Therefore, when it is determined that the scavenging process is not required, the abnormality detection in the second storage area is not necessary, and the abnormality detection load can be reduced. As a result, it is possible to suppress power consumption when determining whether or not the scavenging process is necessary.

  The fuel cell vehicle further includes a heater for warming up the fuel cell, the first storage area stores an operation program of the heater, and the electronic control unit performs the first abnormality detection process. An abnormality in the heater operation program is detected, and if there is an abnormality in the second storage area as a result of the second abnormality detection process, the heater operation program is executed without performing the scavenging process. May be activated. Thus, even when the scavenging process cannot be performed due to an abnormality in the second storage area, it is possible to avoid freezing of moisture inside the fuel cell by the heater.

  In the first storage area and the second storage area, programs and data may be arranged in the order of addresses. As a result, it is possible to detect an abnormality in the order of addresses, so that the processing of the electronic control device can be reduced.

  In the second storage area, the program and data may be arranged using an address order subsequent to the address order of the first storage area.

  The first storage area includes a temperature detection program for detecting a temperature by operating a temperature sensor, a charge state detection program for detecting a charge state of a battery, a water pump operation program for operating a water pump, and the temperature detection program. The charging state detection program and the numerical value used for the water pump operation program may be stored.

  According to the present invention, when the electronic control unit periodically starts up while the fuel cell vehicle is left, only the abnormality in the first storage area is detected before the necessity of the scavenging process is determined. Abnormality detection is not performed. The first storage area includes a storage area used for a program or a numerical value necessary for determining whether the scavenging process is necessary, and a second storage area is a memory used for a program and a numerical value necessary for determining whether the scavenging process is necessary. It does not include an area, but includes a storage area used for a program or numerical value that is unnecessary for determining whether or not the scavenging process is necessary. Therefore, when it is determined that the scavenging process is not required, the abnormality detection in the second storage area is not necessary, and the abnormality detection load can be reduced. As a result, it is possible to suppress power consumption when determining whether or not the scavenging process is necessary.

1 is a schematic overall configuration diagram of a fuel cell vehicle according to a first embodiment of the present invention. It is a schematic whole block diagram of the fuel cell unit of the said fuel cell vehicle. It is a figure which shows the memory content of the 2nd EEPROM in 1st Embodiment. It is a figure which shows the memory content of 2nd RAM in 1st Embodiment. In 1st Embodiment, it is a flowchart of the scavenging process and the process relevant to this. It is the figure which compared the power consumption of 1st Embodiment and a comparative example. It is a schematic whole block diagram of the fuel cell vehicle which concerns on 2nd Embodiment of this invention. It is a figure which shows the memory content of the 2nd EEPROM in 2nd Embodiment. It is a flowchart of the scavenging process in 2nd Embodiment, and the process relevant to this.

A. First Embodiment 1. FIG. Configuration [Overall configuration]
FIG. 1 is a schematic overall configuration diagram of a fuel cell vehicle 10 (hereinafter referred to as “FC vehicle 10”) according to a first embodiment of the present invention. In this FC vehicle 10, in addition to the power running operation, a regenerative operation is also possible. When the FC vehicle 10 is powered, the traveling motor 12 is driven by output power from at least one of the fuel cell unit 14 (hereinafter referred to as “FC unit 14”) and the high voltage battery 16 (hereinafter also referred to as “battery 16”). Driven. At this time, the output of the FC unit 14 is controlled by boosting the output voltage of the battery 16 by the DC / DC converter 18. Further, during regeneration of the FC vehicle 10, regenerative power from the motor 12 (motor regenerative power Preg) [W] and possibly output power from the FC unit 14 (FC power Pfc) [W] are supplied to the DC / DC converter 18. The battery 16 is charged via

  The power running operation and the regenerative operation of the FC vehicle 10 are controlled by a control system centered on an integrated control unit 20 (hereinafter referred to as “integrated ECU 20”). Further, a low voltage battery 22 is provided to drive auxiliary devices such as navigation devices, lights, power windows, audio equipment, various sensors, and the control system.

[Drive system]
The motor 12 is of a three-phase AC type, generates a driving force based on electric power supplied from the FC unit 14 and the battery 16 through a power drive unit 24 (hereinafter referred to as “PDU24”), and drives the motor 12. The wheel 28 is rotated through the transmission 26 by force. Further, the motor 12 outputs the motor regenerative power Preg to the battery 16. The motor regenerative power Preg may be output to other auxiliary machines.

  Under the instruction from the integrated ECU 20, the PDU 24 performs DC / AC conversion during power running, converts the DC to three-phase AC and supplies it to the motor 12, while performing AC / DC conversion during regeneration and converts the DC to DC / DC. It is supplied to the battery 16 and the like through the DC converter 18.

[FC unit 14]
FIG. 2 shows a schematic overall configuration diagram of the FC unit 14. As shown in FIG. 2, the FC unit 14 includes a fuel cell 30 (hereinafter referred to as “FC30”), a hydrogen tank 32, an air pump (air compressor) 34, a cooling device 36, and a dilution box 38.

  The FC 30 generates power based on hydrogen gas (fuel gas) supplied from the hydrogen tank 32 and air (oxidant gas) supplied from the air pump 34.

  On the anode side of the FC 30, in addition to the hydrogen tank 32, a shutoff valve 40, a regulator 42, an ejector 44, a drain valve 46, a hydrogen purge valve 48, an air introduction valve 50, and pressure sensors 52, 54, 56 And a temperature sensor 58 are provided. In addition to the air pump 34, a back pressure control valve 60, pressure sensors 62 and 64, a temperature sensor 66, and a rotation speed sensor 68 are provided on the cathode side of the FC 30.

  The cooling device 36 includes a water pump 70 that circulates the refrigerant to the anode side of the FC 30 in conjunction with the air pump 34, an ion exchanger 72 that is disposed in the refrigerant circulation path, and the temperature of the refrigerant (refrigerant temperature Tco) [ Temperature sensor 74 for detecting [° C.]. As for the configuration and operation of the cooling device 36, for example, the one described in Japanese Patent Laid-Open No. 2003-173790 can be used.

  The regulator 42 adjusts the flow rate of hydrogen gas based on the pressure (signal pressure) of air supplied from the air pump 34.

  The pressure sensors 52, 54, and 56 detect the pressure of the fuel gas in each path, and the pressure sensors 62 and 64 detect the pressure of the oxidant gas in each path. The detection values of the pressure sensors 52, 54, 56, 62, and 64 can be used for detecting leakage of fuel gas and oxidant gas. The temperature sensor 58 detects the anode side temperature (anode temperature Tan) [° C.], and the temperature sensor 66 detects the cathode side temperature (cathode temperature Tca) [° C.]. The rotation speed sensor 68 detects the rotation speed Nap [rpm] of the air pump 34.

  The back pressure control valve 60 is a valve for adjusting the pressure of air supplied from the air pump 34 to the FC 30.

  The air pump 34 and the water pump 70 are driven by the output power of the high voltage battery 16, the FC power Pfc, or the motor regenerative power Preg.

[High-voltage battery 16, battery control unit 80, and SOC sensor 82]
The high voltage battery 16 is a secondary battery (for example, a lithium ion secondary battery) capable of outputting a high voltage (for example, several hundred volts), and is configured by combining a plurality of unit cells (not shown).

  The battery control unit 80 (hereinafter referred to as “battery ECU 80”) monitors the temperature (battery temperature Tbat) [° C.], the storage amount (SOC) [%], and the like of the high voltage battery 16. When a temperature abnormality or overcharge is detected, the battery 16 is protected by opening a contactor (not shown) disposed between the battery 16 and the DC / DC converter 18. The SOC sensor 82 detects the SOC of the battery 16.

[DC / DC converter 18 and converter control unit 84]
The DC / DC converter 18 is a so-called chopper step-up / step-down DC / DC converter, and distributes electric power among the motor 12, the FC unit 14, and the high voltage battery 16. The DC / DC converter 18 is connected in series between the motor 12 and the battery 16 and is connected in parallel with the FC 30.

  Converter control unit 84 (hereinafter referred to as “converter ECU 84”) controls the transformation operation of DC / DC converter 18 based on a command from integrated ECU 20. That is, during power running of the FC vehicle 10, the converter ECU 84 boosts the primary side voltage (primary voltage V1) [V] of the DC / DC converter 18 and supplies it to the secondary side. Then, the secondary side voltage (secondary voltage V2) [V] of the DC / DC converter 18 is stepped down and supplied to the primary side. That is, the secondary voltage V2 that is the regenerative voltage (motor regenerative voltage Vreg) [V] generated by the motor 12 or the output voltage (FC output voltage Vfc) [V] of the FC 30 is converted to a low voltage by the DC / DC converter 18. The battery 16 is charged by the primary voltage V1.

[Integrated ECU 20]
The integrated ECU 20 is required power of the motor 12 (motor required power Pmr_req) [W], required power of the FC unit 14 (air pump 34, water pump 70, etc.), required power of auxiliary equipment such as a navigation device (not shown), etc. Based on the above, each part of the motor 12, the FC unit 14, the high voltage battery 16, the DC / DC converter 18 and the like is controlled.

  The integrated ECU 20 and each unit such as the FC unit 14, the battery 16, the DC / DC converter 18, and the PDU 24 are connected to each other via a communication line 90 such as a CAN (Controller Area Network) that is an in-vehicle LAN. The integrated ECU 20 and each unit share input / output information from various switches and various sensors, and each CPU executes various programs by executing programs stored in each ROM with input / output information from these various switches and various sensors as inputs. Realize the function.

  In this embodiment, the integrated ECU 20 controls the overall power generation of the FC 30. The integrated ECU 20 includes, for example, an air pump 34, a cooling device 36, a shutoff valve 40, a drain valve 46, a hydrogen purge valve 48, pressure sensors 52, 54, 56, 62, 64, temperature sensors 58, 66, 74, and a back pressure control valve. 60, the rotational speed sensor 68 and the like are controlled.

  The integrated ECU 20 is turned on when the switch 94 is turned on by the ignition switch 92 (hereinafter referred to as “IGSW 92”) or when the switch 98 is turned on by the timer 96. The timer 96 periodically turns on the switch 98 while the FC vehicle 10 is left unattended (in this embodiment, when the IGSW 92 is off).

  As shown in FIG. 1, the integrated ECU 20 includes a central processing unit 100 (hereinafter referred to as “CPU 100”), a first EEPROM 102 (Electrically Erasable Programmable Read Only Memory) and a second EEPROM 104 as nonvolatile memories, and a volatile memory. As a first RAM 106 (Random Access Memory) and a second RAM 108. The first RAM 106 and the second RAM 108 are, for example, DRAM (Dynamic Random Access Memory). Note that the first EEPROM 102 and the second EEPROM 104 may be configured as one EEPROM, and the first RAM 106 and the second RAM 108 may be configured as one RAM.

  The first EEPROM 102, the second EEPROM 104, the first RAM 106, and the second RAM 108 store, for example, programs and data (numerical values) used for the operation of the FC vehicle 10.

  The first EEPROM 102 stores programs and numerical values (fixed values and variables) related to the overall operation of the FC vehicle 10, and the second EEPROM 104 stores programs and numerical values (fixed values and variables) specialized for the operation of the FC unit 14. ) Etc. are stored. The first RAM 106 stores numerical values (variables) related to the overall operation of the FC vehicle 10, and the second RAM 108 stores numerical values (variables) specialized for the operation of the FC unit 14.

  Further, the second EEPROM 104 has a first area 110 that performs abnormality detection before determining whether or not a scavenging process is necessary, and a second area 112 that performs abnormality detection after determining whether or not a scavenging process is necessary. Similarly, the second RAM 108 includes a first region 114 that performs abnormality detection before determining whether or not a scavenging process is necessary, and a second region 116 that performs abnormality detection after determining whether or not a scavenging process is necessary.

  3 shows the stored contents of the second EEPROM 104, and FIG. 4 shows the stored contents of the second RAM 108. The first area 110 of the second EEPROM 104 and the first area 114 of the second RAM 108 store programs and numerical values used for determining whether or not the scavenging process is necessary.

  That is, in the first area 110 of the second EEPROM 104, a refrigerant temperature detection program (address order 1) for acquiring the refrigerant temperature Tco from the temperature sensor 74, and a cathode temperature detection for acquiring the cathode temperature Tca from the temperature sensor 66. Program (address order 2), anode temperature detection program (address order 3) for obtaining the anode temperature Tan from the temperature sensor 58, and threshold values TH_co, TH_ca, TH_an for the refrigerant temperature Tco, the cathode temperature Tca, and the anode temperature Tan, respectively. (Address order 4), a battery SOC detection program (address order 5) for obtaining the SOC of the high-voltage battery 16 from the SOC sensor 74, the SOC threshold TH_soc (address order 6) of the battery 16, and the water pump 70 About driving Otaponpu driving program and (Address Order 7) are stored.

  In the first area 114 of the second RAM 108, the refrigerant temperature Tco (address order 1), the cathode temperature Tca (address order 2), the anode temperature Tan (address order 3), and the SOC (address) of the high-voltage battery 16 are stored. (The order 4) is stored (the second RAM 108 is a volatile memory, and therefore these numerical values do not exist when the integrated ECU 20 is activated).

  Hereinafter, the first area 110 and the first area 114 are also collectively referred to as a first storage area 120.

  On the other hand, the second area 112 of the second EEPROM 104 and the second area 116 of the second RAM 108 store programs and data (numerical values, etc.) that are not used for determining whether or not the scavenging process is necessary. That is, in the second area 112 of the second EEPROM 104, a scavenging air pump control program (address order 8) relating to the control of the air pump 34 during the scavenging process, a motor control threshold TH_mo (address order 9) used for controlling the motor 12, and A motor control program (address order 10) related to the control of the motor 12 and an air pump control program (address order 11) related to the control of the air pump 34 in the normal state are stored.

  Other than the above, for example, the number of operations of the shutoff valve 40, the regulator 42 and the back pressure control valve 60 [times], the operation time [s] of the ion exchanger 72, the fuel gas and the oxidizer when the IGSW 92 is turned off There is gas pressure (detected values of pressure sensors 52, 54, 56, 62, 64). Furthermore, the number of operations of other valves (such as the drain valve 46 and the hydrogen purge valve 48) and the operation time of the air pump 34 and the water pump 70 may be stored in the second area 112 of the second EEPROM 104.

  Further, in the second area 116 of the second RAM 108, the rotation speed Nap (address order 5) of the air pump 34 during the scavenging process, the FC output voltage Vfc (address order 6), and the temperature of the cooling oil of the motor 12 (address order). 7) and the normal rotation speed Nap (address order 8) of the air pump 34 and the like are stored (since the second RAM 108 is a volatile memory, these numerical values do not exist when the integrated ECU 20 is activated).

  Hereinafter, the second area 112 and the second area 116 are also collectively referred to as a second storage area 122.

[Low voltage battery 22]
The low voltage battery 22 has a lower voltage (for example, 12V) than the high voltage battery 16 for driving the motor 12. The low voltage battery 22 supplies electric power to a control system including the integrated ECU 20 and the like, auxiliary devices such as a navigation device, a light, a power window, and an audio device, and various sensors.

2. Process Related to Scavenging Process FIG. 5 shows a flowchart of the scavenging process and the process related to the first embodiment.

  When power supply from the low voltage battery 22 to the integrated ECU 20 is started by the operation of the IGSW 92 or the operation of the timer 96 in step S1, the integrated ECU 20 executes the activation program stored in the first EEPROM 102 in step S2. .

  In step S <b> 3, the integrated ECU 20 confirms whether or not the current activation is due to the timer 96. The determination can be performed, for example, by the same method as in Patent Document 1. If the current activation is not by the timer 96 (S3: NO), the process proceeds to another process of step S4. For example, when the IGSW 92 is turned on, the process for starting the operation of the FC vehicle 10 is performed without determining whether the scavenging process is necessary. If the current activation is by the timer 96 (S3: YES), the process proceeds to step S5.

  In step S5, the integrated ECU 20 performs abnormality detection (error check) in the first storage area 120 (that is, the first area 110 of the second EEPROM 104 and the first area 114 of the second RAM 108) (first abnormality detection process).

  More specifically, the refrigerant temperature detection program (address order 1), the cathode temperature detection program (address order 2), the anode temperature detection program (address order 1) stored in the first area 110 (address order 1 to 7) of the second EEPROM 104 Address order 3), thresholds TH_co, TH_ca, TH_an (address order 4) for the refrigerant temperature Tco, cathode temperature Tca and anode temperature Tan, battery SOC detection program (address order 5), battery SOC threshold TH_soc (address order 6), and Sum check is performed for each of the water pump drive programs (address order 7) (see FIG. 3). Further, write-and-read processing (processing for performing reading after writing and detecting an abnormality depending on whether the read value matches the written value) for the first area 114 (address order 1 to 4) of the second RAM 108 is performed. Perform (see FIG. 3). The abnormality detection here is not limited to the sum check process and the write-and-read process, and other abnormality detection methods may be used.

  In subsequent step S <b> 6, the integrated ECU 20 confirms whether an abnormality is detected in the first storage area 120. If no abnormality is detected in the first storage area 120 (S6: NO), in step S7, the integrated ECU 20 determines whether or not a scavenging process is necessary.

  This determination is performed, for example, by the same method as that shown in FIG. 2 or FIG. 5 of Japanese Patent Application Laid-Open No. 2009-164019. That is, the integrated ECU 20 operates the temperature sensors 58, 66, and 74 to acquire the anode temperature Tan, the cathode temperature Tca, and the refrigerant temperature Tco.

  When the anode temperature Tan is equal to or lower than the anode temperature threshold TH_an, the cathode temperature Tca is equal to or lower than the cathode temperature threshold TH_ca, or the refrigerant temperature Tco is equal to or lower than the refrigerant temperature threshold TH_co, the integrated ECU 20 Is driven for a predetermined time. Thereafter, when the anode temperature Tan becomes equal to or lower than the anode temperature threshold TH_an, the cathode temperature Tca becomes equal to or lower than the cathode temperature threshold TH_ca, or the refrigerant temperature Tco becomes equal to or lower than the refrigerant temperature threshold TH_co, the integrated ECU 20 performs the scavenging process. Determine that it is necessary.

  In subsequent step S8, the integrated ECU 20 confirms the result of step S7, and when the scavenging process is not necessary (S8: NO), in step S9, the time until the next determination of the necessity of the scavenging process is performed by the timer 96. Set to. In the subsequent step S10, the integrated ECU 20 issues a command to the timer 96 to turn off the switch 98. Thereby, the power supply from the low voltage battery 22 to the integrated ECU 20 is stopped, and the integrated ECU 20 is turned off.

  On the other hand, if the scavenging process is necessary in step S8 (S8: YES), in step S11, the integrated ECU 20 causes the second storage area 122 (that is, the second area 112 of the second EEPROM 104 and the second area 116 of the second RAM 108). ) Is detected (error check) (second abnormality detection process).

  More specifically, the scavenging air pump control program (address order 8), motor control threshold (address order 9), motor control program (address) stored in the second area 112 (address order 8 to n) of the second EEPROM 104 Sum check is performed for each program and numerical value other than the program used for determining whether or not the scavenging process is necessary, such as order 10) and the air pump control program (address order 11) (see FIG. 4). Further, write and read processing is performed on the second area 116 (address order 5 to n) of the second RAM 108 (see FIG. 4). The abnormality detection here is not limited to the sum check process and the write-and-read process, and other abnormality detection methods may be used.

  In subsequent step S <b> 12, the integrated ECU 20 confirms whether an abnormality is detected in the second storage area 122. When no abnormality is detected in the second storage area 122 (S12: NO), in step S13, the integrated ECU 20 executes a scavenging process.

  The scavenging process is performed, for example, by a method similar to paragraphs [0050] to [0052] of Japanese Patent Laid-Open No. 2009-164019. That is, the integrated ECU 20 closes the air introduction valve 50, fully opens the back pressure control valve 60, and drives the air pump 34. Thereby, the water remaining on the cathode side in the FC 30 is discharged to the outside. Subsequently, the integrated ECU 20 opens the drain valve 46 and the air introduction valve 50 to drive the air pump 34. Thereby, the water remaining on the anode side in the FC 30 is discharged to the outside.

  After the scavenging process in step S13, in step S9, the time until the next necessity determination of the scavenging process is set in the timer 96, and in step S10, the integrated ECU 20 is turned off.

  If there is an abnormality in the first storage area 120 in step S6 (S6: YES), or if there is an abnormality in the second storage area 122 in step S12 (S12: YES), the integrated ECU 20 in the first EEPROM 102 in step S14. The abnormality detection flag is stored. When the integrated ECU 20 is activated by something other than the timer 96 (for example, when the IGSW 92 is turned on), the integrated ECU 20 indicates the abnormality on the display unit (not shown) of the instrument panel based on the abnormality detection flag. Turn on the notification lamp. Thereby, the user or the maintenance staff can know the occurrence of the abnormality.

  After step S14, the process proceeds to step S10, and the integrated ECU 20 is turned off (in this case, the timer 96 is not reset).

3. Effects of First Embodiment As described above, according to the first embodiment, when the integrated ECU 20 periodically starts up while the FC vehicle 10 is left, the first memory is stored before determining whether or not the scavenging process is necessary. Only abnormality detection of the area 120 is performed, and abnormality detection of the second storage area 122 is not performed. The first storage area 120 includes first areas 110 and 114 used for determining the necessity of the scavenging process and numerical values, and the second storage area 122 includes a program and numerical values required for determining the necessity of the scavenging process. The second area 112, 116 used for a program and a number that are unnecessary for determining whether or not the scavenging process is necessary is included. Therefore, when it is determined that the scavenging process is not required, the abnormality detection in the second storage area 122 is not necessary, and the abnormality detection load can be reduced. As a result, it is possible to suppress power consumption when determining whether or not the scavenging process is necessary.

  In the first embodiment, the necessity for the scavenging process is mainly determined using the integrated ECU 20, the temperature sensors 58, 66 and 74, and the water pump 70. These are used when the FC vehicle 10 is running, and are not used only for determining whether or not the scavenging process is necessary. Therefore, it is possible to avoid adding new parts for determining whether or not the scavenging process is necessary.

  FIG. 6 is a diagram comparing the power consumption of the first embodiment and the comparative example. In this comparative example, abnormality detection is performed for both the first storage area 120 and the second storage area 122 before determining whether or not the scavenging process is necessary.

  In the first embodiment, at time t1 in FIG. 6, the switch 98 is turned on by the timer 96, and power supply to the integrated ECU 20 is started. At time t2, it is determined that the scavenging process is unnecessary, and the integrated ECU 20 is turned off at time t3. Therefore, in the first embodiment, power is consumed from time t1 to time t3.

  In the comparative example, the switch 98 is turned on by the timer 96 at time t1 in FIG. 6, and power supply to the integrated ECU 20 is started. At time t4, it is determined that the scavenging process is unnecessary, and the integrated ECU 20 is turned off at time t5. Therefore, in the comparative example, power is consumed from time t1 to time t5.

  As is apparent from FIG. 6, the first embodiment consumes less power than the comparative example. Therefore, power consumption can be suppressed.

  In the first storage area 120 and the second storage area 122 of the first embodiment, programs and numerical values are arranged in the order of addresses. This makes it possible to detect an abnormality in the order of addresses, so that the processing of the integrated ECU 20 can be reduced, and power consumption can be further suppressed.

B. Second Embodiment 1. FIG. Configuration (difference from the first embodiment)
FIG. 7 shows a schematic overall configuration diagram of a fuel cell vehicle 10A (hereinafter referred to as “FC vehicle 10A”) according to a second embodiment of the present invention. This FC vehicle 10A is basically the same as the FC vehicle 10 of the first embodiment, but differs in that it has a heater 130 and a point associated therewith. Hereinafter, the same reference numerals are assigned to the same components in the FC vehicle 10 and the FC vehicle 10A, and the description thereof is omitted. In addition, components similar to those of the FC vehicle 10 and the FC vehicle 10 </ b> A are denoted by “a” as reference numerals of the components of the FC vehicle 10.

  The heater 130 is for warming up the FC 30 and is operated by electric power from the high voltage battery 16. The operation of the heater 130 is controlled by the integrated ECU 20a turning on and off the switch 132.

  As shown in FIG. 8, the first area 110a of the second EEPROM 104a includes a “heater driving program” (address order 8) in addition to the contents included in the first area 110 of the second EEPROM 104. As a result, the address order of the contents included in the second area 112a is lowered by one.

2. Processing related to scavenging processing (difference from the first embodiment)
FIG. 9 shows a flowchart of the scavenging process and related processes in the second embodiment. Steps S21 to S33 and S36 in FIG. 9 are the same as steps S1 to S13 and S14 in FIG.

  If there is an abnormality in the second storage area 122a (the second area 112a of the second EEPROM 104a and the second area 116 of the second RAM 108) in step S32 (S32: YES), in step S34, the integrated ECU 20a performs step S14 in FIG. Similarly, an abnormality detection flag is stored in the first EEPROM 102.

  In subsequent step S <b> 35, the integrated ECU 20 a performs a warm-up process by the heater 130. That is, the integrated ECU 20a turns on the switch 132 to connect the high voltage battery 16 and the heater 130, and supplies power from the high voltage battery 16 to the heater 130. Thereby, by raising the temperature of the heater 130, the internal temperature of the FC 30 is raised to a temperature at which moisture does not freeze (the temperature at which the moisture inside the FC 30 does not freeze until the next timer 96 starts). Alternatively, the internal temperature of the FC 30 can be raised to a temperature at which moisture does not freeze and the heater 130 can be kept on to maintain this.

  After step S35, the process proceeds to step S29, and the timer 96 is set for the next time.

3. Effects of the Second Embodiment As described above, according to the second embodiment, the following effects can be obtained in addition to the effects of the first embodiment.

  In the second embodiment, the integrated ECU 20a detects an abnormality in the operation program of the heater 130 during the first abnormality detection process, and if there is an abnormality in the second storage area 122a as a result of the second abnormality detection process, the scavenging process is performed. Without performing the above, the heater 130 is operated by executing the operation program of the heater 130. Thereby, even when the scavenging process cannot be performed due to an abnormality in the second storage area 122, it is possible to avoid the freezing of moisture inside the FC30.

C. Modifications It should be noted that the present invention is not limited to the above-described embodiments, and it is needless to say that various configurations can be adopted based on the contents described in this specification. For example, the following configuration can be adopted.

  In each of the above embodiments, the first EEPROM 102 and the second EEPROM 104 are used as the non-volatile memory. However, the present invention is not limited to this, and for example, a flash memory can be used. Further, although the first RAM 106 and the second RAM 108 which are DRAMs are used as the volatile memory, the present invention is not limited thereto, and for example, an SRAM (Static Random Access Memory) may be used.

  In each of the above embodiments, the first area 110 of the second EEPROM 104 and the first area 114 of the second RAM 108 are included in the first storage area 120, but only one of them may be included in the first storage area 120. Similarly, in each of the above embodiments, the second area 112 of the second EEPROM 104 and the second area 116 of the second RAM 108 are included in the second storage area 122, but only one of them may be included in the second storage area 122. .

  In the first embodiment, the programs and data stored in the first storage area 120 and the second storage area 122 are as shown in FIGS. 3 and 4, and in the second embodiment, the first storage area 120a is used. The programs and data stored in the second storage area 122a are as shown in FIG. 8 and FIG. 4, but these can be changed as appropriate.

DESCRIPTION OF SYMBOLS 10 ... Fuel cell vehicle 16 ... High voltage battery (power storage device)
20, 20a ... Integrated ECU (scavenging means, electronic control unit)
DESCRIPTION OF SYMBOLS 30 ... Fuel cell 34 ... Air pump 58 ... Temperature sensor for anode temperature 66 ... Temperature sensor 70 for cathode temperature ... Water pump 74 ... Temperature sensor 82 for refrigerant temperature ... SOC sensor 104, 104a ... 2nd EEPROM
108 ... second RAM 110 ... second EEPROM first area 112 ... second EEPROM second area 114 ... second RAM first area 116 ... second RAM second area 120 ... first storage area 122 ... second storage area 130 ... heater

Claims (5)

A fuel cell;
An air pump for supplying air to the fuel cell;
A power storage device for supplying power to the air pump;
An electronic control unit for controlling a scavenging process for discharging the moisture inside the fuel cell to the outside by circulating air inside the fuel cell by the air pump,
The electronic control device
A first storage area including a storage area used for a program or data necessary for determining whether the scavenging process is necessary, and a second storage area including a storage area used for a program or data unnecessary for determining whether the scavenging process is necessary A storage medium having a storage area,
Periodically starting while the fuel cell vehicle is left, and performing a first abnormality detection process for detecting an abnormality in the first storage area;
If there is no abnormality in the first storage area as a result of the first abnormality detection process, it is determined whether the scavenging process is necessary,
When it is determined that the scavenging process is required, a second abnormality detection process for detecting an abnormality in the second storage area is performed,
If there is no abnormality in the second storage area as a result of the second abnormality detection process, the scavenging process is executed. The fuel cell vehicle according to claim 1, wherein
The fuel cell vehicle further includes a heater for warming up the fuel cell,
The first storage area stores an operation program of the heater,
The electronic control device
During the first abnormality detection process, an abnormality of the operation program of the heater is detected,
If there is an abnormality in the second storage area as a result of the second abnormality detection process, the heater operation program is executed to operate the heater without performing the scavenging process. . The fuel cell vehicle according to claim 1 or 2,
In the first storage area and the second storage area, a program and data are arranged in the order of addresses. The fuel cell vehicle according to claim 3, wherein
In the second storage area, the program and the numerical value are arranged using an address order subsequent to the address order of the first storage area. In the fuel cell vehicle according to any one of claims 1 to 4,
The first storage area is
A temperature detection program that detects the temperature by operating the temperature sensor;
A charge state detection program for detecting the charge state of the battery;
A water pump operating program for operating the water pump;
The fuel cell vehicle, wherein the temperature detection program, the charge state detection program, and the numerical values used for the water pump operation program are stored.

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