Failure detection device and method for oil temperature sensor for automatic transmission
AssigneeToyota Jidosha Kabushiki Kaisha
InventorShinichi Takamura
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Abstract
A failure detection device and method for an oil temperature sensor that detects an oil temperature of hydraulic fluid of an automatic transmission mounted in a vehicle. It is determined that a failure has occurred in the oil temperature sensor if the oil temperature, which is detected by the oil temperature sensor when a predetermined elapsed-time has elapsed since an engine of the vehicle is started, is not within a predetermined temperature range. The predetermined elapsed-time is variably set based on the oil temperature that is obtained when the engine of the vehicle is started.
Claims12
A failure detection device for an oil temperature sensor that detects an oil temperature of hydraulic fluid of an automatic transmission mounted in a vehicle, comprising:
- a determining device that determines that a failure has occurred in the oil temperature sensor if the oil temperature, which is detected by the oil temperature sensor when a predetermined elapsed-time has elapsed since an engine of the vehicle is started, is not within a predetermined temperature range, wherein
- the determining device variably sets the predetermined elapsed-time based on the oil temperature that is obtained when the engine of the vehicle is started.
A failure detection method for an oil temperature sensor that detects an oil temperature of hydraulic fluid of an automatic transmission mounted in a vehicle, comprising:
- determining that a failure has occurred in the oil temperature sensor, if the oil temperature, which is detected by the oil temperature sensor when a predetermined elapsed-time has elapsed since an engine of the vehicle is started, is not within a predetermined temperature range, wherein
- the predetermined elapsed-time is variably set based on the oil temperature that is obtained when the engine of the vehicle is started.
Dependencies are inferred from the claim text.