FUEL CELL SYSTEM AND METHOD OF OPERATING THE SAME

1 . A fuel cell system including a fuel cell configured to generate electric power by using a fuel gas and an oxidizing gas, the fuel cell system comprising:

an accessory device which is at least one of an actuator and a heater, the actuator being configured to control a fluid relating to operation of the fuel cell system;

a sensor configured to detect an operation state of the fuel cell system;

an accessory device abnormality detector configured to detect an abnormality in the accessory device;

a sensor abnormality detector configured to detect an abnormality in the operation state of the fuel cell system based on an output value from the sensor;

a controller configured to control the operation of the fuel cell system;

a display device configured to display the operation state of the fuel cell system; and

an association determiner configured to determine, when both the accessory device abnormality detector and the sensor abnormality detector have detected the respective abnormalities, an association between the abnormality in the accessory device and the abnormality in the operation state, wherein

the controller performs control such that,

during normal operation of the fuel cell system, the controller

continues the operation of the fuel cell system in the following cases: a case where the accessory device abnormality detector has detected an abnormality and the sensor abnormality detector detects no abnormality; and a case where the accessory device abnormality detector detects no abnormality and the sensor abnormality detector detects no abnormality, and

stops the operation of the fuel cell system in the following cases: a case where the accessory device abnormality detector has detected an abnormality and the sensor abnormality detector has detected an abnormality; and a case where the accessory device abnormality detector detects no abnormality and the sensor abnormality detector has detected an abnormality, and

when the controller is to stop the operation of the fuel cell system in a case where both the accessory device abnormality detector and the sensor abnormality detector have detected the respective abnormalities,

the controller

causes the display device to show a display indicating that both the accessory device and the sensor are in an abnormal state if the association determiner has determined that the abnormalities are associated with each other, and

causes the display device to show a display indicating that only the sensor is in an abnormal state if the association determiner has determined that the abnormalities are not associated with each other.

2 . (canceled)

3 . The fuel cell system according to claim 1 , wherein the controller stores:

a first display code indicating the abnormality in the accessory device, the abnormality being detected by the accessory device abnormality detector; and

a second display code indicating the abnormality in the operation state of the fuel cell system, the abnormality being detected by the sensor abnormality detector, and

the display shown by the display device and indicating that both the accessory device and the sensor are in an abnormal state shows both the first display code and the second display code.

4 . The fuel cell system according to claim 1 , wherein

the controller performs control such that,

during trial operation of the fuel cell system, the controller

continues the operation of the fuel cell system in a case where the accessory device abnormality detector detects no abnormality and the sensor abnormality detector detects no abnormality, and

stops the operation of the fuel cell system in at least one of the following cases: a case where the accessory device abnormality detector has detected an abnormality; and a case where the sensor abnormality detector has detected an abnormality.

5 . A method of operating a fuel cell system including a fuel cell configured to generate electric power by using a fuel gas and an oxidizing gas, the method comprising the steps of:

(A) detecting whether there is occurring an abnormality in an accessory device which is at least one of an actuator and a heater, the actuator being configured to control a fluid relating to operation of the fuel cell system;

(B) detecting, based on an output value from a sensor configured to detect an operation state of the fuel cell system, whether there is occurring an abnormality in the operation state of the fuel cell system;

(C) continuing the operation of the fuel cell system in a case where an abnormality is detected in the step (A) and no abnormality is detected in the step (B) during normal operation of the fuel cell system, and in a case where no abnormality is detected in the step (A) and no abnormality is detected in the step (B) during the normal operation of the fuel cell system;

(D) stopping the operation of the fuel cell system in a case where an abnormality is detected in the step (A) and an abnormality is detected in the step (B) during the normal operation of the fuel cell system, and in a case where no abnormality is detected in the step (A) and an abnormality is detected in the step (B) during the normal operation of the fuel cell system; and

(E) determining, when the respective abnormalities are detected in both the step (A) and the step (B), an association between the abnormality in the accessory device and the abnormality in the operation state;

(F) showing, by a display device, a display indicating that both the accessory device and the sensor are in an abnormal state if it is determined in the step (E) that the abnormalities are associated with each other; and

(G) showing, by the display device, a display indicating that only the sensor is in an abnormal state if it is determined in the step (E) that the abnormalities are not associated with each other.

6 . (canceled)

7 . The method of operating the fuel cell system according to claim 5 , wherein

the display shown by the display device and indicating that both the accessory device and the sensor are in an abnormal state shows both a first display code and a second display code, the first display code indicating the abnormality in the accessory device, the abnormality being detected by the accessory device abnormality detector, the second display code indicating the abnormality in the operation state of the fuel cell system, the abnormality being detected by the sensor abnormality detector.

8 . The method of operating the fuel cell system according to claim 5 , further comprising the steps of:

(H) continuing the operation of the fuel cell system in a case where no abnormality is detected in the step (A) and no abnormality is detected in the step (B) during trial operation of the fuel cell system; and

(I) stopping the operation of the fuel cell system in at least one of

a case where an abnormality is detected in the step (A) during the trial operation of the fuel cell system and

a case where an abnormality is detected in the step (B) during the trial operation of the fuel cell system.

9 . A fuel cell system including a fuel cell configured to generate electric power by using a fuel gas and an oxidizing gas, the fuel cell system comprising:

an accessory device which is at least one of an actuator and a heater, the actuator being configured to control a fluid relating to operation of the fuel cell system;

a sensor configured to detect an operation state of the fuel cell system;

an accessory device abnormality detector configured to detect an abnormality in the accessory device;

a sensor abnormality detector configured to detect an abnormality in the operation state of the fuel cell system based on an output value from the sensor; and

a controller configured to control the operation of the fuel cell system, wherein

the controller performs control such that,

during trial operation of the fuel cell system, the controller

continues the operation of the fuel cell system in a case where the accessory device abnormality detector detects no abnormality and the sensor abnoiniality detector detects no abnormality, and

stops the operation of the fuel cell system in at least one of the following cases: a case where the accessory device abnormality detector has detected an abnormality; and a case where the sensor abnormality detector has detected an abnormality.

10 . A method of operating a fuel cell system including a fuel cell configured to generate electric power by using a fuel gas and an oxidizing gas, the method comprising the steps of:

(A) detecting whether there is occurring an abnormality in an accessory device which is at least one of an actuator and a heater, the actuator being configured to control a fluid relating to operation of the fuel cell system;

(B) detecting, based on an output value from a sensor configured to detect an operation state of the fuel cell system, whether there is occurring an abnormality in the operation state of the fuel cell system;

(C) continuing the operation of the fuel cell system in a case where an abnormality is detected in the step (A) and no abnormality is detected in the step (B) during normal operation of the fuel cell system, and in a case where no abnormality is detected in the step (A) and no abnormality is detected in the step (B) during the normal operation of the fuel cell system;

(D) stopping the operation of the fuel cell system in a case where an abnormality is detected in the step (A) and an abnormality is detected in the step (B) during the normal operation of the fuel cell system, and in a case where no abnormality is detected in the step (A) and an abnormality is detected in the step (B) during the normal operation of the fuel cell system;

(H) continuing the operation of the fuel cell system in a case where no abnormality is detected in the step (A) and no abnormality is detected in the step (B) during trial operation of the fuel cell system; and

(I) stopping the operation of the fuel cell system in at least one of

a case where an abnormality is detected in the step (A) during the trial operation of the fuel cell system and

a case where an abnormality is detected in the step (B) during the trial operation of the fuel cell system.