Jatco Corporation

Nissan Motor Company Limited

Takahiro Yamada

Toshiaki Noda

Kunihiro Takahashi

Yuji Okamoto

Syunsuke Iwamoto

Yasuhiro Endo

Takashi Koguchi

Akihiro Tanabe

Shohei Imaji

Masayuki Mannen

Takehiro Iizumi

Yuichi Ishiyama

A continuously variable transmission () has a torque convertor () having a lock-up clutch () and a continuously variable transmission mechanism (). A control unit () has a shift control unit (C) configured to be able to perform a pseudo stepwise up-shift control that varies a transmission ratio of the continuously variable transmission mechanism () stepwise, a lock-up control unit (A) configured to control an engagement state of the lock-up clutch (), and a torque control command unit (D) configured to perform a torque-down control of a driving source (). When the engagement control of the lock-up clutch () and the pseudo stepwise up-shift control are performed at the same time, the torque control command unit (D) configured to perform the torque-down control with a greater torque reduction amount.

Device and method for controlling continuously variable transmission

A control device for a lock-up clutch includes a control unit, an abnormality determination unit, a release control unit and a prohibition unit. The control unit is configured to control an engagement state of a lock-up clutch, and to perform a slip lock-up control by performing a feedback control of an engagement hydraulic pressure to be a first slip amount during coasting. The abnormality determination unit is configured to determine an abnormality when a state continues with a slip amount being equal to or greater than a second slip amount. The release control unit is configured to release the lock-up clutch when the abnormality is determined. The prohibition unit is configured to allow the control unit to raise the engagement hydraulic pressure by a prescribed pressure, and to prohibit determination by the abnormality determination unit, when the transmission ratio is downshifted during coasting while the slip lock-up control is performed.

Control device and control method for lock-up clutch

A lockup control device for a vehicle includes: a torque converter, and a lockup control configured to increase a lockup pressure difference command to an initial pressure difference, when a turbine rotation speed variation amount of the torque converter becomes smaller than a predetermined value during a ramp control in which the lockup pressure difference command is increased by a ramp pressure difference, the lockup control section being configured to switch to a second increase gradient having an increase gradient lower than a first increase gradient of the ramp pressure difference when the turbine rotation speed variation amount is equal to or greater than the predetermined value.

Lock-up control device for a vehicle

A lockup control device for a vehicle includes: a torque converter; a lockup control section configured to increase a lockup pressure difference command to an initial pressure difference when a lockup engagement condition is satisfied in a disengagement state of the lockup clutch, and then to increase the lockup pressure difference command by a ramp pressure difference by a predetermined gradient, the lockup control section being configured to determine a ramp start condition by which the lockup pressure difference command is switched from the initial pressure difference to the ramp pressure difference, based on a speed ratio which is a ratio of input and output rotation speeds of the torque converter.

Lock-up control device for vehicle

Growing community of inventors

Ebina, Japan

Takahiro Yamada