Honda Motor Co., Ltd.

Toshikazu Kouno

Rico Resch

Mirko Leesch

Soichi Sugino

Kohei Iizuka

Noriaki Saitoh

Jorg Muller

Mariko Shibamura

Shoji Machida

Yuji Yasui

Eijiro Shimabukuro

Junya Tachikawa

An automatic transmission includes an input shaft, an output member, a first planetary gear system, a second planetary gear system, a third planetary gear system, a fourth planetary gear system, and an engagement mechanism. The input shaft is configured to be rotated with power of a driving source relative to the transmission case. The output member is to output rotation of the input shaft using multiple gear-shifting. The multiple gear-shifting is provided by setting at least three of first to third clutches and first to third brakes in a connection state.

Automatic transmission

An automatic transmission includes an input shaft, an output member, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, and an engagement mechanism. Each of a plurality of gear ratios is provided by setting at least three of first to third clutches and first to third brakes in a connection state.

An automatic transmission includes an input shaft, an output member, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, and an engagement mechanism. The engagement mechanism includes first to sixth engagement assemblies. Each of a plurality of gear ratios is provided by setting three of the first to sixth engagement assemblies in a engagement state.

A controller for a transmission capable of preventing an occurrence of a gear squeak caused by a malfunction of a synchronization mechanism. The voltage determination sectionperforms a shift operation of a transmission by determining a control input Vin to a shift motorso as to match an actual position Psc of a coupling sleevegrasped by an actual position grasping sectionwith a target position Psc_cmd of the coupling sleeveset by a target position setting section. After starting the shift operation of the transmission, it halts the shift operation by detecting a malfunction in the gear position where the shift operation is under execution when the actual position Psc of the coupling sleevehas reached a malfunction judgment position provided within a range from a balk point to a contact point between the coupling sleeveand an idle gearbefore a difference Esc between the actual position Psc and the target position Psc_cmd of the coupling sleeveexceeds a given contact judgment value.

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Wako, Japan

Toshikazu Kouno