Patent ID: 7767352

Claim:
A method of adjusting the charge amount for an energy storage of a fuel cell system by a control device, said fuel cell system comprising a fuel cell for performing power generation using reactant gases supplied to said fuel cell, an energy storage for assisting the output of said fuel cell, electrical energy from said fuel cell being charged in said energy storage, an air compressor that is driven by electrical energy supplied from said energy storage and that performs a scavenging process for said fuel cell, wherein said control device determines whether the scavenging process is required during power generation by said fuel cell system, the method comprising: a first step of confirming whether the scavenging process is required or not at the time of a power generation stop request; and a second step of charging said energy storage by said fuel cell when the power generation operation is stopped, up to a predetermined normal charge amount in a case where it is determined that the scavenging process is not required at the time of a power generation stop request, and up to a predetermined low temperature charge amount in a case where it is determined that the scavenging process is required at the time of a power generation stop request, said predetermined low temperature charge amount being larger than said predetermined normal charge amount.