Nissan Motor Company Limited

Jatco Corporation

Takaaki Matsui

Hiroki Iwasa

Seiichiro Takahashi

Tomoaki Honma

Hironori Miyaishi

Yuta Suzuki

Yoshio Yasui

Masayuki Mannen

Yoshio Morita

Takayuki Nagase

Sunghoon Woo

Susumu Saitou

Control device for continuously variable transmission has continuously variable transmission mechanism (CVT) transmitting power with belt () wound around primary and secondary pulley (); torque convertor () having pump impeller (), turbine runner () and lock-up clutch (); and control unit () controlling lock-up clutch () to predetermined engagement state and controlling the CVT to predetermined transmission ratio, according to travelling condition. Control unit () is configured to, when shifting lock-up clutch () from disengagement to engagement state, control transmission ratio of CVT so that when rotation speed difference (&#x394;N) between engine speed (Ne) and turbine speed (Nt) that is rotation speed of turbine runner is predetermined rotation speed difference (&#x394;N) or less, turbine speed (Nt) approaches engine speed (Ne) more than turbine speed (Nt) of case where control of transmission ratio of CVT, which is set according to travelling condition during shift of lock-up clutch (), is continued.

Control device for continuously variable transmission

A hydraulic pressure control apparatus includes a solenoid valve; a hysteresis hydraulic pressure correction amount calculation section calculating a hysteresis hydraulic pressure correction amount and a command current control section controlling the command current in accordance with the hysteresis hydraulic pressure correction amount. The hysteresis hydraulic pressure correction amount calculation section has, as a reference map, a full hysteresis characteristic, and is configured to make a plurality of reduction maps obtained by reducing the reference map in accordance with a turn-round position at one of minor loops from a past to a present time when the minor loop continues, and to calculate the hysteresis hydraulic pressure correction amount by summation of hysteresis hydraulic pressure correction amounts obtained by the reduction maps in the same command current position.

Hydraulic pressure control apparatus

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Fuji, Japan

Takaaki Matsui