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US 8,308,347 B2Granted
High-pressure tank temperature detection system and high-pressure tank system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorNaoki Kanie
Life of this patent
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Abstract
In a hydrogen tank, discharge of a hydrogen gas may cause lowering of the temperature to a value at which it is assumed that disconnection has occurred in a thermistor. A temperature detection system for the hydrogen tank estimates the possibility that the temperature of the hydrogen tank is below this temperature value, according to the ambient temperature and the internal pressure. Only when there is no possibility that the temperature is below the value, disconnection is judged to have occurred.
Claims10
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.
6 more elements
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 variation amount is evaluated according to a difference between the fluid amount in the high-pressure tank and a reference fluid amount.
4 more elements
Dependencies are inferred from the claim text.