Fuel cell system

Abstract

The fuel cell system includes: a fuel cell stack which is supplied with reaction gas, and performs electricity generation; a reaction gas supplier which supplies the reaction gas to the fuel cell stack; a ground fault detector which detects a ground fault from the fuel cell stack; and a reaction gas increasing member which increases an amount of a reaction gas supply to the fuel cell stack, when the ground fault is detected by the ground fault detector.

1 . A fuel cell system comprising:
 a fuel cell stack which is supplied with reaction gas, and performs electricity generation;   a reaction gas supplier which supplies the reaction gas to the fuel cell stack;   a ground fault detector which detects a ground fault from the fuel cell stack; and   a reaction gas increasing member which increases an amount of a reaction gas supply to the fuel cell stack, when the ground fault is detected by the ground fault detector.   
   
   
       2 . The fuel cell system according to  claim 1 , further comprising:
 a recovery failure status determination member which determines whether the fuel cell stack is in a recovery failure status in which the occurrence of the ground fault is caused by a cause other than an accumulation of generated water, based on a detection result of the ground fault detector, wherein   the recovery failure status determination member determines that the fuel cell stack is in the recovery failure status if, after the amount of the reaction gas is increased by the reaction gas increasing member in a predetermined condition, the occurrence of the ground fault is detected by the ground fault detector.   
   
   
       3 . The fuel cell system according to  claim 1 , further comprising:
 a duration detector which detects a duration of increased reaction gas supply performed by the reaction gas increasing member; and   a recovery failure status determination member which determines whether the fuel cell stack is in a recovery failure status, based on a detection result of the ground fault detector, wherein   the recovery failure status determination member determines that the fuel cell stack is in the recovery failure status, if the ground fault is detected by the ground fault detector, after the duration detected by the duration detector becomes longer than a predetermined amount of time, and cause the reaction gas increasing member to discontinue the increase of the reaction gas supply.   
   
   
       4 . The fuel cell system according to  claim 1 , further comprising:
 a reaction gas amount detector which detects an amount of the reaction gas supply after the reaction gas supply is increased by the reaction gas increasing member; and   a recovery failure status determination member which determines whether the fuel cell stack is in a recovery failure status, based on a detection result of the ground fault detector, wherein   the recovery failure status determination member determines that the fuel cell stack is in the recovery failure status, if, after the amount of the reaction gas supply detected by the reaction gas amount detector exceeds a predetermined amount, the ground fault is detected by the ground fault detector, and cause the reaction gas increasing member to discontinue the increase of the reaction gas supply.   
   
   
       5 . The fuel cell system according to  claim 3 , wherein:
 if the ground fault was resolved after the increase of the reaction gas supply by the reaction gas increasing member, the reaction gas increasing member discontinues the increase of the reaction gas supply.   
   
   
       6 . The fuel cell system according to  claim 4 , wherein:
 if the ground fault was resolved after the increase of the reaction gas supply by the reaction gas increasing member, the reaction gas increasing member discontinues the increase of the reaction gas supply.   
   
   
       7 . The fuel cell system according to  claim 1 , wherein:
 if the ground fault is detected by the ground fault detector, an idling reduction is prohibited.