Patent ID: 8662115

Claim:
A fuel gas filling system comprising a movable body mounted with a fuel tank; and a fuel gas station which supplies fuel gas to the fuel tank, wherein the fuel gas station includes: a first temperature acquiring unit which acquires information on temperature of the inside of the fuel tank; a second temperature acquiring unit which acquires information on temperature of fuel gas which the fuel gas station supplies to the fuel tank; a calculation unit which calculates based on results acquired by the first temperature acquiring unit and the second temperature acquiring unit after supplying of fuel gas for a predetermined length of time, a difference of temperature between the temperature of the inside of the fuel tank and the temperature of fuel gas supplied to the fuel tank; a determination unit which determines that the information on temperature of the inside of the fuel tank is abnormal when the calculated difference of temperature exceeds a predetermined threshold value; and an operation control unit which, when it is determined that the information on temperature of the inside of the fuel tank is abnormal, reduces at least one of the flow and the amount of fuel gas supplied to the fuel tank as compared to when the information on temperature of the inside of the fuel tank is normal.