Patent ID: 7344795

Claim:
A fuel cell system comprising: a fuel cell; a gas supply device for supplying a scavenging gas to the fuel cell; an electronic control unit for controlling scavenging of the fuel cell with the scavenging gas when a request for discontinuing power generation is given to the fuel cell; a humidifying device, which is provided in a passage connecting the gas supply device and the fuel cell, for humidifying the scavenging gas; a humidification control device comprising a first bypass passage bypassing the humidifying device to supply the scavenging gas to the fuel cell and a first bypass valve controlling a flow of the scavenging gas into the first bypass passage; a cooling device, which is provided in the passage, for cooling the scavenging gas; and a cooling control device comprising a second bypass passage bypassing the cooling device to supply the scavenging gas to the fuel cell and a second bypass valve controlling a flow of the scavenging gas into the second bypass passage, wherein the electronic control unit controls the first bypass valve so as to control an amount of the scavenging gas passing through the first bypass passage and into the fuel cell, and wherein the electronic control unit controls the second bypass valve so as to control an amount of scavenging gas passing through the second bypass passage.