Toyota Jidosha Kabushiki Kaisha

Aisin Aw Co., Ltd.

Yuuji Kashihara

Kazutoshi Nozaki

Kazuhisa Ozaki

Nobutada Sugiura

Yoshinobu Nozaki

Youichi Hayakawa

Yoji Takanami

Hiroyuki Tsukamoto

Keizo Kobayashi

Akio Murasugi

Koji Nagata

Futomi Hanji

When a shift routine is not being executed in an automatic transmission and a difference between an actual turbine speed and a calculated synchronous speed is equal to, or greater than, a preset value &#x3b1;, a difference &#x394;NT between an estimated turbine speed and the actual speed when the automatic transmission is in a neutral state is calculated. When &#x394;NT is equal to, or less than, a preset value &#x3b2;, it is determined that a failure related to the neutral state of the automatic transmission has occurred. Also, when &#x394;NT is greater than a preset value &#x3b2;, it is determined that a failure related to slipping of a frictional engaging element has occurred.

Apparatus and method for determining a failure in an automatic transmission

Second and third clutches are axially aligned so that the back side of the second clutch and the front side of the third clutch oppose each other, and a first clutch is positioned radially inward of the second and third clutches. Further, a clutch drum is extended so as to be used in common by the second and third clutches, the second clutch is engaged and disengaged from the axial front side by a second piston of a second oil pressure actuator, and the third clutch is engaged and disengaged from the axial rear side by a third piston of a third oil pressure actuator. The first through third clutches are positioned in a compact manner and can be independently operated.

Automatic transmission

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Toyota, Japan

Yuuji Kashihara