Jatco Corporation

Yasuhiko Yuyama

Masahiro Hamano

Hajime Tasaka

An abnormal state diagnosis method for an automatic transmission oil temperature sensor includes: a warm-up judging step of judging whether a sensor value from an engine side temperature sensor in an engine warm-up state indicates the engine warm-up state; a sensor normal operation judgment step of starting to judge whether the engine side temperature sensor including the warm-up judgment result normally performs a temperature detection operation; a provisional judgment step of judging whether an upper or lower deviation width between the sensor value of the engine side temperature sensor and an oil temperature sensor value from an automatic transmission oil temperature sensor is equal to or smaller than a predetermined threshold value; and a final judgment step of determining the judgment result by the provisional judgment step when the automatic transmission control unit receives a permission signal from the engine control module.

Growing community of inventors

Fuji, Japan

Yasuhiko Yuyama