Patent ID: 8308347

Claim:
A high-pressure tank temperature detection system comprising: a temperature sensor for detecting a temperature in a high-pressure tank into which a high-pressure fluid is charged; and judgment unit for performing failure judgment of the temperature sensor according to a failure judgment condition, wherein: the failure judgment condition includes a first condition to determine whether or not the failure judgment can be made and a second condition to judge whether or not a failure exists when the failure judgment can be made; and at least the first condition is determined according to a fluid amount or its variation amount in the high-pressure tank, thereby the failure judgment condition is determined according to a fluid amount or its variation amount in the high-pressure tank, wherein the temperature detection system is provided with an estimation unit for estimating a temperature in the high-pressure tank according to a fluid amount or its variation amount in the high-pressure tank independent of the temperature sensor; and the first condition is a condition to determine that the failure judgment can be made when the temperature estimated by the estimation unit is within a range where temperature detection can be made by the temperature sensor, thereby the first condition is determined according to a fluid amount or its variation amount in the high-pressure tank.