Patent ID: 8173315

Claim:
A fuel battery system comprising: a fuel battery to which a reactive gas is supplied to generate power; a pipe which communicates with the fuel battery; a plurality of valves which are disposed in the pipe and which form a plurality of adjoining closed spaces in the pipe; a first pressure sensor which measures a pressure of a first closed space as a gas leakage detection target; a second pressure sensor which measures a pressure of a second closed space adjoining the first closed space on a downstream side; and a control section having a processor, wherein said control section is programmed to detect gas leakage in the first closed space based on a combination of a pressure measurement result of the first pressure sensor and a pressure measurement result of the second pressure sensor in a state in which the pressure of the second closed space is lowered below the pressure of the first closed space, wherein said control section is programmed to judge the gas leakage from a valve of the plurality of valves, the valve disposed between the first closed space and the second closed space, in a case where a pressure reduction value of the first closed space is a predetermined threshold value or more and a pressure rise value of the second closed space is a predetermined threshold value or more, and wherein said control section is programmed to judge the gas leakage from the pipe of the first closed space, in a case where the pressure reduction value of the first closed space is the predetermined threshold value or more, and the pressure rise value of the second closed space is less than the predetermined threshold value.